Identification_Information:

  Citation:
    Citation_Information:
      Originator: Michael P. Kennedy
      Originator: Douglas M. Morton
      Publication_Date: 2003
      Title: Preliminary Geologic Map of the Murrieta 7.5' Quadrangle, Riverside County, California
      Edition: Version 1.0
      Geospatial_Data_Presentation_Form: vector digital data
      Series_Information:
        Series_Name: U.S. Geological Survey Open-File Report
        Issue_Identification: USGS OFR 03-189
      Publication_Information:
        Publication_Place: Menlo Park, California
        Publisher: U.S. Geological Survey
      Online_Linkage: URL:http://geopubs.wr.usgs.gov/open-file/of03-189

  Description:

    Abstract:
      The Murrieta quadrangle is located in the northern part of the Peninsular Ranges Province and includes parts of two structural blocks, or structural subdivisions of the province.  The quadrangle is diagonally crossed by the active Elsinore fault zone, a major fault zone of the San Andreas fault system, and separates the Santa Ana Mountains block to the west from the Perris block to the east.  Both blocks are relatively stable internally and within the quadrangle are characterized by the presence of widespread erosional surfaces of low relief.

      The Santa Ana Mountains block, in the Murrieta quadrangle, is underlain by undifferentiated, thick-layered, granular, impure quartzite and well-layered, fissile, phyllitic metamorphic rock of low metamorphic grade.  Both quartzite and phyllitic rocks are Mesozoic.  Unconformably overlying the metamorphic rocks are remnants of basalt flows having relatively unmodified flow surfaces.  The age of the basalt is about 7-8Ma.  Large shallow depressions on the surface of the larger basalt remnants form vernal ponds that contain an endemic flora.  Beneath the basalt the upper part of the metamorphic rocks is deeply weathered.  The weathering appears to be the same as the regional Paleocene saprolitic weathering in southern California.  West of the quadrangle a variable thickness sedimentary rock, physically resembling Paleogene rocks, occurs between the basalt and metamorphic rock.  Where not protected by the basalt, the weathered rock has been removed by erosion.

      The dominant feature on the Perris block in the Murrieta quadrangle is the south half of the Paloma Valley ring complex, part of the composite Peninsular Ranges batholith.  The complex is elliptical in plan view and consists of an older ring-dike with two subsidiary short-arced dikes that were emplaced into gabbro by magmatic stoping.  Small to large stoped blocks of gabbro are common within the ring-dikes.  A younger ring-set of hundreds of thin pegmatite dikes occur largely within the central part of the complex.  These pegmatite dikes were emplaced into a domal fracture system, apparently produced by cauldron subsidence, and include in the center of the complex, a number of flat-floored granophyre bodies.  The granophyre is interpreted to be the result of pressure quenching of pegmatite magma.  Along the eastern edge of the quadrangle is the western part of a large septum of medium metamorphic grade Mesozoic schist.  A dissected basalt flow caps the Hogbacks northeast of Temecula, and represents remnants of a channel filling flow.  Beneath the basalt is a thin deposit of stream gravel.  Having an age of about 10Ma, this basalt is about 2-3Ma older than the basalt flows in the Santa Ana Mountains.

      The Elsinore fault zone forms a complex of pull-apart basins.  The west edge of the fault zone, the Willard Fault, is marked by the high, steep eastern face of the Santa Ana Mountains.  The east side of the zone, the Wildomar Fault, forms a less pronounced physiographic step.  In the center of the quadrangle a major splay of the fault zone, the  Murrieta Hot Springs Fault, strikes east.  Branching of the fault zone causes the development of a broad alluvial valley between the Willard Fault and the Murrieta Hot Springs Fault.  All but the axial part of the zone between the Willard and Wildomar Faults consist of dissected Pleistocene sedimentary units.  The axial part of the zone is underlain by Holocene and latest Pleistocene sedimentary units.
    Purpose: The data set for the Murrieta 7.5' quadrangle was 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 Geographic 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.

    Supplemental_Information: None
  Time_Period_of_Content:
    Time_Period_Information:
      Single_Date/Time:
        Calendar_Date: 2003
    Currentness_Reference: New data

  Status:
    Progress: Complete
    Maintenance_and_Update_Frequency: As needed

  Spatial_Domain:
    Bounding_Coordinates:
      West_Bounding_Coordinate: -117.2500901
      East_Bounding_Coordinate: -117.1249099
      North_Bounding_Coordinate: 33.62499995
      South_Bounding_Coordinate: 33.49998424

  Keywords:
    Theme:
      Theme_Keyword_Thesaurus: None
      Theme_Keyword: geologic map
      Theme_Keyword: geology
      Theme_Keyword: bedrock geology
      Theme_Keyword: fault
    Place:
      Place_Keyword_Thesaurus: None
      Place_Keyword: California
      Place_Keyword: Riverside County
      Place_Keyword: Murrieta 7.5' quadrangle

    Stratum:
      Stratum_Keyword_Thesaurus: None
      Stratum_Keyword: Cretaceous gabbro
      Stratum_Keyword: Cretaceous tonalite
      Stratum_Keyword: Cretaceous granodiorite
      Stratum_Keyword: Mesozoic metamorphics
      Stratum_Keyword: Elsinore Fault
    Temporal:
      Temporal_Keyword_Thesaurus: None
      Temporal_Keyword: Mesozoic
      Temporal_Keyword: Cretaceous
      Temporal_Keyword: Quaternary
      Temporal_Keyword: Elsinore fault
  Access_Constraints: None

  Use_Constraints:
    The Murrieta 7.5' geologic-map database should be used to evaluate and understand the geologic character of the Murrieta 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 many actual and potential geologic hazards represented by faults and landslides and posed by ground subsidence and earthquake-generated ground shaking.  However, it is not sufficiently detailed for site-specific determinations or evaluations of these features.  Faults shown do not take the place of fault-rupture hazard zones designated by the California State Geologist (see Hart, 1988).

    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 most of the map, the resolution of the combined output will be limited by the lower resolution data.


  Point_of_Contact:
    Contact_Information:
      Contact_Person_Primary:
        Contact_Person: Douglas M. Morton
        Contact_Organization: U.S. Geological Survey, Western Region, Earth Surface Processes Team
      Contact_Position: Project Geologist
      Contact_Address:
        Address_Type: mailing address
        Address: U.S. Geological Survey
        Address: Department of Earth Sciences
        Address: University of California, Riverside
        City: Riverside
        State_or_Province: California
        Postal_Code: 92521
        Country: USA
      Contact_Voice_Telephone: (909)276-6397
      Contact_Facsimile_Telephone: (909)276-6295
      Contact_Electronic_Mail_Address: scamp@usgs.gov

  Data_Set_Credit:
    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 Geological Survey, and (3) the Southern California Areal Mapping Project (SCAMP).


  Native_Data_Set_Environment:
    SunOS, 5.7, sun4u UNIX
    ARC/INFO version 7.2.1

  Cross_Reference:
    Citation_Information:
      Originator: Morton, D.M.
      Publication_Date: 1999
      Title: Preliminary digital geologic map of the Santa Ana 30'x60' quadrangle, southern California, version 1.0.
      Geospatial_Data_Presentation_Form: vector digital data
      Series_Information:
        Series_Name: U.S. Geological Survey Open-File Report
        Issue_Identification: USGS OF 99-172
      Publication_Information:
        Publication_Place: Menlo Park, California
        Publisher: U.S. Geological Survey
      Online_Linkage: http://geopubs.wr.usgs.gov/open-file/of99-172

Data_Quality_Information:
  Attribute_Accuracy:
    Attribute_Accuracy_Report:
      Geologic-map units in the Murrieta 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.

      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 (e.g., symbols representing bedding, foliation, lineations, etc.).
  Logical_Consistency_Report:
    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.

  Completeness_Report: The geologic map database of the Murrieta 7.5' quadrangle contains 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.
  Positional_Accuracy:
    Horizontal_Positional_Accuracy:
      Horizontal_Positional_Accuracy_Report: The maximum transformation RMS error acceptable for a 7.5' quadrangle transformation and data input is 0.003 (1.8 meters).  Horizontal positional accuracy was checked by visual comparison of hard-copy plots with base-stable source data.
  Lineage:
    Process_Step:
      Process_Description: Field mapping and aerial photograph interpretation; iterative process (M.P. Kennedy).
      Process_Date: 1975-76

    Process_Step:
      Process_Description: Field mapping and aerial photograph interpretation; iterative process (D.M. Morton).
      Process_Date: 1967-68; 1993

    Process_Step:
      Process_Description: Digitization of geologic linework and point data from a scale-stable cartographic base of quadrangle.  ARC/INFO database established; cleanup of artifacts; polygon, arc, and point attribute tables established.  Digitizing and editing artifacts significant enough to display at a scale of 1:24,000 were corrected (R.M. Alvarez and G. Morton).
      Process_Date: 1999-2001
    Process_Step:
      Process_Description: Description of map units and correlation of map units (R.M. Alvarez).
      Process_Date: 2002
    Process_Step:
      Process_Description: First draft of metadata created by R.M. Alvarez using FGDCMETA.AML ver. 1.2 05/14/98 on ARC/INFO data set /scamp27/murrieta/mur_geo
      Process_Date: 20030319
    Process_Step:
      Process_Description: Metadata and digital review by K.R. Bovard
      Process_Date: 20030327
Spatial_Data_Organization_Information:
  Direct_Spatial_Reference_Method: Vector
  Point_and_Vector_Object_Information:
    SDTS_Terms_Description:
      SDTS_Point_and_Vector_Object_Type: Point
      Point_and_Vector_Object_Count: 486

    SDTS_Terms_Description:
      SDTS_Point_and_Vector_Object_Type: String
      Point_and_Vector_Object_Count: 1513
    SDTS_Terms_Description:
      SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
      Point_and_Vector_Object_Count: 487
Spatial_Reference_Information:
  Horizontal_Coordinate_System_Definition:
    Planar:
      Map_Projection:
        Map_Projection_Name: Polyconic
        Polyconic:
          Latitude_of_Projection_Origin: 33.5
          Latitude_of_True_Scale:             33.5
          Longitude_of_Central_Meridian: -117.1875
          False_Easting: 0.00000
          False_Northing: 0.00000
      Planar_Coordinate_Information:
        Planar_Coordinate_Encoding_Method: coordinate pair
        Coordinate_Representation:
          Abscissa_Resolution: 1.000396370887
          Ordinate_Resolution: 1.000396370887
        Planar_Distance_Units: Meters
    Geodetic_Model:
      Horizontal_Datum_Name: North American Datum of 1927
      Ellipsoid_Name: Clarke 1866
      Semi-major_Axis: 6378206.4
      Denominator_of_Flattening_Ratio: 294.98

Entity_and_Attribute_Information:
  Overview_Description:
    Entity_and_Attribute_Overview:
      Version 1.0 of the Murrieta 7.5' quadrangle comprises three ARC/INFO coverages, of which two contain geologic data, and one contains cartographic features:  mur_geo (geology), mur_str (structural data), and mur_ano (annotation and leaders).

      Geologic data represented by line entities and the polygons they delineate are contained in the coverage MUR_GEO.  For display purposes, the annotation coverage contains two annotation subclasses:  anno.geo contains unit labels and anno.fault contains fault names.
      Geological point data includes site-specific information describing the types and the orientation of bedding, foliation, joints and linear features.  Annotation is respective dip and plunge values associated with individual point data.
      >
      >MUR_GEO.PAT:
      >
      >COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
      >    1  AREA                   8    18     F      5
      >    9  PERIMETER              8    18     F      5
      >   17  MUR_GEO#               4     5     B      -
      >   21  MUR_GEO-ID             4     5     B      -
      >   25  LABL                  35    35     C      -
      >   60  PLABL                 35    35     C      -
      >   95  SHD                    3     3     I      -
      >   98  SHDFIL                 3     3     I      -
      >  101  NAME                 100   100     C      -
      >
      >MUR_GEO.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  MUR_GEO#               4     5     B      -
      >   29  MUR_GEO-ID             4     5     B      -
      >   33  LTYPE                 35    35     C      -
      >   68  L-SYMB                 3     3     I      -
      >
      >
    Entity_and_Attribute_Detail_Citation: None

  Detailed_Description:
    Entity_Type:
      Entity_Type_Label: mur_geo.pat
      Entity_Type_Definition: Geologic units (LABL) and their corresponding names (NAME) identified in the Murrieta 7.5' quadrangle
    Attribute:
      Attribute_Label: LABL
      Attribute_Definition: geologic map unit label, in plain text
      Attribute_Domain_Values:
        Enumerated_Domain:
          Enumerated_Domain_Value: Qyf
          Enumerated_Domain_Value_Definition: Young alluvial fan deposits
        Enumerated_Domain:
          Enumerated_Domain_Value: Qya
          Enumerated_Domain_Value_Definition: Young alluvial channel deposits
        Enumerated_Domain:
          Enumerated_Domain_Value: Qyv
          Enumerated_Domain_Value_Definition: Young alluvial valley deposits
        Enumerated_Domain:
          Enumerated_Domain_Value: Qyls
          Enumerated_Domain_Value_Definition: Young landslide
        Enumerated_Domain:
          Enumerated_Domain_Value: Qoa
          Enumerated_Domain_Value_Definition: Old alluvial channel deposits
        Enumerated_Domain:
          Enumerated_Domain_Value: Qvoa
          Enumerated_Domain_Value_Definition: Very old alluvial channel deposits
        Enumerated_Domain:
          Enumerated_Domain_Value: Qpfs
          Enumerated_Domain_Value_Definition: Pauba Formation, sandstone member
        Enumerated_Domain:
          Enumerated_Domain_Value: Qpff
          Enumerated_Domain_Value_Definition: Pauba Formation, fanglomerate member
        Enumerated_Domain:
          Enumerated_Domain_Value: QTsw
          Enumerated_Domain_Value_Definition: Sandstone and conglomerate of Wildomar area, sandstone unit
        Enumerated_Domain:
          Enumerated_Domain_Value: QTcw
          Enumerated_Domain_Value_Definition: Sandstone and conglomerate of Wildomar area, conglomerate unit
        Enumerated_Domain:
          Enumerated_Domain_Value: Tvsr
          Enumerated_Domain_Value_Definition: Santa Rosa basalt of Mann
        Enumerated_Domain:
          Enumerated_Domain_Value: Tvt
          Enumerated_Domain_Value_Definition: Basalt of Temecula area
        Enumerated_Domain:
          Enumerated_Domain_Value: Tvh
          Enumerated_Domain_Value_Definition: Basalt of Hogbacks
        Enumerated_Domain:
          Enumerated_Domain_Value: Kpvgr
          Enumerated_Domain_Value_Definition: Paloma valley ring complex, granophyre
        Enumerated_Domain:
          Enumerated_Domain_Value: Kpvg
          Enumerated_Domain_Value_Definition: Paloma valley ring complex, monzogranite to granodiorite
        Enumerated_Domain:
          Enumerated_Domain_Value: Kpvt
          Enumerated_Domain_Value_Definition: Paloma valley ring complex, tonalite
        Enumerated_Domain:
          Enumerated_Domain_Value: Kgd
          Enumerated_Domain_Value_Definition: Granodiorite, undifferentiated
        Enumerated_Domain:
          Enumerated_Domain_Value: Kt
          Enumerated_Domain_Value_Definition: Tonalite, undifferentiated
        Enumerated_Domain:
          Enumerated_Domain_Value: Kgb
          Enumerated_Domain_Value_Definition: Gabbro
        Enumerated_Domain:
          Enumerated_Domain_Value: Khg
          Enumerated_Domain_Value_Definition: Heterogeneous granitic rocks
        Enumerated_Domain:
          Enumerated_Domain_Value: Mzu
          Enumerated_Domain_Value_Definition: Metasedimentary rocks, undifferentiated
    Attribute:
      Attribute_Label: PLABL
      Attribute_Definition: Geological map unit label used to generate plot labels with relevant stratigraphic symbols.  The geologic units with LABL designating Mesozoic (Mz) have keystroke substitute characters, }, 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.
    Attribute:
      Attribute_Label: SHD
      Attribute_Definition: polygon color (as integer value) from shadeset alc1.shd
    Attribute:
      Attribute_Label: SHDFIL
      Attribute_Definition: polygon fill pattern (as integer value) from shadeset geology2.shd
    Attribute:
      Attribute_Label: NAME
      Attribute_Definition: Geologic name of map unit (see list under LABL attribute)

  Detailed_Description:
    Entity_Type:
      Entity_Type_Label: mur_geo.aat
      Entity_Type_Definition: Geologic features such as contacts and faults that bound rock-unit polygons
    Attribute:
      Attribute_Label: LTYPE
      Attribute_Definition: Description of types of lines on the geologic map (contact, fault, dike).
      Attribute_Domain_Values:
        Enumerated_Domain:
          Enumerated_Domain_Value: contact, certain
        Enumerated_Domain:
          Enumerated_Domain_Value: fault, certain
        Enumerated_Domain:
          Enumerated_Domain_Value: fault, approx. located
        Enumerated_Domain:
          Enumerated_Domain_Value: fault, concealed
        Enumerated_Domain:
          Enumerated_Domain_Value: Kpvp, pegmatite dike
        Enumerated_Domain:
          Enumerated_Domain_Value: scratch boundary
        Enumerated_Domain:
          Enumerated_Domain_Value: map boundary
  Detailed_Description:
    Entity_Type:
      Entity_Type_Label: mur_str.pat
      Entity_Type_Definition: Geological point data includes site-specific information describing the types and the orientation of bedding, foliation, joints, and lineations.  One annotation subclass is included in the geologic points coverage, MUR_STR which displays the respective dip and plunge values associated with individual point data.
    Attribute:
      Attribute_Label: PTTYPE
      Attribute_Definition: describes type of point data (bedding, foliation, joints, lineations)
      Attribute_Domain_Values:
        Enumerated_Domain:
          Enumerated_Domain_Value: sedimentary bedding
        Enumerated_Domain:
          Enumerated_Domain_Value: vertical sedimentary joint
        Enumerated_Domain:
          Enumerated_Domain_Value: igneous foliation
        Enumerated_Domain:
          Enumerated_Domain_Value: vertical igneous foliation
        Enumerated_Domain:
          Enumerated_Domain_Value: metamorphic foliation
        Enumerated_Domain:
          Enumerated_Domain_Value: dip of fault plane
        Enumerated_Domain:
          Enumerated_Domain_Value: dip of dike
    Attribute:
      Attribute_Label: PT-SYMB
      Attribute_Definition: Coded integer value that relates point to cartographic point symbol in markerset geoscamp2.mrk
    Attribute:
      Attribute_Label: STRIKE
      Attribute_Definition: Azimuthal strike of planar feature
    Attribute:
      Attribute_Label: DIP
      Attribute_Definition: Dip of planar feature
  Detailed_Description:
    Entity_Type:
      Entity_Type_Label: mur_ano.aat
      Entity_Type_Definition: Annotation leaders
    Attribute:
      Attribute_Label: LTYPE
      Attribute_Definition: Describes type of line data(leader)
    Attribute:
      Attribute_Label: L-SYMB
      Attribute_Definition: Coded integer value (1) that relates arcs to cartographic line symbol in lineset, geoscamp2.lin
Distribution_Information:
  Distributor:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: U.S. Geological Survey Information Services
      Contact_Address:
        Address_Type: mailing address
        Address: Box 25286 Denver Federal Center
        City: Denver
        State_or_Province: Colorado
        Postal_Code: 80225
        Country: USA
      Contact_Voice_Telephone: (303)202-4700

      Contact_Facsimile_Telephone: (303)202-4693
  Distribution_Liability:
    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 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 Murrieta 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).

Metadata_Reference_Information:
  Metadata_Date: 20030319
  Metadata_Review_Date: 20030327
  Metadata_Contact:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: U.S. Geological Survey
        Contact_Person: Rachel M. Alvarez
      Contact_Position: Geologist
      Contact_Address:
        Address_Type: mailing address
        Address: U.S. Geological Survey
        Address: Department of Earth Sciences
        Address: University of California, Riverside
        City: Riverside
        State_or_Province: California
        Postal_Code: 92521
        Country: USA
      Contact_Voice_Telephone: (909)276-6397
      Contact_Facsimile_Telephone: (909)276-6295
      Contact_Electronic_Mail_Address: ralvarez@usgs.gov
  Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
  Metadata_Standard_Version: FGDC-STD-001-1998
  Metadata_Access_Constraints: None
  Metadata_Use_Constraints: None