Identification_Information: Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: 2014 Title: Generalized Surficial Geologic Map of the Fort Irwin Area, San Bernardino County, California Geospatial_Data_Presentation_Form: vector digital data Other_Citation_Details: Open-File Report 2013-1024–B Online_Linkage: http://pubs.usgs.gov/of/2013/1024/b/ Description: Abstract: The geology and landscape of the Fort Irwin area, typical of many parts of the Mojave Desert, consist of rugged mountains separated by broad alluviated valleys that form the main coarse-resolution features of the geologic map. Crystalline and sedimentary rocks, Paleozoic and older in age, form most of the mountains with local accumulations of Miocene sedimentary and volcanic rocks. In detail, the area exhibits a fairly complex distribution of surficial geology resulting from diverse rock sources and geomorphology that has been driven by topographic changes caused by recent and active faulting. Depositional environments span those typical of the Mojave Desert: alluvial fans on broad piedmonts, major intermittent streams along valley floors, eolian sand dunes and sheets, and playas in closed valleys that lack through-going washes. Erosional environments include rocky mountains, smooth gently-sloping pediments, and badlands in readily eroded sediment. All parts of the landscape, from regional distribution of mountains, valleys, and faults to details of degree of soil development in surface materials, are portrayed by the surficial geologic map. Many of these attributes govern infiltration and recharge, and the surface distribution of permeable rock units such as Miocene sedimentary and volcanic rocks provides a basis for evaluating potential groundwater storage. Quaternary faults are widespread in the Fort Irwin area and include sinistral, east-striking faults that characterize the central swath of the area, and the contrasting dextral, northwest-striking faults that border the east and west margins. Bedrock distribution and thickness of valley-fill deposits are controlled by modern and past faulting, and faults on the map help to identify targets for groundwater exploration. Purpose: A compilation of intermediate scale surficial maps and geologic databases of the Fort Irwin area produced to aid in understanding the (1) ground-water availability, and (2) natural hazard risks. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2013 Currentness_Reference: publication date Status: Progress: Complete Maintenance_and_Update_Frequency: As needed Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -117.18 East_Bounding_Coordinate: -116.11 North_Bounding_Coordinate: 35.70 South_Bounding_Coordinate: 35.02 Keywords: Theme: Theme_Keyword_Thesaurus: This Report Theme_Keyword: Surficial Geology Place: Place_Keyword_Thesaurus: This Report Place_Keyword: Fort Irwin, California Access_Constraints: None Use_Constraints: Acknowledgement of the U.S. Geological Survey; uses of this digital geologic map 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. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: David M. Miller Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 345 Middlefield Rd. MS973 City: Menlo Park State_or_Province: CA Postal_Code: 94025 Country: USA Contact_Voice_Telephone: 650-329-4923 Contact_Facsimile_Telephone: 650-329-4936 Contact_Electronic_Mail_Address: dmiller@usgs.gov Native_Data_Set_Environment: Microsoft Windows 2000 Version 5.2 (Build 3790) Service Pack 2; ESRI ArcCatalog 10.1 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: faults are attributed with labels according to locational accuracy. Logical_Consistency_Report: All geologic polygons are attributed with map unit designators found in the Description of Map Units Completeness_Report: Complete for Publication Standards Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Accuracy of line locations is carried in the database and displayed by different line symbols (solid vs. dashed lines) in the cartographic display. For the purpose of this database, solid lines represent contacts and faults located with an accuracy greater than 10 m and commonly greater than 5 m. Dashed lines represent less certainly located features distinguished in the database and located with an accuracy of 10 to 15 m. Contacts that represent gradational boundaries between adjacent units. Gradational contacts represent interleaving of sediments and gradations in characteristics that take place over distances of 50 to 150 m. Lineage: Process_Step: Process_Description: Metadata imported. Source_Used_Citation_Abbreviation: C:\DOCUME~1\dmiller\LOCALS~1\Temp\xml2D.tmp Process_Date: 20120830 Process_Time: 17563800 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 11 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.999600 Longitude_of_Central_Meridian: -117.000000 Latitude_of_Projection_Origin: 0.000000 False_Easting: 500000.000000 False_Northing: 0.000000 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.000100 Ordinate_Resolution: 0.000100 Planar_Distance_Units: meters Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1983 Ellipsoid_Name: Geodetic Reference System 80 Semi-major_Axis: 6378137.000000 Denominator_of_Flattening_Ratio: 298.257222 Vertical_Coordinate_System_Definition: Altitude_System_Definition: Altitude_Resolution: 0.000100 Altitude_Encoding_Method: Explicit elevation coordinate included with horizontal coordinates Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: fault Distribution_Information: Resource_Description: Downloadable Data Metadata_Reference_Information: Metadata_Date: 20120830 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: David M. Miller Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 345 Middlefield Rd. MS 973 City: Menlo Park State_or_Province: CA Postal_Code: 94025 Country: USA Contact_Voice_Telephone: 650-329-4923 Contact_Facsimile_Telephone: 650-329-4963 Contact_Electronic_Mail_Address: dmiller@usgs.gov Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Time_Convention: local time Metadata_Extensions: Online_Linkage: http://www.esri.com/metadata/esriprof80.html Profile_Name: ESRI Metadata Profile Metadata_Extensions: Online_Linkage: http://www.esri.com/metadata/esriprof80.html Profile_Name: ESRI Metadata Profile