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USGS Open-File Report 99-18B is a digital representationof a paper map that is being released simultaneously, USGSOpen-File Report 99-18A. The map shows the bedrockgeology of the Seldovia quadrangle, Alaska, at a scale of1:250,000, compiled from new mapping (1988-1993) andpublished sources. Digital files include various mapcoverages in Arc/Info export format, and a picture of themap plus all map-collar information in Adobe Illustratorand PDF formats. The map collar includes detailedmap-unit descriptions, text on the physiography,neotectonics, geologic history, and economic geology,cross-section, correlation of map units chart, and mapshowing original sources of information.
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This digital map database, compiled from previously published andunpublished data, and new mapping by the authors, represents thegeneral distribution of bedrock and surficial deposits in San MateoCounty. Together with the accompanying text, it provides currentinformation on the geologic stucture and stratigraphy of the areacovered. The database delineates map units that are identified bygeneral age and lithology following the stratigraphic nomenclatureof the U.S. Geological Survey. The scale of the source maps limitsthe spatial resolution (scale) of the database to 1:62,500 or smaller.


    map background search result map search result map Geology of the onshore part of San Mateo County, California: A digital database Geologic map of the Seldovia quadrangle, south-centralAlaska Geology of the onshore part of San Mateo County, California: A digital database Geologic map of the Seldovia quadrangle, south-centralAlaska