Geologic Map of the La Grande Reservoir Quadrangle, Union County, Oregon

Citation:

Citation Information:

Originator: Oregon Department of Geology and Mineral Industries (DOGAMI)
Publication Date: 07/01/04
Publication Time: Unknown
Title: Geologic Map of the La Grande Reservoir Quadrangle, Union County, Oregon
Edition: Version 1.0
Geospatial Data Presentation Form: vector
Series Information:

Series Name: Open-File Report
Issue Identification: OFR O-04-06

Publication Information:

Publication Place: Portland, Oregon
Publisher: Oregon Department of Geology and Mineral Industries

Description:

Abstract:
The La Grande Reservoir quadrangle lies at the northern end of the Elkhorn Mountains in the Blue Mountain province of Eastern Oregon. Much of the study area is underlain by basaltic andesite flows of the Grande Ronde Basalt of the Columbia River Basalt Group (CRBG). These flows are difficult to distinguish in the field, and are principally divided into four magnetostratigraphic units based on paleomagnetic polarity, and about 17 flow groups defined by geochemistry. Many of the flows are so chemically similar that, even with chemical analysis, it is often not possible to assign a given sample to a specific flow unit with confidence. The first-order structure in the area is a gentle dip to the north, with the oldest rocks exposed at the south edge of the quadrangle and successively younger rocks exposed to the north. Two groups of faults are superimposed on this general trend. The northwest-trending Shaw Mountain fault zone traverses the southern half of the map, and the northern half of the map is cut by a second group of north-northwest-trending faults including the Peach Canyon and Graves Creek faults mapped on the Hilgard Quadrangle to the north.

The geologic record visible in the La Grande Reservoir quadrangle begins in the Oligocene with the eruption of andesite and dacite porphyry and deposition of volcaniclastic sediments of the Tower Mountain Volcanic Field. In the middle Miocene, eruption of Grande Ronde Basalt commenced from vents across northeastern Oregon and southeastern Washington, with numerous flows reaching the La Grande Reservoir quadrangle in succession. During the latter part of the middle Miocene, eruptions of the Powder River volcanic field commenced, from vents presumably to the east of the map area. by it.

During the Quaternary, the canyons cut by the major streams in the area began to expose the Oligocene volcanic rocks beneath the overlying Miocene volcanic rocks. As this happened, large landslides were initiated, with failure surfaces in the older volcaniclastic sedimentary rocks. During the Holocene, sand and gravel alluvium has been deposited in some of the canyons of the major streams in the area, along with some minor alluvial fans at the mouths of intermittent streams. In the latest Holocene, the eruption of Mt. Mazama in the southern Oregon Cascades deposited up to a half meter of air-fall ash over the entire region.

The La Grande Reservoir quadrangle has a low potential for mineral resources. Energy resources in the quadrangle are probably nil. The geology of the area is moderately conducive to developing significant groundwater resources. Geologic hazards likely to occur or reoccur in the area include landslides and earthquakes.

Purpose:
The digital geologic map database for the quadrangle has been created as a general-purpose data set that is applicable to land-related investigations in the earth and biological sciences. The quadrangle's database has been generated to further our understanding of bedrock and surficial processes at work in the region and to document evidence for seismotectonic activity in Oregon. The database is designed to serve as a base layer suitable for ecosystem and mineral resource assessment and for building a hydrogeologic framework for the basin(s) in which it occurs. The database is not suitable for site-specific geologic evaluations.
Supplemental Information:
The CD contains digital files with various map coverages created in MapInfo Professional version 7.0 (.tab) and a screen graphic of the map in Adobe PDF format. Digital map coverages are also provided 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, a discussion of the quadrangle's geologic history, and an assessment of the quadrangle's geologic hazards and resources. This data is not field-checked and comes with no guarantees as to its accuracy.
Time Period of Content:

Time Period Information:

Single Date/Time:

Calendar Date: 1997
Time of Day: Unknown

Currentness Reference: publication date

Status:

Progress: Complete
Maintenance and Update Frequency: None planned

Spatial Domain:

Bounding Coordinates:

West Bounding Coordinate: -118.25
East Bounding Coordinate: -118.125
North Bounding Coordinate: 45.25
South Bounding Coordinate: 45.125

Keywords:

Theme:

Theme Keyword Thesaurus: None
Theme Keyword: Earth science
Theme Keyword: Geology
Theme Keyword: Economic geology

Place:

Place Keyword Thesaurus: None
Place Keyword: United States
Place Keyword: Oregon
Place Keyword: North America
Place Keyword: Pacific Northwest
Place Keyword: Columbia River Basalt
Place Keyword: Grande Ronde Basalt
Place Keyword: John Day Formation
Place Keyword: Landslides
Place Keyword: Blue Mountains
Place Keyword: Powder River Volcanic Field
Place Keyword: La Grande Reservoir Quandrangle

Stratum:

Stratum Keyword Thesaurus: None

Temporal:

Temporal Keyword Thesaurus: None

Access Constraints: 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:
User should use caution when overlaying other data sets and should not make legally binding decisions from this data. These data are subject to change. Acknowledgment of the USGS/DOGAMI would be appreciated in products derived from these 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 the original map scale, collection methodology, currency of data, 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.

Data collected and interpreted at a scale of 1:24,000. Many lines and polygon boundaries inferred, accompanying traverse map and point data set (if provided) show where direct observations were made, areas without direct observations were completed with geologic inference and airphoto interpretation. Location error for observed features (chemical and paleomagnetic data points) have a +/- 20 m uncertainity. Polygon boundaries and line data typically have an additional 50 m uncertainity as to their actual location in the field, since most are not exposed.

Point of Contact:

Contact Information:

Contact Person Primary:

Contact Person: Ian P. Madin
Contact Organization: Oregon Department of Geology and Mineral Industries

Contact Position: Senior Mapping 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: 503/731/4100 ext. 241
Contact Facsimile Telephone: 503/731-4066
Contact Electronic Mail Address: ian.madin@state.or.us
Hours of Service: 8:00 a.m. to 5:00 p.m.

Browse Graphic:

Browse Graphic File Name: OFR O-04-06map
Browse Graphic File Description: Map showing extent and file names of map data
Browse Graphic File Type: pdf

Data Set Credit:
This map was produced as part of a cooperative program between the Oregon Department of Geology and Mineral Industries (DOGAMI) and the U.S. Geological Survey and is supported in part by the U.S.G.S. under assistance Award No. 1434-HQ-97-AG-01736. 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.
Security Information:

Security Classification System: None
Security Classification: None
Security Handling Description: None

Native Data Set Environment: MapInfo GIS .tab format, MapInfo Corp., Troy, NY.

Attribute Accuracy:

Attribute Accuracy Report: The accuracy of the attributes is unknown

Logical Consistency Report:
Spatial data is presented in the form of polygons and lines characterizing the geology only in the quadrangle. This dataset does not have topology. However, polygons were checked for misalignment errors such as slivers, overlaps, bow ties, splits, and missing nodes. Where found errors were corrected. The geology was delineated by the geologist on a 1:24,000, 7.5-minute USGS topographic quadrangle. 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.
Completeness Report:
The mapping project as originally designed has been completed for the quadrangle. The geology of the quadrangle is based on relationships gathered from outcrops, float, and rock exposure on foot or vehicle traverses. Many lines and polygon boundaries inferred, accompanying traverse map and point data sets show where direct observations were made, areas without direct observations were completed with geologic inference and airphoto interpretation. Location error for observed features +/- 20 m (chemical and paleomagnetic datapoints) polygon boundaries and line data typically have an additional 50 m uncertainty as to their actual location in the field, since most are not exposed. Unit properties are described in the text explanation. All geospatial database elements are attributed.
Positional Accuracy:

Horizontal Positional Accuracy:

Horizontal Positional Accuracy Report:
The data can't be more accurate than the USGS topographic quadrangle from which it was developed. Positional accuracy of geologic contacts vary based on the techiques and quality of mapping. Still the horizontal accuracy of the coverage should be regarded as unknown.
Vertical Positional Accuracy:

Vertical Positional Accuracy Report: Unknown

Lineage:

Source Information:

Source Citation:

Citation Information:

Originator: Oregon Department of Geology and Mineral Industries (DOGAMI)
Publication Date: 07/01/04
Publication Time: Unknown
Title: Geologic Map of the La Grande Reservoir Quadrangle, Union County, Oregon
Edition: Version 1.0
Geospatial Data Presentation Form: vector
Series Information:

Series Name: Open-File Report
Issue Identification: OFR O-04-06

Publication Information:

Publication Place: Portland, Oregon
Publisher: Oregon Department of Geology and Mineral Industries

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

Source Citation Abbreviation: OFR O-04-06

Process Step:

Process Description:
Field mapping and aerial photograph interpretation; iterative process.
Transfer of geologic linework and point data from field maps and aerial photographs to a scale-stable cartographic base of quadrangle

Description of Map Units and Correlation of Map Units

Polygons, lines, and points representing geologic features and data points were hand digitized from author-prepared base-stable geologic map at 1:24,000 scale.

The resultant coverages were attributed with data describing the geologic units, contacts, structures and point locations.

Draft check plots of the geologic map and explanation were created and submitted for peer review. 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: Unknown
Process Contact:

Contact Information:

Contact Person Primary:

Contact Person: Ian P. Madin
Contact Organization: Oregon Department of Geology and Mineral Industries

Contact Position: Senior Mapping 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: 503/731/4100 ext. 241
Contact Facsimile Telephone: 503/731-4066
Contact Electronic Mail Address: ian.madin@state.or.us
Hours of Service: 8:00 a.m. to 5:00 p.m.

Cloud Cover: Unknown

Direct Spatial Reference Method: Vector

Horizontal Coordinate System Definition:

Planar:

Grid Coordinate System:

Grid Coordinate System Name: Universal Transverse Mercator 1927
Universal Transverse Mercator:

UTM Zone Number: 10
Transverse Mercator:

Scale Factor at Central Meridian: 0.9996
Longitude of Central Meridian: -123
Latitude of Projection Origin: 0
False Easting: 500000
False Northing: 0

Planar Coordinate Information:

Planar Coordinate Encoding Method: Coordinate Pair
Coordinate Representation:

Abscissa Resolution: 0.001
Ordinate Resolution: 0.001

Planar Distance Units: meters

Geodetic Model:

Horizontal Datum Name: North American Datum of 1927
Ellipsoid Name: Clarke 1866
Semi-major Axis: 6378206
Denominator of Flattening Ratio: 294.9786982

Vertical Coordinate System Definition:

Altitude System Definition:

Altitude Datum Name: National Geodetic Vertical Datum of 1929
Altitude Distance Units: feet

Detailed Description:

Entity Type:

Entity Type Label: map_polygons
Entity Type Definition: Polygon features and attribute tables
Entity Type Definition Source: Oregon Department of Geology and Mineral Industries

Detailed Description:

Entity Type:

Entity Type Label: map_faults
Entity Type Definition: Polyline features and attribute tables
Entity Type Definition Source: Oregon Department of Geology and Mineral Industries

Overview Description:

Entity and Attribute Overview:
The digital map information contains polygon and polyline entities (map_polygons and map_faults). Items in the polygon attribute table are: polygon_id, unit_label, group_name, formation_name, member_name, informal_name, stratigraphic_age, unit_descriptioin, polarity, fossils, chemistry, and notes. Items in the polyline attribute table are: fault_id, trace_type, style, fault_name, side_down, attitude, and notes. For a description of the regional setting, resources, and hazards, in addition to information relating to the data entities and attributes, please see the text that accompanies this publication.
Entity and Attribute Detail Citation: CD contains Microsoft Excel files containing the geochemical data.

Overview Description:

Entity and Attribute Overview:
Entity labels for the digital map are map_polygons (polygons) and map_faults (polylines). Items in the polygon attribute table are: polygon_id, unit_label, group_name, formation_name, member_name, informal_name, stratigraphic_age, unit_descriptioin, polarity, fossils, chemistry, and notes. Items in the polyline attribute table are: fault_name, side_down, attitude, and notes. For a description of the regional setting, resources, and hazards, in addition to information relating to the data entities and attributes, please see the text that accompanies this publication.
Entity and Attribute Detail Citation: Oregon Department of Geology and Mineral Industries

Distributor:

Contact Information:

Contact Person Primary:

Contact Person: Donald Haines
Contact Organization: Nature of the Northwest Information Center

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 TDD/TTY Telephone: Unavailable
Contact Facsimile Telephone: 503/731-4066
Contact Electronic Mail Address: don.haines@state.or.us
Hours of Service: 8:00 a.m. to 4:30 p.m. Monday through Friday
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: Oregon Department of Geology and Mineral Industries Open-File Report OFR O-04-06
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:

Non-digital Form:
DOGAMI can make a paper copy of the report (printed B/W). Also, a color paper plot (34" x 44") of the OFR O-04-06 can be ordered through the Nature of the Northwest Information Center, a fee for the paper plot of $15 will be charged.
Fees: $15 for a color paper plot.
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
Standard Order Process:

Digital Form:

Digital Transfer Information:

Format Name: .tab
Format Version Number: MapInfo 7.0
Format Specification: Files for MapInfo
Format Information Content: PLEASE NOTE: conversion to shapefile format changes some characters ( # - .) to underscores; item names over 10 characters are truncated.
File Decompression Technique: None

Fees: $10 for CD
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
Custom Order Process: Contact The Nature of the Northwest Information Center by e-mail, phone, or letter explaining what products are needed.
Technical Prerequisites:
The digital map files are in vector form and are available in two formats:

(1) .tab - native file format of MapInfo GIS software package by MapInfo Corporation of Troy, New York.
(2) .shp - native file format of ArcView GIS software package by ESRI, Redlands, California.

Publication viewer files

Included on this CD is a text viewing file 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

Data viewing

Map data files can be viewed with a variety of software systems. For the vector map data, both program manufacturers currently offer viewer software that can be downloaded free:

http://www.esri.com/software/arcexplorer/index.html
http://www.mapinfo.com/software/proviewer/index.html

Metadata Date: 7/1/2004
Metadata Review Date: 7/1/2004
Metadata Future Review Date:
Metadata Contact:

Contact Information:

Contact Person Primary:

Contact Person: Clark Niewendorp
Contact Organization: Oregon Department of Geology and Mineral Industries

Contact Position: Cartographer
Contact Address:

Address Type: mailing and physical address
Address: 800 NE Oregon Street #5, Suite 965
City: Portland
State or Province: Oregon
Postal Code: 97232
Country: USA

Contact Voice Telephone: 503/731-4100 x219
Contact Facsimile Telephone: 503/731-4066
Contact Electronic Mail Address: clark.niewendorp@state.or.us
Hours of Service: 7:30 a.m. to 4:30 p.m. Monday through Friday

Metadata Standard Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata Standard Version: Version 2.0
Metadata Time Convention: local time
Metadata Access Constraints: None
Metadata Use Constraints: None
Metadata Security Information:

Metadata Security Classification System: None
Metadata Security Classification: Unclassified
Metadata Security Handling Description: None