Preliminary Geology of the Dixie Mountain 7.5' quadrangle, Columbia, Multnomah and Washington Counties, Oregon

Metadata also available as

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Oregon Department of Geology and Mineral Industries
Publication_Date: 2008
Publication_Time: Unknown
Title:
Preliminary Geology of the Dixie Mountain 7.5' quadrangle, Columbia, Multnomah and Washington Counties, Oregon
Edition: Version 1
Geospatial_Data_Presentation_Form: vector digital data
Series_Information:
Series_Name: Open File Report
Issue_Identification: O-08-07
Publication_Information:
Publication_Place: Portland
Publisher: Oregon Department of Geology and Mineral Industries
Online_Linkage:
\\rocks\staff-public\Publications\NEW publications\FINAL COPY\OFR O-08-07 Dixie Mtn\for CD\gis\Shp\Dixie_Mtn_Bedrock_Polygons_region.shp
Description:
Abstract:
This coverage contains the bedrock geology of the Dixie Mountain 7.5' quadrangle, Columbia, Multnomah and Washington Counties, Oregon at 1:24,000-scale as part of the Oregon Department Geology and Mineral Industries (DOGAMI) earthquake reduction program. The layer contains 7 separate map units representing volcanic and sedimentary rocks. This file is one in a set of four files which are provided to the user in two formats: MapInfo .tab and ESRI .shp format files. The other three map files in the set include: Dixie_Mtn_Faults, Dixie_Mtn_Folds, and Dixie_Mtn_Surficial. The quadrangle is located in the northwestern portion of the Portland urban area in NW Oregon. For the Dixie Mountain quadrangle, we have chosen to present two maps: a bedrock map that shows only the bedrock geology inferred to extend beneath the surficial deposits, and a companion map that shows only the surficial deposits.
Purpose:
The purpose of the project is to improve geologic mapping in the Portland urban area in order to better understand earthquake hazards. This coverage represent the most up-to-date, digital geology coverage currently available for the Dixie Mountain quadrangle.
Supplemental_Information:
The CD contains digital files with various map coverages created in MapInfo Professional version 9.1 (.tab) and a screen graphic of the map in Adobe PDF format. Digital map coverages are also provided as ArcView version 3.3 Shapefile (.shp) format for ESRI users. Accompanying the screen graphic of the map, is a text file (pdf format) describing the map units along with a discussion of the quadrangle's structural history. This digital data is not field-checked and comes with no guarantees as to its accuracy.

The geologic map was prepared using a variety of data sources, which were digitally integrated with MapInfotm GIS software . The primary sources of data were 330 field observations in natural and man-made exposures. The second major source of data were the logs of over 600 approximately-located water and engineering borings in and adjacent to the quadrangle. Eleven oil and gas stratigraphic or exploratory wells were drilled in the quadrangle in 1925, 1956 and 1957, and logs of these wells were also sources of data.

Cuttings from several wells in the map area were analyzed geochemically and interpreted (USGS, 2006) by Dr. Marvin Beeson and Mr. Terry Tolan. Together with whole rock, major and trace element geochemical analyses of approximately 59 samples of Columbia River Basalt, they were used to help define volcanic units.

Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2008
Time_of_Day: unknown
Currentness_Reference: Field work conducted in 2006 and 2007, data compliation-2008
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -123.006654
East_Bounding_Coordinate: -122.871063
North_Bounding_Coordinate: 45.752432
South_Bounding_Coordinate: 45.622234
Keywords:
Theme:
Theme_Keyword_Thesaurus: none
Theme_Keyword: Geology
Theme_Keyword: Geologic map
Theme_Keyword: Bedrock geology
Theme_Keyword: Earthquake hazards
Theme_Keyword: Volcanic rocks
Theme_Keyword: Sedimentary rocks
Theme_Keyword: Volcanic flows
Theme_Keyword: Lava flows
Place:
Place_Keyword_Thesaurus: none
Place_Keyword: Oregon
Place_Keyword: Portland Urban Area
Place_Keyword: Dixie Mountain
Place_Keyword: Tualatin Mountains
Place_Keyword: Northwest Oregon
Place_Keyword: Columbia County
Place_Keyword: Multnomah County
Place_Keyword: Washington County
Place_Keyword: Dixie Mountain 7.5 minute quadrangle
Temporal:
Temporal_Keyword_Thesaurus: none
Access_Constraints:
None. Restrictions and legal prerequisites for using the data set after use is granted. These include any access constraints applied to assure the protection of privacy or intellectual property, and any special restrictions or limitations on using the data set. For example: Maps in this publication depict bedrock and surficial geology. The maps cannot serve as a substitute for site-specific investigations by qualified practitioners. Site-specific data may give results that differ from those shown on the maps. Public access - Purchased at a nominal fee. To ensure distribution of the most current public information, please refer requests for data to the Nature of the Northwest.
Use_Constraints:
DOGAMI makes no warranty as to the currency, completeness, accuracy or utility of any specific data. This disclaimer applies both to individual use of the data and aggregate use with other data. It is strongly recommended that careful attention be paid to the contents of the metadata file associated with these data. User should use caution when overlaying other data sets and should not make legally binding decisions from this data. Any person using the information presented here should fully understand the data collection and compilation process before beginning their analysis/use. The burden of determining fitness for use lies with the user.

To avoid the risk of misinterpretation, invalid results, and erroneous conclusions, the users must consider original map scale, collection methodology, and any other conditions specific to every data element and each dataset as a whole. Potential users are advised to consult with DOGMAI to gain an understanding of the inherent limitations of this data set and its scope of inference. Also, the user must be aware that errors and conditions originating from physical sources involved in developing a dataset may be reflected in the data, and that the digital processing performed during preparation, storage, and transmission of the dataset may have exacerbated such errors and/or introduced additional ones.

Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Ian P. Madin
Contact_Organization: Oregon Department of Geology and Mineral Industries
Contact_Position: Chief Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 800 NE Oregon Street #28
City: Portland
State_or_Province: Oregon
Postal_Code: 97232
Country: USA
Contact_Voice_Telephone: 971-673-1542
Contact_Electronic_Mail_Address: ian.madin@state.or.us
Hours_of_Service: 8:00 a.m. to 4:30 p.m.
Contact_Instructions: email contact is preferred
Data_Set_Credit:
This research was supported by the U.S. Geological Survey (USGS), Department of the Interior, under USGS award number 03HQAG0013. The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the U.S. Government.

The Oregon Department of Geology and Mineral Industries created and maintains the spatial data sets. Credit should always be given to the data source and/or originator when the data is transferred or printed.

Native_Data_Set_Environment:
Microsoft Windows 2000 Version 5.2 (Build 3790) Service Pack 2; ESRI ArcCatalog 9.2.5.1450; MapInfo Pro 9.1

Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The geology was delineated by the geologist on a digital raster graphics' 1:24,000, 7.5-minute USGS topographic quadrangle (DRG). Geologic contacts should be considered as approximate. Prior to release of map-on-demand files and metadata, the author was given final digital data sets and paper plots for checking against the source map(s) to verify the linework and attributes. Also, the author was asked to check the metadata and accompanying files for completeness and accuracy.
Logical_Consistency_Report:
All polygons are closed and each polygon has one unique label; matching labels/polygons. In MapInfo Pro 9.1, the polygons were checked for polygon closure, erroneous or duplicate polygons, incorrect intersections, overshoots and undershoots (slivers and overlap), and node errors. Where found errors were corrected.
Completeness_Report:
Spatial data is presented in the form of polygons characterizing the bedrock geology of the Dixie Mountain quadrangle. All polygons are fully attributed. The bedrock geology maps from which the contacts, faults, and folds in these data sets were derived show the rock units that crop out at the surface or that are present beneath the soil or beneath relatively thin surficial deposits. The contacts of the soils themselves, or of surficial deposits such as alluvium and colluvium, are not included in the bedrock map.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Horizontal positional accuracy of this data with respect to the source map was verified by hard-copy plots.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report: unknown
Lineage:
Source_Information:
Source_Scale_Denominator: 24000
Type_of_Source_Media: computer program
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2008
Time_of_Day: unknown
Source_Currentness_Reference: publication date
Process_Step:
Process_Description:
The geologic map was prepared using a variety of data sources, which were digitally integrated with MapInfo GIS software. The primary sources of data were field observations in natural and man-made exposures. Over 200 observations were recorded digitally in the field using a Fujitsu Pencentra tablet computer running ESRI Arcpad software. The field observations were located using a GPS unit linked to the Pencentratm, which allowed display of the GPS location on an DRG image of the 7½ minute topographic quadrangle map, allowing easy confirmation of the GPS position.
Process_Date: 2008
Process_Step:
Process_Description:
The second major source of data was the logs of over 600 approximately-located water and engineering borings in the quadrangle. Borings were located by comparing owner, taxlot and address information on digital images of the logs (available online through the Oregon Water Resources Department) with ownership, address and taxlot information contained in the digital taxlot database for the area. Horizontal and vertical location errors were estimated for each located well and entered into the database. A limited number of wells were located in the field with GPS, for the remainder there was no field check performed.
Process_Date: 2008
Process_Step:
Process_Description:
Polygons geologic features and data points were hand digitized. The resultant coverages were attributed with data describing the geologic units, contacts, structures and point locations.
Process_Date: 2008
Process_Step:
Process_Description:
Draft check plots of the geologic map and explanation were created and submitted for peer review; description of Map Units and Correlation of Map Units finalized. Revisions were made to the geospatial database as needed. Prior to release of map-on-demand files and metadata, the author was given final digital data sets and paper plots for checking against the source map(s) to verify the linework and attributes. Also, the author was asked to check the metadata and accompanying files for completeness and accuracy.
Process_Date: 2008
Cloud_Cover: unknown

Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: G-polygon
Point_and_Vector_Object_Count: 51

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: Lambert Conformal Conic
Lambert_Conformal_Conic:
Standard_Parallel: 43.000000
Standard_Parallel: 45.500000
Longitude_of_Central_Meridian: -120.500000
Latitude_of_Projection_Origin: 41.750000
False_Easting: 1312335.958000
False_Northing: 0.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.000000
Ordinate_Resolution: 0.000000
Planar_Distance_Units: Foot (International)
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic_Reference_System_of_1980
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.257222

Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: Dixie_Mtn_Bedrock_Polygons_region
Entity_Type_Definition:
Polygon features and attribute table of rock units as they occur on the surface and below the surficial cover.
Entity_Type_Definition_Source: Oregon Department of Geology and Mineral Industries
Attribute:
Attribute_Label: FID
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: Shape
Attribute_Definition: Feature geometry.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Coordinates defining the features.
Attribute:
Attribute_Label: UNIT
Attribute_Definition: Unit identification code
Attribute_Definition_Source: Oregon Department of Geology and Mineral Industries
Overview_Description:
Entity_and_Attribute_Overview:
This dataset has a polygon entity and attributes.

In the data set for bedrock units, the entity type is a geologic unit as shown on the Dixie Mountain bedrock map (this publication), while names (Member, Formation and Unit) are described in accompanying report. Each geologic unit consists of an abbrevation beginning with time correlation (but not always) and letters for genetic rock type.

The classification scheme for the field called "Unit" is a simple classification of single units, as follows:

Miocene-Pleistocene Fluvial Sedimentary Rocks Troutdale Formation Ttg = Conglomerate and sandstone unit Neogene Volcanic Rocks and Older Sedimentary Rocks Columbia River Basalt Group Wanapum Basalt Frenchman Springs Member Twfs = Basalt of Sand Hollow Grande Ronde Basalt Member of Sentinel Bluffs Tgsb = Basalt of McCoy Canyon Member of Winter Water Tgww = Basalt of Winter Water Member of Ortley Tgo = Basalt of Ortley Scappoose Formation Ts = Marine sandstone unit

Entity_and_Attribute_Detail_Citation:
For complete description of attributes (bedrock units), see O-08-07print.pdf

Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Nature of the Northwest
Contact_Person: Don Haines
Contact_Position: Manager
Contact_Address:
Address_Type: mailing and physical address
Address: 800 NE Oregon Street #5
City: Portland
State_or_Province: Oregon
Postal_Code: 97232
Country: USA
Contact_Voice_Telephone: 503-872-2750
Contact_Facsimile_Telephone: 503-731-4066
Contact_Electronic_Mail_Address: don.haines@state.or.us
Hours_of_Service: 9:00 a.m. to 5:00 p.m.
Contact_Instructions:
Contact Nature of the Northwest Information Center by e-mail, phone, or letter explaining what products are needed.

All DOGAMI publications, both in and out of print, are available for inspection at the Department's offices (most reports "on file" are in the Portland office only) and at many state-document depository libraries in Oregon, including most Oregon college and university libraries. Publications are also available via interlibrary loan from the Oregon State Library, State Library Building, Salem, OR 97310.

Resource_Description:
Along with a readme file, the CDROM contains:

1. complete explanatory text in PDF format in two file sizes, one suitable for onscreen viewing and one suitable for high-quality printing ( O-08-07_onscreen.pdf and O-08-07_print.pdf).

To view the text: The text file is in Adobe Acrobat portable document format (.pdf). A free Adobe Acrobat Reader can be obtained from Adobe Systems Inc., San Jose, CA. <http://www.adobe.com>.

2. map_sheets folder containing O-08-07Map.pdf: 36 by 60 inch sheet.

3. metadata folder: Metadata is a documentation of the spatial map (GIS) data and is provided in three file formats: .htm, .txt, and .xml.

4. geochemistry folder: DixieMtnSampleChem.xls.

5. gis folder: The digital map files are available in two formats: shp - native file format of ESRI ArcGIS software by ESRI, Redlands, California.

Free viewer software can be downloaded from <http://www.esri.com/software/arcexplorer/index.html> and .tab - native file format of MapInfo GIS software by MapInfo Corporation of Troy, New York. You can download the free ProViewer software from <http://www.mapinfo.com/software/proviewer/index.html>. MapInfo Files Readme: The MapInfo files that were used in the creation of the Preliminary Geologic Map of the Dixie Mountain 7.5' Quadrangle, Columbia, Multnomah and Washington Counties, Oregon: Open-File Report O-08-07 have been included on this CD. All of these MapInfo files are contained within the folder named "tab". ArcGIS Files Readme: An ArcMap file (ERSI) has been included on this CD and contains shapefiles (.shp) of the bedrock and surficial units; contacts (unit boundaries); samples; fold, and faults found on this quadrangle. The shapefiles were created by conversion of the MapInfo files mentioned above. All of these ESRI files are contained within the folder named "shp".

Distribution_Liability:
No warranty, expressed or implied is made regarding the accuracy or utility of the data described and/or contained herein, nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and aggregate use with other data. It is strongly recommended that careful attention be paid to the contents of the metadata file associated with these data. The Oregon Department of Geology and Mineral Industries shall not be held liable for improper or incorrect use of these data. This information may be updated without notification.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Transfer_Size: 0.389
Fees: $15
Ordering_Instructions:
DOGAMI can make a paper copy of the report (printed B/W). Also, a color paper plot (36" x 60") of OFR O-08-07 can be ordered through the Nature of the Northwest Information Center, a fee for the paper plot of $15 will be charged.
Turnaround: First Class U.S. mail
Custom_Order_Process:
Contact The Nature of the Northwest Information Center by e-mail, phone, or letter explaining what products are needed.
Technical_Prerequisites:
Personal computer with Geographic Information System data viewing software.
Available_Time_Period:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2008
Time_of_Day: unknown

Metadata_Reference_Information:
Metadata_Date: 20080527
Metadata_Review_Date: 2008
Metadata_Future_Review_Date: none
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Clark Niewendorp
Contact_Organization: Oregon Department of Geology and Mineral Industries
Contact_Position: Mineral Resources Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 800 NE Oregon Street #28
City: Portland
State_or_Province: Oregon
Postal_Code: 97232
Country: USA
Contact_Voice_Telephone: 971-673-1540
Contact_Electronic_Mail_Address: clark.niewendorp@state.or.us
Hours_of_Service: 8:00 a.m. to 4:30 p.m.
Contact_Instructions: email contact preferred
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
Metadata_Access_Constraints: none
Metadata_Use_Constraints: none
Metadata_Extensions:
Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
Profile_Name: ESRI Metadata Profile

Generated by mp version 2.8.6 on Tue May 27 07:58:51 2008