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Open-File Report O-12-02, Lidar-based surficial geologic map and database of the greater Portland, Oregon, area, Clackamas, Columbia, Marion, Multnomah, Washington, and Yamhill Counties, Oregon, and Clark County, Washington, by Lina Ma, Ian P. Madin, Serin Duplantis, and Kendra J. Williams
CD-ROM contains 30-page text report PDF, 1:63,360-scale thematic map plate PDF (59 x 45 inches), and an Esri ArcGIS® version 10.0 geodatabase.
Since 2003 the Oregon Department of Geology and Mineral Industries (DOGAMI) has been working with the U.S. Geological Survey (USGS) to develop modern digital geologic maps of the greater Portland urban area in Oregon. The maps are needed to support earthquake and landslide hazard and risk studies for the region. USGS work has focused west of the Tualatin Mountains, and DOGAMI work has focused to the east. The eventual goal of the collaborative project is a published digital geologic map and database and an accompanying paper map covering 54 quadrangles in Oregon and Washington.
An additional part of the project is the development by DOGAMI of a detailed surficial geologic map and a three-dimensional geologic model describing important geotechnical parameters. This report is an interim product on the way to a final three-dimensional model and a regional geologic map.
Our understanding of the regional geologic framework continues to evolve as regional mapping is completed. We are publishing the spatial database with sparse geologic unit descriptions in order to ensure that this detailed mapping is available in a timely manner. This publication includes a thematic map derived from the detailed work to provide the general public with a more easily understood description of the dynamic surficial processes at work in the area. We expect that the regional geologic map will provide a far more detailed and comprehensive description of units and discussion of structure, stratigraphic relationships, geochemistry, geochronology, and geologic history of the area.
The spatial database is provided in the form of a geodatabase for Esri ArcGIS® versions 9.3 and 10.0. Metadata are embedded in the geodatabase.
Thematic map plate (actual size 59 x 45 inches, scale 1:63,360):