Geologic Map and Map Database of Eastern Sonoma and Western Napa Counties, California

Graymer, R. W.; Brabb, E. E.; Jones, D. L.; Barnes, J.; Nicholson, R. S.; Stamski, R. E.

Abstract:

Introduction This report contains a new 1:100,000-scale geologic map, derived from a set of geologic map databases (Arc-Info coverages) containing information at 1:62,500-scale resolution, and a new description of the geologic map units and structural relations in the map area. Prepared as part of the San Francisco Bay Region Mapping Project, the study area includes the north-central part of the San Francisco Bay region, and forms the final piece of the effort to generate new, digital geologic maps and map databases for an area which includes Alameda, Contra Costa, Marin, Napa, San Francisco, San Mateo, Santa Clara, Santa Cruz, Solano, and Sonoma Counties. Geologic mapping in Lake County in the north-central part of the map extent was not within the scope of the Project. The map and map database integrates both previously published reports and new geologic mapping and field checking by the authors (see Sources of Data index map on the map sheet or the Arc-Info coverage eswn-so and the textfile eswn-so.txt). This report contains new ideas about the geologic structures in the map area, including the active San Andreas Fault system, as well as the geologic units and their relations. Together, the map (or map database) and the unit descriptions in this report describe the composition, distribution, and orientation of geologic materials and structures within the study area at regional scale. Regional geologic information is important for analysis of earthquake shaking, liquifaction susceptibility, landslide susceptibility, engineering materials properties, mineral resources and hazards, as well as groundwater resources and hazards. These data also assist in answering questions about the geologic history and development of the California Coast Ranges.

Genre:

USGS Numbered Series

ProdID:

79815

Citation Author:

Graymer, R. W.; Brabb, E. E.; Jones, D. L.; Barnes, J.; Nicholson, R. S.; Stamski, R. E.

Citation Contributing Office:

Western Earth Surface Processes

Citation Datum:

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Citation Edition:

Version 1.0

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Citation Language:

ENGLISH

Citation Larger Work Title:

Citation LatN:

0385230

Citation LatS:

0381500

Citation LonE:

-1211500

Citation LonW:

-1224500

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Citation Phsyical Description:

Map (35 x 50 inches); Pamphlet (ii, 28 p.); Read Me; Data Files

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Citation Publisher:

Geological Survey (U.S.)

Citation Series:

Scientific Investigations Map

Citation Series Code:

SIM

Citation Series Number:

2956

Citation Search Results Text:

Geologic Map and Map Database of Eastern Sonoma and Western Napa Counties, California; 2007; SIM; 2956; Graymer, R. W.; Brabb, E. E.; Jones, D. L.; Barnes, J.; Nicholson, R. S.; Stamski, R. E.

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Citation Year:

2007

Type:

citation/reference

Text:

Geologic Map and Map Database of Eastern Sonoma and Western Napa Counties, California; 2007; SIM; 2956; Graymer, R. W.; Brabb, E. E.; Jones, D. L.; Barnes, J.; Nicholson, R. S.; Stamski, R. E.