Geology of the Cape Mendocino, Eureka, Garberville, and Southwestern Part of the Hayfork 30 x 60 Minute Quadrangles and Adjacent Offshore Area, Northern California

McLaughlin, Robert J.; Ellen, S. D.; Blake, M. C., Jr.; Jayko, Angela S.; Irwin, W. P.; Aalto, K. R.; Carver, G. A.; Clarke, S. H., Jr.
Digital Database by Barnes, J. B.; Cecil, J. D.; Cyr, K. A.

Abstract:

Introduction These geologic maps and accompanying structure sections depict the geology and structure of much of northwestern California and the adjacent continental margin. The map area includes the Mendocino triple junction, which is the juncture of the North American continental plate with two plates of the Pacific ocean basin. The map area also encompasses major geographic and geologic provinces of northwestern California. The maps incorporate much previously unpublished geologic mapping done between 1980 and 1995, as well as published mapping done between about 1950 and 1978. To construct structure sections to mid-crustal depths, we integrate the surface geology with interpretations of crustal structure based on seismicity, gravity and aeromagnetic data, offshore structure, and seismic reflection and refraction data. In addition to describing major geologic and structural features of northwestern California, the geologic maps have the potential to address a number of societally relevant issues, including hazards from earthquakes, landslides, and floods and problems related to timber harvest, wildlife habitat, and changing land use. All of these topics will continue to be of interest in the region, as changing land uses and population density interact with natural conditions. In these interactions, it is critical that the policies and practices affecting man and the environment integrate an adequate understanding of the geology. This digital map database, compiled from previously published and unpublished data, and new mapping by the authors, represents the general distribution of bedrock and surficial deposits in the mapped area. Together with the accompanying text file (ceghmf.ps, ceghmf.pdf, ceghmf.txt), it provides current information on the geologic structure and stratigraphy of the area covered. The database delineates map units that are identified by general age and lithology following the stratigraphic nomenclature of the U.S. Geological Survey. The scale of the source maps limits the spatial resolution (scale) of the database to 1:100,000 or smaller.

Genre:

USGS Numbered Series

ProdID:

69291

Citation Author:

McLaughlin, Robert J.; Ellen, S. D.; Blake, M. C., Jr.; Jayko, Angela S.; Irwin, W. P.; Aalto, K. R.; Carver, G. A.; Clarke, S. H., Jr. Digital Database by Barnes, J. B.; Cecil, J. D.; Cyr, K. A.

Citation Contributing Office:

USGS Western Earth Surface Processes

Citation Datum:

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Citation Edition:

Online Version 1.0.

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Citation Language:

ENGLISH

Citation Larger Work Title:

Citation LatN:

0410000

Citation LatS:

0400000

Citation LonE:

-1230000

Citation LonW:

-1250000

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Citation Phsyical Description:

Packages; Individual Files (Pamphlet [29 p.] & 6 Map Sheets [Sheet 1: 43 x 28 inches, Sheets 2 & 3: 35 x 28 inches, Sheet 4: 34 x 50 inches, Sheet 5: 69 x 43 inches, Sheet 6: 48 x 43 inches]); Database

Citation Projection:

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Citation Publisher:

Geological Survey (U.S.)

Citation Series:

Miscellaneous Field Studies Map

Citation Series Code:

Citation Series Number:

2336

Citation Search Results Text:

Geology of the Cape Mendocino, Eureka, Garberville, and Southwestern Part of the Hayfork 30 x 60 Minute Quadrangles and Adjacent Offshore Area, Northern California; 2000; MF; 2336; McLaughlin, Robert J.; Ellen, S. D.; Blake, M. C., Jr.; Jayko, Angela S.; Irwin, W. P.; Aalto, K. R.; Carver, G. A.; Clarke, S. H., Jr. Digital Database by Barnes, J. B.; Cecil, J. D.; Cyr, K. A.