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USGS Geoscience Data Catalog

Geologic map and map database of the Spreckels 7.5-minute quadrangle, Monterey County, California

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What does this data set describe?

Title:
Geologic map and map database of the Spreckels 7.5-minute quadrangle, Monterey County, California
Abstract:
This digital map database, compiled from previously published and unpublished data, and new mapping by the authors, represents the general distribution of bedrock and surficial deposits in the mapped area.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.
Supplemental_Information:
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, Calif., p. 185-191.
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., Society of Economic Paleontologists and Mineralogists, Pacific Section, p. 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 California: Implications for evolution of the Cordilleran margin: Geology, 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 Department open-file report, 33 p., 6 appendices, 8 sheets, scale 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.
  1. How might this data set be cited?
    Clark, J.C., Brabb, E.E., Rosenberg, L.I., Goss, H.V., and Watkins, S.E., 2000, Geologic map and map database of the Spreckels 7.5-minute quadrangle, Monterey County, California: U.S. Geological Survey Miscellaneous Field Studies Map 2349, U.S. Geological Survey, Menlo Park, CA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -121.7500000
    East_Bounding_Coordinate: -121.6216666
    North_Bounding_Coordinate: 36.62166666
    South_Bounding_Coordinate: 36.75000000
  3. What does it look like?
    http://pubs.usgs.gov/mf/2001/2349/skmap.pdf (PDF)
    A PDF representation of the geologic map and base maps at a scale of 1:24,000 (Sheet 1). 7.6 megabytes.
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 2000Currentness_Reference:
    The date given is the publication date. The information in the report is the most up-to-date available at the time of publication.
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: map
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Vector data set. It contains the following vector data types (SDTS terminology):
      • Point (375)
      • String (1105)
      • GT-polygon composed of chains (376)
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 10
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -123
      Latitude_of_Projection_Origin: 0.0
      False_Easting: 500000
      False_Northing: 0.0
      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 1.0
      Ordinates (y-coordinates) are specified to the nearest 1.0
      Planar coordinates are specified in METERS
      The horizontal datum used is Unknown.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.4.
      The flattening of the ellipsoid used is 1/294.98.
  7. How does the data set describe geographic features?
    SK-GEOL.PAT
    polygon attribute table (Source: ARC/INFO)
    PTYPE
    Labels of geologic units and areas of water.
    ValueDefinition
    QafArtificial fill
    QbBasin deposits
    QalAlluvial deposits, undivided
    QyfYounger flood-plain deposits
    QofOlder flood-plain deposits
    QcColluvium
    QcfAbandoned channel fill deposits
    QlsLandslide deposits
    QtTerrace deposits, undivided
    QoeOlder eolian deposits
    QchAlluvial fan deposits of Chualar
    QpAlluvial fan deposits of Placentia
    QglAlluvial fan deposits of Gloria
    QTcContinental deposits, undivided
    TsmSanta Margarita Sandstone
    TmdMonterey Formation, diatomite
    TmMonterey Formation, porcelinite
    TusUnnamed sandstone
    TussUnnamed sandstone, undifferentiated
    TucUnnamed conglomerate
    KgdGranodiorite of Cachagua of Ross
    KqmGarnetiferous quartz monzonite of Pine Canyon of Ross
    KhqdHornblende-biotite quartz diorite and diorite of Corral de Tierra
    mscSchist of the Sierra de Salinas of Ross
    msQuartzofeldspathic rocks
    mlMarble
    waterwater
    SK-GEOL.AAT
    arc attribute table (Source: ARC/INFO)
    LTYPE
    The type of lines used in the geology layer. Includes all faults, as well as lines bounding polygons that define geologic units. (Source: author)
    ValueDefinition
    contact, certainBoundary between two mapped units that retains the original depositional or intrusive relationship (i.e. not faulted). The contact has been observed or is closely constrained, so it is well-located as described in Positional_Accuracy.
    contact, approx. locatedBoundary between two mapped units that retains the original depositional or intrusive relationship (i.e. not faulted). The contact has not been observed, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 1.25 mm at map scale (1:24,000) or within about 30 meters on the ground.
    contact, inferred, queriedBoundary between two mapped units that retains the original depositional or intrusive relationship (i.e. not faulted). The contact has not been observed, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 1.25 mm at map scale (1:24,000) or within about 30 meters on the ground. The existence of the contact is inferred from structural and stratigraphic relationships observed elsewhere.
    contact, sed_terrace, approx. locatedInner edge of a terrace deposit at the break in slope on the landward side of either a coastal terrace (shoreline angle) or a stream terrace. The contact has not been observed, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 1.25 mm at map scale (1:24,000) or within about 30 meters on the ground.
    contact, sed_terrace, certainInner edge of a terrace deposit at the break in slope on the landward side of either a coastal terrace (shoreline angle) or a stream terrace. The contact has been observed or is closely constrained, so it is well-located as described in Positional_Accuracy.
    fault, approx. locatedStructural boundary between mapped units or structural discontinuity within a mapped unit that has experienced relative offset between the rock bodies on either side of the fault. The fault has not been observed, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 1.25 mm at map scale (1:24,000) or within about 30 meters on the ground.
    fault, certainStructural boundary between mapped units or structural discontinuity within a mapped unit that has experienced relative offset between the rock bodies on either side of the fault. The fault has been observed or is closely constrained, so it is well-located as described in positional_Accuracy.
    fault, concealedStructural boundary between mapped units or structural discontinuity within a mapped unit that has experienced relative offset between the rock bodies on either side of the fault. The fault is obscured by overlying mapped units, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 2.5 mm at map scale (1:24,000) or within about 60 meters on the ground.
    fault, concealed, queriedStructural boundary between mapped units or structural discontinuity within a mapped unit that has experienced relative offset between the rock bodies on either side of the fault. The fault is obscured by overlying mapped units, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 2.5 mm at map scale (1:24,000) or within about 60 meters on the ground.
    map boundary,Edge of the mapped area. Used primarily to bound polygons at the edge of the map database. The location of the boundary is well located as described in Positional_Accuracy.
    SK-STRC.PAT
    Attribute table of SK-STRC.
    PTTYPE
    The type of planar feature which was observed and the orientation of which was measured at this point. (Source: author)
    ValueDefinition
    ash beddingAsh bed too thin to appear on map.
    beddingOriginally horizontal sedimentary layers were observed at this point.
    flat beddingSedimentary layers that retain their original horizontal position were observed at this point.
    foliationMetamorphic foliation was observed at this point.
    ot beddingOriginally horizontal sedimentary layers were observed at this point. Evidence that the beds are overturned was observed, although that observation may not have been made at this point.
    vert beddingOriginally horizontal sedimentary layers were observed at this point. These layers are now vertical.
    vert foliationVertical metamorphic foliation was observed at this point.
    DIP
    The inclination of planar structures measured in degrees down from horizontal. (Source: author)
    Range of values
    Minimum:0
    Maximum:90
    Units:degrees
    Resolution:1
    STRIKE
    The orientation of a horizontal line in an inclined planar structure measured in degrees clockwise from north. (Source: author)
    Range of values
    Minimum:0
    Maximum:359
    Units:degrees
    Resolution:1
    SK-STRC.AAT
    Attribute table of SK-STRC.
    LTYPE
    The type of fold axis or other structural linear feature that does not bound geologic units. Faults are described in a separate coverage, but some contacts are described in this coverage. (Source: author)
    ValueDefinition
    contact, certainBoundary between two mapped units that retains the original depositional or intrusive relationship (i.e. not faulted). The contact has been observed, so it is well-located as described in Positional_Accuracy.
    f.a., anticline, certainThe surface trace of the axis of an anticline. The axis is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 2.5 mm at map scale (1:24,000) or within about 60 meters on the ground.
    f.a., anticline, concealedThe surface trace of the axis of an anticline. The axis is obscured by overlying mapped units, so it is not well- located as described in Positional_Accuracy, but the location is constrained to be within about 2.5 mm at map scale (1:24,000) or within about 60 meters on the ground.
    f.a., anticline, approx. locatedThe surface trace of the axis of an anticline. The axis has not been observed, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 3.75 mm at map scale (1:24, 000) or within about 90 meters on the ground.
    f.a., syncline, certainThe surface trace of the axis of a syncline. The axis is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 2.5 mm at map scale (1:24,000) or within about 60 meters on the ground.
    f.a., syncline, concealedThe surface trace of the axis of a syncline. The axis is obscured by overlying mapped units, so it is not well- located as described in Positional_Accuracy, but the location is constrained to be within about 2.5 mm at map scale (1:24,000) or within about 60 meters on the ground.
    f.a., syncline, approx. locatedThe surface trace of the axis of a syncline. The axis has not been observed, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 3.75 mm at map scale (1:24,000) or within about 90 meters on the ground.
    PLUNGE
    Database item added in order to plot plunge arrows on plunging fold axes.
    ValueDefinition
    arrowheadThe plunging end of a fold axis.
    0Not a plunging fold axis.
    SK-LNDS.PAT
    Attribute table of SK-LNDS.
    PTTYPE
    Feature observed at this point (Source: author)
    ValueDefinition
    oil wellDry hole drilled for hydrocarbon exploration
    springSpring
    water wellWater well
    Entity_and_Attribute_Overview:
    The databases in this report were compiled in ARC/INFO, a commercial Geographic Information System (Environmental Systems Research Institute, Redlands, California). Almost all the attributes in the various attribute tables of the coverages included in the report are set or calculated by Arc/Info. The exceptions are "coveragename"-ID, LTYPE, PTYPE, PTTYPE, STRIKE, and DIP.
    "coveragename"-ID is required by internal policy to be sequential. This ensures the highest compatibility of our databases with other GISs. Therefore "coveragename"-ID is calculated equal to "coveragename"#, which is a unique, sequential integer assigned by Arc/Info to each data record.
    LTYPE, PTYPE, and PTTYPE are author added items to the coverage AAT or PAT that are used to describe the type of line (LTYPE), area (PTYPE), or point (PTTYPE) being recorded. All coverages with AAT and PAT present include these items in the data structure, although in some cases these items are not used. Each has WIDTH 35, OUTPUT 35, TYPE C. STRIKE and DIP are author added items to the coverage PAT that record information about the orientation of planar geologic structures. Both have WIDTH 3, OUTPUT 3, TYPE I. These items are only recorded in the table SK-STRC.PAT
    Entity_and_Attribute_Detail_Citation: This report, skmf.txt, skmf.pdf, or skmf.ps
  8. What are the components of this data set?
    GIS data (file)
    ArcInfo GIS-ready data layers in .e00 format

    sk-geol.e00 (Arc/Info export file)
    Polygon and line coverage showing faults, depositional contacts, and rock units in the map area.
    sk-strc.e00 (Arc/Info export file)
    Point and line coverage showing strike and dip information and fold axes.
    sk-lnds.e00 (Arc/Info export file)
    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.

    Ancilliary data (file)
    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 (file, PostScript)
    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 (file, PDF)
    A PDF version of mamf.ps.
    skmf.txt (file, ASCII)
    A text-only file containing an unformatted version of skmf.ps.
    import.aml (file, text (AML))
    ASCII text file in ARC Macro Language to convert ARC export files to ARC coverages in ARC/INFO.
    skmap.ps (file, PostScript)
    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 (file, 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.


Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
  2. Who also contributed to the data set?
    David L. Wagner of the California Division of Mines and Geology ( CDMG) provided Clark and Rosenberg with funding for their 1998 field mapping. Wagner also coordinated the work of Sarah E. Watkins (CDMG), who digitized the geologic map for incorporation into the geologic map of the Monterey 1:100,000-scale quadrangle, which is in preparation.
    Andrei Sarna-Wojcicki (USGS) analyzed and correlated Miocene ash beds from the quadrangle. Charles Powell, II (USGS) identified and interpreted mollusks collected from the quadrangle by Brabb and Clark. He also examined and interpreted mollusks at the California Academy of Science collected by Bowen and at the Museum of Paleontology, University of California, Berkeley that had been collected and reported by Herold (1935). Kristin McDougall (USGS) identified and interpreted Miocene foraminifers. Victoria Langenheim (USGS) and Robert Jachens (USGS) kindly provided unpublished gravity and aeromagnetic data with an interpretation of regional faulting. Special thanks go to Richard R. Thorup for sharing his extensive knowledge of the geology of the quadrangle.
    Heather V. Goss (USGS and Environmental Careers Organization) added a structure layer, including strikes and dips and fold axes, to the digital map file, annotated and formatted the map to conform to USGS publication standards, and made corrections to the map after technical reviews. She wrote the metadata for the digital file, formatted the text to conform to USGS publication standards, and changed and added information after technical review.
  3. To whom should users address questions about the data?
    USGS Western Geologic Mapping Team
    Attn: Database coordinator
    345 Middlefield Road, MS 975
    Menlo Park, CA
    USA


Why was the data set created?

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.

How was the data set created?

  1. From what previous works were the data drawn?
    Ross, 1976 (source 1 of 6)
    Ross, D.C., 1976, 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.

    Type_of_Source_Media: paper
    Source_Scale_Denominator: 125000
    Source_Contribution: Source map for basement rock distribution
    Dupre, 1990 (source 2 of 6)
    Dupre, W.R., 1990, 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.

    Type_of_Source_Media: paper
    Source_Scale_Denominator: 24000
    Source_Contribution: Source map for Quaternery deposits
    Rosenberg (unpublished) (source 3 of 6)
    Rosenberg, L.I., (unpublished), unpublished geologic investigations.

    Type_of_Source_Media: paper
    Source_Contribution: Source for information on Quaternary deposits
    Brabb (unpublished) (source 4 of 6)
    Brabb, E.E., (unpublished), unpublished geologic investigations.

    Type_of_Source_Media: paper
    Source_Contribution: Source for information on landslide locations
    Bowen, 1969 (source 5 of 6)
    Bowen, O.E., Jr., 1969, Geologic map of the Spreckels 7.5-minute quadrangle, unpublished: California Division of Mines and Geology.

    Type_of_Source_Media: paper
    Source_Scale_Denominator: 24000
    Source_Contribution: Source map for geology
    Dibblee, 1973 (source 6 of 6)
    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.

    Type_of_Source_Media: paper
    Source_Scale_Denominator: 62500
    Source_Contribution: Source map for geology
  2. How were the data generated, processed, and modified?
    Date: 1999 (process 1 of 2)
    The databases in this report were compiled in ARC/INFO, a commercial Geographic Information System (Environmental Systems Research Institute, Redlands, California), with version 3.0 of the menu interface ALACARTE (Fitzgibbon and Wentworth, 1991, Fitzgibbon, 1991, Wentworth and Fitzgibbon, 1991). The files are in either GRID (ARC/INFO raster data) format or COVERAGE (ARC/INFO vector data) format. Coverages are stored in uncompressed ARC export format (ARC/INFO version 7.x). ARC/INFO export files (files with the .e00 extension) can be converted into ARC/INFO coverages in ARC/INFO (see below) and can be read by some other Geographic Information Systems, such as MapInfo via ArcLink and ESRI's ArcView (version 1.0 for Windows 3.1 to 3.11 is available for free from ESRI's web site: http://www.esri.com). The digital compilation was done in version 7.1.1 of ARC/INFO with version 3.0 of the menu interface ALACARTE (Fitzgibbon and Wentworth, 1991, Fitzgibbon, 1991, Wentworth and Fitzgibbon, 1991).
    The geologic map information was digitized from a stable original of the geologic map at 1:24,000 scale. The author manuscript (pen on mylar) was scanned using a Altek monochrome scanner with a resolution of 800 dots per inch. The scanned image was vectorized and transformed from scanner coordinates to projection coordinates with digital tics placed by hand at quadrangle corners. The scanned lines were edited interactively by hand using ALACARTE, color boundaries were tagged as appropriate, and scanning artifacts visible at 1:24,000 were removed.
    Date: 30-Jan-2001 (process 2 of 2)
    Creation of original metadata record Person who carried out this activity:
    Graymer, Russell W
    USGS-GEO-WRG-NGM
    Mail Stop 975, USGS
    345 Middlefield Road
    Menlo Park, CA
    US

    650-329-4988 (voice)
    rgraymer@usgs.gov
  3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
    This report has undergone two scientific peer reviews, one digital database review, one review for conformity with geologic names policy, and review of the plotfiles for conformity with USGS map standards.
  2. How accurate are the geographic locations?
    Well located data items are intended to have a horizontal positional accuracy within .62 mm at 1:24,000 scale, or within 15 meters on the ground. The general positional accuracy of each line in the database is indicated within the LTYPE field in the Arc Attribute Table (see below). Points in the database are generally considered to be well located. The position of each data item is derived from the USGS topographic base map, and therefore additional inaccuracies arising from inaccuracies in the base map may also be encountered. See Aitken (1997) for information regarding the horizontal positional accuracy of the basemaps.
  3. How accurate are the heights or depths?
    No vertical positional data recorded. See Aitken (1997) for information regarding the vertical positional accuracy of the basemaps used to create the plotfiles of the geologic maps.
  4. Where are the gaps in the data? What is missing?
    The report is intended to describe completely the bedrock geology at 1:24,000 scale. Geologic information only mappable at larger scale has been omitted. In addition, landslide deposits are for the most part not recorded. Further, Quaternary surficial deposits in many areas have been intentionally undifferentiated.
  5. How consistent are the relationships among the observations, including topology?
    Polygon and chain-node topology present

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: None
Use_Constraints:
Uses of this digital geologic map should not violate the spatial resolution of the data. Although the digital form of the data removes the constraint imposed by the scale of a paper map, the detail and accuracy inherent in map scale are also present in the digital data. The fact that this database was edited for a scale of 1:24,000 means that higher resolution information is not present in the dataset. Plotting at scales larger than 1:24,000 will not yield greater real detail, although it may reveal fine-scale irregularities below the intended resolution of the database. Similarly, where this database is used in combination with other data of higher resolution, the resolution of the combined output will be limited by the lower resolution of these data.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey Information Services
    Box 25248, Denver Federal Center
    Denver, CO
    USA

    1-888-ASK-USGS (voice)
    1-303-202-4693 (FAX)
  2. What's the catalog number I need to order this data set? USGS MF-2349
  3. What legal disclaimers am I supposed to read?
    Commercial entities named in the texts of this report are cited for descriptive purposes, not to constitute an endorsement of those products.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 05-Feb-2016
Metadata author:
Peter N Schweitzer
USGS Midwest Area
Collection manager, USGS Geoscience Data Clearinghouse, http://geo-nsdi.er.usgs.gov/
Mail Stop 954
12201 Sunrise Valley Dr
Reston, VA
USA

703-648-6533 (voice)
703-648-6252 (FAX)
pschweitzer@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:

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