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Geologic Map of the Cucamonga Peak 7.5' quadrangle, San Bernardino County, California

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

Frequently anticipated questions:

What does this data set describe?

Title:
Geologic Map of the Cucamonga Peak 7.5' quadrangle, San Bernardino County, California
Abstract:
This data set maps and describes the geology of the Cucamonga Peak 7.5' quadrangle, San Bernardino County, California. Created using Environmental Systems Research Institute's ARC/INFO software, the database consists of the following items: (1) a map coverage containing geologic contacts and units, (2) a coverage containing site-specific structural data, (3) a coverage containing geologic-unit label leaders and their associated attribute tables for geologic units (polygons), contacts (arcs), and site-specific data (points). In addition, the data set includes the following graphic and text products: (1) A PostScript graphic plot-file containing the geologic map, topography, cultural data, a Correlation of Map Units (CMU) diagram, a Description of Map Units (DMU), an index map, a regional geologic and structure map, and a key for point and line symbols; (2) PDF files of this Readme (including the metadata file as an appendix) and the graphic produced by the PostScript plot file.
The Cucamonga Peak quadrangle includes part of the boundary between two major physiographic provinces of California, the Transverse Ranges Province to the north and the Peninsular Ranges Province to the south. The north part of the quadrangle is in the eastern San Gabriel Mountains, and the southern part includes an extensive Quaternary alluvial-fan complex flanking the upper Santa Ana River valley, the northernmost part of the Peninsular Ranges Province.
Thrust faults of the active Cucamonga Fault zone along the the south margin of the San Gabriel Mountains are the rejuvenated eastern terminus of a major old fault zone that bounds the south side of the western and central Transverse Ranges (Morton and Matti, 1993). Rejuvenation of this old fault zone, including the Cucamonga Fault zone, is apparently in response to compression in the eastern San Gabriel Mountains resulting from initiation of right-lateral slip on the San Jacinto Fault zone in the Peninsular Ranges. Within the northern part of the quadrangle are several arcuate-in-plan faults that are part of an antiformal, schuppen-like fault complex of the eastern San Gabriel Mountains. Most of these arcuate faults are reactivated and deformed older faults that probably include the eastern part of the San Gabriel Fault.
The structural grain within the San Gabriel Mountains, as defined by basement rocks, is generally east striking. Within the Cucamonga Peak quadrangle, these basement rocks include a Paleozoic schist and gneiss sequence which occurs as large, continuous and discontinuous bodies intruded by Cretaceous granitic rocks. Most of the granitic rocks are of tonalitic composition, and many are mylonitic. South of the granitic rocks is a comple assemblage of Proterozoic(?) metamorphic rocks, at least part of which is metasedimentary. This assemblage is intruded by Cretaceous tonalite on its north side, and by charnockitic rocks near the center of the mass. The charnockitic rocks are in contact with no other Cretaceous granitic rocks. Consequently, their relative position in the intrusive sequence is unknown. The Proterozoic(?) assemblage was metamorphosed to upper amphibolite and lower granulite grade, and subsequently to a lower metamorphic grade. It is also intensely deformed by mylonitization characterized by an east-striking, north-dipping foliation, and by a pronounced subhorizontal lineation that plunges shallowly east and west.
The southern half of the quadrangle is dominated by extensive, symmetrical alluvial-fan complexes, particularly two emanating from Day and Deer Canyons. Other Quaternary units ranging from early Pleistocene to recent are mapped, and represent alluvial-fan, landslide, talus, and wash environments.
The geologic map database contains original U.S. Geological Survey data generated by detailed field observation and by interpretation of aerial photographs. This digital Open-File map supercedes an older analog Open-File map of the quadrangle, and includes extensive new data on the Quaternary deposits, and revises some fault and bedrock distribution within the San Gabriel Mountains. The digital map was compiled on a base-stable cronoflex copy of the Cucamonga Peak 7.5' topographic base and then scribed. This scribe guide was used to make a 0.007 mil blackline clear-film, from which lines and point were hand digitized. Lines, points, and polygons were subsequently edited at the USGS using standard ARC/INFO commands. Digitizing and editing artifacts significant enough to display at a scale of 1:24,000 were corrected. Within the database, geologic contacts are represented as lines (arcs), geologic units as polygons, and site-specific data as points. Polygon, arc, and point attribute tables (.pat, .aat, and .pat, respectively) uniquely identify each geologic datum.
  1. How should this data set be cited?

    Morton, Douglas M. , and Matti, Jonathan C. , 2001, Geologic Map of the Cucamonga Peak 7.5' quadrangle, San Bernardino County, California: U.S. Geological Survey Open-File Report 01-311, U.S. Geological Survey, Menlo Park, California.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -117.62509226
    East_Bounding_Coordinate: -117.49990774
    North_Bounding_Coordinate: 34.24999995
    South_Bounding_Coordinate: 34.1249841

  3. What does it look like?

    <http://geopubs.wr.usgs.gov/open-file/of01-311/images/cuc_map.jpg> (JPEG)
    Non-navigable .jpg image of the geologic map, topographic base, Correlation of Map Units, Description of Map Units and key to point and line symbols. 400x406 pixels, 32-bit RGB true color, 45k bytes.
    <http://geopubs.wr.usgs.gov/open-file/of01-311/cuc_map.pdf> (PDF)
    Navigable portable document file (.pdf) image of the geologic map, topographic base, Correlation of Map Units, Description of Map Units and key to point and line symbols. 3.3 megabytes.

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

    Beginning_Date: 01-Apr-1974
    Ending_Date: 01-Aug-1981
    Currentness_Reference: New data and previously published data

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: vector digital data

  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 (791)
      • String (2131)
      • GT-polygon composed of chains (792)

    2. What coordinate system is used to represent geographic features?

      The map projection used is Polyconic.

      Projection parameters:
      Longitude_of_Central_Meridian: -117.5625
      Latitude_of_Projection_Origin: 34.125
      False_Easting: 0.00000
      False_Northing: 0.00000

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.0027668485417
      Ordinates (y-coordinates) are specified to the nearest 0.0027668485417
      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:
    Version 1.0 of the Cucamonga Peak 7.5' quadrangle comprises three ARC/INFO coverages, of which two contain geologic data, and one contains cartographic features: cuc_geo (geology), cuc_str (structural data), and cuc_ldr (annotation leaders). Two INFO tables, lines.rel and points.rel provide a full description of each of the geologic line and point features in the database. A full source citation is provided in the Entity_and Attribute_Detail_Citation section of this metadata document.
    Geologic data represented by line entities and the polygons they delineate are contained in the coverage CUC_GEO. For display purposes, the geology coverage contains two annotation subclasses: anno.geo contains unit labels, and anno.fault contains formal, fault names.
    Geological point data includes site-specific information describing the types and the orientation of bedding, foliation, and lineations. One annotation subclass is included in the geologic structure coverage, CUC_STR which displays displays the respective dip and plunge values associated with individual point data.
    Entity_and_Attribute_Detail_Citation:
    A complete description of the polygon, line, and point data coding schemes is available in U.S. Geological Survey Open-File Reports OFR 97-859, OFR 97-860, and OFR 97-861 (full source citations follow):
    Matti, J.C., Miller, F.K., Powell, R.E., Kennedy, S.A., Bunyapanasarn, T.P., Koukladas, Catherine, Hauser, R.M., and Cossette, P.M., 1997b, Geologic-point attributes for digital geologic-map databases produced by the Southern California Areal Mapping Project (SCAMP), Version 1.0: U.S.Geological Survey Open-File Report 97-859
    Matti, J.C., Miller, F.K., Powell, R.E., Kennedy, S.A., and Cossette, P.M., 1997c, Geologic-polygon attributes for digital geologic-map databases produced by the Southern California Areal Mapping Project (SCAMP), Version 1.0: U.S.Geological Survey Open-File Report 97-860
    Matti, J.C., Powell, R.E., Miller, F.K., Kennedy, S.A., Ruppert, K.R., Morton, G.L., and Cossette, P.M., 1997a, Geologic-line attributes for digital geologic-map databases produced by the Southern California Areal Mapping Project (SCAMP), Version 1.0: U.S.Geological Survey Open-File Report 97-861
    cuc_geo.pat
    Geologic units (LABL) and their corresponding names (NAME) identified in the Cucamonga Peak 7.5' quadrangle

    LABL
    geologic map unit label, in plain text

    ValueDefinition
    KchCharnockite
    KdDiorite
    KgMonzogranite and granodiorite
    KssTonalite of San Sevaine Lookout
    KssmMylonitized tonalite of San Sevaine Lookout
    Kssm1Tonalite of San Sevaine Lookout, uniform mylonite
    PrmGranulitic gneiss, mylonite, and cataclasite
    PzsSchist and gneiss
    QcVery young colluvial deposits
    Qf1bVery young alluvial-fan deposits, Unit 1
    QfbVery young alluvial-fan deposits, boulder gravel
    QlsVery young landslide deposits
    Qof1Old alluvial-fan deposits, Unit 1
    Qof3Old alluvial-fan deposits, Unit 3
    QvofVery old alluvial-fan deposits
    Qvof1bVery old alluvial-fan deposits, Unit 1, boulder gravel
    Qvof2bVery old alluvial-fan deposits, Unit 2, boulder gravel
    QvofgVery old alluvial-fan deposits, gravel
    QwVery young wash deposits
    QwbVery young wash deposits, boulder gravel
    Qya4Young alluvial-valley deposits, Unit 4
    Qyf1bYoung alluvial-fan deposits, Unit 1, boulder gravel
    Qyf2bYoung alluvial-fan deposits, Unit 2, boulder gravel
    Qyf3Young alluvial-fan deposits, Unit 3
    Qyf4Young alluvial-fan deposits, Unit 4
    Qyf4bYoung alluvial-fan deposits, Unit 4, boulder gravel
    Qyf5bYoung alluvial-fan deposits, Unit 5, boulder gravel
    QyfbYoung alluvial-fan deposits, boulder gravel
    QyfgbYoung alluvial-fan deposits, gravel boulder
    QylsYoung landslide deposits
    QytYoung talus deposits
    TdDacitic rocks
    TtpGranodiorite of Telegraph Peak
    fzCrushed rock in fault zones
    gnmCataclastic gneiss
    mMarble

    PLABL
    Coded geologic map unit label used to generate plot labels with relevant stratigraphic symbols. The geologic units with LABL designating Paleozoic (Pz) and Proterozoic (Pr), have keystroke substitute characters, | and < respectively, that call their corresponding symbols from the Geoage Font Group. Geologic map unit labels will plot on derivative map plots with appropriate stratigraphic symbols if PLABL is used as the source for unit labels. The Geoage Font Group is accessed through geofont.txt. The GeoAge Font Group and relevant information are available by anonymous FTP from: Server: onyx.wr.usgs.gov

    SHDPS
    polygon color (as integer value) from shadeset scamp2.shd (included in the data package)

    SHDFIL
    polygon fill pattern (as integer value) from shadeset geology2.shd

    NAME
    Geologic name of map unit (see list under LABL attribute)

    cuc_geo.aat
    Geologic features such as contacts and faults that bound rock-unit polygons (a complete description of each line type is available in the data table, lines.rel.)

    L-TAG
    Coded alpha-numerical symbol that relates arc to definition of line type in dictionary look-up table (lines.rel). For description of attributes in line classification dictionary, refer to USGS Open-File Report 97-861 (see Entity_and_Attribute_Detail_Citation)

    ValueDefinition
    C18Contact, landslide, certain, location may not meet map accuracy standard
    C19Contact, landslide, inferred, location may not meet map accuracy standard
    C25Landslide contact, crown scarp, location meets map accuracy standard
    C29Contact, sedimentary, certain, location meets map accuracy standard
    C30Contact, sedimentary, certain, location may not meet map accuracy standard
    C31Contact, sedimentary, inferred, location may not meet map accuracy standard
    C37Contact, sedimentary, separates terraced alluvial units, certain, location meets map accuracy standard
    C51Contact, igneous, inferred, location may not meet map accuracy standard
    C59Contact, igneous, gradational, location may not meet map accuracy standard
    C66Contact, metamorphic, certain, location may not meet map accuracy standard
    C67Contact, metamorphic, inferred, location may not meet map accuracy standard
    C96Contact, generic,scratch boundary
    CL1Cartographic line, map boundary
    F1Fault, high angle, slip unspecified, location meets map accuracy standard
    F2Fault, high angle, right lateral strike slip, certain, location meets map accuracy standard
    F3Fault, left lateral strike slip, location meets map accuracy standard
    F6Fault, oblique slip, location meets map accuracy standard
    F177Fault, thrust, older over younger, certain, location meets map accuracy standard
    F179Fault, thrust, older over younger, location may not meet map accuracy standard
    F180Fault, thrust, older over younger, concealed, location may not meet map accuracy standard
    F183RFault, thrust, older over younger, questionable, concealed, location may not meet map accuracy standard
    F19Fault, high angle, slip unspecified, concealed, location may not meet map accuracy standard
    F193Fault, thrust, older over younger, scarp, certain, location meets map accuracy standard
    F20Fault, high angle, right lateral strike slip, concealed, location may not meet map accuracy standard
    F21Fault, left lateral strike slip, concealed, location may not meet map accuracy atandard
    F24Fault, oblique slip, concealed, location may not meet map accuracy standard
    F195RFault, thrust, older over younger, scarp, identity questionable, location may not meet map accuracy standard

    L-SYMB
    stores appropriate line symbol value from the lineset geoscamp2.lin

    L-NAME
    Formal name of fault

    cuc_str.pat
    Geological point data includes site-specific information describing the types and the orientation of bedding, foliation, and lineations. One annotation subclass is included in the geologic points coverage, CUC_STR which displays the respective dip and plunge values associated with individual point data.

    P-TAG
    Coded alpha-numerical value that relates point entity to definition of point type in dictionary INFO table, points.rel. For description of attributes in point classification dictionary, refer to USGS Open-File Report 97-859 (see Entity_and_Attribute_Detail_Citation)

    ValueDefinition
    B1Bedding, sedimentary, horizontal
    B2Bedding, sedimentary, inclined
    FC4Direction and dip of fault
    FN42Foliation, metamorphic, inclined
    FN43Foliation, metamorphic, vertical
    L17Lineation, unspecified
    L2Lineation, paleocurrent

    P-SYMB
    Coded integer value that relates point to cartographic point symbol in markerset geoscamp2.mrk

    P-DIP
    Dip of planar feature

    P-STRIKE
    Azimuthal strike of planar feature

    P-DIPDIR
    Azimuthal direction of dip of planar feature

    P-PLUNGE
    Plunge of linear feature

    P-BEARING
    Azimuthal direction of plunge of linear feature

    cuc_ldr.pat
    Annotation leaders

    P-SYMB
    Coded integer value (1) that relates arcs to cartographic line symbol in lineset geoscamp2.lin

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?

    Technical review by Michael Kennedy led to significant improvements that eventually were reflected in aspects of the database, the plot file, and in the description of the geologic units of the Cucamonga Peak 7.5' quadrangle.
    Geologic mapping and digital preparation of this report were sponsored jointly by (1) the National Cooperative Geologic Mapping Program of the U.S. Geological Survey, (2) the California Division of Mines and Geology, and (3) the Southern California Areal Mapping Project (SCAMP). In our digital preparation of the data set, carried out in the SCAMP Geographic Information System laboratory at the University of California, Riverside by Catherine Koukladas, and in the USGS Geographic Information System laboratory of the Mineral Resources Program of the U.S. Geological Survey in Spokane, Washington by Pamela M. Cossette, we received valuable assistance from Rachel Alvarez in Riverside, California, and from Paul C. Hyndman in Spokane, Washington.

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

    Douglas M. Morton
    U.S. Geological Survey, Western Region, Earth Surface Processes Team
    Project geologist
    U.S. Geological Survey
    Department of Earth Science
    University of California, Riverside
    Riverside, California 92521
    United States of America

    (909) 276-6397 (voice)
    (909) 276-6295 (FAX)
    scamp@usgs.gov

Why was the data set created?

The data set for the Cucamonga Peak 7.5' quadrangle has been prepared under the U.S. Geological Survey Southern California Areal Mapping Project (SCAMP) as part of an ongoing effort to develop a regional geologic framework of southern California, and to utilize a Geographical Information System (GIS) format to create regional digital geologic databases. These regional databases are being developed as contributions to the National Geologic Map Database of the National Cooperative Geologic Mapping Program of the USGS.
The digital geologic map database for the Cucamonga Peak 7.5' quadrangle has been created as a general-purpose data set that is applicable to other land-related investigations in the earth and biological sciences. For example, the U.S. Forest Service and the San Bernardino National Forest may use the map and data base as a basic geologic data source for soil studies, mineral resource evaluations, road building, biological surveys, and general forest management. The Cucamonga Peak database is not suitable for site-specific geologic evaluations at scales greater than 1:24,000 (1in = 2,000 ft.).

How was the data set created?

  1. From what previous works were the data drawn?

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

    Date: 1970 (process 1 of 7)
    Field mapping and aerial photograph interpretation; iterative process (D.M. Morton).

    Date: 1989 (process 2 of 7)
    Aerial photograph interpretation and limited field checking; iterative process (J.C. Matti).

    Date: 1978 (process 3 of 7)
    Transfer of geologic linework and point data from field maps and aerial photographs to a scale-stable cartographic base of quadrangle (scribeguide) (D.M. Morton and J.C. Matti).

    Date: 1997 (process 4 of 7)
    Description of Map Units and Correlation of Map Units (D.M. Morton, J.C. Matti).

    Date: 1996 (process 5 of 7)
    The geologic map information was hand digitized from a clear-film, right-reading, 0.007 mil thickness, base-stable blackline positive (made by contact photograph from a scribeguide) of the authors-prepared geologic map at 1:24,000 scale (Catherine Koukladas).

    Date: 1997 (process 6 of 7)
    ARC/INFO database established; cleanup of digitizing artifacts; polygon, arc, and point attribute tables established using model developed for SCAMP coverages. Digitizing and editing artifacts significant enough to display at a scale of 1:24,000 were corrected (P.M. Cossette).

    Date: 18-May-200101 (process 7 of 7)
    First draft of metadata created by Cossette using FGDCMETA.AML ver. 1.2 05/14/98 on ARC/INFO data set /pool5/c/cossette2/cucamonga/cuc_geo423

  3. What similar or related data should the user be aware of?

    Morton, D.M., 1976, Geologic map of the Cucamonga fault zone between San Antonio Canyon and Cajon Creek, southern California: U.S. Geological Survey Open-File Report 76-726, U.S. Geological Survey, Menlo Park, California.

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

  1. How well have the observations been checked?

    Geologic-map units in the Cucamonga Peak quadrangle database were described using standard field methods. Consistent with these methods, the database author has assigned standard geologic attributes to geologic lines, points, and polygons identified in the database.
    Nation-wide geologic-map accuracy standards have not been developed and adopted by the U.S. Geological Survey and other earth-science entities. Until such standards are adopted, the SCAMP project has developed internal map-accuracy standards for 1:24,000-scale geologic maps produced by the project.
    Geologic lines and points on 1:24,000 scale geologic maps are judged to meet SCAMP's internal map-accuracy standards if they are located to within +/-15 meters, relative to topographic or cultural features on the base map.
    Lines and points that meet (or may not meet) this SCAMP internal map-accuracy standard are identified both in the digital database and on derivative geologic-map plots. Within the database, line and point data that are judged to meet the SCAMP internal map-accuracy standard are denoted by the attribute code .MEE. (meets) in the appropriate data table; line and point data that may not meet the SCAMP internal map-accuracy standard are denoted by the attribute code .MNM. (may not meet).
    On any derivative geologic-map plot, line data that are judged to meet the SCAMP internal map-accuracy standard are denoted by solid lines; line data that may not meet the SCAMP internal map-accuracy standard are denoted by dashed or dotted lines. There is no cartographic device for denoting the map-accuracy for geologic-point data (eg. symbols representing bedding, foliation, lineations, etc.).

  2. How accurate are the geographic locations?

    The maximum transformation RMS error acceptable for 7.5' quadrangle transformation and data input is 0.003 (7.6 meters). Horizontal positional accuracy was checked by visual comparison of hard-copy plots with base-stable source data.

  3. How accurate are the heights or depths?

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

    The geologic map and digital database of the Cucamonga Peak 7.5' quadrangle contain new data that have been subjected to rigorous review and are a substantially complete representation of the current state of knowledge concerning the geology of the quadrangle.

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

    Polygon and chain-node topology present.
    The areal extent of the map is represented digitally by an appropriately projected (Polyconic projection), mathematically generated box. Consequently, polygons intersecting the lines that comprise the map boundary are closed by that boundary. Polygons internal to the map boundary are completely enclosed by line segments which are themselves a set of sequentially numbered coordinate pairs. Point data are represented by coordinate pairs.

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:
The Cucamonga Peak 7.5' geologic-map database should be used to evaluate and understand the geologic character of the Cucamonga Peak 7.5' quadrangle as a whole. The data should not be used for purposes of site-specific land-use planning or site-specific geologic evaluations. The database is sufficiently detailed to identify and characterize geologic materials and structures. However, it is not sufficiently detailed for site-specific determinations.
Use of this digital geologic map database 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 compiled and edited at a scale of 1:24,000 means that higher resolution information may not have been uniformly retained 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, although higher resolution data is incorporated in parts of the map, the resolution of the combined output will be limited by the lower resolution data.

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

    U.S. Geological Survey Information Services
    Box 25286 Denver Federal Center
    Denver, CO 80225
    USA

    303-202-4700 (voice)
    303-202-4693 (FAX)

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

  3. What legal disclaimers am I supposed to read?

    The U.S. Geological Survey (USGS) provides these geographic data "as is." The USGS makes no guarantee or warranty concerning the accuracy of information contained in the geographic data. The USGS further makes no warranties, either expressed or implied as to any other matter whatsoever, including, without limitation, the condition of the product, or its fitness for any particular purpose. The burden for determining fitness for use lies entirely with the user. Although these data have been processed successfully on computers at the USGS, no warranty, expressed or implied, is made by the USGS regarding the use of these data on any other system, nor does the fact of distribution constitute or imply any such warranty.
    In no event shall the USGS have any liability whatsoever for payment of any consequential, incidental, indirect, special, or tort damages of any kind, including, but not limited to, any loss of profits arising out of use of or reliance on the geographic data or arising out of the delivery, installation, operation, or support by USGS.
    This digital, geologic map database of the Cucamonga Peak 7.5' quadrangle, 1:24,000 map-scale, and any derivative maps thereof, is not meant to be used or displayed at any scale larger than 1:24,000 (e.g., 1:12,000).

  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 17-Sep-2001
Last Reviewed: 27-Sep-2001
Metadata author:
U.S. Geological Survey
c/o Pamela M. Cossette
Geographer
U.S. Geological Survey
West 904 Riverside Avenue
Spokane, Washington 99201-1087
USA

509-368-3123 (voice)
509-368-3199 (FAX)
pcossette@usgs.gov

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

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