Service Description: This work converts an earlier work into the required format for inclusion in the National Geologic Map Database. The original work makes the Quaternary deposits elements contained in the source reports available as a single, areally continuous digital map. The original mapping of the deposits was directed at providing a geologic framework for assessing the liquefaction susceptibility of surficial deposits in the San Francisco Bay region, but at the same time created what is still the best representation of Quaternary deposits in the region.
NOTE: These data had a horizontal (95 m) and vertical (7.5 m) offset from other known data sources. This was resolved by changing the false easting to 500095 and the false northing to 7.4. The data were also reprojected in California State Plane Zone III NAD 83. The data were downloaded here: https://www.sciencebase.gov/catalog/item/6500a888d34ed30c2057f94a
Service ItemId: 94ac8d800c9c49df9c329ef36aced8ce
Has Versioned Data: false
Max Record Count: 2000
Supported query Formats: JSON
Supports applyEdits with GlobalIds: False
Supports Shared Templates: False
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Description: This is a conversion of Wentworth and others (2023)[DAS1] to the Geologic Map Schema (GeMS) for inclusion in the National Geologic Map Database. The original publication was in the Alacarte schema commonly used for geologic map databases prior to the release of the now mandatory GeMS. The GIS layers in this release have the same scientific content as the source data release. The source data release lacks description of map units, however, so those have been copied verbatim from the two principal sources for that work (Witter and others, 2006 [DAS2]; Knudsen and others, 2000 [DAS3]).
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Spatial Reference: 102643 (2227)
Initial Extent:
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YMin: 1869791.82455409
XMax: 6243161.98331755
YMax: 1873732.5454166
Spatial Reference: 102643 (2227)
Full Extent:
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YMin: 1774563.69772775
XMax: 6397905.71350604
YMax: 2520686.24850192
Spatial Reference: 102643 (2227)
Units: esriFeet
Child Resources:
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Supported Operations:
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ConvertFormat
Get Estimates