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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 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 Extent of Pleistocene Lakes in the Western Great Basin Geology of the onshore part of San Mateo County, California: A digital database Geology of the onshore part of San Mateo County, California: A digital database Extent of Pleistocene Lakes in the Western Great Basin