Preliminary geologic map emphasizing bedrock formations in Contra Costa County, California: A digital database

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Frequently anticipated questions:


What does this data set describe?

Title:
Preliminary geologic map emphasizing bedrock formations in Contra Costa County, California: A digital database
Abstract:
This digital map database, which is compiled from previously published and unpublished sources combined with new mapping, represents the general distribution and identity of bedrock in Contra Costa County, California.
  1. How might this data set be cited?
    Graymer, R.W., Jones, D.L., and Brabb, E.E., 1994, Preliminary geologic map emphasizing bedrock formations in Contra Costa County, California: A digital database: U.S. Geological Survey Open-File Report 94-622.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -122.436
    East_Bounding_Coordinate: -121.5345
    North_Bounding_Coordinate: 38.101
    South_Bounding_Coordinate: 37.718
  3. What does it look like?
    http://pubs.usgs.gov/of/1994/of94-622/ccmap.pdf (PDF)
    Printable representation of the map, 5.5 megabytes
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 1994
    Currentness_Reference:
    publication date
  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):
      • Entity point
      • Complete Chain
      • GT-polygon composed of chains
    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
      Planar coordinates are specified in meters
  7. How does the data set describe geographic features?
    CC-CORR.AAT
    This ARC coverage contains a correlation table for the units in these maps. (Source: OFR-94-0622)
    LTYPE
    Line type (Source: OFR-94-0622)
    ValueDefinition
    contact, certainContact whose position is certain
    contact, inferred, queriedContact whose position is questionable
    CC-FLT_UTM.AAT
    fault map of Contra Costa County with major faults labeled (Source: OFR-94-0622)
    LTYPE
    Line type (Source: OFR-94-0622)
    ValueDefinition
    fault, approx. locatedFault whose position is not precisely known
    fault, certainObserved fault
    fault, concealedFault whose position is concealed and inferred
    fault, concealed, queriedFault whose position is concealed and questionable
    fault, inferredFault whose position is inferred
    fault, inferred, queriedFault whose position is inferred and questionable
    map boundaryBoundary of mapped area
    thrust fault, approx. locatedThrust fault whose position is not precisely known
    thrust fault, certainObserved thrust fault
    thrust fault, concealedThrust fault whose position is concealed and inferred
    thrust fault, concealed, queriedThrust fault whose position is concealed and questionable
    thrust fault, inferredThrust fault whose position is inferred
    thrust fault, inferred, queried_Thrust fault whose position is inferred and questionable
    water boundary, certainBoundary of a body of water
    CC-FLT_UTM.PAT
    fault map of Contra Costa County with major faults labeled (Source: OFR-94-0622)
    PTYPE
    Point type (Source: OFR-94-0622)
    ValueDefinition
    H2OBody of water
    IAssemblage I - Berkeley Hills
    IIBAssemblage II - Hercules Area
    IIIAssemblage III - Pinole Area
    IVAssemblage IV - Martinez Area
    Assemblage V - Diablo Valley Area 
    (blank)unknown
    CC-AS.PAT
    Index map of Assemblages in Contra Costa County (Source: OFR-94-0622)
    PTYPE
    Polygon type (Source: OFR-94-0622)
    ValueDefinition
    'San Pablo\Bay'Location of San Pablo Bay
    IAssemblage I - Berkeley Hills
    IIAssemblage II - Hercules Area
    IIIAssemblage III - Pinole Area
    IVAssemblage IV - Martinez Area
    VAssemblage V - Diablo Valley Area
    VIAssemblage VI - Eastern Area
    (blank)unknown
    CC_AS.AAT
    Linear features on the index map of assemblages in Contra Costa county (Source: OFR-94-0622)
    LTYPE
    Line type (Source: OFR-94-0622)
    ValueDefinition
    fault, approx. locatedFault whose position is not precisely known
    fault, certainObserved fault
    fault, concealedConcealed fault whose position is inferred
    fault, concealed, queriedFault whose position is concealed and questionable
    fault, inferredFault
    map boundaryBoundary of the mapped area
    thrust fault, certainObserved thrust fault
    thrust fault, inferredThrust fault whose position is inferred
    water boundary, certainBoundary of a body of water
    CC-AS.PAT
    Map units at specific points of the assemblages in Contra Costa County (same attributes as polygon coverage CC_AS.PAT) (Source: OFR-94-0622)
    CC_DR.AAT
    Drainage base map (Source: OFR-94-0622)
    LTYPE
    Line type (Source: OFR-94-0622)
    ValueDefinition
    map boundaryBoundary of mapped area
    (blank)unknown
    CC_CU.AAT
    Cultural base map (Source: OFR-94-0622)
    LTYPE
    Line type (Source: OFR-94-0622)
    ValueDefinition
    map boundaryBoundary of mapped area
    (blank)unknown
    CC_QUAD.AAT
    Index map of 7.5' quadrangle index maps in the Contra Costa county (Source: OFR-94-0622)
    LTYPE
    Line type (Source: OFR-94-0622)
    ValueDefinition
    contact, certainObserved contact
    map boundaryBoundary of mapped area
    water boundary, certainBoundary of a body of water
    CC_QUAD.PAT
    Index map of 7.5' quadrangle index maps in the Contra Costa county (same attributes as arc coverage FLT_UTM.PAT (Source: OFR-94-0622)
    CC_SO.PAT
    Index map of sources of data (Source: OFR-94-0622)
    PTYPE
    Polygon type (Source: OFR-94-0622)
    ValueDefinition
    (blank)unknown
    Range of values
    Minimum:1
    Maximum:14
    Units:unknown
    Resolution:1
    CC_SO.AAT
    Index map of sources of data (same attributes as arc coverage CC_QUAD.AAT) (Source: OFR-94-0622)
    CC_SO.PAT
    Index map of sources of data (same attributes as polygon coverage CC_SO.PAT) (Source: OFR-94-0622)
    CC_SR.AAT
    Fold axes (Source: OFR-94-0622)
    LTYPE
    Line type (Source: OFR-94-0622)
    ValueDefinition
    f.a., anticline, approx. locatedAnticlinal fold axis whose position is not precisely known
    f.a., anticline, certainObserved anticlinal fold axis
    f.a., anticline, concealedConcealed anticlinal fold axis whose position is inferred
    f.a., anticline, inferredAnticlinal fold axis whose position is inferred
    f.a., overturned anticline, approxOverturned antclinal fold axis whose position is not precisely known
    f.a., overturned anticline, certainOverturned anticlinal fold axis whose position is certain
    f.a., overturned anticline, concealOverturned anticlinal fold axis whose position is concealed
    f.a., overturned syncline, approxOverturned synclinal fold axis whose position is not precisely known
    f.a., overturned syncline, certainOverturned synclinal fold axis whose position is certain
    f.a., syncline, approx. locatedSynclinal fold axis whose position is not precisely known
    f.a., syncline, certainSynclinal fold axis whose position is known
    f.a., syncline, concealedSynclinal fold axis whose position is concealed and inferred
    f.a., syncline, inferredSynclinal fold axis whose position is inferred
    map boundaryBoundary of mapped area
    CC_SR.PAT
    Strike and dip information (Source: OFR-94-0622)
    PTTYPE
    Point type (Source: OFR-94-0622)
    ValueDefinition
    beddingBedding orientation
    ot beddingOverturned bedding orientation
    vert beddingBedding whose dip is 90 degrees
    DIP
    Dip of bedding (Source: OFR-94-0622)
    Range of values
    Minimum:3
    Maximum:90
    Units:degrees
    Resolution:1
    STRIKE
    Strike of bedding (Source: OFR-94-0622)
    Range of values
    Minimum:0
    Maximum:358
    Units:degrees
    Resolution:1
    CC_TOPO.AAT
    Topographic base map (Source: OFR-94-0622)
    LTYPE
    Line type (Source: OFR-94-0622)
    ValueDefinition
    map boundaryBoundary of mapped area
    (blank)unknown
    CC_UTM.PAT
    Geologic map units (? indicates uncertainty) (Source: OFR-94-0622)
    PTYPE
    Polygon type (Source: OFR-94-0622)
    ValueDefinition
    QuSurficial deposits, undivided (Pleistocene and Holocene)
    QlsLandslide deposits (Pleistocene and Holocene)
    TbBasaltic intrusive rocks (Pliocene)
    TsvSilicic intrusive rocks (Miocene)
    KJfFranciscan Complex (Jurassic to Upper Cretaceous)
    TbpBald Peak Basalt (Miocene)
    TstSiesta Formation (Miocene)
    TmMoraga Formation (Miocene)
    TorOrinda Formation (Miocene)
    TccClaremont Chert (Miocene)
    TgsUnnamed sandstone and siltstone (Eocene, Oligocene, and Miocene)
    TshGreenish gray shale (Eocene)
    KphPinehurst Shale (Late Cretaceous)
    KrRedwood Canyon Formation (Late Cretaceous)
    KscShephard Creek Formation (Late Cretaceous)
    KoOakland Conglomerate (Late Cretaceous)
    KjmJoaquin Miller Formation (Late Cretaceous)
    JKkKnoxville Formation (Late Jurassic to Early Cretaceous)
    JsvKeratophyre - Coast Range Ophiolite (Jurassic)
    spSerpentinite - Coast Range Ophiolite (Jurassic)
    QmzMontezuma Formation (Pleistocene)
    TmluUpper member - Mullholland Formation of Ham (1952) (Pliocene)
    TmllLower member - Mullholland Formation of Ham (1952) (Pliocene)
    TusUnnamed sedimentary and volcanic rocks (Miocene and Pliocene)
    TptPinole Tuff (Miocene)
    TltLafayette Tuff (Miocene)
    TnNeroly Sandstone (Miocene)
    TcCierbo Sandstone (Miocene)
    TbrBriones Formation (Miocene)
    TbgG member of Wagner (1978) - Briones Formation (Miocene)
    TbfF member of Wagner (1978) - Briones Formation (Miocene)
    TbeE member of Wagner (1978) - Briones Formation (Miocene)
    TbdD member of Wagner (1978) - Briones Formation (Miocene)
    TbuUpper sandstone and shale member - Briones Formation (Miocene)
    TbhHercules Shale Member - Briones Formation (Miocene)
    TblLower sandstone and siltstone member - Briones Formation (Miocene)
    TroRodeo Shale, Hambre Sandstone, Tice Shale, and Oursan Sandstone, undivided (Miocene)
    TrRodeo Shale (Miocene)
    ThHambre Sandstone (Miocene)
    TtTice Shale (Miocene)
    ToOursan Sandstone (Miocene)
    TcsClaremont Shale (Miocene)
    TsSobrante Sandstone (Miocene)
    TtsTuffaceous sandstone (Oligocene or Miocene?)
    TsrSan Ramon Sandstone (Oligocene and/or Miocene)
    TshcShale and claystone (Eocene)
    TcglConglomerate, sandstone, siltstone (Miocene and Pliocene)
    TutTuff (Miocene)
    TdiDiatomite (Miocene)
    TsaSandstone (Miocene)
    TmuMudstone, shale, and siltstone (Miocene)
    TesEscobar Sandstone of Weaver (1953) (Eocene)
    TehsSandstone and shale member - Escobar Sandstone of Weaver (1953) (Eocene)
    TehBasal shale member - Escobar Sandstone of Weaver (1953) (Eocene)
    TmrMuir Sandstone of Weaver (1953) (Eocene)
    TmruUpper member - Muir Sandstone of Weaver (1953) (Eocene)
    TmrlLower member - Muir Sandstone of Weaver (1953) (Eocene)
    TljLas Juntas Shale of Weaver (1953) (Paleocene and Eocene)
    TljuUpper member - Las Juntas Shale of Weaver (1953) (Paleocene and Eocene)
    TljlLower member - Las Juntas Shale of Weaver (1953) (Paleocene and Eocene)
    TvhVine Hill Sandstone of Weaver (1953) (Paleocene)
    TvhuUpper member - Vine Hill Sandstone of Weaver (1953) (Paleocene)
    TvhlLower member - Vine Hill Sandstone of Weaver (1953) (Paleocene)
    KuGreat Valley sequence (Cretaceous)
    KcsGray, massive quartz arenite - Great Valley sequence (Cretaceous)
    KshSiltstone and shale - Great Valley sequence (Cretaceous)
    KusSandstone, siltstone, and shale
    KuhMassive sandstone, minor siltstone
    TgvtGreen Valley and Tassajara Formations of Conduit (1938), undivided (Miocene and Pliocene)
    TduUpper member - Domingene Formation (Eocene)
    TdlLower member - Domingene Formation (Eocene)
    TdlsSandstone - Domingene Formation (Eocene)
    KsltSiltstone with minor shale, claystone, and sandstone. (Late Cretaceous)
    TtuTulare Formation (Pliocene)
    TlLawlor Tuff (Pliocene)
    TktKirker Tuff (Oligocene)
    TmkMarkley Formation (Eocene)
    TmkuUpper member - Markley Formation (Eocene)
    TmklLower member - Markley Formation (Eocene)
    TluUpper siltstone bed - Lower member - Markley Formation (Eocene)
    TllLower siltstone bed - Lower member - Markley Formation (Eocene)
    TsuUpper part - Sidney Flat Shale Member - Markley Formation (Eocene)
    TslLower part - Sidney Flat Shale Member - Markley Formation (Eocene)
    TnvNortonville Shale (Eocene)
    TdDomingene Formation (Eocene)
    TmMeganos Formation (Paleocene)
    TmeUpper member - Meganos Formation (Paleocene)
    TmdSandstone member - Meganos Formation (Paleocene)
    TmcShale member - Meganos Formation (Paleocene)
    TmcssSandstone interbeds - Meganos Formation (Paleocene)
    TmaLower member - Meganos Formation (Paleocene)
    TmzUnnamed sandstone and shale (Paleocene)
    TmzuUpper member - Unnamed sandstone and shale (Paleocene)
    TmzlLower member - Unnamed sandstone and shale (Paleocene)
    KdvDeer Valley Sandstone of Colburn (1964) (Late Cretaceous)
    KeuUpper member - Unit E - Great Valley sequence (Jurassic and Cretaceous)
    KelLower member - Unit E - Great Valley sequence (Jurassic and Cretaceous)
    KelsSandstone interbeds - Unit E - Great Valley sequence (Jurassic and Cretaceous)
    KdUnit D - Sandstone (Late Cretaceous) - Great Valley sequence (Jurassic and Cretaceous)
    KdsShale member - Unit D - Great Valley sequence (Jurassic and Cretaceous)
    KcuUpper member - Unit C - Sandstone and shale (Late Cretaceous) - Great Valley sequence (Jurassic and Cretaceous)
    KcusUpper member sandstone - Upper member - Unit C - Great Valley sequence (Jurassic and Cretaceous)
    KcmMiddle member - Unit C - Great Valley sequence (Jurassic and Cretaceous)
    KclLower member - Unit C - Great Valley sequence (Jurassic and Cretaceous)
    KclsLower member sandstone - Unit C - Great Valley sequence (Jurassic and Cretaceous)
    KbUnit B - Sandstone and shale (Early Cretaceous) - Great Valley sequence (Jurassic and Cretaceous)
    KbshShale member - Unit B - Great Valley sequence (Jurassic and Cretaceous)
    KbsSandstone member - Unit B - Great Valley sequence (Jurassic and Cretaceous)
    KaUnit A - Shale, with minor sandstone (Early Cretaceous) - Great Valley sequence (Jurassic and Cretaceous)
    KasSandstone member - Unit A - Great Valley sequence (Jurassic and Cretaceous)
    JKkKnoxville Formation (Late Jurassic to Early Cretaceous)
    JpbPillow basalt, basalt breccia, and minor diabase - Coast Range Ophiolite (Jurassic)
    JdbDiabase - Coast Range Ophiolite (Jurassic)
    scSilica carbonate rocks - Coast Range Ophiolite (Jurassic)
    H20Body of water
    CC_UTM.AAT
    Faults, depositional contacts (Source: OFR-94-0622)
    LTYPE
    Line type (Source: OFR-94-0622)
    ValueDefinition
    contact, approx. locatedContact whose position is not precisely known
    contact, certainObserved contact
    contact, concealedConcealed contact whose position is inferred
    contact, inferredContact whose position is inferred
    contact, inferred, queriedContact whose position is inferred and questionable
    fault, approx. locatedFault whose position is not precisely known
    fault, certainObserved fault
    fault, concealedConcealed fault whose position is inferred
    fault, concealed, queriedConcealed fault whose position is questionable
    fault, inferredFault whose position is inferred
    fault, inferred, queriedFault whose position is inferred and questionable
    map boundaryBoundary of mapped area
    scratch boundaryLocation of scratch boundary
    thrust fault, approx. locatedThrust fault whose position is not precisely known
    thrust fault, certainObserved thrust fault
    thrust fault, concealedConcealed thrust fault whose position is inferred
    thrust fault, inferredThrust fault whose position is inferred
    thrust fault, inferred, queried_Thrust fault whose position is inferred and questionable
    water boundary, certainBoundary of a body of water
    (blank)unknown
    CC_UTM.PAT
    Geologic map units at specific locations (? indicates uncertainty) (same attributes as polygon coverage CC_UTM.PAT) (Source: OFR-94-0622)

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • R.W. Graymer
    • D.L. Jones
    • E.E. Brabb
  2. Who also contributed to the data set?
    J. Ross Wagner, Montgomery Watson Consultants, Walnut Creek, kindly shared his extensive and high quality unpublished geologic maps covering the area from Pinole to San Ramon (see ccsource.txt). Thomas D. Barrow, President of Exxon, graciously released unpublished geologic mapping and paleontologic information collected by Howard S. Sonneman and John R. Switzer, Jr. covering most of the central and all of the eastern part of the county. We are grateful to James R. LeCompte who compiled these maps and other data in the 1970's. This drafted copy was scanned and initially edited and tagged by Maureen A. Kelly in consultation with Carl M. Wentworth. We are also grateful to Kristin R. McDougall, William V. Sliter, David Bukry, John A. Barron, and William P. Elder for paleontologic determinations, Marvin A Lanphere and Robert J. Fleck for the determination of the age of volcanic rocks, and Andrei M. Sarna-Wojcicki for correlation of volcanic tuffs that helped establish the stratigraphic sequence and structural complexity of the geologic units. Alvin A. Almgren, Unocal (retired) reviewed early versions of this map and provided much new information. Philip J. Stuecheli, Geotechnical Engineering Consultants, provided access and subdivision maps for an area under construction in Clayton. Tim D. Bray, consultant and Prof. Raymond Sullivan, San Francisco State Univ., arranged for access to cores and other geologic information in the Keller Canyon landfill area south of Pittsburg. David J. Gross, Woodward-Clyde Consultants, provided geologic maps and arranged for access to cores in the Los Vaqueros Dam area near Byron. Laurel Collins helped provide access to lands owned by the East Bay Regional Park District. Larry J. Dickerson and John M. Parker provided extensive support in the field. Carl Wentworth and Geoff Phelps provided assistance with Alacarte and ARC/INFO.
  3. To whom should users address questions about the data?
    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

Why was the data set created?

The purpose of this report is to provide to the public a digital geologic map database, and together with the accompanying text file (ccgeo.txt), it provides current information on the stratigraphy and structural geology of the area covered.

How was the data set created?

  1. From what previous works were the data drawn?
    Wagner (1978) (source 1 of 4)
    Wagner, 1978, Late Cenozoic history of the Coast Ranges east of San Francisco Bay: Berkeley, University of California Ph.D. Thesis.

    Other_Citation_Details: 160 pages, 12 plates
    Type_of_Source_Media: paper
    Source_Contribution: Geologic mapping of area
    Sheehan (1956) (source 2 of 4)
    Sheehan, J.R., 1956, Structure and stratigraphy of N.W. Contra Costa County, California: Berkeley, University of California M.A. thesis.

    Type_of_Source_Media: paper
    Source_Contribution: Geologic mapping of the area
    Blake and others (1974) (source 3 of 4)
    Blake, M.C., Jr., Bartow, J.A., Frizzell, V.A., Jr., Sorg, C., Schlocker, J., Westworth, C.M., and Wright, R.H., 1974, Preliminary geologic map of Marin, San Francisco, and parts of adjacent Counties, California: U.S. Geological Survey Miscellaneous Field Studies Map MF-574.

    Type_of_Source_Media: paper
    Source_Contribution: Geologic mapping of the area
    Radbruch (1969) (source 4 of 4)
    Radbruch, D.H., 1969, Areal and engineering geology of the Oakland East Quadrangle, California: U.S. Geological Survey Miscellaneous Investigations Series Map GQ-769.

    Type_of_Source_Media: paper
    Source_Scale_Denominator: 24000
    Source_Contribution: Mapped Quaternary and Holocene faults in Contra Costa County
  2. How were the data generated, processed, and modified?
    Date: unknown (process 1 of 2)
    The geologic map information was digitized from stable originals of the geologic maps mostly at 1:62,500 scale (geology in the San Quentin quadrangle was scanned at 1:24,000 scale). The author manuscripts (ink on mylar) were scanned using a Tektronix 4991 monochrome scanner with a resolution of 304.8 dots per inch. The scanned images were 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 a contact or fault as appropriate, and scanning artifacts visible at 1:50,000 were removed.
    Base Map layers were prepared from scale-stable printing negatives of the U.S. Geological Survey Napa (1983 edition), Lodi (1993 edition), Stockton (1989 edition), and San Francisco (1978 edition) 1:100,000 topographic maps. Scanned and vectorized images were transformed from scanner coordinates to projection coordinates with digital tics placed by hand at map corners. The images were then trimmed interactively by hand using ALACARTE to conform to the area of the geologic coverages, and the various portions were combined. Small mismatches at the boundaries caused by slight differences in the original scans remain in the three base map coverages. These base map layers are digital images but no information other than location is attached to the lines.
    Date: 01-Sep-2000 (process 2 of 2)
    Creation of original metadata record Person who carried out this activity:
    Jennifer Lenz
    U.S. Geological Survey
    12201 Surise Valley Drive, Mail Stop 918
    Reston, VA
    USA

    703-648-6974 (voice)
    703-648-6560 (FAX)
    pschweitzer@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?
  2. How accurate are the geographic locations?
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    The faults represented in this database are not intended to show hazards at any specific site, or to take the place of fault-rupture hazard zones designated by the California State Geologist (Hart, 1988).
  5. How consistent are the relationships among the observations, including topology?
    This map represents an integration of the published and unpublished geologic maps of several previous workers (see Sources of Data in ccsource.txt) and more than 1000 man hours of new geologic mapping and field checking by us. The data are released in a preliminary digital form to provide an opportunity for staff from governmental agencies, consultants, teachers, and other users to have this geologic map long before the final map is published.

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: None
  1. Who distributes the data set? (Distributor 1 of 1)
    USGS Information Services
    Box 25286, Denver Federal Center
    Denver, Colorado
    USA

    1-888-ASK-USGS (voice)
    1-303-202-4695 (FAX)
    infoservices@usgs.gov
  2. What's the catalog number I need to order this data set? USGS Open-File Report 94-622
  3. What legal disclaimers am I supposed to read?
    This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards or with the North American Stratigraphic Code. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
    This database, identified as "Preliminary geologic map emphasizing bedrock formations in Contra Costa County, California: A digital database," has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use.
  4. How can I download or order the data?
    • Availability in digital form:
      Data format:
      ARC/INFO Coverages  Description of coverage
      
      cc_utm              Faults, depositional contacts, and rock unit identities
      cc_sr               Fold axes, strike and dip information
      cc-flt_utm
      cc-flt_ano          Together, these ARC coverages contain a fault map of Contra Costa County with major faults labeled
      cc_dr               Drainage base map
      cc_cu               Cultural base map
      cc_topo             Topographic contours base map
      cc_so               Index map of sources of data
      cc_as               Index map of Assemblages in Contra Costa County
      cc_quad
      cc-quad_ano         Together, these ARC coverages contain an index map of 7.5 minute quadrangles in Contra Costa County
      cc-corr_utm         Correlation table for the units in these maps
      
      in format ARCE (version 6.x) Size: 21.2
      Network links: http://pubs.usgs.gov/of/1994/of94-622/cc_g1.tar.Z
    • Cost to order the data: none


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)

This page is <https://geo-nsdi.er.usgs.gov/metadata/open-file/94-622/metadata.faq.html>
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