Geologic Map Database of the El Mirage Lake Area, San Bernardino and Los Angeles Counties, California

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Miller, David M.
Originator: Bedford, David R.
Publication_Date: 2000
Title:
Geologic Map Database of the El Mirage Lake Area, San Bernardino and Los Angeles Counties, California
Edition: 1.0
Geospatial_Data_Presentation_Form: vector digital data
Series_Information:
Series_Name: U.S. Geological Survey Open-File Report
Issue_Identification: 00-222
Publication_Information:
Publication_Place: Menlo Park, CA
Publisher: U.S. Geological Survey
Online_Linkage: http://pubs.usgs.gov/of/2000/0222/
Description:
Abstract:
This geologic map database for the El Mirage Lake area describes geologic materials for the dry lake, parts of the adjacent Shadow Mountains and Adobe Mountain, and much of the piedmont extending south from the lake upward toward the San Gabriel Mountains. This area lies within the western Mojave Desert of San Bernardino and Los Angeles Counties, southern California. The area is traversed by a few paved highways that service the community of El Mirage, and by numerous dirt roads that lead to outlying properties. An off-highway vehicle area established by the Bureau of Land Management encompasses the dry lake and much of the land north and east of the lake. The physiography of the area consists of the dry lake, flanking mud and sand flats and alluvial piedmonts, and a few sharp craggy mountains.
This digital geologic map database, intended for use at 1:24,000- scale, describes and portrays the rock units and surficial deposits of the El Mirage Lake area. It was prepared as part of a water-resource assessments of the area, describing and interpreting surface geology that provides information to help understand distribution and extent of deeper groundwater-bearing units. The area mapped covers the Shadow Mountains SE and parts of the Shadow Mountains, Adobe Mountain, and El Mirage 7.5-minute quadrangles. The map database includes detailed geology of surface and bedrock deposits, which represent a significant update from previous bedrock geologic maps by Dibblee (1960) and Troxel and Gunderson (1970), and the surficial geologic map of Ponti and Burke (1980); it incorporates a fringe of the detailed bedrock mapping in the Shadow Mountains by Martin (1992).
Purpose:
This digital geologic map database, intended for use at 1:24,000- scale, describes and portrays the rock units and surficial deposits of the El Mirage Lake area. It was prepared as part of a water-resource assessments of the area, describing and interpreting surface geology that provides information to help understand distribution and extent of deeper groundwater-bearing units. Map data were assembled as a digital database using ARC/ INFO to enable wider applications than traditional paper-product geologic maps and to provide for efficient integration with other digital data bases prepared by the U.S. Geological Survey's Southern California Areal Mapping Project, other federal and state agencies, and the Mojave Water Agency.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1999
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -117.690702
East_Bounding_Coordinate: -117.501459
North_Bounding_Coordinate: 34.735409
South_Bounding_Coordinate: 34.499069
Keywords:
Theme:
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: geology
Theme_Keyword: geologic maps
Theme_Keyword: bedrock geologic units
Theme_Keyword: surficial geologic units
Theme_Keyword: geospatial datasets
Theme:
Theme_Keyword_Thesaurus: none
Theme_Keyword: Mojave
Theme_Keyword: El Mirage
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Categories
Theme_Keyword: geoscientificInformation
Place:
Place_Keyword_Thesaurus: none
Place_Keyword: Mojave Desert
Place_Keyword: San Bernardino County
Place_Keyword: Los Angeles County
Place_Keyword: Southern California
Place_Keyword: El Mirage
Place_Keyword: Nash Hill
Place_Keyword: Shadow Mountains
Place_Keyword: Adobe Mountain
Place:
Place_Keyword_Thesaurus: Augmented FIPS 10-4 and FIPS 6-4
Place_Keyword: f06037 = Los Angeles
Place_Keyword: f06071 = San Bernardino
Access_Constraints: None
Use_Constraints:
Acknowledgement of the U.S. Geological Survey, Southern California Areal Mapping Project, Mojave Water Agency, and California Division of Mines and Geology would be appreciated in products derived from this dataset
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
MS 975
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
Browse_Graphic:
Browse_Graphic_File_Name: elm_browse.jpg
Browse_Graphic_File_Description: Thumbnail
Browse_Graphic_File_Type: JPEG
Data_Set_Credit: U.S. Geological Survey
Native_Data_Set_Environment:
Windows NT Version 4.0 (Build 1381) Service Pack 5; ESRI ArcInfo 8.0.297
Data_Quality_Information:
Logical_Consistency_Report:
Polygon and chain-node topology present. Geologic lines attributed as a 'contact' do not separate geologic map units of the same type.
Completeness_Report:
This report is intended to completely describe the surficial and bedrock materials of the map area at a scale of 1:24000.
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 two kinds of less certainly located features, each distinguished in the database: 1) contacts and faults located with an accuracy of 10 to 15 m, 2) contacts that represent gradational boundaries between adjacent units. Gradational contacts represent interleaving of sediments and smooth gradations in characteristics such as percentage of eolian sand. In general, these gradations take place over distances of 50 to 150 m. Lineaments and fold axes are lines whose positions do not affect location of polygons; they are located with an accuracy of 25 m.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: Dibble, T.W.
Publication_Date: 1960
Title:
Preliminary geologic map of the Shadow Mountains quadrangle, Los Angeles and San Bernardino Counties, California
Series_Information:
Series_Name: U.S. Geological Survey Miscellaneous Field Studies Map
Issue_Identification: MF-227
Source_Scale_Denominator: 62500
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1960
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Dibblee (1960)
Source_Contribution:
Distinguished a few surficial geologic units, four granitoid units, and several metamorphic rock units. Mapped the most evident faults, as well as folds in metamorphic rocks.
Source_Information:
Source_Citation:
Citation_Information:
Originator:
Troxel, B.W. Gunderson, J.N.
Publication_Date: 1970
Title:
Geology of the Shadow Mountains and northern part of the Shadow Mountains SE quadrangles, western San Bernardino County, California
Series_Information:
Series_Name: California Division of Mines and Geology Preliminary Report
Issue_Identification: 12
Source_Scale_Denominator: 24000
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1970
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Troxel and Gunderson (1970)
Source_Contribution:
Distinguished a few surficial geologic units, a few granitoid units, and several metamorphic rock units. Mapped granitoid and metamorphic rock units in detail, as well as faults and folds in metamorphic rocks. Mapped lineaments and faults in pediments.
Source_Information:
Source_Citation:
Citation_Information:
Originator:
Ponti, D.J. Burke, D.B
Publication_Date: 1980
Title:
Map showing Quaternary geology of the eastern Antelope Valley and vicinity, California
Series_Information:
Series_Name: U.S. Geological Survey Open-File Report
Issue_Identification: OFR80-1064
Source_Scale_Denominator: 62500
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1980
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Ponti and Burke (1980)
Source_Contribution:
Mapped a wide range of surficial geology with a focus on areas with active faulting. Mapped several previously unrecognized faults in the El Mirage Lake area but did not break out many surficial geology units in this area.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Martin, M.W.
Publication_Date: 1992
Title:
Stratigraphic and structural evolution of the Shadow Mountains, western Mojave Desert, California: Implications for the tectonic development of the central and western Mojave Desert
Other_Citation_Details: Unpublished Ph.D. dissertation, University of Kansas, 196 p
Source_Scale_Denominator: 12000
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1992
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Martin (1992)
Source_Contribution:
Conducted very detailed (1:12,000) mapping of bedrock in Shadow Mountains but none in pediments. Distinguished several map units in metamorphic rocks and deduced sedimentary, metamorphic, and structural history.
Process_Step:
Process_Description: ARC/INFO version 7.2.1, 8.0.1, ArcView version 3.1
Process_Date: 1999
Process_Step:
Process_Description: Creation of original metadata record
Process_Date: 20000323
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: David R. Bedford
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical address
Address:
345 Middlefield Rd
MS 975
City: Menlo Park
State_or_Province: CA
Postal_Code: 94025
Country: USA
Contact_Voice_Telephone: 650-329-4924
Contact_Facsimile_Telephone: 650-329-4936
Contact_Electronic_Mail_Address: dbedford@usgs.gov
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Complete chain
Point_and_Vector_Object_Count: 2651
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Entity point
Point_and_Vector_Object_Count: 955
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
Point_and_Vector_Object_Count: 955
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Point
Point_and_Vector_Object_Count: 49
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: 0.9996
Longitude_of_Central_Meridian: 117.0
Latitude_of_Projection_Origin: 0.0
False_Easting: 500000
False_Northing: 0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.000016
Ordinate_Resolution: 0.000016
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
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: elm-geol.aat
Entity_Type_Definition:
Arc attributes for coverage 'elm-geol' (Faults, depositional contacts, and rock units)
Attribute:
Attribute_Label: LTYPE
Attribute_Definition: Description of the type of geologic line
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: contact, approx. located
Enumerated_Domain_Value_Definition:
Boundary between two mapped units that has been observed but the location is not precise
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: contact, certain
Enumerated_Domain_Value_Definition:
Boundary between two mapped units that was observed, the location of which is well known and is described in Positional_Accuracy
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: contact, gradational
Enumerated_Domain_Value_Definition:
Boundary between two mapped units that is transitional over an area.
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: fault, approx. located
Enumerated_Domain_Value_Definition:
Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced relative offset. Locational accuracy is approximate, and described in Positional_Accuracy.
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: fault, approx. located, queried
Enumerated_Domain_Value_Definition:
Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced relative offset. The existence is inferred from structural, stratographic, of lineament relations. Locational accuracy is approximate, and described in Positional_Accuracy.
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: fault, certain
Enumerated_Domain_Value_Definition:
Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced relative offset. Locational accuracy is well located, and described in Positional_Accuracy.
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: fault, concealed
Enumerated_Domain_Value_Definition:
Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced relative offset. The fault is obscured by overlying map units, so it is not well-located as described in Positional_Accuracy, but is constrained to within about 120 meters on the ground.
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: fault, concealed, queried
Enumerated_Domain_Value_Definition:
Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced relative offset. The fault is obscured by overlying map units, so it is not well-located as described in Positional_Accuracy, but is constrained to within about 150 meters on the ground. Existence of the fault is inferred from lineaments or structural relations elsewhere.
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: map boundary, certain
Enumerated_Domain_Value_Definition:
Edge of mapped area, used to bound polygons at the edge of the map database. Locational confidence is described in Positional_Accuracy
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: scratch boundary
Enumerated_Domain_Value_Definition:
An arbitrary line usually with no geologic significance, but sometimes used to divide polygons with the same rock type, but divided by a separate attribute
Detailed_Description:
Entity_Type:
Entity_Type_Label: elm-geol.pat
Entity_Type_Definition:
Polygon attributes for coverage 'elm-geol' (Faults, depositional contacts, and rock units)
Attribute:
Attribute_Label: PTYPE
Attribute_Definition:
Geologic map unit labels are typically short sequences of letters, in which the first letter, which is commonly capitalizzed, indicates the geologic period in which the unit was formed. The correspondence between these labels and the descriptions of the units themselves is specified in the accompanying geologic report and on the printed map sheet.
Attribute:
Attribute_Label: ITEMID
Attribute_Definition:
Provides a common field to which other tabular data (ELM-GEOL.PID) can be used in a relational database
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1
Range_Domain_Maximum: 967
Detailed_Description:
Entity_Type:
Entity_Type_Label: elm-str.aat
Entity_Type_Definition:
Arc features in coverage 'elm-str' (Geologic structure layer - strike and dips, fold axis, etc)
Detailed_Description:
Entity_Type:
Entity_Type_Label: elm-str.pat
Entity_Type_Definition:
Point features in coverage 'elm-str' (Geologic structure layer - strike and dips, fold axis, etc)
Detailed_Description:
Entity_Type:
Entity_Type_Label: elm-spr.pat
Entity_Type_Definition:
Point Features in the coverage 'elm-spr' (Location of spring mound deposits)
Detailed_Description:
Entity_Type:
Entity_Type_Label: elm-kar.pat
Entity_Type_Definition:
Point Features in the coverage 'elm-kar' (locations of dated samples)
Detailed_Description:
Entity_Type:
Entity_Type_Label: elm-srcs
Entity_Type_Definition: An index of previous mapping
Detailed_Description:
Entity_Type:
Entity_Type_Label: elm-strat
Entity_Type_Definition: Mapping strategies used by the authors of this report
Detailed_Description:
Entity_Type:
Entity_Type_Label: elm-topo
Entity_Type_Definition: Vector representation of a topographic map for the mapped area
Detailed_Description:
Entity_Type:
Entity_Type_Label: elm-obs
Entity_Type_Definition:
Point Features in the coverage 'elm-obs' (locations of field observations)
Overview_Description:
Entity_and_Attribute_Overview:
This database consists of eight ARC/INFO format data sets (coverages), each of which is considered a layer comprising a geologic map. These layers are: a geology layer (elm-geol), a geologic structure layer (elm-str), locations of spring mounds (elm-spr), locations of dated samples (elm-kar), areas of previous mapping (elm-srcs), areas of mapping strategies (elm-strat), locations of field observations (elm-obs), and a vector representation of a topographic map (elm-topo).
Entity_and_Attribute_Detail_Citation: This Publication
Overview_Description:
Entity_and_Attribute_Overview:
The primary layer is the geology layer (elm-geol), which consists of both polygon features and arc features that describes map units (polygons), and depositional contacts, faults (which may or may not be polygon bounding features) and map boundaries.
Map units (polygons) are described in the polygon attribute table (elm-geol.pat). The identities of the map units are recorded in the PTYPE field by map label (i.e. Qvof). For a description of the map units, consult the PostScript or PDF explanation pamphlets in this report. Areal features in the geology layer (ELM-GEOL) that require attributes other than a map unit, are given unique identification numbers in the ITEMID field. ITEMID provides a common field to which other tabular data (ELM-GEOL.PID) can be used in a relational database.
Geologic lines (arcs) are recorded as strings of vectors and are described in the arc attribute table (elm-geol.aat). They define the boundaries of the map units, the faults, and the map boundaries. These distinctions, including the geologic identities of the unit boundaries, are recorded in the LTYPE field. Attributes for geologic lines generally follow a scheme of the type of geologic line (i.e. fault), followed by a locational and/or scientific modifier (i.e. approx. located or queried).
Entity_and_Attribute_Detail_Citation: This Publication
Overview_Description:
Entity_and_Attribute_Overview:
The geologic structure layer (elm-str) consists of arc and point features that describe geologic structures such as strike and dip of beds, and fold axis. Arc features are described in the arc attribute table (elm-str.aat), and in this report only describe linear representations of fold axis and lineaments interpreted from air photography. The type of linear structural feature is distinguished in the LTYPE field. Point features are described in the point attribute table (elm-str.pat) and are used to represent locations of structural measurements such as strike and dip, and foliation. The type of structural measurement of points is attributed in the PTTYPE field, and the measurements taken at that location are attributed in the STRIKE and DIP fields.
Entity_and_Attribute_Detail_Citation: This Publication
Overview_Description:
Entity_and_Attribute_Overview:
Point features representing location of spring mound deposits (elm-spr) are described in the point attribute table (elm-spr.pat). Attributes of features in this dataset are recorded in the PTTYPE field.
Entity_and_Attribute_Detail_Citation: This Publication
Overview_Description:
Entity_and_Attribute_Overview:
Point features representing location of Potassium/Argon (K/Ar) dated samples (elm-kar) are described in the point attribute table (elm-kar.pat). Attributes of features in this dataset are recorded in the PTTYPE field.
Entity_and_Attribute_Detail_Citation: This Publication
Overview_Description:
Entity_and_Attribute_Overview:
An index of previous mapping (ELM-SRCS) consists of four ARC/INFO regions: PREVMAP1, PREVMAP2, PREVMAP3, and PREVMAP4. ARC/INFO regions allow polygonal information to be stored in a way that areas, or regions, can be overlapping, or non-contiguous in nature. Attribute information for regions is stored in tables that have the name of the coverage Polygon Attribute Table (PAT), followed by the name of a region (i.e. elm-srcs.patprevmap1). Regions may have different table definitions (items) than the base Polygon Attribute Table, and regions within the same coverage may have different table definitions (items). Each region has identical table definitions, consisting of the following items: AUTHORS, YEAR, TITLE, PUBLICATION, and SCALE. The Polygon Attribute Table (ELM-SRCS.PAT) has no attributes with the exception of the default ARC/INFO attributes. For complete bibliographic references, see appendix 1 in the geologic discussion of this report.
Entity_and_Attribute_Detail_Citation: This Publication
Overview_Description:
Entity_and_Attribute_Overview:
Mapping strategies used by the authors of this report (ELM-STRAT) are represented as polygons. The mapping strategies are described in the Polygon Attribute Table (ELM-STRAT.PAT) for this coverage. The mapping strategies are described in the following items: FIELDID, GEOLOGIST, and METHODS.
Entity_and_Attribute_Detail_Citation: This Publication
Overview_Description:
Entity_and_Attribute_Overview:
Point features representing location of field observations made by the authors of this report. Attributes of features in this dataset are recorded in the PTTYPE field in the point attribute table (elm-obs.pat). There is only one attribute in this field: Field Observation
Entity_and_Attribute_Detail_Citation: This Publication
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: El Mirage Lake California Database
Contact_Position: Database coordinator
Contact_Address:
Address_Type: mailing address
Address: 345 Middlefield Road, MS 975
City: Menlo Park
State_or_Province: CA
Postal_Code: 94025
Country: USA
Contact_Voice_Telephone: (650) 329-2923
Resource_Description: USGS Open-File Report 00-222
Distribution_Liability:
This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards or with the North American Stratigraphic Code. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
This database, identified as "Geologic Map Database of the El Mirage Lake Area, San Bernardino and Los Angeles Counties, California," has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review.
Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ARCE
Format_Version_Number: 8.0
Format_Information_Content:
ARC/INFO export files, explanatory materials, and printable maps for the digital database can be downloaded at the specified URL
File_Decompression_Technique: gzip -d and tar
Transfer_Size: 13
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Fees: none
Metadata_Reference_Information:
Metadata_Date: 20160613
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Peter N Schweitzer
Contact_Organization: USGS Midwest Area
Contact_Position:
Collection manager, USGS Geoscience Data Clearinghouse, http://geo-nsdi.er.usgs.gov/
Contact_Address:
Address_Type: mailing address
Address:
Mail Stop 954
12201 Sunrise Valley Dr
City: Reston
State_or_Province: VA
Postal_Code: 20192-0002
Country: USA
Contact_Voice_Telephone: 703-648-6533
Contact_Facsimile_Telephone: 703-648-6252
Contact_Electronic_Mail_Address: pschweitzer@usgs.gov
Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time

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