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

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

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://wrgis.wr.usgs.gov/open-file/of00-222>

Online_Linkage: <http://geopubs.wr.usgs.gov/open-file/of00-222>

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 (<http://geology.wr.usgs.gov/wgmt/scamp>), 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: None

Theme_Keyword: Mojave

Theme_Keyword: El Mirage

Theme_Keyword: Geology

Theme_Keyword: geologic map

Theme_Keyword: geologic database

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

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 Mineral Investigations 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

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: 0

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)

Entity_Type_Definition_Source: This Publication

Attribute:

Attribute_Label: FNODE#

Attribute_Definition: ARC/INFO maintained attribute

Attribute_Definition_Source: ARC/INFO

Attribute_Domain_Values:

Unrepresentable_Domain: topologic calculation

Attribute:

Attribute_Label: TNODE#

Attribute_Definition: ARC/INFO maintained attribute

Attribute_Definition_Source: ARC/INFO

Attribute_Domain_Values:

Unrepresentable_Domain: topologic calculation

Attribute:

Attribute_Label: LPOLY#

Attribute_Definition: ARC/INFO maintained attribute

Attribute_Definition_Source: ARC/INFO

Attribute_Domain_Values:

Unrepresentable_Domain: topologic calculation

Attribute:

Attribute_Label: RPOLY#

Attribute_Definition: ARC/INFO maintained attribute

Attribute_Definition_Source: ARC/INFO

Attribute_Domain_Values:

Unrepresentable_Domain: topologic calculation

Attribute:

Attribute_Label: LENGTH

Attribute_Definition: length of the feature

Attribute_Definition_Source: ARC/INFO

Attribute_Domain_Values:

Unrepresentable_Domain: topologic calculation

Attribute:

Attribute_Label: ELM-GEOL#

Attribute_Definition: ARC/INFO maintained attribute

Attribute_Definition_Source: ARC/INFO

Attribute_Domain_Values:

Unrepresentable_Domain: Calculated

Attribute:

Attribute_Label: ELM-GEOL-ID

Attribute_Definition: ARC/INFO maintained attribute

Attribute_Definition_Source: ARC/INFO

Attribute_Domain_Values:

Unrepresentable_Domain: Calculated

Attribute:

Attribute_Label: LTYPE

Attribute_Definition: Description of the type of geologic line

Attribute_Definition_Source: This Publication

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

Enumerated_Domain_Value_Definition_Source: Author

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

Enumerated_Domain_Value_Definition_Source: Author

Enumerated_Domain:

Enumerated_Domain_Value: contact, gradational

Enumerated_Domain_Value_Definition:

Boundary between two mapped units that is transitional over an area.

Enumerated_Domain_Value_Definition_Source: Author

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.

Enumerated_Domain_Value_Definition_Source: Author

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.

Enumerated_Domain_Value_Definition_Source: Author

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.

Enumerated_Domain_Value_Definition_Source: Author

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.

Enumerated_Domain_Value_Definition_Source: Author

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.

Enumerated_Domain_Value_Definition_Source: Author

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

Enumerated_Domain_Value_Definition_Source: Author

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

Enumerated_Domain_Value_Definition_Source: Author

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)

Entity_Type_Definition_Source: This Publication

Attribute:

Attribute_Label: AREA

Attribute_Definition: Area of the feature in map units

Attribute_Definition_Source: ARC/INFO

Attribute_Domain_Values:

Unrepresentable_Domain: topologic calculation

Attribute:

Attribute_Label: PERIMETER

Attribute_Definition: Perimeter of the feature in map units

Attribute_Definition_Source: ARC/INFO

Attribute_Domain_Values:

Unrepresentable_Domain: topologic calculation

Attribute:

Attribute_Label: ELM-GEOL#

Attribute_Definition: ARC/INFO maintained attribute

Attribute_Definition_Source: ARC/INFO

Attribute_Domain_Values:

Unrepresentable_Domain: Calculated

Attribute:

Attribute_Label: ELM-GEOL-ID

Attribute_Definition: ARC/INFO maintained attribute

Attribute_Definition_Source: ARC/INFO

Attribute_Domain_Values:

Unrepresentable_Domain: Calculated

Attribute:

Attribute_Label: PTYPE

Attribute_Definition: Geologic unit attribute

Attribute_Definition_Source: This Publication

Attribute_Domain_Values:

Unrepresentable_Domain:

Geologic map unit labels are described in the accompanying geologic report, or in the 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_Definition_Source: This Publication

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)

Entity_Type_Definition_Source: This Publication

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)

Entity_Type_Definition_Source: This Publication

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)

Entity_Type_Definition_Source: This Publication

Detailed_Description:

Entity_Type:

Entity_Type_Label: elm-kar.pat

Entity_Type_Definition:

Point Features in the coverage 'elm-kar' (locations of dated samples)

Entity_Type_Definition_Source: This Publication

Detailed_Description:

Entity_Type:

Entity_Type_Label: elm-srcs

Entity_Type_Definition: An index of previous mapping

Entity_Type_Definition_Source: This Publication

Detailed_Description:

Entity_Type:

Entity_Type_Label: elm-strat

Entity_Type_Definition: Mapping strategies used by the authors of this report

Entity_Type_Definition_Source: This Publication

Detailed_Description:

Entity_Type:

Entity_Type_Label: elm-topo

Entity_Type_Definition: Vector representation of a topographic map for the mapped area

Entity_Type_Definition_Source: This Publication

Detailed_Description:

Entity_Type:

Entity_Type_Label: elm-obs

Entity_Type_Definition:

Point Features in the coverage 'elm-obs' (locations of field observations)

Entity_Type_Definition_Source: This Publication

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:

All files for this report can be accessed via the World Wide Web at: <http://wrgis.wr.usgs.gov/open-file/of00-222> or through File Transfer Protocol (FTP) at <ftp://wrgis.wr.usgs.gov/pub/open-file/of00-222/>

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: no compression applied

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: <http://geopubs.wr.usgs.gov/open-file/of00-222/>

Network_Resource_Name: <ftp://geopubs.wr.usgs.gov/pub/open-file/of00-222/>

Fees: None

Custom_Order_Process:

Database files, PostScript plotfiles, and related files can be obtained by sending a tape or CDR (Recordable CD-ROM) with request and return address to:

El Mirage Lake, California Database c/o Database Coordinator U.S. Geological Survey 345 Middlefield Road, M/S 975 Menlo Park, CA 94025

Do not omit any part of this address!

The compressed tar file will be returned on the tape or CD-ROM. The acceptable tape type is: 2.3 or 5.0 GB, 8 mm Exabyte tape.

Metadata_Reference_Information:

Metadata_Date: 20000323

Metadata_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

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