Identification_Information:
  Citation:
    Citation_Information:
      Originator: Kyle House, U.S. Geological Survey, Geologist
      Publication_Date: 2018
      Title: Geologic Map of the Castle Rock 7.5’ Quadrangle, Arizona and California
      Edition: 1.0
      Geospatial_Data_Presentation_Form: vector digital data
      Series_Information:
        Series_Name: U.S. Geological Survey Scientific Investigations Map
        Issue_Identification: 3411
      Publication_Information:
        Publication_Place: Reston, Virginia
        Publisher: U.S. Geological Survey
      Online_Linkage: https://doi.org/10.3133/sim3411
  Description:
    Abstract: This digital map database represents the general distribution of bedrock and surficial geologic units, and related data in the Castle Rock 7.5’ quadrangle, Arizona and California. The database delineates map units that are identified by general age and lithology following the stratigraphic nomenclature of the U.S. Geological Survey.This metadata report provides an overview of the data content of this ESRI ArcGIS 10.3 file geodatabase and associated files. Refer to the Supplemental Information section of this metadata report for more information about the contents of the geodatabase and associated files. Refer to the feature class-level metadata reports for detailed attribute information. Refer to the accompanying map and pamphlet for cartographic, descriptive, and interpretive presentations of the information.
    Purpose: The Castle Rock quadrangle contains key structural and stratigraphic elements recording a complex history of Cretaceous plutonism and deformation, significant tectonic extension, volcanism, and sedimentation in the Miocene, and, ultimately, the evolution of the Colorado River from the latest Miocene to the present. The Castle Rock quadrangle is in the northeastern corner of Chemehuevi Valley, California and Arizona. It includes the Colorado River’s entrance to the valley at the mouth of Topock Gorge and the northern outskirts of Lake Havasu City, Arizona, and the Chemehuevi Indian Tribal community of Havasu Lake, California. The map includes large parts of the Chemehuevi Indian Reservation and the Havasu National Wildlife Refuge. Upon its exit through the mouth of Topock Gorge, the Colorado River enters Chemehuevi Valley where its floodplain (now submerged under Lake Havasu) is flanked by alluvial piedmonts of the Chemehuevi and Mohave Mountains to the west and east, respectively. This abrupt transition offers a useful perspective into the structural evolution of the Colorado River extensional corridor and of the Colorado River itself. Lake Havasu submerged the axis of Chemehuevi Valley following the completion of Parker Dam in 1938, and the Colorado River now feeds a verdant delta marsh that comprises part of the map. Important bedrock units include the Cretaceous Chemehuevi Mountain Plutonic Suite, the 18.78 Ma Peach Spring Tuff, and thick overlying sequences of interlayered Miocene megabreccia and fanglomerate. The exposure of these units is closely linked to extension along the Chemehuevi-Whipple Mountain detachment fault system. The complex bedrock geologic framework serves as the structural and topographic foundation for the key strata chronicling the evolution of the lower Colorado River. Important stratigraphic units that bear on its evolution to the present day include the Bouse Formation, the Bullhead Alluvium, the Chemehuevi Formation, and the modern delta. This database and the accompanying map and pamphlet are products of ongoing geologic mapping efforts in the lower Colorado River corridor (LOCO), led by the U.S. Geological Survey (USGS) and the Arizona Geological Survey (AZGS). The study is funded through the USGS National Cooperative Geologic Mapping Program, and is focused on the identification and characterization of Colorado River deposits in the area between Hoover and Imperial Dams, in Nevada, California, and Arizona.
    Supplemental_Information:
      The schema for this geodatabase is derived, in part, from the NCGMP09--draft standard format for digital publication of geologic maps, version 1.1 (NCGMP09 v1.1), available at http://ngmdb.usgs.gov/Info/standards/NCGMP09/. Feature attributes and symbology follow the recommendations outlined in the FGDC Digital Cartographic Standard for Geologic Map Symbolization, available at https://pubs.usgs.gov/tm/2006/11A02/..

      CastleRock24k_USGS_SIM-3411.gdb contains the following spatial and non-spatial data:

      GeologicMap (feature dataset) - contains the following feature classes used to depict the geology:
      CartographicLines - annotation leaders for MapUnitPointsAnno24k (domain CR24k_FGDC_CartoLines attached to Type field)
      ContactsAndFaults - geologic contacts and faults (domain CR24k_FGDC_ContactsFaults attached to Type field)
      DataSourcePolys - boundaries of published maps used in bedrock compilation
      GenericSamples - microfossil and geochronology sample locations
      GenericSamplesAnno - annotation for GenericSamples
      GeomorphLines - lineaments (domain CR24k_FGDC_GeomorphLines attached to Type field)
      MapUnitPoints - geologic map unit label points (domain CR24k_MapUnits attached to MapUnit field)
      MapUnitPointsAnno24k - feature-linked annotation for MapUnitPoints via relationship class Anno_218_393
      MapUnitPolys - geologic map unit polygons (domain CR24k_MapUnits attached to MapUnit field)
      OrientationPoints - Orientation data for planar and linear geologic features (domain CR24k_FGDC_OrientationPts attached to Type field)
      OrientationPointsAnno24k - feature-linked annotation for OrientationPoints via relationship class Anno_217_395

      CorrelationOfMapUnits (feature dataset) - includes the following feature classes used to depict the Correlation of Map Units, List of Map Units, and Explanation of Map Symbols for the geologic map:
      CMUAnno - geologic unit names, ages, and other descriptive text
      CMULines - age brackets and line symbols in Explanation of Map Symbols (domain CR24k_CMULines attached to Type field)
      CMUMapUnitPolys - boxes depicting List of Map Units and Correlation of Map Units (domain CR24k_MapUnits attached to MapUnit field)
      CMUPoints - point symbols in Explanation of Map Symbols (domain CR24k_FGDC_OrientationPts attached to Type field)

      DataSources (non-spatial table) - contains references to data sources used to the compile data in the CastleRock24k_USGS_SIM-3411 geodatabase.

      DescriptionOfMapUnits (non-spatial table) - tabular representation of the content of the Description of Map Units (contained in the accompanying pamphlet), and the List of Map Units, and Correlation of Map Units (portrayed on the accompanying geologic map).

      Resources (folder) - contains CastleRock24k_USGS_SIM-3411.style and associated fonts (used to symbolize line and point features by matching values in Type field to style, and to symbolize MapUnitPolys by matching values in MapUnit field to style); o34114e3.tif and o34114e4.tif (1:24,000-scale DRG topo bases, UTM11_NAD27), and other acillary data used to create the map graphic.
  Status:
    Progress: Complete
    Maintenance_and_Update_Frequency: None planned
  Spatial_Domain:
    Bounding_Coordinates:
      West_Bounding_Coordinate: -114.903522
      East_Bounding_Coordinate: -114.02606
      North_Bounding_Coordinate: 35.981392
      South_Bounding_Coordinate: 33.089819
  Keywords:
    Theme:
      Theme_Keyword_Thesaurus: None
      Theme_Keyword: geologic map
    Theme:
      Theme_Keyword_Thesaurus: ISO 19115 Topic Categories
      Theme_Keyword: geoscientificInformation
    Place:
      Place_Keyword_Thesaurus: None
      Place_Keyword: Colorado River, Chemehuevi Mountains, Mohave Mountains, Topock Gorge, Lake Havasu, Havasu National Wildlife Refuge, Chemehuevi Indian Reservation, Clark County, Mohave County, San Bernardino County, Arizona, California
  Access_Constraints: None
  Use_Constraints: Not for use at scales larger than 1:24,000. Any derivative products utilizing these datasets shall clearly indicate their source. If users modify the data in any way, they are obligated to describe the types of modifications they have performed. User specifically agrees not to misrepresent these datasets, nor to imply that changes they made were approved by the USGS.
  Point_of_Contact:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: U.S. Geological Survey
        Contact_Person: Kyle House
      Contact_Position: Geologist
      Contact_Address:
        Address_Type: unknown
        Address: 2255 N. Gemini Dr.
        City: Flagstaff
        State_or_Province: AZ
        Postal_Code: 86001
      Contact_Voice_Telephone: 928-556-7179
      Contact_Facsimile_Telephone: 928-556-7169
      Contact_Electronic_Mail_Address: khouse@usgs.gov
      Contact_Instructions: Please contact through email
  Data_Set_Credit: This digital database was prepared by Kyle House, Sue Beard, Debra Block, Colleen Cassidy, Ryan Crow, Tracey Felger, and Beth Mennow (all USGS). Technical reviews were provided by Keith Howard (USGS) and Phil Pearthree (AZGS). Digital review was provided by Stephanie Dudash (USGS).
Data_Quality_Information:
  Attribute_Accuracy:
    Attribute_Accuracy_Report: Geologic features in the geodatabase were symbolized based on attributes, plotted at 1:24,000-scale and visually reviewed for accuracy by the authors.
  Logical_Consistency_Report: Geologic lines (ContactsAndFaults), and geologic units (MapUnitPolys) are topologically related entities. The following topology rules were employed to maintain the topological integrity of the data: geologic lines 1) must not self-overlap, 2) must not self-intersect, 3) must not have pseudonodes, 4) must not intersect or touch interior, 5) must be single part, and 6) must not have dangles [excepting faults]; geologic units 1) must not overlap, 2) must not have gaps, and 3) boundary must be covered by [geologic lines].
  Completeness_Report: This geodatabase is considered complete for the time period of the content. The quadrangle is completely mapped, and all geologic features on the source maps were digitized and attributed, as was all new mapping.
  Positional_Accuracy:
    Horizontal_Positional_Accuracy:
      Horizontal_Positional_Accuracy_Report: Bedrock geology for this database was digitized from georeferenced 1:24,000-scale source maps, and new mapping of surficial geology was compiled at scales from 1:12,000 to 1:24,000. Lines in feature class ContactsAndFaults with the modifier 'location accurate' in the Type field (e.g. Contact - Identity and existence certain, location accurate) are assumed (but not guaranteed) to be located within approximately +/- 15 meters of their actual position on the ground. Lines with modifiers 'approximate', inferred', and 'concealed' are assumed to be poorly located, and may have errors that greatly exceed +/- 15 meters. Points in feature class OrientationPoints that were digitized from georeferenced 1:24,000-scale source maps are assumed (but not guaranteed) to be located within approximately +/- 15 meters of their actual position on the ground, while points that were collected as part of this study were located using a handheld GPS, and are assumed to be located within approximately +/- 5 to 10 meters of their position on the ground. Points in feature classes MapUnitPoints are used in conjunction with the lines in ContactsAndFaults to create MapUnitPolys, and for cartographic annotation; the locations have only a very general geographic relevance. Similarly, all the feature classes in the CorrelationOfMapUnits feature dataset are for cartographic purposes only; the locations have no geographic relevance.
Spatial_Data_Organization_Information:
  Direct_Spatial_Reference_Method: Vector
Distribution_Information:
  Distributor:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: U.S. Geological Survey
        Contact_Person: U.S. Geological Survey Information Services
      Contact_Address:
        Address_Type: unknown
        Address: Box 25286 Denver Federal Center
        City: Denver
        State_or_Province: Colorado
        Postal_Code: 80225
        Country: US
      Contact_Voice_Telephone: 1-888-ASK-USGS
      Contact_Electronic_Mail_Address: ask@usgs.gov
  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 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 delivery, installation, operation, or support by USGS.
  Standard_Order_Process:
    Fees: None
Metadata_Reference_Information:
  Metadata_Contact:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: U.S. Geological Survey
        Contact_Person: Tracey Felger
      Contact_Position: Geologist
      Contact_Address:
        Address_Type: unknown
        Address: 2255 N. Gemini Dr.
        City: Flagstaff
        State_or_Province: AZ
        Postal_Code: 86001
        Country: US
      Contact_Voice_Telephone: 928-556-7348
      Contact_Facsimile_Telephone: 928-556-7169
      Contact_Electronic_Mail_Address: tfelger@usgs.gov
      Contact_Instructions: Please contact through email
  Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
  Metadata_Standard_Version: FGDC-STD-001-1998
  Metadata_Time_Convention: local time