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Preliminary Geologic Map of the Santa Barbara Coastal Plain Area, Santa Barbara County, California

Metadata also available as - [Outline] - [Parseable text] - [DIF]

Frequently anticipated questions:

What does this data set describe?

Title:
Preliminary Geologic Map of the Santa Barbara Coastal Plain Area, Santa Barbara County, California
Abstract:
This report presents a new geologic digital map of the Santa Barbara coastal plain area at a compilation scale of 1:24,000 (one inch on the map = 2,000 feet on the ground) and with a horizontal positional accuracy of at least 20 m. This preliminary map depicts the distribution of bedrock units and surficial deposits and associated deformation underlying and adjacent to the coastal plain within the contiguous Santa Barbara and Goleta 7.5' quadrangles. A planned second version will extend the mapping westward into the adjoining Dos Pueblos Canyon quadrangle and eastward into the Carpinteria quadrangle. The mapping presented here results from the collaborative efforts of geologists with the U.S. Geological Survey Southern California Areal Mapping Project (SCAMP) (Minor, Kellogg, Stanley, Stone, and Powell) and the tectonic geomorphology research group at the University of California at Santa Barbara (Gurrola and Selting). C.L. Powell, II, performed all new fossil identifications and interpretations reported herein. T.R. Brandt designed and edited the GIS database,performed GIS database integration and created the digital cartography for the map layout.
The Santa Barbara coastal plain is located in the western Transverse Ranges physiographic province along a west-trending segment of the southern California coastline about 100 km (62 mi) northwest of Los Angeles. The coastal plain region, which extends from the Santa Ynez Mountains on the north to the Santa Barbara Channel on the south, is underlain by numerous active and potentially active folds and partly buried thrust faults of the Santa Barbara fold and fault belt. Strong earthquakes that occurred in the region in 1925 (6.8 magnitude) and 1978 (5.1 magnitude) are evidence that such structures pose a significant earthquake hazard to the approximately 200,000 people living within the major coastal population centers of Santa Barbara and Goleta. Also, young landslide deposits along the steep lower flank of the Santa Ynez Mountains indicate the potential for continued slope failures and mass movements that may threaten urbanized parts of the coastal plain. Deformed sedimentary rocks in the subsurface of the coastal plain and the adjacent Santa Barbara Channel contain deposits of oil and gas, some of which are currently being extracted. Shallow, localized sedimentary aquifers underlying the coastal plain provide limited amounts of water for the urban areas, but the quality of some of this groundwater is compromised by coastal salt-water contamination. The present map compilation provides a set of uniform geologic digital coverages that can be used for analysis and prediction of these and other geologic hazards and resources in the coastal plain region.
In the map area the oldest stratigraphic units consist of resistant Eocene to Oligocene marine and terrestrial sedimentary rocks that form a mostly southward-dipping and laterally continuous sequence along the south flank of the Santa Ynez Mountains. Less resistant, but more variably deformed, Miocene, Pliocene, and Pleistocene marine sedimentary rocks and deposits are exposed in the lower Santa Ynez foothills and in the coastal hills and sea cliffs farther south. Pleistocene and Holocene surficial alluvial, colluvial, estuarine, and marine-terrace deposits directly underlie much of the low-lying coastal plain area, and similar-aged alluvial and landslide deposits locally mantle the lower flanks of the Santa Ynez Mountains.
Structurally, the Santa Barbara coastal plain area is dominated by the Santa Barbara fold and fault belt, an east-west-trending zone of Quaternary, partly active folds and blind and exposed reverse and thrust faults. The dominant trend of individual structures within the belt is west-northwest -- slightly oblique to the overall trend of the fold and fault belt. A conspicuous exception, however, is the More Ranch fault system, which strikes east-northeast across the fold and fault belt at a high angle to the dominant structural grain. Based on a limited number of observations made at rare fault-plane exposures, most of the map-scale faults in the coastal plain area are moderately to steeply dipping and have most recently experienced reverse or reverse-oblique slip. Multiple sets of slip lineations, including strike-slip and, rarely, normal-slip striae, are commonly preserved on the fault planes, however, indicating that many of the faults have a varied, complex movement history.
Several folds within older alluvial deposits have strong geomorphic expression that is consistent with a youthful age of deformation; commonly anticlines are coincident with elongate ridges or hills whereas synclines coincide with valleys or swales. The most dramatic example of such a geomorphic-structural correlation is Mission Ridge just north of downtown Santa Barbara, which is coincident with an anticline that is paired on its north side with a syncline that roughly follows a linear valley. On the basis of several lines of geomorphic evidence previous investigators have inferred that the Mission Ridge upwarp is a fault-related fold that has propagated westward, reflecting westward propagation of the Mission Ridge fault and resulting in progressive westward deflection of Mission Creek. Several folds in the map area, including the Mission Ridge anticlinal upwarp and folds just west of the Santa Barbara Harbor, are inferred to be underlain by blind reverse and thrust faults. Other fold axes on the coastal plain are parallel to adjacent fault traces, and in such cases the fold on the apparent upthrown, hanging-wall side of the fault is typically an asymmetric anticline whose steeper limb faces the fault. Nearly all asymmetric anticlines in the map area have northward vergence, suggesting that most associated blind reverse-thrust faults are dominantly southward dipping similar to the exposed faults and, thus, have accommodated northward tectonic transport of their hanging-wall blocks. Such structural geometry is consistent with fault-propagation folding and, together with evidence of dominant reverse fault slip, implies that faults in the map area have accommodated significant contractional strain during the Pleistocene.
Most of the structures in the fold and fault belt deform deposits as young as middle to late Pleistocene, but many of the west-northwest- striking faults in the northwest part of the map area do not cut the oldest alluvial deposits or they offset such deposits a significantly lesser amount than the underlying bedrock units. These relations, and a moderate angular discordance that locally exists between the middle Pleistocene Santa Barbara Formation and overlying older alluvial deposits, indicate that pre-alluvial, possibly middle Pleistocene, deformation occurred locally along structures that were partly reactivated later in the Pleistocene. An erosional angular unconformity that separates the Sisquoc Formation and older units from the Santa Barbara Formation and partly coeval deposits suggests that significant uplift and deformation occurred in the coastal area in the Pliocene. One or more of these earlier deformational episodes may have been coeval with the formation of numerous northwest- trending folds and faults in the Monterey Formation along the sea cliffs between Santa Barbara Point and Arroyo Burro; these structures clearly predate unconformably overlying, cliff-capping marine terrace deposits. Possible age-equivalent folds also deform the Monterey in Sycamore Canyon area in the east part of the map area. The late Pleistocene marine terrace deposits, although uplifted and locally warped or gently folded, are clearly not as strongly deformed as the older Pleistocene deposits and underlying bedrock, and no significant deformation has been recognized in the mapped Holocene deposits despite the historic earthquake activity in the region. Collectively, these various structural age relations imply that deformation in the coastal plain area was most pronounced during the Pliocene and (or) Pleistocene prior to formation of the marine terraces in the late Pleistocene.
Supplemental_Information:
Compilation scale: 1:24,000
Base maps used are the U.S. Geological Survey 7.5 minute topographic quadrangles for Goleta, Calif. and Santa Barbara, Calif. .
Mapping is continuing in adjacent quadrangles and a more complete final map of this area at an identical scale may eventually be produced.
  1. How should this data set be cited?

    Minor, Scott A. , Kellogg, Karl S. , Stanley, Richard G. , Stone, Paul, Charles L. Powell, II, Gurrola, Larry D. , Selting, Amy J. , and Brandt, Theodore R. , 2002, Preliminary Geologic Map of the Santa Barbara Coastal Plain Area, Santa Barbara County, California: U.S. Geological Survey Open-File Report 02-136, U.S. Geological Survey, Denver, Colorado.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -119.875
    East_Bounding_Coordinate: -119.625
    North_Bounding_Coordinate: 34.5
    South_Bounding_Coordinate: 34.375

  3. What does it look like?

    <http://geo-nsdi.er.usgs.gov/metadata/open-file/02-136/browse.png> (PNG)
    Reduced-size image of the map sheet, 1076x544 pixels, 195k bytes.
    <http://pubs.usgs.gov/of/2002/ofr-02-0136/ofr-02-136_print.pdf> (PDF)
    Printable version of the map sheet, 7.1 megabytes.

  4. Does the data set describe conditions during a particular time period?

    Calendar_Date: 2002
    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?

      The map projection used is Polyconic.

      Projection parameters:
      Longitude_of_Central_Meridian: -119.75
      Latitude_of_Projection_Origin: 34.375
      False_Easting: 0.00000
      False_Northing: 0.00000

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.2
      Ordinates (y-coordinates) are specified to the nearest 0.2
      Planar coordinates are specified in Meters

      The horizontal datum used is North American Datum of 1927.
      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?

    Entity_and_Attribute_Overview:
    The data is supplied in ARC/INFO export format and as shapefiles. This overview describes the coverage data found in the export files.
    DATABASE STRUCTURE - ARC/INFO ====================================
    This GIS database includes related look-up tables, which store detailed attribute information. This database structure is more fully described in USGS OFR 99-438. The GIS database structure used in database includes symbol and pattern items in coverage point, polygon (PAT) and arc (AAT)attribute tables for user convenience. Arc/Info relates for each coverage are saved in a file named <covername>.rel. Use the RELATE command with the restore argument at the arc prompt to make the relates active. Alternatively, in Arctools, use the Relate environment: open dialog in the Manage - Relates flyout menu under the Arctools menu to make the relates active.
    sbgeos coverage: Contains all contact lines and label points for each geologic polygon. In the sbgeos.pat INFO file the UNIT item indicates the numeric code used to identify the rock unit, which is described in the sbgeos.ru look-up table. The SOURCE item provides a numeric code used to identify the data source for the rock unit. Complete references for the sources listed are listed in the sbgeos.ref file. The LABEL item indicates the rock unit label (abbreviation) used to label unit on map. The DESC item defines formal or informal unit name.
    In the coverage's sbgeos.aat INFO file the LINECODE item provides a numeric code used to identify type of linear feature. Linecodes < 100 are used for contacts and boundaries which are described in the sbgeos.con file. The NAME item lists the name given to structural feature. The SOURCE item lists the numeric code used to identify the data source for the linear feature. Complete references for the sources are listed in the sbgeos.ref file.
    Related look-up table files are sbgeos.con, sbgeos.str, sbgeos.ru, and sbgeos.ref. In the sbgeos.con INFO file, the LINECODE item indicates the numeric code (a value < 100) used to identify type of contact or boundary. The SYMBOL item lists the line symbol number used by Arc/Info to plot the line (Symbol numbers refer to the geol_sfo.lin lineset). The TYPE item lists the major type of line, e.g., contact, state boundaries, lines of latitude and longitude used for neatlines. The MODIFIER item lists the line-type modifier, i.e., approximate, concealed, or gradational. No entry implies 'known.' The CERTAINTY item lists the degree of certainty of contact or boundary, i.e., inferred or uncertain. No entry implies 'certain.' The DESC item lists the written description or explanation of the contact or boundary. In the sbgeos.str INFO file, the LINECODE item indicates the numeric code (a value < 100) used to identify type of contact or boundary. The SYMBOL item lists the line symbol number used by Arc/Info to plot the line (Symbol numbers refer to the geol_sfo.lin lineset). The TYPE item lists the major type of line, e.g., fault, or fold-axis. The HORIZONTAL item refers to the type of horizontal fault movement, e.g., left-lateral, right-lateral. No entry implies 'unknown.' The VERTICAL item refers to the type of vertical fault movement, e.g., normal. No entry implies 'unknown.' The FOLD item refers to the type of fold, e.g., anticline, syncline. The PLUNGE item refers to the type of plunge on fold, i.e., horizontal, plunging, plunging in, plunging out. The ACCURACY item refers to the line type modifier indicating degree of accuracy, i.e., approximately located, concealed, gradational. No entry implies 'certain.' The CERTAINTY item lists the degree of certainty of contact or boundary, i.e., inferred or uncertain. No entry implies 'certain.' The DESC item lists the written description or explanation of the contact or boundary. In the sbgeos.ru INFO file, the UNIT item refers to the numeric code used to identify the rock unit. The LABEL item refers to the rock unit label (abbreviation) used to label unit on map. The DESC item lists the formal or informal unit name. In the sbgeos.ref INFO file, the SOURCE item lists the numeric code used to identify the data source. The SCALE item lists the scale of the source map. (This value is the denominator of the proportional fraction that identifies the scale of the map that was digitized or scanned to produce the digital map.) The AUTHORS item lists the author(s) or compiler(s) of source map entered as last name, first name or initial, and middle initial. The YEAR item lists the source (map) publication date. The REFERENCE item lists the remainder of the reference in USGS reference format.
    The INFO structure of these files is listed below: 
    SBGEOS.PAT:

COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
    1  AREA                   8    18     F      5
    9  PERIMETER              8    18     F      5
   17  SBGEOS#                4     5     B      -
   21  SBGEOS-ID              4     5     B      -
   25  UNIT                   4     4     I      -
   29  SOURCE                 4     4     I      -
   33  LABEL                 10    10     C      -
   43  DESC                 100   100     C      -
  143  SYMBOL                 3     3     I      -


SBGEOS.AAT:

COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
    1  FNODE#                 4     5     B      -
    5  TNODE#                 4     5     B      -
    9  LPOLY#                 4     5     B      -
   13  RPOLY#                 4     5     B      -
   17  LENGTH                 8    18     F      5
   25  SBGEOS#                4     5     B      -
   29  SBGEOS-ID              4     5     B      -
   33  LINECODE               3     3     I      -
   36  NAME                  80    80     C      -
  116  SOURCE                 4     4     I      -
  120  SYMBOL                 3     3     I      -

SBGEOS.CON:

COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
    1  LINECODE               3     3     I      -
    4  SYMBOL                 3     3     I      -
    7  TYPE                  10    10     C      -
   17  MODIFIER              20    20     C      -
   37  CERTAINTY             15    15     C      -
   52  DESC                 100   100     C      -

SBGEOS.STR:

COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
    1  LINECODE               3     3     I      -
    4  SYMBOL                 3     3     I      -
    7  TYPE                  10    10     C      -
   17  HORIZONTAL            20    20     C      -
   37  VERTICAL              20    20     C      -
   57  FOLD                  15    15     C      -
   72  PLUNGE                15    15     C      -
   87  ACCURACY              15    15     C      -
  102  CERTAINTY             15    15     C      -
  117  DESC                 100   100     C      -

SBGEOS.RU:

COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
    1  UNIT                   4     4     I      -
    5  LABEL                 10    10     C      -
   15  DESC                 250   250     C      -

SBGEOS.REF:

COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
    1  SOURCE                 4     4     I      -
    5  SCALE                  8     8     I      -
   13  AUTHORS              200   200     C      -
  213  YEAR                   4     4     I      -
  217  REFERENCE            250   250     C      -
    sbpnt coverage: Contains points recording site-specific observations and measurements, such as strike and dip of bedding. In the sbpnt.pat INFO file the PTTYPE item lists the type of point symbol, e.g., strike and of inclined bedding. The SYMBOL item lists the marker symbol used by ArcInfo to identify the type of structural map symbol(Symbol numbers refer to the geoscamp2.mrk markerset). The STRIKE item contains the strike of bedding as well as trend of fold axis, where applicable. Strike is an azimuthal angle. Measured in degrees from 0 to 360 in a clockwise direction from North, the STRIKE value also specifies the dip direction, where the dip direction is 90 degrees clockwise relative to the STRIKE. The DIP item contains the dip of bedding as well as plunge angles, where applicable. This value is an angle measured (in degrees 0 to 90) down from the horizontal; thus a horizontal dip is 0 degrees and a vertical dip is 90 degrees.
    In the coverage's sbpnt.ref INFO file the SOURCE item lists the numeric code used to identify the data source. The scale item lists the scale of the source map. (This value is the denominator of the proportional fraction that identifies the scale of the map that was digitized or scanned to produce the digital map.) The AUTHORS item lists the author(s) or compiler(s) of source map entered as last name, first name or initial, and middle initial. The YEAR item lists the source (map) publication date. The REFERENCE item lists the remainder of the reference in USGS reference format. 
    SBPNT.PAT
COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
     1  AREA                   8    18     F      5
     9  PERIMETER              8    18     F      5
    17  SBPNT#                 4     5     B      -
    21  SBPNT-ID               4     5     B      -
    25  PTTYPE               100   100     C      -
   125  SYMBOL                 3     3     I      -
   128  STRIKE                 3     3     I      -
   131  DIP                    3     3     I      -
   142  SOURCE                 4     4     I      -

SBPNT.REF:

COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
    1  SOURCE                 4     4     I      -
    5  SCALE                  8     8     I      -
   13  AUTHORS              200   200     C      -
  213  YEAR                   4     4     I      -
  217  REFERENCE            250   250     C      -
    sbminpnt coverage: Contains points recording site-specific observations and measurements not displayed on the map, such as minor anticlines, minor fault attitudes, minor folds, minor synclines, and slip lineations on minor faults. In the sbminpnt.pat INFO file the PTTYPE item lists the type of point symbol, e.g., strike and of inclined bedding. The SYMBOL item lists the marker symbol used by ArcInfo to identify the type of structural map symbol(Symbol numbers refer to the geoscamp2.mrk markerset). The STRIKE item contains the strike of bedding as well as trend of fold axis, where applicable. Strike is an azimuthal angle. Measured in degrees from 0 to 360 in a clockwise direction from North, the STRIKE value also specifies the dip direction, where the dip direction is 90 degrees clockwise relative to the STRIKE. The DIP item contains the dip of bedding as well as plunge angles, where applicable. This value is an angle measured (in degrees 0 to 90) down from the horizontal; thus a horizontal dip is 0 degrees and a vertical dip is 90 degrees. 
    SBMINPNT.PAT
COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
1     AREA                   8    18     F      5
9     PERIMETER              8    18     F      5
17    SBMINPNT#              4     5     B      -
21    SBMINPNT-ID            4     5     B      -
25    PTTYPE               100   100     C      -
125   SYMBOL                 3     3     I      -
128   STRIKE                 3     3     I      -
131   DIP                    3     3     I      -
142   SOURCE                 4     4     I      -

SBMINPNT.REF:

COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
    1  SOURCE                 4     4     I      -
    5  SCALE                  8     8     I      -
   13  AUTHORS              200   200     C      -
  213  YEAR                   4     4     I      -
  217  REFERENCE            250   250     C      -
    Auxiliary files:
    geol_sfo.lin: This lineset file defines geologic line types in the geologically themed coverages.
    geoscamp2.mrk: This markerset file defines the geologic markers in the geologically themed coverages.
    wpgcmykg.shd: This shadeset file defines the cmyk values of colors assigned to polygons in the geologically themed coverages.
    ofr-02-136_print.pdf: A print optimized file for viewing and printing a graphics version of the map and accessory elements using Adobe Acrobat viewing software (version 5.0). (Adobe Acrobat 5.0 viewing software is free and can be downloaded at the following URL: <http://www.adobe.com/products/acrobat/readstep2.html>)

    Coding of UNIT, LABEL, and DESC attributes in the sbgeos coverage: 
    UNIT |  LABEL        |  DESC
0    |  Unmapped     |  Unmapped area
1    |  af           |  Artificial fill (Holocene)
2    |  Qa           |  Active channel alluvium (Holocene)
3    |  Qb           |  Beach deposits (Holocene)
4    |  Qe           |  Estuarine deposits (Holocene)
5    |  Qas          |  Asphalt deposits (Holocene)
6    |  Qac          |  Alluvium and colluvium (Holocene and upper Pleistocene)
7    |  Qc           |  Colluvium (Holocene and upper Pleistocene)
9    |  Qls          |  Landslide deposits (Holocene and upper Pleistocene)
10   |  Qdf          |  Debris flow deposits (Holocene and/or upper Pleistocene)
11   |  Qtc          |  Travertine and/or caliche deposits (Holocene? and Pleistocene?)
12   |  Qia          |  Intermediate alluvial deposits (upper Pleistocene)
13   |  Qmt          |  Marine terrace deposits (upper Pleistocene)
14   |  Qoa          |  Older alluvial deposits (upper and middle Pleistocene)
15   |  Qsb          |  Santa Barbara Formation (middle Pleistocene)
16   |  Qsb?         |  Santa Barbara Formation, uncertain (middle Pleistocene)
17   |  Qcg          |  Conglomeratic unit (middle Pleistocene?)
18   |  Qss          |  Sandstone unit (middle Pleistocene?)
19   |  QTst         |  Siltstone unit (lower Pleistocene and/or upper Pliocene)
20   |  Tsq          |  Sisquoc Formation (Pliocene? and upper Miocene)
22   |  Tm           |  Monterey Formation (Miocene)
23   |  Tmu          |  Monterey Formation, upper diatomaceous unit (upper Miocene)
24   |  Tmm          |  Monterey Formation, middle shale unit (upper and middle? Miocene)
25   |  Tml          |  Monterey Formation, lower calcareous unit (middle and lower Miocene)
26   |  Tr           |  Rincon Shale (lower Miocene)
27   |  Trs          |  Rincon Shale, siliceous shale interval (lower Miocene)
28   |  Tv           |  Vaqueros Formation (upper Oligocene)
29   |  Tspu         |  Sespe Formation, upper sandstone and mudstone unit (upper Oligocene)
30   |  Tspl         |  Sespe Formation, lower conglomerate and sandstone unit (upper Oligocene and upper Eocene?)
31   |  Tg           |  Gaviota Formation, (upper Eocene)
32   |  Tcw          |  Coldwater Sandstone (upper and/or middle Eocene)
33   |  Open water   |  Open water
34   |  Qoa?         |  Older alluvial deposits, uncertain (upper and middle Pleistocene)
36   |  Qmt?         |  Marine terrace deposits, uncertain (upper Pleistocene)
37   |  QTst?        |  Siltstone unit (lower Pleistocene and/or upper Pliocene)
    Coding of NAME attributes in the sbgeos coverage: 
    LINECODE |  LABEL
      402|Anticline - Approximately located
      401|Anticline - Certain
      403|Anticline - Concealed
      526|Anticline - Inferred
       85|Beveled surface border
        2|Contact - Approximately located
        1|Contact - Certain
        3|Contact - Concealed
       20|Contact - Inferred
       19|Contact - Inferred from 1928 air photos
      531|Downwarp axis - Approximately located
      521|Downwarp axis - Certain
      522|Downwarp axis - Concealed
      530|Downwarp axis - Inferred
      102|Fault - Approximately located
      101|Fault - Certain
      103|Fault - Concealed
      523|Fault - Concealed, from 1928 air photos
      106|Fault - Concealed, queried
      107|Fault - Inferred
      524|Fault - Inferred, from 1928 air photos
      525|Fault-line scarp
       81|Map boundary
       86|Marine terrace shore line angle
       84|Marine terrace shore line angle - Approximately located
       82|Periphery of mapped units
      414|Syncline - Approximately located
      413|Syncline - Certain
      415|Syncline - Concealed
      527|Syncline - Inferred
      172|Thrust fault - Approximately located
      171|Thrust fault - Certain
      173|Thrust fault - Concealed
      177|Thrust fault - Inferred
      532|Upwarp axis - Approximately located
      519|Upwarp axis - Certain
      520|Upwarp axis - Concealed
      529|Upwarp axis - Inferred
       41|Water body
Coding of PTTYPE in the sbpnt coverage:
Arrow showing direction of fold plunge
Fault attitude - Showing strike and dip
Horizontal bedding
Inclined bedding - Showing approximate strike and direction of dip
Inclined bedding - Showing strike and dip
Inclined joint - Showing strike and dip
Overturned bedding - Showing strike and dip
Qas - Asphalt deposits
Slip lineation on a fault - Showing bearing and plunge
Vertical bedding - Showing strike
Coding of PTTYPE in the sbminpnt coverage:
Minor anticline - Showing bearing and plunge
Minor fault attitude - Showing strike and dip
Minor folds - Showing bearing and plunge
Minor syncline - Showing bearing and plunge
Slip lineation on a minor fault - Showing bearing and plunge
    Entity_and_Attribute_Detail_Citation: <http://pubs.usgs.gov/of/2002/ofr-02-0136/ofr-02-136_pam.pdf>

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?

    Tim Tierney and the UCSB Mapping and Imagery Library provided excellent computer and software support during our field stints. Dr. Ed Keller of the UCSB Institute for Crustal Studies was instrumental in developing scientific collaboration with his tectonic geomorphology research group, and has been an enthusiastic supporter of our work throughout the mapping campaign. The constructive review by Bob Bohannon of the USGS improved the quality of the map and text. We also thank the late Helmet Ehrenspeck of the Dibblee Foundation for his gracious endorsement of our new mapping and his selfless devotion to the promotion and dissemination of Tom Dibblee's great works. He will be sorely missed not only by us but also by the entire earth science community. Finally, Tom Dibblee is due special acknowledgment for his numerous pioneering and far-reaching contributions to our understanding of the geology of the Santa Barbara region and of southern California in general. Specifically, his earlier geologic mapping in the Santa Barbara coastal plain region formed an invaluable foundation for our current mapping efforts.

  3. To whom should users address questions about the data?

    Scott A. Minor
    U.S. Geological Survey
    P.O. Box 25046, MS 913
    Denver, CO 80225-0046
    USA

    303-236-0303 (voice)
    sminor@usgs.gov

Why was the data set created?

To update the interpretation of geologic mapping and to achieve a uniform regional geologic database. Additionally, to provide a geologic map for the public and geoscience community to aid in assessments and mitigation of geologic hazards in the Santa Barbara coastal plain region and to provide sufficient geologic information for land-use and land-management decisions.

How was the data set created?

  1. From what previous works were the data drawn?

    Keller and Gurrola (2000) (source 1 of 2)
    Keller, E.A., and Gurrola, L.D., 2000, Final report, July, 2000, Earthquake hazard of the Santa Barbara fold belt, California: NEHRP Report Final.

    Other_Citation_Details: online at <http://www.geol.ucsb.edu/~keller/sbeqh.pdf>
    Type_of_Source_Media: electronic
    Source_Contribution: information used in compilation of map

    Gurrola and others (2001) (source 2 of 2)
    Gurrola, L.D., Selting, A.J., Keller, E.A., Tierney, T.E., Hartleb, R.D., Trecker, M.A., and Dibblee, T.W., Jr., 2001, Neotectonics of the Santa Barbara fold belt, California, with a section on Investigation of the Mission debris flow deposit, Santa Barbara, California, by A.J. Selting, A.J. and R.J. Urban, in Dunne, G., and Cooper, J., compilers, Geologic excursions in southwestern California: Society of Economic Paleontologists and Mineralogists, Pacific Section book 89.

    Other_Citation_Details: p. 21-100
    Type_of_Source_Media: paper
    Source_Contribution: information used in compilation of map

  2. How were the data generated, processed, and modified?

    Date: 2001 (process 1 of 11)
    Geology was mapped during the period 1999 to 2001.

    Date: 2001 (process 2 of 11)
    Part of the geologic database was digitized using the GSMCAD public domain program (USGS Open-File Report 96-007).

    Date: 2001 (process 3 of 11)
    Part of the geologic database was digitized using Adobe Illustrator commercial software

    Date: 2001 (process 4 of 11)
    Part of the geologic database was digitized by digital scanning of map linework drawn on stable-base mylars.

    Date: 2001 (process 5 of 11)
    That part of the geologic database digitized in GSMCAD was exported to ESRI ARCVIEW commercial software by conversion first to ARC generate ASCII files and then to ARCVIEW shape files.

    Date: 2001 (process 6 of 11)
    Those parts of the geologic database digitized in Adobe Illustrator or by scanning were exported to ARC/INFO commercial GIS software, converted to coverages, and exported to ARCVIEW as shape files.

    Date: 2001 (process 7 of 11)
    Separately imported parts of geologic database were merged and edited in ARCVIEW and then exported to ARC/INFO as coverages.

    Date: 2001 (process 8 of 11)
    Geologic polygon, line, and point features were attributed in ARC/INFO.

    Date: 2001 (process 9 of 11)
    CODE, P1, and P2 values inherited from GSMCAD were dropped from each cover or renamed to more descriptive attribute names where appropriate.

    Date: 2001 (process 10 of 11)
    Checkplots of the coverages were printed and checked against source materials for accuracy and completeness. The database information was checked visually and using various routines in ArcInfo for accuracy and consistency.

    Date: 2001 (process 11 of 11)
    First draft of metadata created by Ted Brandt using FGDCMETA.AML ver. 1.2 05/14/98 on ARC/INFO data set sbgeos

  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?

    Data were entered and checked by the geologist that made the field observations. The attributes of this geospatial data set consist of text identifiers and numeric codes that indicate the identity of the geologic unit or type of geologic feature, and determine how each feature is colored or symbolized. To check attribute accuracy, a color check plot was visually compared to the geologist's original compilation. Discrepancies between the digital geospatial dataset and the original analog or digital compilation were corrected as needed. Machine-created listings of unique attribute values were used to identify spelling errors or other inconsistencies, and corrections were made as needed.

  2. How accurate are the geographic locations?

    Lines were primarily mapped by one of the following methods: (1) photo-interpretation and annotation of ~1:24,000-scale color (1999) and black-and-white (1928) aerial photographs; or (2) annotation of 1:24,000-scale topographic base maps. Most point observation locations were determined in the field using hand-held GPS receivers with horizontal accuracy of about 10 m. Map data were digitized by one of the following methods: (1) heads-up screen digitization of line data mapped on aerial photographs using rectified and georeferenced digital orthophoto quarter quadrangles (DOQQ's) with ground resolution of 1 meter; (2) heads-up screen digitization of mapped data using raster images of topographic base maps to an estimated horizontal accuracy of about 10 m; (3) digitization of photo-interpreted map data using a digital PG-2 photogrammetric plotter that rectifies and georeferences the data to a horizontal accuracy of about 10 m; (4) digitization of data mapped directly on scale-stable copies of the topographic base maps using a digitizer tablet with a resolution of 0.001 inch and an estimated horizontal accuracy of at least 10 m; or (5) scanning and vectorization of map data on scale-stable mylars registered to the base maps. Most digitized positions on the map are estimated to have better than 20 m horizontal accuracy. There is no elevation data in the database.

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

    Data are complete: no features that could be accurately represented at the compilation scale of 1:24,000 were eliminated or generalized. The smallest area represented is approximately 110 square meters. All geospatial database elements are attributed.

  5. How consistent are the relationships among the observations, including topology?

    Map elements were visually checked for overshoots, undershoots, duplicate features, polygon closure, and other errors by the lead author and by the GIS technician(s) that created the digital database. Automated (ArcInfo) routines were also used to check the databases for polygon label errors, line or point attribution errors, sliver polygons, dangling arcs, intersection errors, and projection information. Check plots of the map were reviewed by at least one other geologist for consistency with basic geologic principles and general conformity to USGS mapping standards.

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. Acknowledgment of the U.S. Geological Survey would be appreciated in products derived from these data.

  1. Who distributes the data set? (Distributor 1 of 2)

    U.S. Geological Survey
    Central Publications Group
    Lakewood, CO 80225-0046
    USA

    303-236-5486 (voice)

  2. What's the catalog number I need to order this data set?

    USGS Open-File Report 02-136

  3. What legal disclaimers am I supposed to read?

    Although these digital spatial data have been subjected to rigorous review and are substantially complete, they are released on the condition that neither the USGS nor the United States Government may be held liable for any damages resulting from their authorized or unauthorized use.

  4. How can I download or order the data?

  1. Who distributes the data set? (Distributor 2 of 2)

    U.S. Geological Survey
    USGS Information Services
    Denver, CO 80225
    USA

    (888) ASK-USGS (voice)

  2. What's the catalog number I need to order this data set?

    OFR-02-136

  3. What legal disclaimers am I supposed to read?

    none

  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 19-Aug-2009
Metadata author:
Minor, Scott
U.S. Geological Survey
Mail Stop 913, USGS
Box 25046, Denver Federal Center
Denver, CO 80225-0046
US

303-236-0303 (voice)
sminor@usgs.gov

Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)

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