Identification_Information:

  Citation:
    Citation_Information:
      Originator: Douglas M. Morton and Jon C. Matti
      Publication_Date: 2004
      Title: Preliminary Geologic Map of the Hemet 7.5' Quadrangle, Riverside County, California
      Edition: Version 1.1
      Geospatial_Data_Presentation_Form: vector digital data
      Series_Information:
        Series_Name: U.S. Geological Survey Open-File Report
        Issue_Identification: USGS OFR 04-1455
      Publication_Information:
        Publication_Place: Menlo Park, California
        Publisher: U.S. Geological Survey
      Online_Linkage: http://pubs.usgs.gov/of/2004/1455
  Description:

    Abstract:
      The Hemet 7.5' quadrangle is located near the eastern edge of the Perris block (Woodford and others, 1971) of the Peninsular Ranges batholith.  The northeastern corner of the quadrangle extends across the San Jacinto Fault Zone onto the edge of the San Jacinto Mountains block.  The Perris block is a relatively stable area located between the Elsinore Fault Zone on the west and the San Jacinto Fault Zone on the east.  Both of the fault zones are active; the San Jacinto being the seismically most active in southern California.  The fault zone is obscured by very young alluvial deposits.  The concealed location of the San Jacinto Fault Zone shown on this quadrangle is after Sharp, 1967.
      The geology of the quadrangle is dominated by Cretaceous tonalite formerly included in the Coahuila Valley pluton of Sharp (1967).  The northern part of Sharp's Coahuila Valley (his Kt5) pluton is separated out as the Hemet pluton.  Tonalite of the Hemet pluton is more heterogeneous than the tonalite of the Coahuila Valley pluton and has a different sturctural pattern.  The Coahuila Valley pluton consists of relatively homogeneous hornblende-biotite tonalite, commonly with readily visible large euhedral honey-colored sphene crystals.  Only the tip of the adjacent Tucalota Valley pluton, another large tonalite pluton, extends into the quadrangle. Tonalite of the Tucalota Valley pluton is very similar to the tonalite of the Coahuila Valley pluton except it generally lacks readily visible sphene.
      In the western part of the quadrangle a variety of amphibolite grade metasedimentary rocks are informally referred to as the rocks of Menifee Valley; named for exposures around Menifee Valley west of the Hemet quadrangle.  In the southwestern corner of the quadrangle a mixture of schist and gneiss marks a suture that separated low metamorphic grade metasedimentary rocks to the west from high metamorphic grade rocks to the east. The age of these rocks is interpreted to be Triassic (Morton, 2004) and the age of the suturing is about 100 Ma (Premo, and others, 1998),  essentially the same age as the adjacent Coahuila Valley pluton (Sharp, 1967).  Rocks within the suture zone consist of a mixture of lithologies from both sides of the suture.  Gneiss, schist, and anatectic gneiss are the predominate lithologies within the rocks on the east side of the suture.  Lesser amounts of metalithic greywacke and  lenticular masses of black amphibolite are subordinate rock types.  Biotite, biotite-sillimanite and lesser amounts of garnet-biotite-sillimanite schist and metaquartzite-metalithic greywacke lithologies occur west of the suture.
      Pleistocene continental beds, termed the Bautista beds (e.g., Sharp, 1967) occur east of the San Jacinto Fault Zone in the northeast corner of the quadrangle.  Most of the Bautista beds were derived from the San Jacinto pluton that is located just to the east of the sedimentary rocks.  Along the northern part of the quadrangle is the southern part of a large Holocene-late Pleistocene fan emanating from Baustista Canyon.  Sediments in the Bautista fan are characterized by their content of detritus derived from amphibolite grade metasedimentary rocks located in the Bautista Canyon drainage.  Between the Holocene-late Pleistocene Bautista fan and the Santa Rosa Hills is the remnant of a much older Bautista Canyon alluvial fan.  A pronounced Holocene-late Pleistocene channel was developed along the south fringe of the very old alluvial fan and the Santa Rosa Hill.   A now dissected late to middle Pleistocene alluvial complex was produced by the coalesced fans of Goodhart, St. Johns, and Avery canyons, and Cactus Valley.
Pleistocene continental beds, termed the Bautista beds (e.g., Sharp, 1967) occur east of the San Jacinto Fault Zone in the northeast corner of the quadrangle.  Most of the Bautista beds were derived from the San Jacinto pluton that is located just to the east of the sedimentary rocks.  Along the northern part of the quadrangle is the southern part of a large Holocene-late Pleistocene fan emanating from Baustista Canyon.  Sediments in the Bautista fan are characterized by their content of detritus derived from amphibolite grade metasedimentary rocks located in the Bautista Canyon drainage.  Between the Holocene-late Pleistocene Bautista fan and the Santa Rosa Hills is the remnant of a much older Bautista Canyon alluvial fan.  A pronounced Holocene-late Pleistocene channel was developed along the south fringe of the very old alluvial fan and the Santa Rosa Hill.   A now dissected late to middle Pleistocene alluvial complex was produced by the coalesced fans of Goodhart, St. Johns, and Avery canyons, and Cactus Valley.
Time_Period_of_Content:
  Time_Period_Information:
    Single_Date/Time:
      Calendar_Date: 2004
  Currentness_Reference: New data

Status:
  Progress: Complete
  Maintenance_and_Update_Frequency: As Needed

Spatial_Domain:
  Bounding_Coordinates:
    West_Bounding_Coordinate: -117.00009053
    East_Bounding_Coordinate: -116.87490947
    North_Bounding_Coordinate: 33.74999995
    South_Bounding_Coordinate: 33.62498421

Keywords:
  Theme:
    Theme_Keyword_Thesaurus: None
    Theme_Keyword: geologic map
    Theme_Keyword: geology
    Theme_Keyword: bedrock geology
  Place:
    Place_Keyword_Thesaurus: None
    Place_Keyword: California
    Place_Keyword: Riverside County
    Place_Keyword: Hemet quadrangle

  Stratum:
    Stratum_Keyword_Thesaurus: None
    Stratum_Keyword: gneiss
    Stratum_Keyword: schist
    Stratum_Keyword: graywacke
    Stratum_Keyword: quartzite
    Stratum_Keyword: amphibolite
    Stratum_Keyword: granitic rocks
    Stratum_Keyword: tonalite
    Stratum_Keyword: granodiorite
    Stratum_Keyword: alluvial fan
Access_Constraints: None

Use_Constraints:
  The Hemet 7.5' geologic-map database should be used to evaluate and understand the geologic character of the Hemet 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: 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: United States of America
    Contact_Voice_Telephone: (951) 276-6397
    Contact_Facsimile_Telephone: (951) 276-6295
    Contact_Electronic_Mail_Address: scamp@usgs.gov

Data_Set_Credit: Geologic mapping and digital preparation of this report were sponsored by (1) the Southern California Areal Mapping Project (SCAMP) and (2) the California Geological Survey.
Native_Data_Set_Environment:
  SunOS, 5.8, sun4m UNIX
  ARC/INFO version 8.2

Data_Quality_Information:
  Attribute_Accuracy:
    Attribute_Accuracy_Report:
      Geologic-map units in the Hemet 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 Hemet 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 (D.M. Morton and J.C. Matti).
      Process_Date: 1999-2003

    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 (J.N. Lesser and K.R. Bovard).
      Process_Date: 2003-2004

    Process_Step:
      Process_Description: Description of map units and correlation of map units (K.R. Bovard and F.K. Miller).
      Process_Date: 2004
    Process_Step:
      Process_Description: First draft of metadata created by kbovard using FGDCMETA.AML ver. 1.2 05/14/98 on ARC/INFO data set /scamp31/kbovard/hmt1_geo
      Process_Date: 20041116
    Process_Step:
      Process_Description: Corrected minor data omission.  One polygon added and annotation updated.
      Process_Date: 20080214
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: 167
      SDTS_Point_and_Vector_Object_Type: String
      Point_and_Vector_Object_Count: 435
      SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
      Point_and_Vector_Object_Count: 168

Spatial_Reference_Information:
  Horizontal_Coordinate_System_Definition:
    Planar:
      Map_Projection:
        Map_Projection_Name: Polyconic
        Polyconic:
          Longitude_of_Central_Meridian: -116.9375
          Latitude_of_Projection_Origin: 33.625
          False_Easting: 0.00000
          False_Northing: 0.00000
      Planar_Coordinate_Information:
        Planar_Coordinate_Encoding_Method: coordinate pair
        Coordinate_Representation:
          Abscissa_Resolution: 0.0027666187379
          Ordinate_Resolution: 0.0027666187379
        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 1.1 of the Hemet 7.5' quadrangle comprises three ARC/INFO coverages, of which two contain geologic data, and one contains cartographic features:  hmt1_geo (geology), hmt1_str (structural data), and hmt1_ano (annotation and leaders).
      Geologic data represented by line entities and the polygons they delineate are contained in the coverage HMT1_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 foliation, joints and lineations.  Annotation is respective dip and plunge values associated with individual point data.
    Entity_and_Attribute_Detail_Citation: none

  Detailed_Description:
    Entity_Type:
      Entity_Type_Label: hmt1_geo.pat
      Entity_Type_Definition: Geologic units (LABL) and their corresponding names (NAME) identified in the Hemet 7.5' quadrangle
    Attribute:
      Attribute_Label: LABL
      Attribute_Definition: geologic map unit label, in plain text
      Attribute_Domain_Values:
        Enumerated_Domain:
          Enumerated_Domain_Value: Qw
          Enumerated_Domain_Value_Definition: Wash deposits
        Enumerated_Domain:
          Enumerated_Domain_Value: Qls
          Enumerated_Domain_Value_Definition: Landslide deposits undivided
        Enumerated_Domain:
          Enumerated_Domain_Value: Qyf
          Enumerated_Domain_Value_Definition: Young alluvial fan deposits
        Enumerated_Domain:
          Enumerated_Domain_Value: Qyf1
          Enumerated_Domain_Value_Definition: Young alluvial fan deposits, Unit 1
        Enumerated_Domain:
          Enumerated_Domain_Value: Qyfb
          Enumerated_Domain_Value_Definition: Young alluvial fan deposits of Bautista Canyon
        Enumerated_Domain:
          Enumerated_Domain_Value: Qyfb1
          Enumerated_Domain_Value_Definition: Young alluvial fan deposits of Bautista Canyon, Unit 1
        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: Qof
          Enumerated_Domain_Value_Definition: Old alluvial fan deposits
        Enumerated_Domain:
          Enumerated_Domain_Value: Qof1
          Enumerated_Domain_Value_Definition: Old alluvial fan deposits, Unit 1
        Enumerated_Domain:
          Enumerated_Domain_Value: Qoa
          Enumerated_Domain_Value_Definition: Old axial channel deposits
        Enumerated_Domain:
          Enumerated_Domain_Value: Qoc
          Enumerated_Domain_Value_Definition: Old colluvial deposits
        Enumerated_Domain:
          Enumerated_Domain_Value: Qvof
          Enumerated_Domain_Value_Definition: Very old alluvial fan deposits
        Enumerated_Domain:
          Enumerated_Domain_Value: Qbb
          Enumerated_Domain_Value_Definition: Bautista beds
        Enumerated_Domain:
          Enumerated_Domain_Value: Ktv
          Enumerated_Domain_Value_Definition: Tonalite of the Tucalota Valley pluton
        Enumerated_Domain:
          Enumerated_Domain_Value: Kcv
          Enumerated_Domain_Value_Definition: Tonalite of the Coahuila Valley pluton of Sharp 1967
        Enumerated_Domain:
          Enumerated_Domain_Value: Kh
          Enumerated_Domain_Value_Definition: Hemet pluton
        Enumerated_Domain:
          Enumerated_Domain_Value: Kgd
          Enumerated_Domain_Value_Definition: Granodiorite of the Peninsular Ranges batholith
        Enumerated_Domain:
          Enumerated_Domain_Value: Kt
          Enumerated_Domain_Value_Definition: Tonalite of the Peninsular Ranges batholith
        Enumerated_Domain:
          Enumerated_Domain_Value: Kd
          Enumerated_Domain_Value_Definition: Dioritic rock of the Peninsular Ranges batholith
        Enumerated_Domain:
          Enumerated_Domain_Value: Khg
          Enumerated_Domain_Value_Definition: Heterogeneous granitic rocks of the Peninsular Ranges batholith
        Enumerated_Domain:
          Enumerated_Domain_Value: KgMz
          Enumerated_Domain_Value_Definition: Intermixed Mesozoic schist and Cretaceous granitic rocks
        Enumerated_Domain:
          Enumerated_Domain_Value: Tra
          Enumerated_Domain_Value_Definition: Amphibolite
        Enumerated_Domain:
          Enumerated_Domain_Value: Trg
          Enumerated_Domain_Value_Definition: Graywacke
        Enumerated_Domain:
          Enumerated_Domain_Value: Trqg
          Enumerated_Domain_Value_Definition: Intermixed quartzite and graywacke
        Enumerated_Domain:
          Enumerated_Domain_Value: Trs
          Enumerated_Domain_Value_Definition: Schist
        Enumerated_Domain:
          Enumerated_Domain_Value: Trgn
          Enumerated_Domain_Value_Definition: Biotite gneiss and schist
        Enumerated_Domain:
          Enumerated_Domain_Value: Trsgn
          Enumerated_Domain_Value_Definition: Mixed low metamorphic grade and upper amphibolite grade rocks
        Enumerated_Domain:
          Enumerated_Domain_Value: Pzsg
          Enumerated_Domain_Value_Definition: Schist and gneiss
    Attribute:
      Attribute_Label: PLABL
      Attribute_Definition: geologic map unit label, in coded text, used for plotting special characters contained in the geofont.txt textset (the geofont.txt textset must be used for these characters to be displayed correctly)
    Attribute:
      Attribute_Label: SHD
      Attribute_Definition: Coded integer value that relates units to cartographic shades in shadeset wpgcmykg.shd
    Attribute:
      Attribute_Label: SHDFIL
      Attribute_Definition: Coded integer value that relates units to cartographic patterns in shadeset geoscamp2.shd
  Detailed_Description:
    Entity_Type:
      Entity_Type_Label: hmt1_geo.aat
      Entity_Type_Definition: Line types (LTYPE), and numbers corresponding to line symbols (L-SYMB) used for plotting contacts, faults, etc. identified in the Hemet 7.5' quadrangle
    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: contact, approx. located
        Enumerated_Domain:
          Enumerated_Domain_Value: fault, concealed
        Enumerated_Domain:
          Enumerated_Domain_Value: scratch boundary
        Enumerated_Domain:
          Enumerated_Domain_Value: map boundary
    Attribute:
      Attribute_Label: L-SYMB
      Attribute_Definition: Coded integer value that relates line to cartographic line symbol in lineset geoscamp2.lin
  Detailed_Description:
    Entity_Type:
      Entity_Type_Label: hmt1_str.pat
      Entity_Type_Definition: Geological point data includes site-specific information describing the types and the orientation of foliation, joints, and lineations.
    Attribute:
      Attribute_Label: PTTYPE
      Attribute_Definition: describes type of point data (foliation, joints, lineations)
      Attribute_Domain_Values:
        Enumerated_Domain:
          Enumerated_Domain_Value: igneous foliation
        Enumerated_Domain:
          Enumerated_Domain_Value: igneous foliation, approx
        Enumerated_Domain:
          Enumerated_Domain_Value: vertical igneous foliation
        Enumerated_Domain:
          Enumerated_Domain_Value: vertical igneous foliation, approx
        Enumerated_Domain:
          Enumerated_Domain_Value: metamorphic foliation
        Enumerated_Domain:
          Enumerated_Domain_Value: vertical metamorphic foliation
        Enumerated_Domain:
          Enumerated_Domain_Value: metamorphic lineation
        Enumerated_Domain:
          Enumerated_Domain_Value: minor metamorphic fold axis
    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: hmt1_ano.aat
      Entity_Type_Definition: annotation leaders
    Attribute:
      Attribute_Label: LTYPE
      Attribute_Definition: Description of type of line in the annotation coverage
      Attribute_Domain_Values:
        Enumerated_Domain:
          Enumerated_Domain_Value: 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 Hemet 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: 20041116
  Metadata_Review_Date: 2041122
  Metadata_Contact:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: U.S. Geological Survey
        Contact_Person: Kelly R. Bovard
      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: (951) 276-6397
      Contact_Facsimile_Telephone: (951) 276-6295
      Contact_Electronic_Mail_Address: kbovard@usgs.gov
  Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
  Metadata_Standard_Version: Version of June 8, 1994
  Metadata_Access_Constraints: none
  Metadata_Use_Constraints: none