Preliminary geology of the Linnton 7.5' quadrangle, Multnomah and Washington Counties, Oregon

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 Linnton 7.5' quadrangle, Multnomah and Washington Counties, Oregon
Edition: Version 1.0
Geospatial_Data_Presentation_Form: vector digital data
Series_Information:
Series_Name: Open File Report
Issue_Identification: OFR O-08-06
Publication_Information:
Publication_Place: Portland, Oregon
Publisher: Oregon Department of Geology and Mineral Industries
Online_Linkage: \\rocks\staff-public\Publications\NEW publications\FINAL COPY\OFR O-08-06 Linnton\for CD\gis\Shp\Linnton_Bedrock_Polygons_region.shp
Description:
Abstract:
This coverage contains the bedrock geology of the Linnton 7.5' quadrangle, Multnomah and Washington Counties, Oregon at 1:24,000-scale. The layer contains 11 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 files in the set include:  Linnton_Bedrock, Linnton_Faults, and Linnton_Surficial. The quadrangle is located in the northwestern portion of the Portland urban area in NW Oregon. For the Linnton 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 Linnton 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. 

Logs from Barber 1, an oil exploration well l in the map area, were interpreted and cutting samples from the well were geochemically analyzed (USGS, 2006) by Dr. Marvin Beeson and Mr. Terry Tolan. Data from this well was used in the preparation of the maps along with whole rock major and trace element geochemical analyses of approximately 74 samples of Columbia River Basalt and Boring volcanic field lavas.  Several additional analyses were contributed by Dr. Ray Wells and Dr. Russ Evarts of the USGS.
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 compilation-2008
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -122.881365
East_Bounding_Coordinate: -122.746339
North_Bounding_Coordinate: 45.627308
South_Bounding_Coordinate: 45.497364
Keywords:
Theme:
Theme_Keyword_Thesaurus: none
Theme_Keyword: Geologic map
Theme_Keyword: Earthquake hazards
Theme_Keyword: Bedrock geology
Theme_Keyword: Volcanic rocks
Theme_Keyword: Sedimentary rocks
Theme_Keyword: Volcanoes
Theme_Keyword: Volcanic flows
Theme_Keyword: Lava flows
Theme_Keyword: Volcanic center
Theme_Keyword: Geology
Theme_Keyword: Geologic map
Place:
Place_Keyword_Thesaurus: none
Place_Keyword: Oregon
Place_Keyword: Portland Urban Area
Place_Keyword: Linnton
Place_Keyword: Tualatin Mountains
Place_Keyword: Northwest Oregon
Place_Keyword: Washington County
Place_Keyword: Multnomah County
Place_Keyword: Barnes Road
Place_Keyword: Elk Point
Place_Keyword: Kaiser Road
Place_Keyword: Bonny Slope
Place_Keyword: Linnton USGS 7.5 minute quadrangle
Stratum:
Stratum_Keyword_Thesaurus: none
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:
contact via electronic mail is preferred
Browse_Graphic:
Browse_Graphic_File_Name: Linnton
Browse_Graphic_File_Type: PDF
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 GIS 9.1
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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The geology was delineated by the geologist on a 1:24,000, 7.5-minute USGS topographic quadrangle, except for the Boring volcanic field.  The Boring volcanic field was delineated using shaded relief images derived from LiDAR.  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.

Check plots of the map were reviewed by the mapper and cartographer for consistency with basic geologic principles and general conformity to USGS mapping standards. This data is not field-checked and is an interpretation of the mapper. No guarantees are provided as to its 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 Linnton quadrangle. 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_Citation:
Citation_Information:
Originator: U.S. Geological Survey
Title:
Linnton 7.5-minute quadrangle
Source_Scale_Denominator: 24000
Type_of_Source_Media: CD-ROM
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: unknown
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 1758 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
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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: 25
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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
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Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: Linnton_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:
Attribute:
Attribute_Label: Shape
Attribute_Definition:
Feature geometry.
Attribute_Definition_Source:
ESRI
Attribute_Domain_Values:
Attribute:
Attribute_Label: UNIT
Attribute_Definition:
Unit identification code
Attribute_Definition_Source:
Oregon Department of Geology and Mineral Industries
Attribute_Domain_Values:
Unrepresentable_Domain:
Coordinates defining the features.
Overview_Description:
Entity_and_Attribute_Overview:
This dataset has a polygon entity and attributes.

For a description of the structural geology, in addition to information relating to the data entities and attributes, please see the text that accompanies this publication.

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

Miocene-Pleistocene Volcanic and Fluvial Sedimentary Rocks
Boring volcanic field
  QTbb = Basaltic andesite of Bonny Slope
  Qbae = Basaltic andesite of Elk Point
  Qbab = Bascalti andesite of Barnes Road
  Qbk = Basalt of Kaiser Road
Th = Hillsboro Formation
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 decription of attributes, see O-08-06print.pdf
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Nature of the Northwest Information Center
Contact_Person: Donald 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-08-06_onscreen.pdf and O-08-06_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-08-06Map.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: LinntonSampleChem.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 Linnton 7.5' Quadrangle, Multnomah and Washington Counties, Oregon: Open-File Report O-08-06 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: 0.100
Ordering_Instructions:
Ordering capability is available through Nature of the Northwest Information Center, 800 NE Oregon Street #5, Portland, Oregon 97232, (503) 872-2750 and a publication list is viewable at: http:/www.naturenw.org
Turnaround: 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
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Metadata_Reference_Information:
Metadata_Date: 20080528
Metadata_Review_Date: 2008
Metadata_Future_Review_Date: none
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Oregon Department of Geology and Mineral Industries
Contact_Person: Clark Niewendorp
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 5:00 p.m
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
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