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During the Pliocene to middle Pleistocene, pluvial lakes in the western Great Basin repeatedly rose to levels much higher than those of the well-documented late Pleistocene pluvial lakes, and some presently isolated basins were connected. Sedimentologic, geomorphic, and chronologic evidence at sites shown on the map indicates that Lakes Lahontan and Columbus-Rennie were as much as 70 m higher in the early-middle Pleistocene than during their late Pleistocene high stands. Lake Lahontan at its 1400-m shoreline level would submerge present-day Reno, Carson City, and Battle Mountain, and would flood other now-dry basins. To the east, Lakes Jonathan (new name), Diamond, Newark, and Hubbs also reached high stands during...
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This image contains a representation of the topographic relief in the area of the Green River Basin area. This area is a part of the National Coal Resource Assessment of the Northern Rocky Mountain and Great Plains Fort Union Coal Resources Assessment Area. This area can be shown in relation to other relevant themes of this area.
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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 Relief image of the Green River Basin Extent of Pleistocene Lakes in the Western Great Basin 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 Relief image of the Green River Basin Geologic map of the Seldovia quadrangle, south-centralAlaska Extent of Pleistocene Lakes in the Western Great Basin