Identification Information
Citation:
Originator:
Publication Date: 2008
Title:
Open-File Report O-08-01:
Preliminary Geologic Map of the
Publication Information:
Publication
Place:
Publisher: Oregon Department of Geology and Mineral Industries
Description:
Abstract: This data set contains the information used to create the Preliminary Geologic Map of the Spencer Creek 7.5’
Quadrangle for Open-File Report O-08-01. This map is one of a series of geologic maps created for quadrangles in south-
central
The digital raster Graphic (DRG)
of the 1986 provisional edition of the U.S. Geological Survey (USGS) 7.5’
Creek quadrangle provides the base map on top of which have been placed geospatial vector format layers of the geologic
units, unit boundaries/contacts, and faults; and point data format layers of the analyzed rock sample collection locations
and volcanic centers. The geologic units and their boundaries were determined based on a combination of observations
from the field and of hand-sample, thin-section, and geochemical analyses of 184 samples collected from within the
Spencer Creek USGS 7.5’ quadrangle as well as of relevant samples collected from adjacent USGS 7.5’ quadrangles.
Although the chemistry data and thin-section observations were used in creating the map, the units are meant to be field-
mappable, that is, recognizable by the study of outcrops in the field.
The various layers (geologic units, samples, etc.) of the map were digitized in MapInfo Professional v.7.0 from drawings
on paper quadrangles, UTM coordinates, or maps from student research reports. Rock samples were collected and
analyzed by x-ray fluorescence (XRF) intermittently between 1992 and 2007. Several samples were also dated using
K-Ar or 40Ar/39Ar dating methods. The major and trace elemental chemistry data and ages are made available in the
samples table of this data set.
Purpose: These data were collected and compiled in order to better understand the local geology and geologic history, to create
a field-mappable
geologic map of the
File Report O-08-01, and to make available the collected chemical and age information that may be useful in various forms
of study of this volcanic region. The map is intended for a diverse audience with varying amounts of geologic
understanding.
This is one of a series of geologic maps of USGS 7.5’ quadrangles in the
south-central region of
to be published by the Oregon Department of Geology and Mineral Industries.
Supplemental Information: There are several different files and file formats in this data set. The geologic units table, unit
boundaries/contacts table, samples table, faults table, and volcanic centers table were created in MapInfo Professional
version 7.0 and the .TAB files can be opened using MapInfo software. These data were later translated to ESRI
compatible file formats using the MapInfo Universal Translator extension. These translated files were then arranged
and setup to properly display the data when opened in the ESRI ArcMap software.
There is a MapInfo workspace (.WOR) file that opens the georeferenced USGS Spencer Creek 7.5’ quadrangle raster
image and the other
file (.MXD) which contains the georeferenced USGS Spencer Creek 7.5’ quadrangle and the geologic units, unit
boundaries, samples, faults, and volcanic centers shapefiles and accompanying attribute tables.
Time Period of Content:
Multiple Dates/Times:
Calendar Date: 1992, 1995, 1997, 1998, 1999, 2000, 2004, 2006, 2007, 2008
Currentness Reference: ground condition and 2008 is the publication date
Status:
Progress: Complete
Maintenance and Update Frequency: Unknown
Spatial Domain:
Bounding Coordinates:
West Bounding Coordinate: -122.125
East Bounding Coordinate: -122.00
North Bounding Coordinate: 42.25
South Bounding Coordinate: 42.125
Keywords:
Theme:
Theme Keyword Thesaurus: none
Theme Keyword: geologic map
Theme Keyword: map of surface geology
Theme Keyword: surface geology
Theme Keyword: volcanoes
Theme
Keyword:
Theme Keyword: volcanic flows
Theme Keyword: lava flows
Theme Keyword: units
Theme Keyword: formations
Theme Keyword: formation boundary
Theme Keyword: contact
Theme Keyword: samples
Theme Keyword: rock samples
Theme Keyword: geochemistry
Theme Keyword: chemistry
Theme Keyword: age-dated
Theme Keyword: volcanic center
Theme Keyword: fault
Theme Keyword: geospatial vector format
Theme Keyword: digital raster graphic
Theme Keyword: drg
Theme Keyword: topographic map
Theme Keyword: topographic quadrangle
Theme Keyword: USGS quadrangle
Theme Keyword: Open-File Report
Theme Keyword: Open-File Report 08-01
Place:
Place Keyword Thesaurus: none
Place
Keyword:
Place
Keyword: south-central
Place
Keyword:
Place
Keyword:
Place
Keyword:
Place
Keyword:
Place
Keyword:
Place
Keyword:
Place
Keyword:
Place Keyword: John C. Boyle Reservoir
Place
Keyword:
Place
Keyword: Clover
Place
Keyword:
Place Keyword: Grub Spring Reservoir
Place Keyword: Roma
Place Keyword: Clover Creek
Place Keyword: Cascades
Place
Keyword:
Place Keyword: High Cascade volcanoes
Place
Keyword:
Stratum:
Stratum Keyword Thesaurus: none
Stratum Keyword: surface
Stratum Keyword: surface geology
Stratum Keyword: surficial
Stratum Keyword: surficial formations
Stratum Keyword: surface formations
Stratum Keyword: upper strata
Stratum Keyword: surface strata
Stratum Keyword: volcanic strata
Stratum Keyword: volcanic
Stratum Keyword: surficial volcanic deposits
Stratum Keyword: lava flows
Stratum Keyword: surficial lava flow
Stratum Keyword: Quaternary sediments
Temporal:
Temporal Keyword Thesaurus: none
Temporal Keyword: 3.9 Ma
Temporal Keyword: 3.9 million years
Temporal Keyword: present
Temporal Keyword: 3.9 million years ago to the present
Temporal Keyword: late Cenozoic
Temporal Keyword: upper Cenozoic
Temporal Keyword: Quaternary
Temporal Keyword: 5.332 Ma
Temporal Keyword: 5.332 million years
Temporal Keyword: Less than 5.332 million years
Temporal Keyword: 5.332 million years ago to the present
Temporal Keyword: Lower Pliocene to Holocene
Temporal Keyword: Pliocene to Holocene
Temporal Keyword: Early Pliocene to Holocene
Temporal Keyword: Pliocene
Temporal Keyword: Holocene
Temporal Keyword: Pleistocene
Access Constraints: none
Use Constraints: Acknowledgement of the author and the Oregon Department of Geology and Mineral Industries would be
appreciated in products derived from these data.
Point of Contact:
Contact
Person Primary:
Contact Address:
Address Type: mailing and physical address
Address:
City:
State or
Province:
Postal Code: 17604
Contact Voice Telephone: 1-717-291-3818
Contact Electronic Mail Address: stan.mertzman@fandm.edu
Contact Instructions: contact via electronic mail is preferred
Browse Graphic:
Browse Graphic File Name: O-08-01Map30x36.pdf
Browse Graphic File Description: The O-08-01Map30x36.pdf file contains the Preliminary Geologic Map of the Spencer
Creek 7.5’ Quadrangle of Open-File Report O-08-01. This map was made from the data provided in this data set. The
basic image in this map (the 1986 USGS Spencer Creek 7.5’ quadrangle overlain by the formations, formation
boundaries/contacts, sample symbols, and the faults) was created in MapInfo Professional version 7.0 using the data
available in this data set (SpencerCreekQuadforTransparent.TAB, SpencerCreekUnits.TAB,
SpencerCreekUnitBounds.TAB, SpencerCreekFaults.TAB, and SpencerCreekSamples.TAB). This image was exported
from MapInfo Professional v. 7.0 as a Photoshop Document (.PSD) at a zoom of 1 inch = 1.4 miles, a window size of
7.99 miles (in the export options, the actual window size was doubled from 5.72 inches to 11.44 inches), and with a
resolution of 600 pixels per inch. The colors of the resulting .PSD file were adjusted in Adobe Photoshop CS3 to
match USGS CMYK color standards. The image was then opened in Adobe Illustrator CS3 where its size was
increased by 184.7999% to make the map scale 1:24,000. The samples’ map numbers, the formation labels, and the rest
of what is seen on the map, such as the time rock chart and the legend, were added to the map in Adobe Illustrator CS3.
The resulting 30 inch x 36 inch Adobe Illustrator image was saved as a Portable Document Format (.PDF) file and the
result is the image of the geologic map seen in the file O-08-01Map30x36.pdf.
Browse Graphic File Type: PDF
Native Data Set Environment: The majority of the data files in the data set used to make the Preliminary Geologic Map of the Spencer
Creek 7.5’ Quadrangle of Open-File Report 08-01 were originally created using MapInfo Professional software version 7.0
running under a Microsoft Windows 2000 Professional operating system. The data that were digitized in this environment were
the geologic formations, the formations boundaries, the sample locations, the faults, and the volcanic centers layers. These files
were modified using MapInfo Professional software version 7.0 running under a Microsoft Windows XP Professional version
2002 Service Pack
2 operating system. The USGS 7.5’
an external source and was produced in a different environment. However, in order to make a version of this USGS quadrangle
drg that would make its white and green areas transparent (so that the map could overlay the formations layer and the
formations could show through) the digital USGS quadrangle drg was modified from the state in which it was originally
obtained. This modification was done using Adobe Photoshop version 5 and the resulting image of the quadrangle was
manually georeferenced in MapInfo Professional version 7.0. The data were at times accessed and modified in MapInfo
Professional version
7.0 running under a Microsoft XP operating system. The data from the
table have been exported from MapInfo Professional version 7.0 at least one time and opened in Microsoft Excel for addition
or modification of certain attributes, particularly chemistry data. The Microsoft Excel file was then reopened in MapInfo
Professional version 7.0. The files of this data set have been saved and backed-up on various hard drives at various times. The
most up-to-date
MapInfo Professional formatted files (
48.3 MB.
After the data set had been produced in MapInfo Professional version 7.0, the files were converted using MapInfo’s Universal
Translator extension to produce files that could be opened with ESRI ArcMap software version 9.2. This was done by converting
the MapInfo TAB files into ESRI SHP format files. The USGS quadrangle drg was reopened and georeferenced anew within
ESRI ArcMap. Further modification of the data files occurred within ESRI ArcMap, such as adjustment of attribute names in the
attribute table, adjustment of symbol shapes and colors, and setting of the formation regions’ colors to make these features similar
to how they appear in the MapInfo Files and on the Open-File Report geologic maps. The ESRI-formatted files (MXD, DBF,
PRJ, SBN, SBX, SHP, SHX, AUX, RRD, TFW, TIF, TFWX, and XML) have a total size of 117 MB.
Data Quality Information
Attribute Accuracy:
Attribute Accuracy Report: The attribute accuracy was tested in several ways. For sample, unit boundary, and volcanic center
location attributes (UTM coordinates), accuracy was assessed by comparison of on-screen representations of the location
(digital maps on the computer screen) to hard copy versions (hand-drawn or similarly-demarcated locations and
boundaries on top of paper USGS quadrangles). On several occasions, the digitized versions of the Spencer Creek 7.5’
quadrangle were printed out on paper with the symbol locations and formation boundaries demarcated. The print-out
was then assessed
by the chief geologist of the project,
The UTM coordinates of the samples provided in the attribute table have a precision that does not reflect that with which
their locations on the map were determined. The precision reflects the values that were assigned using MapInfo
Professional version 7.0’s Coordinate Extractor extension after manual placement (digitization) of the sample locations
on the drg of the USGS 7.5’
locations were drawn, or in some cases, based on previously-rounded (to the nearest 10 m) UTM coordinates for samples
not shown on the original paper map(s). The accuracy of the locations drawn on the original paper maps may vary. Prior to
the year 2000, sampling locations were originally determined by use of a Brunton compass in the field and these data
were later translated to the 1:24,000 USGS 7.5’ quadrangles using plastic overlay cards marked with 1:24000 scale UTM
coordinate grids or tick marks at relevant, repeated intervals. After the year 2000, Magellan GPS units were used in the
field to determine a sample’s collection location, and again these coordinates were placed on the 1:24,000 scale USGS
quadrangles using the appropriate plastic overlay card with UTM units.
The Public Land Survey System (PLSS) attributes (¼ of ¼ Section, ¼ Section, Section, Township, and Range) in the
accuracy beyond the checks that occurred during their production. The Township and Range attribute values were
assigned by selection of all samples that occurred within either manually created or downloaded polygons of the
Township and Range boundaries. Samples near a Township or Range grid line were more carefully studied on the screen
to check that the sample really did lie within the supposed Township. The Section attribute was assigned based on a
sample’s location in relation to
the PLSS section grid as represented on the drg of the
MapInfo (the sections are the small quadrangles demarcated by dashed red lines with the section numbers in their
centers (where possible)).
The ¼ of ¼ Section and ¼ Section attributes were assigned for each sample based on downloaded grids which displayed
the boundaries of the ¼ of ¼ Sections and ¼ Sections of Townships. Because the Section and Township boundaries did
not always line up perfectly with those of the underlying quadrangle DRG, at times attributes of samples close to lines in
this grid had to be assigned based on mental adjustments or at times, the use of a ruler held up to the screen, by a
technician. For this reason, the accuracy of the ¼ of ¼ Section and ¼ Section attributes may be questionable in some cases,
particularly in those samples which lie close to the boundaries which demarcate these location descriptors.
The accuracy of a sample’s Unit attribute was tested by a visual check of the sample’s location in relation to the unit
boundaries as displayed in MapInfo Professional version 7.0 and by analysis of the chemical data.
The accuracy of the chemical data is dependent on many factors not discussed here. The samples were analyzed by x-ray
fluorescence (XRF) at various times and possibly by different machines. All that will be said is that the accuracy of the
XRF chemical data is monitored and assessed during the measurement procedure by using an instrument monitor (to
account for local climate and machine conditions on the day of measurement), by running several well-measured
standards in every batch, and by analyzing the totals counts. That the chemical attributes of each sample in the data table
match the originally assigned data from the XRF instrument was tested by the comparison of the sample chemistry table
to the original Excel data files that contained the chemistry information provided by the XRF spectrometer. All of the
chemical data were derived from these original Excel files, except for those of several of the age-dated samples, which
may have values copied from a previous publication by Stanley A. Mertzman (2000). That the chemistry of the dated
samples was correctly copied into the data table was checked by comparison of the digital data to the data printed in
the publication.
The colors of the units are consistent between adjacent quadrangles mapped in this project and were created as the
RGB (only color mode allowed in MapInfo Professional version 7.0) equivalents of standard USGS CMYK colors.
Logical Consistency Report: The
boundaries of the
checked for self- intersections, overlaps, and gaps using MapInfo Professional version 7.0 and no self-intersections or gap
problems were detected. Two overlaps were detected, but do not appear to actually exist when checked manually. The reason
for the detection of these errors cannot be currently explained. The edges of unit polygons have also been checked against
those mapped in
adjacent USGS 7.5’ quadrangles as part of this project, but available in other
data sets (
north,
points at the quadrangle corners were found to align perfectly (including those of units in Lake of the Woods South quadrangle
to the northwest and Mule Hill quadrangle to the southwest). The boundaries of the units that continue on the Keno 7.5 minute
quadrangle to the east were compared with those on a map published by Hladky and Mertzman (2002) and were adjusted to fit
where appropriate.
In places the boundaries and units present on the Keno and
perfectly due to new information available and differing interpretations of the geology. The unit boundaries polylines (from the
file SpencerCreekUnitBounds) were drawn in a separate layer on top of the formations layer using the trace function that is
available in the MapInfo Professional version 7.0 software.
There are four pairs of samples
with duplicate coordinates in the
to the collection of more than one sample from the same location or possibly from multiple XRF analyses of different parts of
the same sample.
Completeness Report: All field-mappable units and unit boundaries
in the USGS 7.5’
At least one sample (not necessarily within the USGS Spencer Creek 7.5’ quadrangle) from each unit present in the quadrangle,
except Qal, Qs,
and Qg, has been age-dated. All known faults and volcanic centers within the
been mapped and the layers containing these features have been included in this data set. All samples known to have been
collected within this quadrangle and analyzed by x-ray fluorescence (XRF) by Professor Stanley A. Mertzman or a lab
technician. All chemistry results from the XRF analyses have been included in the attribute table of the samples data file
(SpencerCreekSamples). All map numbers, sample numbers, ages (applicable only to dated samples) in millions of years (Ma),
Public Land Survey
System (PLSS: ¼ of ¼ Section, ¼ Section, Section, Township, and Range according
to the
meridian and base line), UTM coordinates (North American Datum of 1927: Zone 10), unit membership, and lithology (based
on the total alkalis versus silica (TAS) classification method for volcanic rocks described by Le Maitre (2002)) have been
included in the attribute table of the samples data file. The unit’s symbol, name, geologic time scale age, and radiometrically-
determined age(s)
are the attributes of the
indicate whether thefault’s location is approximate or concealed and inferred (Appr_or_Conc); describe what kind of fault it
is (Type_of_Fault); and indicate the relative direction of the hanging-wall / down-dropped block to the fault (Notes). The
attributes of the volcanic centers table provide their UTM Easting and Northing locations (UTM_E_m and UTM_N_m) as
determined using MapInfo Professional v. 7.0 (NAD 27: Zone 10).
Positional Accuracy:
Horizontal Positional Accuracy:
Horizontal Positional Accuracy Report: The horizontal positional accuracy of the digitized data with regard to the
original paper maps has been checked by visual comparison of the digitized sample locations, formation
boundaries, and volcanic centers to the original paper maps when possible. The positional accuracy of the original
sample locations on the original paper maps may vary depending on the location-determining methods used as
discussed above (Brunton compass or Magellan GPS after the year 2000). The positions of the unit boundaries
are approximate and their accuracy has not necessarily been field tested. Analysis of the collected samples
(chemistry, hand-sample, and thin sections) and familiarity with the area from lots of time spent in the field by
experienced geologists ought to ensure reasonable accuracy of the mapped unit boundaries, although this is not
quantifiable. The locations of the faults covered by Quaternary sediments were inferred and their positional
accuracy has not been tested.
Lineage:
Source Information:
Source Citation:
Originator:
Publication Date: 1986
Title:
Edition: Provisional Edition 1986
Geospatial Data Presentation Form: map and raster digital data (digital raster graphic (drg)) of map
Series Information:
Series Name:
Series Issue:
(Note: the version of the Spencer Creek 7.5 minute quadrangle drg used in this dataset reads
“12242-B1-TF-024.” The naming pattern according to the Ohio Code convention used by the
USGS would indicate that this is a typographical error and that the name and number provided
above are correct.
Publication Information:
Publication
Place:
Publisher:
Other Citation Details: A drg of this map can be downloaded from the
Online Linkage: UO Libraries website:
http://libweb.uoregon.edu/dc/24k_lookup/displaymap.php?ohio_code=42122b1
Source Scale Denominator: 24,000
Type of Source Media: Paper and Online
Source Time Period of Content:
Time Period Information:
Multiple Dates/Times:
Calendar Dates: 1980, 1981, 1986
Source Currentness Reference: 1980 corresponds to the year in which aerial photographs were taken; the map
was field checked in 1981; and the map was edited and published in 1986. The year of production of
the particular drg used in the data set is not currently known.
Source Citation Abbreviation: 42122b1
Source Contribution: The USGS Spencer Creek 7.5 minute paper quadrangle was used as the base map on
which the geology of the quadrangle was mapped by Stanley A. Mertzman, his colleagues, and
students (the exact version(s) of the map(s) used as the original base maps is not currently known). A
downloaded drg of the Spencer Creek 7.5 minute quadrangle (42122b1) was used as the base map for
this data set onto which the sample locations, units, some of the faults, and volcanic centers were copied
(digitized) from a paper version (or versions) of the map(s) produced by the geologists involved in this
project. It is also possible that the sample collection locations came from UTM coordinates provided in a
report by one of the geologists. Some of the faults’ locations were inferred based on the topography and
the location of faults on adjacent quadrangles and they were created in MapInfo on top of the Spencer
Creek 7.5’ quadrangle drg without copying from a paper version of the quadrangle.
Process Step:
Process Description: The first step in the production of this data set was the collection of rock samples and observations
from the field. The samples’ chemistries were determined by x-ray fluorescence (XRF) spectroscopy (see
http://fandm.edu/x7985.xml for an overview of the XRF spectroscopy preparation and analysis procedure). The
hand-samples were carefully analyzed and described. Thin sections of the rocks allowed further description of
certain samples by analysis with a petrographic microscope. A sample’s collection location was determined in
the field using a Brunton compass prior to 2000, and with a Magellan GPS unit after 2000. The sample locations
were marked on paper versions of
the USGS 7.5’
using a georeferenced (to the North American Datum of 1927 (NAD 27) zone 10 horizontal datum) drg of the
quadrangle in MapInfo Professional version 7.0 by placing a point (node) in a layer above the drg at the location
identical to the sample’s location on the paper map. If a sample was not present on a map, but the UTM
coordinates of its collection location were known, these coordinate values were used to plot the sample’s
collection location in MapInfo.
This process was the first step in the production of the
table (SpencerCreekSamples); it produced point data from which the UTM coordinates, if not already known,
could be extracted to the attribute table. Please note that the precision of the UTM coordinates does not
necessarily reflect the precision with which they were originally obtained, but represents the precision obtained
when extracting the coordinates of the points (with MapInfo Professional version 7.0’s coordinate extractor tool)
after they were digitized from the paper maps.
The SpencerCreekSamples attribute table was exported at least one time to Microsoft Excel, where other sample
attributes were added and or modified (such as lithology and chemistry data). These Excel spreadsheets were
then imported back into MapInfo Professional version 7.0 and the previously extracted UTM coordinates were
used to re-plot the sample locations over the 7.5’ quadrangle drg. The drg of the quadrangle was also used in
assigning some of the Township, Range, and Section attributes to the samples. Downloaded PLSS grids also
aided in assigning these and other PLSS attributes (¼ of ¼ section, ¼ section) to the samples table.
The combination of the analyses of collected samples and a familiarity with the area from a lot of time spent in
the field allowed Stanley A. Mertzman to determine and discriminate between the units present within the
Spencer Creek 7.5’ quadrangle and to draw the approximate locations of their boundaries on the paper USGS
7.5’ topographic maps. These boundaries were then digitized in the same manner as sample locations, by copying
their locations from on the paper
map to a MapInfo layer on top of a drg of the same map (USGS 7.5’
Creek quadrangle/ 42122b1). This was done using the polygon tool in MapInfo Professional version 7.0. The
boundary of the unit on the map (contact) (SpencerCreekUnitBounds MapInfo Table) was digitized as the
boundary of the polygon in MapInfo. The unit polygons were colored based on RGB equivalents of standard
USGS CMYK colors. The unit ages, names, and symbols (abbreviated names) were added to the attribute table
at a later stage of the process. It was decided that a separate layer (file) should be made for the unit boundaries
(contacts) within the quadrangle because the edges of the unit polygons did not necessarily correspond to the
actual unit boundaries. The edges of the unit polygons were limited by the quadrangle boundaries, so although
many units extend beyond the boundaries of the Spencer Creek USGS 7.5’ quadrangle, the polygons for this
data set were limited to the area of the quadrangle.
In order to make a layer (SpencerCreekUnitBounds) that corresponded to the actual unit boundaries (ground-
surface contacts between two rock units), the true unit boundaries (not those cut off at the quadrangle’s edges)
were made by tracing (using MapInfo’s trace function) all of the unit polygons’ edges, except those that
corresponded with the 4 sides of the quadrangle. This process created the polylines that now represent the unit
boundaries/contacts in this data set (SpencerCreekUnitBoundaries).
The volcanic centers’ locations were originally determined from field observations and sample analyses. Their
locations were marked on a paper version of the quadrangle with temporary stickers and then digitized by
copying the location to the identical spot on the drg of the quadrangle. The UTM coordinates of these
locations have been extracted into the volcanic centers attribute table using MapInfo version 7.0’s Coordinate
Extractor tool. Please note that, like the precision of the samples' UTM coordinates, the precision of the volcanic
centers UTM coordinates does not reflect that with which the location was determined, but is the result of using
MapInfo v. 7.0's Coordinate Extractor Extension.
The faults’ locations were primarily determined based on field observations, but in certain locations were inferred
based on the local topography and geology combined with the consideration of the location of faults that went
to the edges of adjacent 7.5 minute USGS quadrangles.
After the creation of final forms of all of the necessary files in MapInfo, the MapInfo Universal Translator
Extension was used to convert the MapInfo-formatted data set to ESRI-format files. This involved converting
the mapinfo TAB files of the unit polygons, unit boundary (contact) polylines, sample points, fault polylines,
and volcanic center points to shapefiles (SHPs). These files were opened and adjusted in ESRI ArcMap
version 9.2. It should be noted that two additional fields (attributes) were created when the MapInfo TAB files
were converted to ESRI-format files. These two fields are the “FID” and the “Shape*.” The “FID” numbers all
of the objects in the data tables and the “Shape*” attribute tells what kind of data an object is (multipoint,
polyline, polygon). These added fields are not discussed with the rest of the attributes below. It should also be
noted that certain attribute names of the ESRI-format files were changed by the program during their creation
and were not able to be modified by the technician. In such cases, the alias of the attribute was changed to fit
the original attribute titles (as shown below), but the names had to be left as they were converted.
The digital versions of the sample collection locations; units and unit boundaries; and the volcanic centers
locations were checked by visual comparison of the digital data on the computer screen (in MapInfo) or on
printed copies to the original source paper maps. Furthermore, final printed or digital (PDF) versions of the
resulting maps were assessed by the chief geologist of this project, Stanley A. Mertzman.
Source Used Citation Abbreviation: 42122b1
Process Date: 2008
Process Contact:
Contact Information:
Contact Person Primary:
Contact Person: Isaac Weaver
Contact Position: Research Assistant
Contact Address:
Address Type: mailing and physical address
Address: Isaac Weaver,
City:
State or
Province:
Postal Code: 17604
Contact Voice Telephone: Unavailable
Contact Electronic Mail Address:
Indirect Spatial Reference: This data set contains the drg of the USGS
7.5’
locations at which rock samples were collected from outcrops, polygons of the geologic units, polylines of the unit boundaries
(contacts),
polylines of faults, and point data volcanic center locations for the U.S.
Geological Survey 7.5 minute
Creek quadrangle.
Direct Spatial Reference Method: Point, Vector, and Raster
Horizontal Coordinate System Definition:
Planar:
Grid Coordinate System:
Grid Coordinate System Name: Universal Transverse Mercator
Universal Transverse Mercator:
UTM Zone Number: 10
Transverse Mercator:
Scale
Factor at
Longitude
of
Latitude of Projection Origin: 0.000000
False Easting: 500000.000000
False Northing: 0.000000
Planar Coordinate Information:
Planar Coordinate Encoding Method: coordinate pair
Coordinate Representaion:
Abscissa Resolution: 0.01
Ordinate Resolution: 0.01
Planar Distance Units: meters
Geodetic Model:
Horizontal Datum Name: North American Datum of 1927
Ellipsoid Name: Clarke 1866
Semi-major Axis: 6378206.4
Denominator of Flattening Ratio: 294.9787
Detailed Description:
Entity Type:
Entity Type Label: Unit
Entity Type Definition: A rock unit (or just unit), with regard to this data set, is a body of rock with a limited range of
lithological characteristics (as determined by analyses of outcrops and samples in the field and in the laboratory)
that can be distinguished from other bodies of rocks by observations made in the field (such as analysis of
outcrops or hand-samples collected from them). That is to say, a unit is field-mappable according to the
definition used in the creation of this data set. Nevertheless, the chemistry data and other observations not
possible in the
field were still considered in determining and discriminating the units. In the
quadrangle, a unit may represent one or more volcanic flows, vent deposits, quaternary alluvium and/or
colluvium, or quaternary lacustrine deposits. A unit has an age (or age-range), which has been determined by
radiometric dating of collected samples (except for Quaternary sediments). It should be noted that the vent
deposit units (Qbv, Tbv) may all display similar macroscopic lithologies, but are perhaps best described as sub-
units of the units in which they are found. Therefore, samples collected from these deposits are considered a part
of the unit in
which the vent deposits are found. There is one exception to this statement on
the
7.5’ quadrangle;
the southernmost area of Qbv on this map (adjacent to and to the west of the
to the east of an area of Tpbps) is not found within or adjacent to an area of Qbbl, the unit to which it and the
samples collected therein belong.
Detailed descriptions of the units
found within the USGS 7.5’
File Report O-08-01 (Mertzman (2008)). In this data set, the units are colored polygons with edges placed at the
approximate locations of the contacts, except when limited by the quadrangle boundaries.
Entity Type Definition Source: See Mertzman (2008) for detailed descriptions of the units found within the Spencer
Creek quadrangle.
Attribute:
Attribute Label: Symbol
Attribute Definition: The symbol is a form of shorthand text, specific to a unit, that is created by combining age and
lithology information with an abbreviated form of the unit’s name. The symbol attribute is meant to be displayed
on the pdf versions of the geologic map to save space while identifying the unit, or it can be displayed when
viewing the data in MapInfo or ArcMap on a computer. It is intended that the symbol convey age, lithology, and
unit name information. The first letter is capitalized and represents the period-age of the formation (T=Tertiary
and Q=Quaternary). If the first letter of the symbol is a capital T, then the second letter represents the epoch-age
of the formation (p=Pliocene and m=Miocene). It should be noted that these first two letters only represent the
oldest dated age of the formation. Therefore, a unit’s age may span from period to period or epoch to epoch, but
this cannot be discerned from the symbol. The remaining letters in the symbol indicate the lithology of the
formation and its name. The lithology (for volcanic units, b=basalt and ba= basaltic andesite) comes first after
the age information in the abbreviation of the unit’s name, which is usually based on an outstanding geographic
or topographic feature present in the area of the unit. The vent deposits and the Quaternary sedimentary units do
not follow this pattern, are treated more generally, and only have the age information followed by a general
lithology abbreviation because these units and sub-units (vent deposits) do not have specific names based on a
geographic feature.
Attribute Definition Source: None
Attribute Domain Values:
Enumerated Domain:
Enumerated Domain Value: Qal
Enumerated Domain Value Definition: Alluvium (Holocene).
Enumerated Domain Value Definition Source: Open-File Report O-08-01 (Mertzman (2008)).
Enumerated Domain:
Enumerated Domain Value: Qg
Enumerated Domain Value Definition: Undifferentiated colluvium and alluvium (Holocene and
Pleistocene).
Enumerated Domain Value Definition Source: Open-File Report O-08-01 (Mertzman ( 2008)).
Enumerated Domain:
Enumerated Domain Value: Qs
Enumerated Domain Value Definition: Lacustrine deposits (Holocene and Pleistocene).
Enumerated Domain Value Definition Source: Open-File Report O-08-01 (Mertzman ( 2008))
Enumerated Domain:
Enumerated Domain Value: Qbv
Enumerated Domain Value Definition: Basaltic to basaltic andesite vent deposits (Pleistocene). This unit
should be considered a sub-unit of the unit in which it is found (except the southernmost area of
Qbv on the Spencer Creek 7.5’ quadrangle, which is not found within or even adjacent to the unit
of which it is part, Qbbl). Qbv is present in several different units. The Qbv found in one unit
may appear very similar to the Qbv in another unit in terms of macroscopic lithological properties,
but they differ chemically and/or in the lithologies of their more slowly cooled equivalents (the
lava that flowed from the vent and solidified as the surrounding unit).
Enumerated Domain Value Definition Source: Open-File Report O-08-01 (Mertzman (2008)).
Enumerated Domain:
Enumerated Domain Value: Tbv
Enumerated Domain Value Definition: Basaltic to basaltic andesite vent deposits (Pliocene). This unit
should be considered a sub-unit of the unit in which it is found. There is only one area of Tbv
found within the
USGS 7.5’
are considered part of the Tpbps unit.
Enumerated Domain Value Definition Source: Open-File Report O-08-01 (Mertzman (2008))
Enumerated Domain:
Enumerated Domain Value: Qbrl
Enumerated
Domain Value Definition: Basalt of
Enumerated Domain Value Definition Source: Open-File Report O-08-01 (Mertzman (2008)).
Enumerated Domain:
Enumerated Domain Value: Qbaa
Enumerated
Domain Value Definition: Basaltic
Andesite of Aspen
Pleistocene).
Enumerated Domain Value Definition Source: Open-File Report O-08-01 (Mertzman (2008)).
Enumerated Domain:
Enumerated Domain Value: Qbac
Enumerated
Domain Value Definition: Basaltic
Andesite of Clover
Enumerated Domain Value Definition Source: Open-File Report O-08-01 (Mertzman (2008)).
Enumerated Domain:
Enumerated Domain Value: Qbbp
Enumerated
Domain Value Definition: Basalt of
Enumerated Domain Value Definition Source: Open-File Report O-08-01 (Mertzman (2008)).
Enumerated Domain:
Enumerated Domain Value: Qbar
Enumerated Domain Value Definition: Basaltic Andesite of Roma (Lower Pleistocene).
Enumerated Domain Value Definition Source: Open-File Report O-08-01 (Mertzman (2008)).
Enumerated Domain:
Enumerated Domain Value: Qbbl
Enumerated
Domain Value Definition: Basalt of
Enumerated Domain Value Definition Source: Open-File Report O-08-01 (Mertzman (2008)).
Enumerated Domain:
Enumerated Domain Value: Qbsc
Enumerated
Domain Value Definition: Basalt of
Enumerated Domain Value Definition Source: Open-File Report O-08-01 (Mertzman (2008)).
Enumerated Domain:
Enumerated Domain Value: Tpbas
Enumerated
Domain Value Definition: Basaltic
Andesite of
Lower Pleistocene).
Enumerated Domain Value Definition Source: Open-File Report O-08-01 (Mertzman (2008)).
Enumerated Domain:
Enumerated Domain Value: Tpbke
Enumerated Domain Value Definition: Basalt of Keno (Upper Pliocene to Lower Pleistocene).
Enumerated Domain Value Definition Source: Open-File Report O-08-01 (Mertzman (2008)).
Enumerated Domain:
Enumerated Domain Value: Tpbtr
Enumerated Domain Value Definition: Basalt of Tom Reservoir (Upper Pliocene).
Enumerated Domain Value Definition Source: Open-File Report O-08-01 (Mertzman (2008)).
Enumerated Domain:
Enumerated Domain Value: Tpbacm
Enumerated
Domain Value Definition: Basaltic
Andesite of
Enumerated Domain Value Definition Source: Open-File Report O-08-01 (Mertzman (2008)).
Enumerated Domain:
Enumerated Domain Value: Tpbps
Enumerated
Domain Value Definition: Basalt of
Enumerated Domain Value Definition Source: Open-File Report O-08-01 (Mertzman (2008)).
Enumerated Domain:
Enumerated Domain Value: Tpbab
Enumerated Domain Value
Definition: Basaltic Andesite of
Enumerated Domain Value Definition Source: Open-File Report O-08-01 (Mertzman (2008)).
Enumerated Domain:
Enumerated Domain Value: Tpbak
Enumerated
Domain Value Definition: Basaltic
Andesite of
Enumerated Domain Value Definition Source: Open-File Report O-08-01 (Mertzman (2008)).
Enumerated Domain:
Enumerated Domain Value: Tpbac
Enumerated Domain Value Definition: Basaltic Andesite of Camp Creek (Lower to Middle Pliocene).
Enumerated Domain Value Definition Source: Open-File Report O-08-01 (Mertzman (2008)).
Attribute:
Attribute Label: Name
Attribute Definition: The Name attribute represents the name of the unit of which the entity is a part. The name
combines information on the lithology of the unit with a geographic feature located within or near the unit’s
boundary, such as a mountain, a body of water, or a town/city. Detailed descriptions of the units found within
the Spencer Creek USGS 7.5’ quadrangle are available in Open-File Report O-08-01 (Mertzman (2008)).
Attribute Definition Source: See Mertzman (2008)
Attribute Domain Values:
Enumerated Domain:
Enumerated Domain Value: Alluvium
Enumerated Domain Value Definition: Unconsolidated sediment found in close proximity to modern
drainages. Holocene in age.
Enumerated Domain Value Definition Source: Open-File Report O-08-01 (Mertzman (2008)).
Enumerated Domain:
Enumerated Domain Value: Undifferentiated colluvium and alluvium
Enumerated Domain Value Definition: Unconsolidated sediment whose origin is related to glacial
activity. In this instance the sediment owes its origin to fluvial activity and was subsequently
modified by periglacial /permafrost activity. Holocene and Pleistocene in age.
Enumerated Domain Value Definition Source: Open-File Report O-08-01 (Mertzman (2008)).
Enumerated Domain:
Enumerated Domain Value: Lacustrine deposits
Enumerated Domain
Value Definition: Unconsolidated
sediment found in association with the
“
Enumerated Domain Value Definition Source: Open-File Report O-08-01 (Mertzman (2008)).
Enumerated Domain:
Enumerated Domain Value: Basaltic to basaltic andesite vent deposits
Enumerated Domain Value Definition: Poorly lithified to unconsolidated lapilli to ash-sized cinders
black to brown to red in color with lesser amounts of similarly colored lava spatter, bombs, and
scoria. These deposits mark volcanic vents areas that are often cinder cones. Pliocene to
Pleistocene in age.
Enumerated Domain Value Definition Source: Open-File Report O-08-01 (Mertzman (2008)).
Enumerated Domain:
Enumerated
Domain Value: Basalt of
Enumerated Domain Value Definition: See Mertzman (2008) for a detailed description of this unit.
Enumerated Domain Value Definition Source: Open-File Report O-08-01 (Mertzman (2008)).
Enumerated Domain:
Enumerated
Domain Value: Basaltic Andesite of Aspen
Enumerated Domain Value Definition: See Mertzman (2008) for a detailed description of this unit.
Enumerated Domain Value Definition Source: Open-File Report O-08-01 (Mertzman (2008)).
Enumerated Domain:
Enumerated
Domain Value: Basaltic Andesite of
Clover
Enumerated Domain Value Definition: See Mertzman (2008) for a detailed description of this unit.
Enumerated Domain Value Definition Source: Open-File Report O-08-01 (Mertzman (2008)).
Enumerated Domain:
Enumerated
Domain Value: Basalt of
Enumerated Domain Value Definition: See Mertzman (2008) for a detailed description of this unit.
Enumerated Domain Value Definition Source: Open-File Report O-08-01 (Mertzman (2008)).
Enumerated Domain:
Enumerated Domain Value: Basaltic Andesite of Roma
Enumerated Domain Value Definition: See Mertzman (2008) for a detailed description of this unit.
Enumerated Domain Value Definition Source: Open-File Report O-08-01 (Mertzman (2008)).
Enumerated Domain:
Enumerated
Domain Value: Basalt of
Enumerated Domain Value Definition: See Mertzman (2008) for a detailed description of this unit.
Enumerated Domain Value Definition Source: Open-File Report O-08-01 (Mertzman (2008)).
Enumerated Domain:
Enumerated
Domain Value: Basalt of
Enumerated Domain Value Definition: See Mertzman (2008) for a detailed description of this unit.
Enumerated Domain Value Definition Source: Open-File Report O-08-01 (Mertzman (2008)).
Enumerated Domain:
Enumerated
Domain Value: Basaltic Andesite of
Enumerated Domain Value Definition: See Mertzman (2008) for a detailed description of this unit.
Enumerated Domain Value Definition Source: Open-File Report O-08-01 (Mertzman (2008)).
Enumerated Domain:
Enumerated Domain Value: Basalt of Keno
Enumerated Domain Value Definition: See Mertzman (2008) for a detailed description of this unit.
Enumerated Domain Value Definition Source: Open-File Report O-08-01 (Mertzman (2008)).
Enumerated Domain:
Enumerated Domain Value: Basalt of Tom Reservoir
Enumerated Domain Value Definition: See Mertzman (2008) for a detailed description of this unit.
Enumerated Domain Value Definition Source: Open-File Report O-08-01 (Mertzman (2008)).
Enumerated Domain:
Enumerated
Domain Value: Basaltic Andesite of
Enumerated Domain Value Definition: See Mertzman (2008) for a detailed description of this unit.
Enumerated Domain Value Definition Source: Open-File Report O-08-01 (Mertzman (2008)).
Enumerated Domain:
Enumerated
Domain Value: Basalt of
Enumerated Domain Value Definition: See Mertzman (2008) for a detailed description of this unit.
Enumerated Domain Value Definition Source: Open-File Report O-08-01 (Mertzman (2008)).
Enumerated Domain:
Enumerated
Domain Value: Basaltic Andesite of
Enumerated Domain Value Definition: See Mertzman (2008) for a detailed description of this unit.
Enumerated Domain Value Definition Source: Open-File Report O-08-01 (Mertzman (2008)).
Enumerated Domain:
Enumerated
Domain Value: Basaltic Andesite of
Enumerated Domain Value Definition: See Mertzman (2008) for a detailed description of this unit.
Enumerated Domain Value Definition Source: Open-File Report O-08-01 (Mertzman (2008)).
Enumerated Domain:
Enumerated Domain Value: Basaltic Andesite of Camp Creek
Enumerated Domain Value Definition: See Mertzman (2008) for a detailed description of this unit.
Enumerated Domain Value Definition Source: Open-File Report O-08-01 (Mertzman (2008)).
Attribute:
Attribute Label: Age_Geologic_Time_Scale
Attribute Definition: The Age_Geologic_Time_Scale represents the age of a unit in terms of the “Stage Age”
(convention not completely followed, only Lower, Middle, and Upper are used as classes in this naming
category) and “Series Epoch” classifiers of the 2007 International Stratigraphic Chart (International
Commission on Stratigraphy, 2007) as defined by dates calculated by Gradstein et al. (2004). The attribute
value was determined by a comparison of a unit’s dated age(s) to the stratigraphic age boundaries in the 2007
International Stratigraphic Chart (International Commission on Stratigraphy, 2007). A range of geologic time
scale ages may be provided for a unit due to a range of ages calculated for one or more samples therein by K-Ar
or 40Ar/39Ar dating methods. This attribute provides a low resolution representation of the age of a unit.
Attribute Definition Source: See Mertzman (2008), International Convention on Stratigraphy (2007), and Gradstein et
al. (2004)
Attribute Domain Values:
Enumerated Domain:
Enumerated Domain Value: Holocene
Enumerated Domain Value Definition: < 0.0115 million years ago (Ma)
Enumerated Domain Value Definition Source: Gradstein et al. (2004), International Convention on
Stratigraphy (2007), and Mertzman (2008)
Enumerated Domain:
Enumerated Domain Value: Holocene and Pleistocene
Enumerated Domain Value Definition: < 1.806 million years ago (Ma)
Enumerated Domain Value Definition Source: Gradstein et al. (2004), International Convention on
Stratigraphy (2007), and Mertzman (2008)
Enumerated Domain:
Enumerated Domain Value: Pleistocene
Enumerated Domain Value Definition: 1.806 - 0.0115 million years ago (Ma)
Enumerated Domain Value Definition Source: Gradstein et al. (2004), International Convention on
Stratigraphy (2007), and Mertzman (2008)
Enumerated Domain:
Enumerated Domain Value: Pliocene
Enumerated Domain Value Definition: 5.332 – 1.806 million years ago (Ma)
Enumerated Domain Value Definition Source: Gradstein et al. (2004), International Convention on
Stratigraphy (2007), and Mertzman (2008)
Enumerated Domain:
Enumerated Domain Value: Lower Pleistocene
Enumerated Domain Value Definition: 1.806 – 0.781 million years ago (Ma)
Enumerated Domain Value Definition Source: Gradstein et al. (2004), International Convention on
Stratigraphy (2007), and Mertzman (2008)
Enumerated Domain:
Enumerated Domain Value: Middle Pleistocene
Enumerated Domain Value Definition: 0.781 – 0.126 million years ago (Ma)
Enumerated Domain Value Definition Source: Gradstein et al. (2004), International Convention on
Stratigraphy (2007), and Mertzman (2008)
Enumerated Domain:
Enumerated Domain Value: Upper Pliocene
Enumerated Domain Value Definition: 2.588 – 1.806 million years ago (Ma)
Enumerated Domain Value Definition Source: Gradstein et al. (2004), International Convention on
Stratigraphy (2007), and Mertzman (2008)
Enumerated Domain:
Enumerated Domain Value: Middle Pliocene
Enumerated Domain Value Definition: 3.600 – 2.588 million years ago (Ma)
Enumerated Domain Value Definition Source: Gradstein et al. (2004), International Convention on
Stratigraphy (2007), and Mertzman (2008)
Enumerated Domain:
Enumerated Domain Value: Lower Pliocene
Enumerated Domain Value Definition: 5.332 – 3.600 million years ago (Ma)
Enumerated Domain Value Definition Source: Gradstein et al. (2004), International Convention on
Stratigraphy (2007), and Mertzman (2008)
Attribute:
Attribute Label: Age_Ma
Attribute Definition: The Age_Ma attribute describes the absolute age or age-range of a unit in millions of years as
determined by the dating of collected rock samples with K-Ar or 40Ar/39Ar methods. The values are presented
with the calculated ages and their error ranges. All units have been age-dated using either of the two
aforementioned radiometric dating methods, except for the Qal (Alluvium), Qg (Undifferentiated colluvium
and alluvium), and Qs (Lacustrine deposits). The Range domain described below pertains to the radiometrically
dated samples. The value for the Qg and Qs units is “unknown Quaternary (<1.806 Ma).” The value for the Qal
unit is “unknown Holocene (<0.0115 Ma).” The Qbv and Qid units (sub-unit) are tentatively given the age of
the units of which they are considered part since the age dated samples did not come from these areas.
Attribute Definition Source: See Mertzman (2008)
Attribute Domain Values:
Range Domain:
Range Domain Minimum: <0.0115 Ma
Range Domain Maximum: 3.85 +/- 0.10 Ma
Attribute Units of Measure: Millions of years (Ma)
Detailed Description:
Entity Type:
Entity Type Label: Unit Boundary
Entity Type Definition: A unit boundary is the same as a contact. It is the ground-surface (or its trace on the surface, if
buried/concealed) boundary between two rock units. In this data set, the unit boundaries are polylines traced on
the unit polygon boundaries (except on the boundaries that corresponded with the edges of the quadrangle and
were not the true unit boundaries). The contacts have been approximately located. The unit boundary entities
contain no attribute information.
Entity Type Definition Source: None
Attribute:
Attribute Label: SpencerCreekUnitBounds
Attribute Definition: This attribute contains no information and was created by MapInfo Professional version 7.0 when
the polylines were created with that program (although it originally had a slightly different name which has since
been changed). Each row in this attribute column corresponds to a polyline within the data set, not necessarily
the complete length of a unit’s boundary present on the map.
Attribute Definition Source: None
Detailed Description:
Entity Type:
Entity Type Label: Sample
Entity Type Definition: A sample, with regard to this data set, is a field-collected rock specimen from an in situ outcrop
(lava flows or vent deposits) located within the boundaries of the Spencer Creek USGS 7.5’ quadrangle
(42122b1). The goal was to collect a representative suite of samples for each unit. A sample may have been
apportioned for the following possible types of analysis: hand-sample analysis with possible use of a hand lens
and other tools; chemical analysis by x-ray fluorescence spectroscopy (all samples); thin section analysis; age-
dating by either K-Ar or 40Ar/39Ar methods. Samples can be displayed as point data.
In the SpencerCreekSamples file, sample collection locations are indicated with either a black triangle or with a
yellow square with a black outline. The black triangles represent samples for which there is available chemistry
data in the attributes table. The yellow squares represent samples that have been age-dated by K-Ar or 40Ar/39Ar
dating methods and also have chemistry data in the data table (attribute table).
Entity Type Definition Source: See Mertzman (2008)
Attribute:
Attribute Label: Map_No
Attribute Definition: The Map_No is the map number. The map number is displayed on the Geologic maps made using
this dataset, such as the O-08-01Map30x36.pdf discussed above. Map numbers were assigned sequentially
to all of the samples after they were organized by age, formation, and silica content. The samples and their data
were organized first by the formation, from oldest to youngest formation. Within each formation the data were
further organized by placing age-dated samples before samples that were not age-dated. The age-dated samples
for each formation were arranged by silica content, from lowest to highest silica content. Then the non-age-
dated samples for each formation were arranged by silica content, from lowest to highest. After the data were
organized, the map numbers were assigned sequentially down the data table from 1 to 184.
Attribute Definition Source: None
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 1
Range Domain Maximum: 184
Attribute:
Attribute Label: Sample_No
Attribute Definition: The Sample_No is the combination of numbers and possibly letters that was assigned to a sample
when it was collected in the field, or shortly thereafter. The letters, if present indicate the initials of the person
who collected the sample and the first two numbers represent the last two digits of the year in which the sample
was collected. After the first two numbers (possibly with two letters) is a dash followed by a unique number
that indicates a sample’s place in the order of collection for a particular year.
Attribute Definition Source: None
Attribute Domain Values:
Unpresentable Domain: The values of this attribute were created systematically, but they are not all numerical
and there is no very easy way to describe the domain of these values without creating a sizeable list of
the actual values. It is best to understand how the Sample_No attribute was assigned as discussed in the
Attribute Definition above.
Attribute:
Attribute Label: KAr_Age_Ma
Attribute Definition: The KAr_Age_Ma is a sample’s absolute age in millions of years as determined by K-Ar or
40Ar/39Ar dating methods. Not all samples collected in the Spencer Creek 7.5’ quadrangle have been age-dated.
Also provided is the error range of the dated age of a sample.
Attribute Definition Source: Consult Mertzman (2008)
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 1.19 +/- 0.11
Range Domain Maximum: 2.54 +/- 0.05
Attribute Units of Measure: Millions of years (Ma)
Attribute:
Attribute Label: Qtr_of_Qtr
Attribute Definition: The Qtr_of_Qtr attribute is the quarter-quarter section classifier of the Public Land Survey
System (PLSS). This attribute describes in what quarter (NW, NE, SE, SW) of a quarter section of a section of
a township a sample was collected. All Township descriptors are according to the grid defined by the
Willamette
Attribute Definition Source: Consult http://www-atlas.usgs.gov/articles/boundaries/a_plss.html and
http://www.blm.gov/or/landrecords/legaldescrip.php
Attribute Domain Values:
Enumerated Domain:
Enumerated Domain Value: NW
Enumerated Domain Value Definition: The northwest quarter of a quarter section of a section of a
township.
Enumerated Domain
Value Definition Source: Consult http://www-atlas.usgs.gov/articles/
Enumerated Domain:
Enumerated Domain Value: NE
Enumerated Domain Value Definition: The northeast quarter of a quarter section of a section of a
township.
Enumerated Domain
Value Definition Source: Consult http://www-atlas.usgs.gov/articles/
Enumerated Domain:
Enumerated Domain Value: SE
Enumerated Domain Value Definition: The southeast quarter of a quarter section of a section of a
township.
Enumerated Domain
Value Definition Source: Consult http://www-atlas.usgs.gov/articles/
Enumerated Domain:
Enumerated Domain Value: SW
Enumerated Domain Value Definition: The southwest quarter of a quarter section of a section of a
township.
Enumerated Domain
Value Definition Source: Consult http://www-atlas.usgs.gov/articles/
Attribute:
Attribute Label: Qtr_of_Sec
Attribute Definition: The Qtr_of_Sec attribute is the quarter section classifier of the (PLSS). This attribute describes in
what quarter section (NW, NE, SE, SW) of a section of a township a sample was collected. All Township
descriptors are according to the grid defined by the Willamette Meridian and Willamette Base Line of the PLSS.
Attribute Definition Source: Consult http://www-atlas.usgs.gov/articles/boundaries/a_plss.html and
http://www.blm.gov/or/landrecords/legaldescrip.php
Attribute Domain Values:
Enumerated Domain:
Enumerated Domain Value: NW
Enumerated Domain Value Definition: The northwest quarter section of a section of a township.
Enumerated
Domain Value Definition Source: Consult http://www-atlas.usgs.gov/articles/
Enumerated Domain:
Enumerated Domain Value: NE
Enumerated Domain Value Definition: The northeast quarter section of a section of a township.
Enumerated
Domain Value Definition Source: Consult http://www-atlas.usgs.gov/articles/
Enumerated Domain:
Enumerated Domain Value: SE
Enumerated Domain Value Definition: The southeast quarter section of a section of a township.
Enumerated
Domain Value Definition Source: Consult http://www-atlas.usgs.gov/articles/
Enumerated Domain:
Enumerated Domain Value: SW
Enumerated Domain Value Definition: The southwest quarter section of a section of a township.
Enumerated Domain Value Definition
Source: Consult http://www-atlas.usgs.gov/articles/
Attribute:
Attribute Label: Sec
Attribute Definition: The Sec is the Section of the Township (according to the PLSS grid) in which the sample was
collected. The Section is “a one-square-mile block of land, containing 640 acres, or approximately one thirty-
sixth of a township. Due to the curvature of the Earth, sections may occasionally be slightly smaller than one
square mile.” All Township descriptors are according to the grid defined by the Willamette Meridian and
Attribute Definition Source: Consult http://www-atlas.usgs.gov/articles/boundaries/a_plss.html and
http://www.blm.gov/or/landrecords/legaldescrip.php
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 1
Range Domain Maximum: 36
Attribute:
Attribute Label: T_S
Attribute Definition: The T_S (Township_South) is the value of the horizontal row of townships in the PLSS grid
(Willamette Meridian and Willamette Base Line) in which the sample was collected. The “S” (South) descriptor
indicates that the township rows that pertain to this data set are south of the Willamette Base Line of the PLSS.
When combined with the R_E (Range) attribute value, this information provides the specific ~36 square mile
Township in the Willamette Meridian and Base Line defined grid of the PLSS in which the sample was
collected. The other more specific PLSS descriptor attributes were described and discussed above.
Attribute Definition Source: Consult http://www-atlas.usgs.gov/articles/boundaries/a_plss.html and
http://www.blm.gov/or/landrecords/legaldescrip.php
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 38
Range Domain Maximum: 39
Attribute:
Attribute Label: R_E
Attribute Definition: The R_E (Range_East) is the value of the vertical column of townships in the PLSS grid
(Willamette Meridian and Willamette Base Line) in which the sample was collected. The “E” (East) descriptor
indicates that the township columns that pertain to this data set are to the East of the Willamette Meridian.
When combined with the T_S attribute value, this information provides the specific ~36 square mile Township
in the Willamette Meridian and Base Line defined grid of the PLSS in which the sample was collected. The
other more specific PLSS descriptor attributes were described above.
Attribute Definition Source: Consult http://www-atlas.usgs.gov/articles/boundaries/a_plss.html and
http://www.blm.gov/or/landrecords/legaldescrip.php
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 6
Range Domain Maximum: 7
Attribute:
Attribute Label: UTM_E_m
Attribute Definition: This is the easting value in meters of a sample’s collection location according to the NAD 1927
UTM Zone 10 projection system. This value was determined with the MapInfo Professional version 7.0
Coordinate Extractor extension. In cases where the UTM coordinates were already known, the coordinate
extractor extracted these same coordinates. Please note that the precision indicated by this value does not
necessarily represent the precision with which a sample’s location was determined. Instead, it represents the
precision of the MapInfo v.7.0 Coordinate extension’s results as determined for carefully digitized sample
location points (from original paper maps to the drg of the quadrangle, except where coordinates were provided
and already rounded to the nearest 10 meters).
Attribute Definition Source: Consult http://erg.usgs.gov/isb/pubs/factsheets/fs07701.html
Attribute Domain Values:
Range Domain:
Range
Domain Minimum: 572,290.76
Range
Domain Maximum: 582,497.72
Attribute Units of Measure: meters
Attribute:
Attribute Label: UTM_N_m
Attribute Definition: This is the northing value in meters of a sample's collection location according to the NAD 1927
UTM Zone 10 projection system. This value was determined with the MapInfo Professional version 7.0
Coordinate Extractor extension. In cases where the UTM coordinates were already known, the coordinate
extractor extracted these same coordinates. Please note that the precision indicated by this value does not
necessarily represent the precision with which a sample’s location was determined. Instead, it represents the
precision of the MapInfo v.7.0 Coordinate extension’s results as determined for carefully digitized sample
location points (from original paper maps to the drg of the quadrangle, except where coordinates were provided
and already rounded to the nearest 10 meters).
Attribute Definition Source: Consult http://erg.usgs.gov/isb/pubs/factsheets/fs07701.html
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 4,664,036.17
Range
Domain Maximum: 4,677,674.98
Attribute Units of Measure: meters
Attribute:
Attribute Label: Unit
Attribute Definition: This is the unit, indicated by the unit’s symbol, to which a collected rock sample belongs. Samples
collected in an area of Qbv are grouped with the unit in which the Qbv is found (except in the case of the
southernmost area of Qbv in the Spencer Creek 7.5’ quadrangle, which is part of the Qbbl unit, but is not found
within or even adjacent to this unit).
Attribute Definition Source: See Mertzman (2008)
Attribute Domain Values:
Enumerated Domain:
Enumerated Domain Value: Tpbac
Enumerated Domain Value Definition: Basaltic Andesite of Camp Creek (Lower to Middle Pliocene)
Enumerated Domain Value Definition Source: See Mertzman (2008)
Enumerated Domain:
Enumerated Domain Value: Tpbab
Enumerated
Domain Value Definition: Basaltic
Andesite of
Enumerated Domain Value Definition Source: See Mertzman (2008)
Enumerated Domain:
Enumerated Domain Value: Tpbps
Enumerated
Domain Value Definition: Basalt of
Enumerated Domain Value Definition Source: See Mertzman (2008)
Enumerated Domain:
Enumerated Domain Value: Tpbacm
Enumerated
Domain Value Definition: Basaltic
Andesite of
Enumerated Domain Value Definition Source: See Mertzman (2008)
Enumerated Domain:
Enumerated Domain Value: Tpbtr
Enumerated Domain Value Definition: Basalt of Tom Reservoir (Upper Pliocene)
Enumerated Domain Value Definition Source: See Mertzman (2008)
Enumerated Domain:
Enumerated Domain Value: Tpbke
Enumerated Domain Value Definition: Basalt of Keno (Upper Pliocene to Lower Pleistocene)
Enumerated Domain Value Definition Source: See Mertzman (2008)
Enumerated Domain:
Enumerated Domain Value: Tpbas
Enumerated
Domain Value Definition: Basaltic
Andesite of
Lower Pleistocene)
Enumerated Domain Value Definition Source: See Mertzman (2008)
Enumerated Domain:
Enumerated Domain Value: Qbsc
Enumerated
Domain Value Definition: Basalt of
Enumerated Domain Value Definition Source: See Mertzman (2008)
Enumerated Domain:
Enumerated Domain Value: Qbbl
Enumerated
Domain Value Definition: Basalt of
Enumerated Domain Value Definition Source: See Mertzman (2008)
Enumerated Domain:
Enumerated Domain Value: Qbar
Enumerated Domain Value Definition: Basaltic Andesite of Roma (Lower Pleistocene)
Enumerated Domain Value Definition Source: See Mertzman (2008)
Enumerated Domain:
Enumerated Domain Value: Qbbp
Enumerated
Domain Value Definition: Basalt of
Enumerated Domain Value Definition Source: See Mertzman (2008)
Enumerated Domain:
Enumerated Domain Value: Qbac
Enumerated
Domain Value Definition: Basaltic
Andesite of Clover
Enumerated Domain Value Definition Source: See Mertzman (2008)
Enumerated Domain:
Enumerated Domain Value: Qbaa
Enumerated
Domain Value Definition: Basaltic
Andesite of Aspen
Enumerated Domain Value Definition Source: See Mertzman (2008)
Enumerated Domain:
Enumerated Domain Value: Qbrl
Enumerated
Domain Value Definition: Basalt of
Enumerated Domain Value Definition Source: See Mertzman (2008)
Attribute:
Attribute Label: Lith
Attribute Definition: The Lith attribute is an abbreviation of the lithology of the sample according to the total alkali
(Na2O + K2O (weight%(wt%))) versus silica (SiO2 wt%) classification (TAS classification) for volcanic rocks
of Le Maitre (2002). The chemistry of the sample was determined by x-ray fluorescence (XRF) spectroscopy.
Macroscopic characteristics of the various lithologies are not discussed here.
Attribute Definition Source: See Mertzman (2008) and Le Maitre (2002)
Attribute Domain Values:
Enumerated Domain:
Enumerated Domain Value: B
Enumerated Domain Value Definition: Basalt: a volcanic rock with a silica content of 45-52 wt% and
less than 5 wt% total alkali (Na2O + K2O wt%) content.
Enumerated Domain Value Definition Source: See Mertzman (2008) and Le Maitre (2002)
Enumerated Domain:
Enumerated Domain Value: BA
Enumerated Domain Value Definition: Basaltic Andesite: a volcanic rock with 52-57 wt% silica content
and a total alkali content of less than 5 wt% at 52 wt% SiO2 and less than 5.9 wt% at 57 wt%
SiO2. Between 52 and 57 wt% SiO2, the upper total alkali boundary increases linearly from 5 to
5.9 wt%.
Enumerated Domain Value Definition Source: See Mertzman (2008), Le Maitre (2002) and
http://www.geol.lsu.edu/henry/Geology3041/lectures/02IgneousClassify/IUGS-
Enumerated Domain:
Enumerated Domain Value: B/BA
Enumerated Domain Value Definition: Basalt/ Basaltic Andesite: a volcanic rock the lies on the basalt
and basaltic andesite boundary in the TAS classification scheme of Le Maitre (2002). The silica
content is 52 wt% and the total alkali content is less than 5 wt%.
Enumerated Domain Value Definition Source: See Mertzman (2008), Le Maitre (2002), and
http://www.geol.lsu.edu/henry/Geology3041/lectures/02IgneousClassify/IUGS-
Enumerated Domain:
Enumerated Domain Value: TrA
Enumerated Domain Value Definition: Trachyandesite: a volcanic rock with a silica content ranging
from 53 to 63 wt% and a variably higher total alkali content than basalts, basaltic andesites, and
basaltic trachy-andesites of equivalent silica content. Please see Figure 6 in Open-File Report
O-08-01 (Mertzman 2008) or a TAS classification chart elsewhere (such as
http://www.geol.lsu.edu/henry/Geology3041/lectures/02IgneousClassify/IUGS-
IgneousClassFlowChart.htm) to better understand the Silica/ total alkali boundaries of this rock
type.
Enumerated Domain Value Definition Source: See Mertzman (2008), Le Maitre (2002), and
http://www.geol.lsu.edu/henry/Geology3041/lectures/02IgneousClassify/IUGS-
Attribute:
Attribute Label: SiO2_%
Attribute Definition: The weight percent (wt%) of silica (SiO2) in the sample as measured by XRF spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 47.22
Range Domain Maximum: 56.60
Attribute Units of Measure: weight percent (wt%)
Attribute:
Attribute Label: TiO2_%
Attribute Definition: The weight percent (wt%) of titanium (TiO2) in the sample as measured by XRF spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 0.75
Range Domain Maximum: 1.63
Attribute Units of Measure: weight percent (wt%)
Attribute:
Attribute Label: Al2O3_%
Attribute Definition: The weight percent (wt%) of aluminum (Al2O3) in the sample as measured by XRF spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 15.86
Range Domain Maximum: 21.89
Attribute Units of Measure: weight percent (wt%)
Attribute:
Attribute Label: Fe2O3_%
Attribute Definition: The weight percent (wt%) of ferric iron (Fe2O3) in the sample as calculated using results
measured by XRF spectroscopy and Iron Titration.
Attribute Definition Source: See http://fandm.edu/x7991.xml and http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 1.00
Range Domain Maximum: 8.67
Attribute Units of Measure: weight percent (wt%)
Attribute:
Attribute Label: FeO_%
Attribute Definition: The weight percent (wt%) of ferrous Iron (FeO) in the sample determined by Iron Titration.
Attribute Definition Source: See http://fandm.edu/x7991.xml and http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 0.38
Range Domain Maximum: 9.11
Attribute Units of Measure: weight percent (wt%)
Attribute:
Attribute Label: MnO_%
Attribute Definition: The weight percent (wt%) of manganese (MnO) in the sample as measured by XRF spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 0.11
Range Domain Maximum: 0.23
Attribute Units of Measure: weight percent (wt%)
Attribute:
Attribute Label: MgO_%
Attribute Definition: The weight percent (wt%) of magnesium (MgO) in the sample as measured by XRF spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 2.76
Range Domain Maximum: 9.19
Attribute Units of Measure: weight percent (wt%)
Attribute:
Attribute Label: CaO_%
Attribute Definition: The weight percent (wt%) of calcium (CaO) in the sample as measured by XRF spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 6.68
Range Domain Maximum: 11.60
Attribute Units of Measure: weight percent (wt%)
Attribute:
Attribute Label: Na2O_%
Attribute Definition: The weight percent (wt%) of sodium (Na2O) in the sample as measured by XRF spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 2.50
Range Domain Maximum: 5.57
Attribute Units of Measure: weight percent (wt%)
Attribute:
Attribute Label: K2O_%
Attribute Definition: The weight percent (wt%) of potassium (K2O) in the sample as measured by XRF spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 0.09
Range Domain Maximum: 1.58
Attribute Units of Measure: weight percent (wt%)
Attribute:
Attribute Label: P2O5_%
Attribute Definition: The weight percent (wt%) of phosphorous (P2O5) in the sample as measured by XRF
spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 0.07
Range Domain Maximum: 0.55
Attribute Units of Measure: weight percent (wt%)
Attribute:
Attribute Label: LOI_%
Attribute Definition: True Loss on Ignition: the amount of weight lost (weight percent (wt%)) by the sample after
heating to between 900ºC and 950ºC for one hour added to a value that accounts for the changes in weight
resulting from the oxidation of ferrous iron.
Attribute Definition Source: See http://fandm.edu/x7991.xml and http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 0.34
Range Domain Maximum: 2.85
Attribute Units of Measure: weight percent (wt%)
Attribute:
Attribute Label: Total_%
Attribute Definition: The total weight percent (wt%) is the sum of the weight percent values for SiO2, TiO2, Al2O3,
Fe2O3, FeO, MnO, MgO, CaO, Na2O, K2O, P2O5, and LOI.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 99.25
Range Domain Maximum: 100.69
Attribute Units of Measure: weight percent (wt%)
Attribute:
Attribute Label: Fe2O3T_%
Attribute Definition: The ferric iron content (wt%) measured by XRF spectroscopy. This is not the true amount of
ferric iron originally present in the rock sample because it also accounts for ferrous iron that was oxidized to
ferric iron during the preparation for XRF. The Fe2O3_% value described above is the true amount of ferric iron
present in the rock sample.
Attribute Definition Source: See http://fandm.edu/x7991.xml and http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 6.94
Range Domain Maximum: 12.07
Attribute Units of Measure: weight percent (wt%)
Attribute:
Attribute Label: Rb_ppm
Attribute Definition: The amount (in parts per million (ppm)) of rubidium present in the sample as measured by XRF
spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 0.5
Range Domain Maximum: 30.1
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Sr_ppm
Attribute Definition: The amount (in parts per million (ppm)) of strontium present in the sample as measured by XRF
spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 270
Range Domain Maximum: 1222
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Y_ppm
Attribute Definition: The amount (in parts per million (ppm)) of yttrium present in the sample as measured by XRF
spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 13.1
Range Domain Maximum: 37.2
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Zr_ppm
Attribute Definition: The amount (in parts per million (ppm)) of zirconium present in the sample as measured by XRF
spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 48
Range Domain Maximum: 156
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: V_ppm
Attribute Definition: The amount (in parts per million (ppm)) of vanadium present in the sample as measured by XRF
spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 118
Range Domain Maximum: 788
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Ni_ppm
Attribute Definition: The amount (in parts per million (ppm)) of nickel present in the sample as measured by XRF
spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 10
Range Domain Maximum: 182
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Cr_ppm
Attribute Definition: The amount (in parts per million (ppm)) of chromium present in the sample as measured by XRF
spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 19
Range Domain Maximum: 407
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Nb_ppm
Attribute Definition: The amount (in parts per million (ppm)) of niobium present in the sample as measured by XRF
spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 1.9
Range Domain Maximum: 9.8
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Ga_ppm
Attribute Definition: The amount (in parts per million (ppm)) of gallium present in the sample as measured by XRF
spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 15.6
Range Domain Maximum: 22.8
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Cu_ppm
Attribute Definition: The amount (in parts per million (ppm)) of copper present in the sample as measured by XRF
spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 36
Range Domain Maximum: 281
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Zn_ppm
Attribute Definition: The amount (in parts per million (ppm)) of zinc present in the sample as measured by XRF
spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 59
Range Domain Maximum: 95
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Co_ppm
Attribute Definition: The amount (in parts per million (ppm)) of cobalt present in the sample as measured by XRF
spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 17
Range Domain Maximum: 44
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Ba_ppm
Attribute Definition: The amount (in parts per million (ppm)) of barium present in the sample as measured by XRF
spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 60
Range Domain Maximum: 971
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: La_ppm
Attribute Definition: The amount (in parts per million (ppm)) of lanthanum present in the sample as measured by XRF
spectroscopy. Lanthanum content has not been measured in every sample, where no measurement occurred or
the value was below the instrument’s limit of sensitivity, a “—“ has been placed.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 2
Range Domain Maximum: 36
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Ce_ppm
Attribute Definition: The amount (in parts per million (ppm)) of cesium present in the sample as measured by XRF
spectroscopy. Cesium content has not been measured in every sample, where no measurement occurred or the
value was below the instrument’s limit of sensitivity, a “—“ has been placed.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 7.8
Range Domain Maximum: 69.6
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: U_ppm
Attribute Definition: The amount (in parts per million (ppm)) of uranium present in the sample as measured by XRF
spectroscopy. Not all samples have been measured for uranium. Uranium content has not been measured in
every sample, where no measurement occurred or the value was below the instrument’s limit of sensitivity, a
“—“ has been placed.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: <0.5
Range Domain Maximum: 2.6
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Th_ppm
Attribute Definition: The amount (in parts per million (ppm)) of thorium present in the sample as measured by XRF
spectroscopy. Thorium content has not been measured in every sample, where no measurement occurred or the
value was below the instrument’s limit of sensitivity, a “—“ has been placed.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 0.3
Range Domain Maximum: 4
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Sc_ppm
Attribute Definition: The amount (in parts per million (ppm)) of scandium present in the sample as measured by XRF
spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 18
Range Domain Maximum: 38.7
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Pb_ppm
Attribute Definition: The amount (in parts per million (ppm)) of lead present in the sample as measured by XRF
spectroscopy.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 3
Range Domain Maximum: 23.1
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Yb_ppm
Attribute Definition: The amount (in parts per million (ppm)) of ytterbium present in the sample as measured by XRF
spectroscopy. Ytterbium content has not been measured in most of the samples from the Spencer Creek 7.5’
quadrangle; where no measurement occurred or the value was below the instrument’s limit of sensitivity, a
“—“ has been placed.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 2.2
Range Domain Maximum: 2.9
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Be_ppm
Attribute Definition: The amount (in parts per million (ppm)) of beryllium present in the sample as measured by XRF
spectroscopy. There are only two samples in the Spencer Creek 7.5’ quadrangle in which beryllium has been
measured, and both samples have the same measured beryllium content. All other samples have a “—“ as an
indication that the beryllium was not measured or was below the limit of sensitivity of the instrument.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 1.4
Range Domain Maximum: 1.4
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Hf_ppm
Attribute Definition: The amount (in parts per million (ppm)) of hafnium present in the sample as measured by XRF
spectroscopy. Hafnium has only been measured in one sample from the Spencer Creek 7.5’ quadrangle
(95MH-87), a “—“ is present for this attribute for all of the other samples from this quadrangle.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 2.7
Range Domain Maximum: 2.7
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Ta_ppm
Attribute Definition: The amount (in parts per million (ppm)) of tantalum present in the sample as measured by XRF
spectroscopy. Tantalum has only been measured in one sample from the Spencer Creek 7.5’ quadrangle
(95MH-87), a “—“ is present for this attribute for all of the other samples from this quadrangle.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: <0.3
Range Domain Maximum: <0.3
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Nd_ppm
Attribute Definition: The amount (in parts per million (ppm)) of neodymium present in the sample as measured by
XRF spectroscopy. Neodymium has only been measured in one sample from the Spencer Creek 7.5’ quadrangle
(95MH-87), a “—“ is present for this attribute for all of the other samples from this quadrangle.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 20
Range Domain Maximum: 20
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Sm_ppm
Attribute Definition: The amount (in parts per million (ppm)) of samarium present in the sample as measured by XRF
spectroscopy. Samarium has only been measured in one sample from the Spencer Creek 7.5’ quadrangle
(95MH-87), a “—“ is present for this attribute for all of the other samples from this quadrangle.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 4.52
Range Domain Maximum: 4.52
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Eu_ppm
Attribute Definition: The amount (in parts per million (ppm)) of europium present in the sample as measured by XRF
spectroscopy. Europium has only been measured in one sample from the Spencer Creek 7.5’ quadrangle
(95MH-87), a “—“ is present for this attribute for all of the other samples from this quadrangle.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 1.4
Range Domain Maximum: 1.4
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Tb_ppm
Attribute Definition: The amount (in parts per million (ppm)) of terbium present in the sample as measured by XRF
spectroscopy. Terbium has only been measured in one sample from the Spencer Creek 7.5’ quadrangle
(95MH-87), a “—“ is present for this attribute for all of the other samples from this quadrangle.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 0.7
Range Domain Maximum: 0.7
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: Lu_ppm
Attribute Definition: The amount (in parts per million (ppm)) of lutetium present in the sample as measured by XRF
spectroscopy. Lutetium has only been measured in one sample from the Spencer Creek 7.5’ quadrangle
(95MH-87), a “—“ is present for this attribute for all of the other samples from this quadrangle.
Attribute Definition Source: See http://fandm.edu/x7985.xml
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 0.33
Range Domain Maximum: 0.33
Attribute Units of Measure: parts per million (ppm)
Attribute:
Attribute Label: DatedOrNot
Attribute
Definition: This attribute is only
present in the ESRI Shapefile formatted
(SpencerCreekSamples_point.shp). This attribute indicates if a sample was age-dated or not.
Attribute Definition Source: None
Attribute Domain Values:
Enumerated Domain:
Enumerated Domain Value: Y
Enumerated Domain Value Definition: The Y stands for “Yes,” meaning that this rock sample has been
age-dated by K-Ar or 40Ar/39Ar dating methods.
Enumerated Domain Value Definition Source: None
Enumerated Domain:
Enumerated Domain Value: N
Enumerated Domain Value Definition: The N stands for “No,” meaning that this rock sample has not
been age-dated with radiometric dating methods.
Enumerated Domain Value Definition Source: None
Detailed Description:
Entity Type:
Entity Type Label: Volcanic Center
Entity Type Definition: A volcanic center is a source of volcanic rocks. In other words, it is a location where
subterranean magma has erupted onto the surface. The locations of the some of the volcanic centers in the
helped to locate volcanic centers where there were no vent deposits.
In this data set, the volcanic centers are point data displayed as red triangles with a black outline.
Entity Type Definition Source: See Mertzman (2008) for a description of the vent deposits.
Attribute:
Attribute Label: UTM_E_m
Attribute Definition: This is the easting value in meters of a volcanic center's location according to the NAD 1927
UTM Zone 10 projection system. This value was determined with the MapInfo Professional version 7.0
Coordinate Extractor tool. The precision of this value does not represent that with which it was determined, but
is the precision provided by MapInfo Professional v.7.0's Coordinate Extractor extension for the points
manually digitized to the georeferenced quadrangle drg.
Attribute Definition Source: None
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 572,510.39
Range Domain Maximum: 582,460.25
Attribute Units of Measure: meters
Attribute:
Attribute Label: UTM_N_m
Attribute Definition: This is the easting value in meters of a volcanic center's location according to the NAD 1927
UTM Zone 10 projection system. This value was determined with the MapInfo Professional version 7.0
Coordinate Extractor tool. The precision of this value does not represent that with which it was determined, but
is the precision provided by MapInfo Professional v.7.0's Coordinate Extractor extension for the points
manually digitized to the georeferenced quadrangle drg.
Attribute Definition Source: None
Attribute Domain Values:
Range Domain:
Range Domain Minimum: 4,664,894.39
Range Domain Maximum: 4,677,223.97
Attribute Units of Measure: meters
Detailed Description:
Entity Type:
Entity Type Label: Fault
Entity Type Definition: A fault is a planar fracture or area of fractured rock where there is relative movement of large
bodies of rock. There are many prominent faults in the Spencer Creek USGS 7.5’ Quadrangle. These faults are
normal faults.The dashed lines with the hatch marks/ tick marks/ bars represent the inferred location of the faults
where the fault traces are buried/ concealed. The solid lines with hatch marks/ tick marks/ bars represents the
approximate location of the fault traces. The hatch marks/ tick marks/ bars are on the down-dropped block
(hanging wall).
Entity Type Definition Source: See Mertzman (2008),
http://volcanoes.usgs.gov/Products/Pglossary/fault.html ,
http://www.ucmp.berkeley.edu/glossary/glossary_2.html ,
http://earthquake.usgs.gov/learning/glossary.php?term=fault%20plane
,
http://www2.nature.nps.gov/geology/usgsnps/deform/ghangft.html
and http://en.wikipedia.org/wiki/Fault_%28geology%29
Attribute:
Attribute Label: Appr_or_Conc
Attribute Definition: This attribute indicates if the fault trace is present on the earth’s surface or if the fault is buried,
such as by Quaternary-aged alluvium, colluvium, or lacustrine sediments.
Attribute Definition Source: None
Attribute Domain Values:
Enumerated Domain:
Enumerated Domain Value: Approximate
Enumerated Domain Value Definition: This indicates that the fault trace is present on the earth’s
surface and that its location is a close approximation. This portion of the fault is displayed on the
geologic map as a hatch-marked solid line with the bars / hatches on the down-dropped block
(hanging wall).
Enumerated Domain Value Definition Source: None
Enumerated Domain:
Enumerated Domain Value: Concealed
Enumerated Domain Value Definition: This indicates that the fault trace is not present on the surface
of the earth and that the fault is concealed, such as beneath Quaternary-aged alluvium,
colluvium, or lacustrine sediments. The location of the concealed portion of the fault has been
inferred and is displayed as a dashed line with hatch marks that lie on the down-dropped block /
hanging wall.
Enumerated Domain Value Definition Source: None
Attribute:
Attribute Label: Type_of_Fault
Attribute Definition: This attribute indicates the type of fault present.
Attribute Definition Source: None
Attribute Domain Values:
Enumerated Domain:
Enumerated
Domain Value:
Enumerated Domain Value Definition: A normal fault is a plane at which the hanging wall moves down
relative to the footwall (in other words, one body of rock slides down along the fault relative to
the other body of rock). The fault plane slopes downward in the direction of the hanging-wall.
Enumerated
Domain Value Definition Source: Consult http://eqseis.geosc.psu.edu/~cammon/HTML/
Classes/IntroQuakes/Notes/faults.html
Attribute:
Attribute Label: Notes
Attribute Definition: These are notes with important details about the fault, indicating the location of the down-
dropped block / hanging wall relative to the fault.
Attribute Definition Source: None
Attribute Domain Values:
Enumerated Domain:
Enumerated Domain Value: Down-dropped block is to the east of the fault.
Enumerated Domain Value Definition: This means what it says. The hanging-wall is the down-dropped
body of rock, which is to the east of the fault (on the side where the tick marks are on the map).
The body of rock to the east of the fault is moving down along the fault relative to the body of
rock to the west (the footwall).
Enumerated Domain Value Definition Source: Please see Mertzman (2008) and
http://eqseis.geosc.psu.edu/~cammon/HTML/Classes/IntroQuakes/Notes/faults.html
Enumerated Domain:
Enumerated Domain Value: Down-dropped block is to the west of the fault.
Enumerated Domain Value Definition: This means what it says. The hanging-wall is the down-dropped
body of rock, which is to the west of the fault (on the side where the tick marks are on the map).
The body of rock to the west of the fault is moving down along the fault relative to the body of
rock to the east (the footwall).
Enumerated Domain Value Definition Source: Please see Mertzman (2008) and
http://eqseis.geosc.psu.edu/~cammon/HTML/Classes/IntroQuakes/Notes/faults.html
Distribution Information
Metadata Reference Information
Metadata Date: 20080109
Metadata Contact:
Contact Information:
Contact Person Primary:
Contact Person: Isaac Weaver
Contact Position: Research Assistant
Contact Address:
Address Type: mailing and physical address
Address: Isaac Weaver,
City:
State or
Province:
Postal Code: 17604
Contact Voice Telephone: Unavailable
Contact Electronic Mail Address: iweaver@fandm.edu
Metadata Standard Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata Standard Version: Version 2 – 1998