Geologic Map of the Monterey and Seaside 7.5-minute Quadrangles, Monterey County, California: A Digital Database

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Frequently anticipated questions:


What does this data set describe?

Title:
Geologic Map of the Monterey and Seaside 7.5-minute Quadrangles, Monterey County, California: A Digital Database
Abstract:
This Open-File report is a digital geologic map database stored in a computer in the U. S. Geological Survey offices in Menlo Park, California. The study area includes the Monterey Peninsula and part of the Carmel Valley area. Geologically, this region is situated within the complexly deformed Salinian block between the active San Andreas fault to the northeast and the San Gregorio fault zone to the southwest. It also is characterized by compressional tectonics related to the San Andreas fault system and includes many poorly understood subsidiary faults (Greene and others, 1988). A series of high-angle faults trends northwestward across the quadrangles. Most of the faults in the area are discontinuous, with some less than 1 km long; however, the Tularcitos fault zone continues across the entire mapped area. These faults displace the Monterey Formation and locally offset Quaternary deposits.
  1. How might this data set be cited?
    Clark, Joseph C., Dupre, William R., and Rosenberg, Lewis 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.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -122.00
    East_Bounding_Coordinate: -121.75
    North_Bounding_Coordinate: 38.75
    South_Bounding_Coordinate: 36.50
  3. What does it look like?
    http://pubs.usgs.gov/of/1997/of97-030/mo-se.pdf (PDF)
    PDF representation of geologic map sheet
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 1997
    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.
    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
      Planar coordinates are encoded using coordinate pair
      Planar coordinates are specified in meters
      The horizontal datum used is NAD27.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.
      The flattening of the ellipsoid used is 1/294.98.
  7. How does the data set describe geographic features?
    MO_ANNO.PAT and SE_STRUCT.PAT
    Fault names, U/D, locality numbers, and dip numbers (Source: OFR-97-30)
    PTTYPE
    Point type (Source: OFR-97-30)
    ValueDefinition
    air photo attitudeAttitude of bedding determined from air photo
    anti arrowAnticline arrow
    approx beddingBedding whose orientation is not exact
    beddingBedding orientation
    fault ss rlRight-lateral strike-slip fault orientation
    flat beddingBedding whose dip is near horizontal
    syn arrowSyncline arrow
    traingletriangle orientation
    vert beddingBedding whose dip is vertical
    circleCircle orientation
    Dip direction from distant viewDip of bedding taken from a distance (not precise)
    ot beddingOverturned bedding
    SpringSpring location
    DIP
    Dip of structural features (Source: OFR-97-30)
    Range of values
    Minimum:0
    Maximum:90
    Units:degrees
    Resolution:1
    STRIKE
    Strike of structural features (Source: OFR-97-30)
    Range of values
    Minimum:0
    Maximum:359
    Units:degrees
    Resolution:1
    MO_ARWS.AAT and SE_ARWS.AAT
    Landslide arrows (Source: OFR-97-30)
    LTYPE
    Line type (Source: OFR-97-30)
    ValueDefinition
    arrow, certainLocation of arrow on geological map
    contact, certainLocation of contact on geological map
    (blank)unknown
    MO_FOLD.AAT
    Fold axes (Source: OFR-97-30)
    LTYPE
    Line type (Source: OFR-97-30)
    ValueDefinition
    f.a., anticline, certainAnticlinal fold axis whose position was observed
    f.a., anticline, concealedConcealed anticlinal fold-axis whose position is inferred
    f.a., anticline, inferredAnticlinal fold axis whose position is inferred
    f.a., syncline, concealedConcealed syncline fold axis whose position is inferred
    f.a., syncline, inferredSynclinal fold axis whose position is inferred
    MO_GEOL.PAT and SE_GEOL.PAT
    Geologic map (Source: OFR-97-30)
    PTYPE
    Polygon type (Geologic map unit symbols were not described in database but full descriptions are) (Source: OFR-97-30)
    MO_GEOL.AAT and SE_GEOL.AAT
    Linear features on geologic map (Source: OFR-97-30)
    LTYPE
    Line type (Source: OFR-97-30)
    ValueDefinition
    contact, approx. locatedContact whose position is not precise
    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
    contact, sag pond, approx. locationContact of sag pond whose position is not precisely known
    contact, sag pond, certainObserved sag pond contact
    contact, sag pond, inferred, queriedSag pond contact whose position is inferred and questionable
    fault, certainObserved fault
    fault, concealedConcealed fault whose position is inferred
    fault, concealed, queriedConcealed fault whose position is inferred and questionable
    fault, inferredFault whose position is inferred
    fault, inferred, queriedFault whose position is inferred and questionable
    map boundary,Location of map boundary
    scratch boundaryLocation of scratch boundary
    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, queriedThrust fault whose position is inferred and questionable
    MO_GEOL.PAT and SE_GEOL.PAT
    Geologic map at specific locations (same attributes as polygon coverage MO_GEOL.PAT) (Source: OFR-97-30)
    MO_STRC.PAT
    Structural features (same attributes as point coverage MO_ANNO.PAT) (Source: OFR-97-30)

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Joseph C. Clark
    • William R. Dupre
    • Lewis I. Rosenberg
  2. Who also contributed to the data set?
    The present study was initiated as part of a regional study of the earthquake hazards of the San Francisco Bay region and is part of the National Earthquake Hazards Reduction Program (NEHRP) of the U.S. Geological Survey. Earl E. Brabb (USGS) established this project, provided base maps, aerial photographs, and other materials, and helped to obtain funding for much of the field work. Partial funding was provided by USGS NEHRP award number 1434-94-G-2443 to Rosenberg and Clark. Supplemental funding was provided by the Monterey County Planning Department under the supervision of Catherine S. West. We are also grateful to the USGS Volunteer Scientist Program for sponsoring Clark and Rosenberg.
    Many people gave freely of their time and resources. John C. Tinsley (USGS) and Earl E. Brabb helped by visiting the study area and sharing their opinions. H. Gary Greene (Moss Landing Marine Laboratories), Joseph W. Oliver (Monterey Peninsula Water Management District), Oliver E. Bowen (consulting geologist), and John Logan (consulting geologist) provided unpublished data from their files. Kristin McDougall (USGS) identified and interpreted Miocene foraminifers. Michael P. Bohan (IUP) digitized the geologic contacts, and Carl M. Wentworth (USGS) and Russell W. Graymer (USGS) assisted with developing the digital map. The Explanation of Units sheet was created by Zenon C. Valin (USGS) with assistance from Karen Wheeler (USGS). Carolyn Randolph prepared this booklet announcing the release of the database in Open Files. Special thanks go to Thomas W. Dibblee, Jr., who participated with Clark in the earlier field mapping and shared his unique perspective of the regional geology, and to Richard R. Thorup for sharing his extensive knowledge of the local geology.
  3. To whom should users address questions about the data?
    Clark, Joseph D
    USGS-BRD
    Dept of Forestry Wildlife & Fish
    Knoxville, TN
    US

    615-974-0739 (voice)
    jclark1@usgs.gov

Why was the data set created?

To provide to the public a digital geologic map database of the Monterey and Seaside 7.5' quadrangles.

How was the data set created?

  1. From what previous works were the data drawn?
    Clark and others (1974) (source 1 of 2)
    Clark, J.C., Dibblee, T.W., Jr., Greene, H.G., and Bowen, O.E., Jr, 1974, Preliminary geologic map of the Monterey and Seaside 7.5-minute quadrangles, Monterey County Calif., with emphasis on active faults: U.S. Geological Survey Miscellaneous Field Studies Map MF-577.

    Other_Citation_Details: 2 plates
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 24000
    Source_Contribution:
    Bedrock and fault mapping, field work from 1973 to 1974, 1984 to 1995
    Rosenberg and Clark (1994) (source 2 of 2)
    Rosenberg, L.I., and Clark, J.C., 1994, Quaternary faulting of the greater Monterey area, California: U.S. Geological Survey Open-File Report 1434-94-G-2443.

    Other_Citation_Details: 45 pages, 3 appendices, 4 map sheets
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 24000
    Source_Contribution:
    Bedrock and fault mapping, field work from 1973 to 1974, 1984 to 1995
  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 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 place 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 1:24,000 were removed.
    Base map layers were prepared from scale-stable printing positives of the U.S. Geological Survey Monterey (1968 edition) and Seaside (1968 edition) 1:24,000 topographic maps, which have a 20-foot contour interval. Scanned images were transformed from scanner coordinates to projection coordinates with digital tics placed by hand at quadrangle corners. The images were trimmed interactively by hand using ALACARTE to conform to the area of the geologic coverages. Small mismatches at the boundaries caused by slight differences in the original maps remain in the two base map coverages. These base map layers are digital images but no information other than location is attached to the pixels.
    Date: 08-Jun-2009 (process 2 of 2)
    Creation of original metadata record Person who carried out this activity:
    Jennifer Lenz
    US 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?
    This map is intended to be of general use to engineers and land-use planners; however, its small scale 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, 1992).
  5. How consistent are the relationships among the observations, including topology?
    This digital map database updates a previously published map (Clark and others, 1974) and other published and unpublished data (see Sources of Data in mo-se.ps2) with substantial new mapping by the authors. Together with the accompanying text file (mo-se_geo.txt or mo-se_geo.ps), it provides current information on the stratigraphy and structural geology of the area.

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? US Geological Survey Open-File Report 97-30
  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 "Geologic map of the Monterey and Seaside 7.5-minute quadrangles, Monterey 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 the 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 export files	Description of coverage
      
      Monterey 7.5' quadrangle:
      mobase_utm.e00         Vectorized topographic base map for the Monterey quadrangle
      mo_geol.e00            Geologic map
      mo_strc.e00            Strike and dip symbols and fold arrow markers
      mo_anno.e00            Fault names, U/D, locality numbers, and dip numbers
      mo_fold.e00            Fold axes
      mo_arws.e00            Landslide arrows
      
      Seaside 7.5' quadrangle:
      sebase_utm.e00         Vectorized topographic base map for the Seaside quadrangle
      se_geol.e00            Geologic map
      se_strc.e00            Strike and dip symbols and fold arrow markers
      se_anno.e00            Fault names, U/D, locality numbers, and dip numbers
      se_fold.e00            Fold axes
      se_arws.e00            Landslide arrows
      
      in format ARCE (version 7.x) Size: 68
      Network links: http://pubs.usgs.gov/of/1997/of97-030/mo-se_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/97-30/metadata.faq.html>
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