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unpublished data, and new mapping by the authors, represents the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 (skmf.txt, skmf.pdf, or
skmf.ps), 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 1:24,000 or
smaller.
This database and accompanying plot files depict the distribution of
geologic materials and structures at a scale of 1:24,000. The
report is intended to provide geologic information for the regional study
of materials properties, earthquake shaking, landslide potential,
mineral hazards, seismic velocity, and earthquake faults. In addition,
the report contains new information and interpretations about the
regional geologic history and framework. However, the regional scale
of this report does not provide sufficient
detail for site development purposes. In addition, this map does not
take the place of fault-rupture hazard zones designated by the
California State Geologist (Hart and Bryant, 1997). Similarly, the
database cannot be used to accurately identify or delineate landslides in
the region.
This report consists of a set of geologic map database files (Arc/Info
coverages) and supporting text and plotfiles. In addition, the report
includes two sets of plotfiles (PostScript and PDF format) that will
generate map sheets and pamphlets similar to a traditional USGS
Miscellaneous Field Studies Report. These files are described below:
ARC/INFO Resultant Description of Coverage
export file Coverage
----------- ----------- --------------------------------
sk-geol.e00 sk-geol/ Polygon and line coverage showing
faults, depositional contacts, and
rock units in the map area.
sk-strc.e00 sk-strc/ Point and line coverage showing
strike and dip information and fold axes.
sk-lnds.e00 sk-lnds/ Point and line coverage showing arrows
indicating landslide directions as well
as the locations of wells and springs
not included in the topographic base map.
ASCII text files, including explanatory text, ARC/INFO key files,
PostScript and PDF plot files, and a ARC Macro Language file for
conversion of ARC export files into ARC coverages:
skmf.ps A PostScript plot file of the pamphlet
containing detailed unit descriptions
and geological information, a description
of the digital files associated with the
publication, plus references cited.
skmf.pdf A PDF version of mamf.ps.
skmf.txt A text-only file containing an unformatted
version of skmf.ps.
import.aml ASCII text file in ARC Macro Language to
convert ARC export files to ARC coverages
in ARC/INFO.
skmap.ps A PostScript plottable file containing
an image of the geologic map and base
maps at a scale of 1:24,000, along with
a simple map key.
skmap.pdf A PDF file containing an image of the
geologic map and base maps at a scale
of 1:24,000, along with a simple map key.
Base maps
Base Map layers used in the preparation of the geologic map plotfiles
were derived from published digital maps (Aitken, 1997). The base
map digital files are not included in the digital database package.
Other_References_Cited:
Barron, J.A., 1976, Marine diatom and silicoflagellate biostratigraphy
of the type Delmontian Stage and the type Bolivina obliqua Zone,
California: U.S. Geological Survey Journal of Research, v. 4, no. 3, p.
339-351.
Bowen, O.E., Jr., 1965, Stratigraphy, structure, and oil possibilities
in Monterey and Salinas quadrangles, California, in Rennie, E.W. Jr., ed.,
Symposium of papers presented at the fortieth annual Pacific Section
A.A.P.G. convention: American Association of Petroleum Geologists, Pacific
Section, Bakersfield, Calif., p. 48-67.
_____[1969], Geologic map of the Spreckels 7.5-minute quadrangle:
California Division of Mines and Geology unpublished map, scale 1:24,000.
Bryant, W.A., 1985, Faults in the southern Monterey Bay area, Monterey
County, California: California Division of Mines and Geology Fault
Evaluation Report FER-167, 13 p., 5 map sheets, scale 1:24,000.
Cassell, G.K., 1949, Variation in the Monterey Formation near the type
locality: Stanford, Calif., Stanford University M.S. thesis.
Clark, J.C., Dupré, W.R., and Rosenberg, L.I., 1997, Geologic map of
the Monterey and Seaside 7.5-minute quadrangles, Monterey County,
California: a digital database: U.S. Geological Survey Open-File Report
97-30, 32 p., 2 sheets, scale 1:24,000.
Cotton, William, and Associates, 1983, Preliminary geotechnical
evaluation, San Benancio Canyon landslide, Monterey County, California:
unpublished report to Monterey County Department of Public Works, 3 p.
Curry, R.R., 1984, Observations on Quaternary and recent fault activity,
central coastal California: Monterey Peninsula Water Management District
open-file report, 11 p.
Dibblee, T.W., Jr., 1973, Geologic map of the Salinas 15-minute
quadrangle, Monterey County, California: U.S. Geological Survey Open-File
Report 74-1021, scale 1:62,500.
Dupré, W.R., 1990a, Maps showing geology and liquefaction
susceptibility of Quaternary deposits in the Monterey, Seaside,
Spreckels, and Carmel Valley quadrangles, Monterey County, California:
U.S. Geological Survey Miscellaneous Field Studies Map MF-2096, 2 sheets,
scale 1:24,000.
_____1990b, Quaternary geology of the Monterey Bay region, California,
in Garrison, R.E., Greene, H.G., Hicks, K.R., Weber, G.E., and Wright,
T.L., eds., Geology and tectonics of the central California coastal
region, San Francisco to Monterey: American Association of Petroleum
Geologists, Volume and Guidebook GB67, Pacific Section, Bakersfield,
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Dupré, W.R., and Tinsley, J.C., III, 1980, Maps showing geology and
liquefaction potential of northern Monterey and southern Santa Cruz
Counties, California: U.S. Geological Survey Miscellaneous Field Studies
Map MF-1199, 2 sheets, scale 1:62,500.
Fiedler, W.M., 1944, Geology of the Jamesburg quadrangle, Monterey
County, California: California Division of Mines, Report XL of the State
Mineralogist, v. 40, no. 2, p. 177-250, 2 map sheets, scale 1:62,500.
Govean, F.M., and Garrison, R.E., 1981, Significance of laminated and
massive diatomites in the upper part of the Monterey Formation,
California, in Garrison, R.E., and Douglas, R.G., eds., The Monterey
Formation and related siliceous rocks of California: Los Angeles, Calif.,
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181-198.
Herold, C.L., 1935, Preliminary report on the geology of the Salinas
quadrangle, California: Berkeley, University of California M.S. thesis,
143 p., 2 sheets, scale 1:62,500.
Jacobson, C.E., Barth, A.P., and Grove, Marty, 2000, Late Cretaceous
protolith age and provenance of the Pelona and Orocopia Schists, southern
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v. 28, no. 3, p. 219-222.
Lawson, A.C., chairman, 1908, The California earthquake of April 18,
1906: Report of the California State Earthquake Investigation Commission:
Washington D.C., Carnegie Institution of Washington, Publication 87, v. 1,
2 parts, 451 p.
McCulloch, D.S., and Greene, H.G., 1989, Geologic map of the central
California continental margin, in Greene, H.G., and Kennedy, M.P., eds.,
Geology of the central California continental margin: California Division
of Mines and Geology California Continental Margin Geologic Map Series,
Map 5A, scale 1:250,000.
Petersen, M.D., Bryant, W.A., Cramer, C.H., Cao, T., Reichle, M.S.,
Frankel, A.D., Lienkaemper, J.J., McCrory, P.A., and Schwartz, D.P.,
1996, Probabilistic seismic hazard assessment for the State of California:
California Division of Mines and Geology Open-File Report 96-08 and U.S.
Geological Survey Open-File Report 96-706, 33 p., 2 appendices.
Rosenberg, L.I., and Clark, J.C., 1994, Quaternary faulting of the
greater Monterey area, California: U.S. Geological Survey Final Technical
Report 1434-94-G-2443, 45 p., 3 appendices, 4 sheets, scale 1:24,000.
Ross, D.C., 1976a, Reconnaissance geologic map of pre-Cenozoic basement
rocks, northern Santa Lucia Range, Monterey County, California: U.S.
Geological Survey Miscellaneous Field Studies Map MF-750, 7 p., 2 sheets,
scale 1:125,000.
_____1976b, Metagraywacke in the Salinian block, central Coast Ranges,
California-and a possible correlative across the San Andreas fault: U.S.
Geological Survey Journal of Research, v. 4, no. 6, p. 683-696.
_____1977, Maps showing sample localities and ternary plots and graphs
showing modal and chemical data for granitic rocks of the Santa Lucia
Range, Salinian block, California Coast Ranges: U.S. Geological Survey
Miscellaneous Field Studies Map MF-799, 16 p., 3 plates.
Staal, Gardner & Dunne, 1988, Phase II hydrogeologic investigation,
Laguna Seca subarea, Monterey County, California: Monterey County Health
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1:12,000.
_____1991a, Hydrogeologic update, El Toro area, Monterey County,
California: Monterey County Water Resources Agency open-file report, 53
p., 4 appendices.
_____1991b, Laguna Seca Ranch, supplemental hydrogeologic assessment:
unpublished letter report to Kimball Small Properties, 7 p.
Terratech, 1989, Supplemental fault investigation, Las Palmas Ranch
Development, Monterey County, California: Monterey County Planning and
Building Inspection open-file report, 3 p.
Thorup, R.R., 1980, Groundwater evaluation of the Flause property,
Corral de Tierra Valley, Monterey County, California: unpublished report
to Robert Flause, 19 p.
Tinsley, J.C., III, 1975, Quaternary geology of the northern Salinas
Valley, Monterey County, California: Stanford, Calif., Stanford University
Ph.D. dissertation, 195 p., 2 sheets, scale 1:62,500.
Tuzon, Brandy, 1997, Mud ravages San Benancio homes: Salinas, Calif.,
The Californian, January 29, 1997, p. 1A.
Younse, G.A., 1980, The stratigraphy and phosphoritic rocks of the
Robinson Canyon-Laureles Grade area, Monterey County, California: U.S.
Geological Survey Open-File Report 80-318, 127 p., 5 sheets.
