This data set maps and describes the geology of the San Bernardino Wash 7.5 minute
quadrangle, Riverside County, southern California. The quadrangle, situated in
Joshua Tree National Park in the eastern Transverse Ranges physiographic and
structural province, encompasses parts of the northwestern Eagle Mountains,
east-central Pinto Basin, and eastern Pinto Mountains.
The quadrangle is underlain by a basement terrane comprising metamorphosed
Proterozoic strata, Mesozoic plutonic rocks, and Jurassic and Mesozoic and (or)
Cenozoic hypabyssal dikes. The basement terrane is capped by a widespread Tertiary
erosion surface preserved in remnants in the Pinto and Eagle Mountains and buried
beneath Cenozoic deposits in Pinto Basin. Locally, a cover of Miocene sedimentary
deposits and basalt overlie the erosion surface. A sequence of at least three
Quaternary pediments is planed into the north piedmont of the Eagle Mountains, each
in turn overlain by successively younger residual and alluvial, surficial deposits.
The Tertiary erosion surface is deformed and broken by north-northwest-trending,
high-angle, dip-slip faults in the Pinto and Eagle Mountains and an east-west
trending system of high-angle dip- and left-slip faults along the range fronts
facing Pinto Basin. In and around the San Bernardino Wash quadrangle, faults of
the north-northwest-trending set displace Miocene sedimentary rocks and basalt
deposited on the Tertiary erosion surface and some of the faults may offset
Pliocene and (or) Pleistocene deposits that accumulated on the oldest pediment.
Faults of this system appear to be overlain by Pleistocene deposits that
accumulated on younger pediments. East-west trending faults are younger than and
perhaps in part coeval with faults of the northwest-trending set.
The San Bernardino Wash database was created using ARCVIEW and ARC/INFO, which are
geographical information system (GIS) software products of Envronmental Systems
Research Institute (ESRI). The database comprises five coverages: (1) a geologic
layer showing the distribution of geologic contacts and units; (2) a structural
layer showing the distribution of faults (arcs) and fault ornamentation data
(points); (3) a layer showing the distribution of dikes (arcs); a structural point
data layer showing (4) bedding and metamorphic foliation attitudes, and (5)
cartographic map elements, including unit label leaders and geologic unit
annotation. The dataset also includes a scanned topographic base at a scale of
1:24,000. Within the database coverages, geologic contacts , faults, and dikes are
represented as lines (arcs and routes), geologic units as areas (polygons and
regions), and site-specific data as points. Polygon, region, arc, route, and point
attribute tables uniquely identify each geologic datum and link it to descriptive
tables that provide more detailed geologic information.
The digital database is accompanied by two derivative maps: (1) A portable document
file (.pdf) containing a navigable graphic of the geologic map on a 1:24,000
topographic base and (2) a PostScript graphic-file containing the geologic map on a
1:24,000 topographic base. Each of these map products is accompanied by a marginal
explanation consisting of a Description of Map Units (DMU), a Correlation of Map
Units (CMU), and a key to point and line symbols. The database is further
accompanied by three document files: (1) a readme that lists the contents of the
database and describes how to access it, (2) a pamphlet file that describes the
geology of the quadrangle and (3) this metadata file.
Purpose:
The data set for the San Bernardino Wash quadrangle has been prepared by the
Southern California Areal Mapping Project (SCAMP), a cooperative project sponsored
jointly by the U.S. Geological Survey and the California Geological Survey. The San
Bernardino Wash data set represents part of an ongoing effort to create a regional
GIS geologic database for southern California. This regional digital database, in
turn, is being developed as a contribution to the National Geologic Map Database of
the National Cooperative Geologic Mapping Program of the USGS. The San Bernardino
Wash database has been prepared in cooperation with the National Park Service as
part of an ongoing project to provide Joshua Tree National Park with a geologic map
base for use in managing Park resources and developing interpretive materials.
The digital geologic map database for the San Bernardino Wash quadrangle has been
created as a general-purpose data set that is applicable to land-related
investigations in the earth and biological sciences. Along with geologic map
databases in preparation for adjoining quadrangles, the San Bernardino Wash
database has been generated to further our understanding of bedrock and surficial
processes at work in the region and to document evidence for seismotectonic
activity in the eastern Transverse Ranges. The database is designed to serve as a
base layer suitable for ecosystem and mineral resource assessment and for building
a hydrogeologic framework for the Pinto Basin.
Supplemental_Information:
Map nomenclature and symbols
Within the geologic map database, map units are identified by standard geologic map
criteria such as formation-name, age, and lithology. The authors have attempted to
adhere to the stratigraphic nomenclature of the U.S. Geological Survey and the
North American Stratigraphic Code, but the database has not received a formal
editorial review of geologic names.
Geologic map unit labels are present in three forms in the database. First, map
unit labels are entered into the database through various items in the polygon
attribute table, dike arc attribute table, and region attribute tables. Geologic
map units are tabulated in items such as UNIT_LABEL and POLY_LABEL, where they are
identified by plain-text unit labels (e.g., Qyamg1, Prpqp). These labels do not
show subscript offsets and do not contain conventional stratigraphic age symbols,
i.e., Proterozoic appears as 'Pr'. Second, for the purpose of plotting the map,
the item PLOT_LABEL, located in the polygon attribute and map display tables,
identifies the unit label as it is plotted by Arc/Info (e.g., Qyamg1, <pqp), again
without subscripts and containing substitute characters for conventional
stratigraphic age symbols: Proterozoic appears as '<'. The substitute character in
PLOT_LABEL invokes its corresponding symbol from the GeoAge font group to generate
map plots that display conventional stratigraphic symbols. Third, annotation labels
for map units, derived from the item PLOT_LABEL but showing subscripts (e.g.,
Qyamg1), are stored in the annotation subclass anno.geo of the arc coverage
sbwash_carto/.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1964
Ending_Date: 2002
Currentness_Reference: Data collection period
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As Needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -115.7500914
East_Bounding_Coordinate: -115.6249086
North_Bounding_Coordinate: 33.99999995
South_Bounding_Coordinate: 33.87498418
Keywords:
Theme:
Theme_Keyword_Thesaurus: none
Theme_Keyword: geologic map
Theme_Keyword: geology
Theme_Keyword: surficial geology
Theme_Keyword: bedrock geology
Theme_Keyword: fault
Theme_Keyword: erosion surface
Theme_Keyword: pediment
Theme_Keyword: soil
Theme_Keyword: alluvial deposits
Theme_Keyword: dike
Theme_Keyword: batholith
Theme_Keyword: metamorphic rocks
Theme_Keyword: plutonic rocks
Theme_Keyword: hypabyssal rocks
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Categories
Theme_Keyword: geoscientificInformation
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: southern California
Place_Keyword: Riverside County
Place_Keyword: Joshua Tree National Park
Place_Keyword: eastern Transverse Ranges
Place_Keyword: San Bernardino Wash
Place_Keyword: Eagle Mountains
Place_Keyword: Pinto Mountains
Place_Keyword: Pinto Basin
Place_Keyword: San Bernardino Wash 7.5' quadrangle
Place_Keyword: Pinto Basin 15' quadrangle
Place_Keyword: Eagle Mountains 30' x 60' quadrangle
Place:
Place_Keyword_Thesaurus: Augmented FIPS 10-4 and FIPS 6-4, version 1.0
Place_Keyword: 06065 = Riverside
Stratum:
Stratum_Keyword_Thesaurus: None
Stratum_Keyword: Basalt
Stratum_Keyword:
Porphyritic quartz monzonite, monzogranite, and granodiorite of San Bernardino Wash
Stratum_Keyword: Quartzite of Pinto Mountain
Stratum_Keyword: Dolomite of Iron Chief mine
Stratum_Keyword: Alluvium
Access_Constraints: None
Use_Constraints:
Spatial Resolution. Use of this digital geologic map should not violate the
spatial resolution of the data. The San Bernardino Wash geologic map and database
was developed using digital orthophotograph quarter quadrangles (DOQQs) as a base.
DOQQs have a pixel resolution of 1 m and are accurate to a scale of 1:12,000 (1 in
= 1,000 ft). Any enlargement beyond 1:12,000 exceeds the spatial resolution of the
geologic data and should not be used in lieu of a more detailed site-specific
geologic evaluation. Similarly, the digital topographic base map is derived from
the U.S. Geological Survey, 1:24,000-scale San Bernardino Wash 7.5 minute
quadrangle (provisional edition, 1986); any enlargement beyond 1:24,000 exceeds the
spatial resolution of the topographic data. Plotting or viewing of the data at
scales larger than 1:12,000 on the DOQQ base, or larger than 1:24,000 on the
topographic base, will not yield greater real detail, although it may reveal
fine-scale irregularities below the intended resolution of the database. Where the
geologic data is used in combination with the topographic data, the resolution of
the combined output is limited by the lower resolution of the topographic data.
Where this database is used in combination with other data of higher resolution,
the resolution of the combined output will be limited by the lower resolution of
these data.
Content. This database, identified as "Geologic map and digital database of the
San Bernardino Wash 7.5 minute quadrangle, Riverside County, California" has been
approved for release and publication by the Director of the U.S. Geological
Survey. 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 the condition that
neither the USGS nor the United States Government may be held responsible for any
damages resulting from its authorized or unauthorized use. This database 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.
Faults. The San Bernardino Wash database is sufficiently detailed to identify and
characterize many actual and potential geologic hazards represented by faults, but
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, for example, Hart, 1988; Hart
and Bryant, 1997).
Hart, E. W., 1988, Fault-rupture zones in California; Alquist-Priolo Special
Studies Zones Act of 1972 with index to special studies zones maps (revised, 1988):
California Division of Mines and Geology Special Publication 42.
Hart, E. W., and Bryant, W.A., 1997, Fault-rupture zones in California;
Alquist-Priolo Special Studies Zones Act of 1972 with index to special studies
zones maps (revised, 1997): California Division of Mines and Geology Special
Publication 42.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Robert E. Powell
Contact_Organization:
U.S.Geological Survey, Western Region, Earth Surface Processes Team
Contact_Position: Project geologist
Contact_Address:
Address_Type: mailing address
Address:
U.S. Geological Survey
Room 202
West 904 Riverside Avenue
Browse_Graphic_File_Description: Printable representation of the map sheet, 11.2 megabytes.
Browse_Graphic_File_Type: PDF
Data_Set_Credit:
The digital data set was prepared by Pamela Cossette.
Geologic mapping, topical studies, and digital preparation for this report were
sponsored jointly by the following: (1) the National Cooperative Geologic Mapping
Program of the U.S. Geological Survey, (2) California Geological Survey, and (3)
the National Park Service (Joshua Tree National Park).
This database was prepared in the GIS laboratory at the Spokane Field Office of the
USGS in Spokane, Washington. The facility is maintained primarily by the Mineral
Resource Surveys Program and supported in part by the National Geologic Mapping
Program.
Technical review by Fred K. Miller has led to significant improvements in the
database and in the map plot file. Digital review by Scott Graham has allowed us
to further improve the digital database.
Native_Data_Set_Environment: SunOS, 5.8, sun4u UNIX ARC/INFO version 8.1
Cross_Reference:
Citation_Information:
Originator: Robert E. Powell
Publication_Date: 2002
Title:
Geologic map and digital database of the Pinto Mountain 7.5
minute quadrangle, Riverside County, California
Geospatial_Data_Presentation_Form: map
Series_Information:
Series_Name: U.S. Geological Survey Open-File Report
This initial version of the San Bernardino Wash geologic map database relies
extensively on interpretation of aerial photographs; field study of bedrock units
was conducted in the context of smaller-scale regional mapping and field study of
surficial deposits has been minimal. The map represents the state of knowledge for
the quadrangle and provides a basis for gathering additional field data to resolve
questions raised in making the map. Attributes assigned to regions, polygons,
lines, and points in the San Bernardino Wash database are reasonably accurate as
determined by the normal range of checks and balances applied in making a geologic
map by a combination of hands-on and remote field observation, sampling, and
interpretation of aerial photographs. Additional field investigation, however, is
required to verify the accuracy of polygon (map unit) attributes and to establish
relations among units. Where anomalous descriptive characteristics lead to
particular uncertainty of unit assignment of a polygon, the polygon is included
within the region feature subclass IDENT, where it is assigned a value of
"questionable" in the item UNIT_IDENT. In the San Bernardino Wash quadrangle, this
attribution has been used chiefly for unit assignments of unvisited polygons that
appear anomalous on aerial photographs.
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 and digital database of the San Bernardino Wash 7.5 minute
quadrangle contain 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:
Geologic lines are considered to be accurately located if the linear geologic
features that they represent are discrete, well exposed, and the horizontal
location of the line representing the feature is judged to lie within limits
defined by national map accuracy standard. These standards are 1/50 in or +/-40 ft
(12 m) for features located on 1:24,000 scale topographic maps and 1/30 in or
+/-33.3 ft (10 m) for features located on 1:12,000 scale digital orthophotograph
quarter quadrangles (DOQQs). Linear features are considered discrete if they are
sharply defined with a width less than or equal to 1/100 in at scale of map (20 ft
for features located on 1:24,000 scale topographic maps and 10 ft for features
located on 1:12,000 scale DOQQs).
Geologic lines that are not discrete (e.g., gradational or transitional contacts),
are not well exposed, or cannot be located within the limits defined by the
national map accuracy standard are considered to be approximately located. Linear
features in the San Bernardino geologic map database are represented as solid,
dashed, and dotted lines. Using a DOQQ base, linear features represented by solid
lines are located to within 33.3 ft (10 m) or less of their position on the ground.
Linear features represented as dashed or dotted lines may or may not be located to
within 10 m of their position on the ground. Linear features represented by dotted
lines are concealed beneath overlying mapped units.
The accuracy of point features in the San Bernardino Wash database is +/-10 ft for
points located on the DOQQ base, +/-33 ft for points located on a 1:24,000-scale
topographic base, and +/-52 ft for points located on a 1:62,000-scale topographic
base. Contacts between lithologic domains that make up surficial deposits as
mapped on the DOQQs typically are readily located to within 10 m, but to make
domains that can be resolved at 1:24,000 contacts are often drawn by approximating
the dominant unit on a percentage basis. Interspersal of well- and approximately
located segments is common among the many thousands of contacts present in the San
Bernardino Wash quadrangle. Given that many quadrangles are being mapped in a
relatively short time interval, it was deemed too time-consuming to distinguish
well-located and approximately located contacts between surficial deposits;
therefore, all surficial contacts are represented as approximately located and
shown with a dashed line symbol.
Lineage:
Process_Step:
Process_Description:
Geologic mapping for Ph.D. dissertation (Powell, 1981), supported in part by U.S.
Geological Survey Earthquake Hazards Program, and in part by the National Science
Foundation grants (EAR 76-23153 and EAR-74-00155) awarded to Leon T. Silver at the
California Institute of Technolgy. Bedrock units and faults mapped in field on
1:36,000 true-color aerial photographs (USGS, 1973), compiled onto a 1:62,500
topographic base map of the Pinto Basin 15' quadrangle (1963, paper copy), then
reduced onto a 125,000 topographic base (base-stable mylar greenline). Bedrock
units in the Pinto Basin quadrangle were mapped, described, and interpreted by
conducting field traverses and interpolating between the traverses by
interpretation of aerial photographs. This mapping was part of a regional study of
the geology and structure of the eastern Transverse Ranges province south of the
Pinto Mountain fault.
Powell, R.E., 1981, Geology of the crystalline basement complex,
eastern Transverse Ranges, southern California: Constraints on
regional tectonic interpretation [Ph.D. thesis]: Pasadena,
California Institute of Technology, 441 p.
USGS, 1973, True color aerial photographs labeled GS-SE. Photographs
taken along northwest-southeast oriented flight lines covering the
eastern Transverse Ranges south of the PInto Mountain fault. Lines
flown at moderate to low sun-angle in October 1973; scale 1:36,000.
Process_Date: 1973 to 1981
Process_Step:
Process_Description:
Additional observations were made in bedrock units of the Pinto Basin quadrangle
during the course of ongoing geologic studies in the eastern Transverse Ranges
province (Powell, 1993).
Powell, R.E., 1993, Balanced palinspastic reconstruction of pre-late Cenozoic
paleogeology, southern California: Geologic and kinematic constraints on evolution of
the San Andreas fault system, in Powell, R.E., Weldon, R.J., II, and Matti, J.C.,
eds., The San Andreas fault system: Displacement, palinspastic reconstruction, and
geologic evolution: Geological Society of America Memoir 178, p. 1-106.
Process_Date: 1982 to 1995
Process_Step:
Process_Description:
The geologic map and database for the San Bernardino Wash quadrangle was generated
by combining the bedrock mapping of previous process-steps with new, larger-scale
mapping both of bedrock units and surficial deposits. The new mapping is based
chiefly on interpretation of 1:24,000 color photographs (USGS, 1998), 1:40,000 NAPP
infrared color photographs (USGS, 1996), and 1:80,000 NHAP infrared color
photographs (USGS, 1983-1984) with minimal new fieldwork at this stage. Using
ARCVIEW and its Image Analysis extension, geologic contacts, faults, and dikes were
mapped on georeferenced USGS digital orthophotograph quarter quadrangles (DOQQs).
The lines generated in ARCVIEW were assigned basic attributes and exported to
ARCINFO where a line-polygon coverage was generated for the geology layer. This
coverage was exported back to ARCVIEW as line and polygon shape files. Polygons
were assigned their basic attributes in ARCVIEW and re-exported to ARCINFO for more
complete attribution in the full coverage. Polygons in the coverage are attributed
to generate the plot-file map. These plot-file map units, as well as other mapped
units and aggregates of units that are included in the database but not shown on
the plot-file map, are further attributed as region features (groups of polygons).
Polygons were aggregated into regions to facilitate the identification, description
and subsequent display of either individual rock units or stratigraphic groups of
units at various hierarchical levels. Arcs representing fault segments were
transferred to a separate coverage and aggregated into routes.
USGS, 1998, True color aerial photographs labeled J.T.N.P. Photographs taken along
east-west oriented flight lines covering part of Joshua Tree National Park in Pinto
Basin and parts of the Coxcomb, Pinto, Eagle, Cottonwood, Hexie, and Little San
Bernardino Mountains. Lines flown at high sun-angle in May 1998; scale 1:24,000.
Process_Date: 1997-2001
Process_Step:
Process_Description:
The source of the base hypsography, hydrography, and culture for the geologic map is
the U.S. Geological Survey, 1:24,000-scale topographic map of the San Bernardino Wash
7.5 minute quadangle (provisional edition, 1986). The topographic map was
photographically reproduced on scale-stable clear film. The resulting blackline
photo-positive image was scanned at 500 dpi using an Anatech Eagle 4080 monochrome
800 dpi rasterizing scanner. The raster scan was imported into ARC/INFO, registered
and rectified to the San Bernardino Wash quadrangle, and saved in GEOTIFF format.
Topographic elements on the base map are geospatially located by this process, but no
features are attributed. The topographic base map is provided for locational
reference only.
Process_Date: 2000
Process_Step:
Process_Description:
To provide a topographic base for the geologic map, the monochromatic raster scan
file and the geologic map coverages were converted to ARC/INFO grids, and merged,
resulting in the topographic and cultural information drawn in gray and the geologic
map unit colors drawn with their respective colors. The combined map is a digital
image in which geologic and topographic lines and points are displayed in their
proper geospatial locations, but for which no information other than location is
attached to the lines and points.
Process_Date: 2002
Process_Step:
Process_Description:
Locations of foliation and bedding measurements were transferred from 1:24,000
unpublished field maps of R.A. Hope (University of California, Los Angeles,
1964-1966) to stable-base greenline of the San Bernardino Wash 7.5 minute quadrangle
and digitized using an Altek Datatab digitizer. Measurement attributes of Hope's
data were entered from azimuths recorded in field notes, where available, or by
measuring azimuths from strike-and-dip symbols on his maps.
Process_Date: 2002
Process_Step:
Process_Description:
First draft of metadata created by Cossette using FGDCMETA.AML ver. 1.2 05/14/98 on
ARC/INFO data set /pool5/pool1/cossette/1_joshua/1_sbw/sbw0425a
Process_Date: 20020425
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: 1902
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: String
Point_and_Vector_Object_Count: 4743
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
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:
The Geologic Map and Digital Database of the San Bernardino Wash 7.5 minute
quadrangle includes five double precision ARCINFO coverages: sbwash_geo (geology);
sbwash_flt (faults and structural line ornamentation); sbwash_dike (dikes);
sbw_structure, (structural point data); and sbwash_carto (cartographic elements,
geologic unit annotation and leaders). Geospatial entities in ARC/INFO coverages
have the following software-defined attributes: <cover>.pat contains AREA,
PERIMETER, cover#, and cover-ID; <cover>.aat contains FNODE#, TNODE#, LPOLY#,
RPOLY#, LENGTH, cover#, and cover-ID. User-defined attributes are described in
detail below.
(1) The coverage sbwash_geo includes the following feature tables: (a) A polygon
attribute table (sbwash_geo.pat) that lists labels for the geological
characteristics and identifies plot labels for the rock units represented in the
Postscript (.ps) and Portable Document Format (.pdf) plotfiles of the geologic
maps; (b) Region subclass attribute tables that describe the geospatial
distribution of rock units represented in the Postscript (.ps) and Portable
Document Format (.pdf) plotfiles of the geologic maps (sbwash_geo.patrockunit), the
hierarchical array of stratigraphic parents of rock units in the crystalline
basement (sbwash_geo.patbasement1, sbwash_geo.patbasement2,
sbwash_geo.patbasement3, sbwash_geo.patbasement4), the hierarchical array of
stratigraphic parents of rock units in sedimentary and volcanic cover to the
basement rocks (sbwash_geo.patcover2), and the hierarchical array of stratigraphic
parents of surficial units (sbwash_geo.patsurficial1, sbwash_geo.patsurficial2,
sbwash_geo.patsurficial3, sbwash_geo.patsurficial4, sbwash_geo.patsurficial5).
This hierarchy of stratigraphic units can be related in ArcInfo, ArcMap or ArcView
to display or plot more generalized, derivative geologic maps than that represented
in Postscript (.ps) or Portable Document Format (.pdf) files. (c) A region
subclass attribute table that describes surface units (veneers)
(sbwash_geo.patsurfunit). (d) A region subclass attribute table that shows those
areas where unit identification is uncertain (sbwash_geo.patident). (e) An arc
attribute table (sbwash_geo.aat) that describes the contacts that bound rock-unit
polygons.
(2) The coverage sbwash_flt contains and displays the complete distribution of
fault features within the extent of the San Bernardino Wash quadrangle. Structural
line ornamentation is included in this layer as point data. Faults are
characterized in two route attribute tables (sbwash_flt.ratsegment and
sbwash_flt.ratfault).
(3) The coverage sbwash_dike includes an arc attribute table (sbwash_dike.aat) that
describes hypabyssal dikes. Dikes are planar intrusive features that intersect the
Earth's surface as linear features; they are represented as lines where their
surface widths are too narrow to be represented as areal features at a scale of
1:24,000.
(4) The coverages sbw_structure includes a point attribute tables
(sbw_structure.pat) that describe geologic structural point data, including the
types and orientation of bedding and foliation. An annotation subclass (anno.dip -
planar data) displays the dip values associated with each point datum.
(5) The coverage sbwash_carto includes both geologic unit symbol annotation and an
arc attribute table (sbwash_carto.aat) that displays annotation leaders. Unit
symbols placed outside the perimeter of a particular polygon are identified by
annotation leaders.
Polygon attribute table that stores alphanumeric symbols for units that characterize
lithologic type, surface veneer, landform, and age of earth materials represented by
each polygon. In addition, the table stores coded stratigraphic unit symbols.
Attribute:
Attribute_Label: POLY_LABEL
Attribute_Definition:
List of alphanumeric symbols that describe geologic characteristics of earth
materials represented by each polygon: this attribute is used for data entry.
Map units are described in region feature subclasses.
Attribute:
Attribute_Label: SURF_LABEL
Attribute_Definition:
Alphanumeric symbol for surface material represented by polygon (unique in this
dataset).
Attribute:
Attribute_Label: ROCK_LABEL
Attribute_Definition:
Alphanumeric symbol for rock unit represented by polygon (unique in this dataset)
Attribute:
Attribute_Label: POLY_IDENT
Attribute_Definition:
An expression of confidence that a map unit represented by a particular polygon has
been correctly identified (certain, likely, or questionable)
Attribute:
Attribute_Label: GMPH_LABEL
Attribute_Definition:
Alphanumeric symbol for geomorphic unit represented by polygon (unique in this
dataset).
Attribute:
Attribute_Label: PLOT_LABEL
Attribute_Definition:
Coded symbols used to plot label of geologic units shown on geologic map in
Postscript (.ps) and Portable Document Format (.pdf) files. Item can be related to
data table, display.plt.
Detailed_Description:
Entity_Type:
Entity_Type_Label: sbwash_geo.patrockunit
Entity_Type_Definition:
Geologic units contained in the database that are displayed on the geologic map in
the Postscript (.ps) and Portable Document Format (.pdf) files
Attribute:
Attribute_Label: UNIT_LABEL
Attribute_Definition: Rock-unit label
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Jmi
Enumerated_Domain_Value_Definition:
Mafic and intermediate intrusive suite (Middle or Early Jurassic)
The map boundary forms part of the perimeter of polygons that occur along the margins
of the map.
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: contact
Enumerated_Domain_Value_Definition:
Boundary between two rock units; formed as fault, intrusive border, bedding plane, or
unconformity
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: facies boundary
Enumerated_Domain_Value_Definition:
Intra-unit lithologic boundary between coeval deposits derived either from different
source terranes or from different drainage basins in the same source terrane
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: fault-line scarp
Enumerated_Domain_Value_Definition: Steep slope formed by differential erosion along a fault line
Attribute:
Attribute_Label: CLASS_ORIG
Attribute_Definition: Classification of contact by origin
Attribute:
Attribute_Label: MOD_SEQ
Attribute_Definition: Sequence of processes by which contact has been modified
Attribute:
Attribute_Label: CLASS_ALT
Attribute_Definition: Alternative classifiction of type of contact
Attribute:
Attribute_Label: AGE_PREF
Attribute_Definition: Preferred age of contact
Attribute:
Attribute_Label: AGE_LINEAGE
Attribute_Definition: Hierarchical age list of linear feature
Attribute:
Attribute_Label: DESCRIPTION
Attribute_Definition: Contact description
Attribute:
Attribute_Label: SYMB
Attribute_Definition:
Coded integer symbol that relates arc to cartographic line symbol in lineset
(geoscamp2.lin)
Attribute:
Attribute_Label: DEFINITION
Attribute_Definition: Degree to which contact is discrete
Attribute:
Attribute_Label: EXPOSURE
Attribute_Definition:
An expression of how well a contact is represented by a line (discrete or
nondiscrete)
Attribute:
Attribute_Label: SOURCE_DATA
Attribute_Definition: Data source for contact
Detailed_Description:
Entity_Type:
Entity_Type_Label: sbwash_flt.aat
Entity_Type_Definition: Faults
Attribute:
Attribute_Label: CLASS_TYPE
Attribute_Definition: Classification of line by type (fault)
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: fault
Enumerated_Domain_Value_Definition:
Surface or zone of surfaces separating two bodies of rock and across which one body
has slid past the other
Attribute:
Attribute_Label: CLASS_ALT
Attribute_Definition: Alternative classification of fault
Attribute:
Attribute_Label: EXPOSURE
Attribute_Definition: Degree to which fault is exposed
Attribute:
Attribute_Label: LOCATION
Attribute_Definition: Accuracy of horizontal position of fault on input base map
Attribute:
Attribute_Label: SYMB
Attribute_Definition:
Coded integer symbol that relates arc to cartographic line symbol in lineset
(geoscamp2.lin)
Detailed_Description:
Entity_Type:
Entity_Type_Label: sbwash_flt.ratsegment
Entity_Type_Definition:
Fault segments: Arcs between or extending from fault intersections
Attribute:
Attribute_Label: FLT_SEG
Attribute_Definition: Unique identification of fault segment
Attribute:
Attribute_Label: ANGLE
Attribute_Definition: Classification by angle of dip
Attribute:
Attribute_Label: SEPARATION
Attribute_Definition: Classification by separation on fault segments
Attribute:
Attribute_Label: SLIP
Attribute_Definition: Classification by slip on fault segment
Attribute:
Attribute_Label: AGE
Attribute_Definition:
Age interval during which movement has occurred along fault segment
Attribute:
Attribute_Label: BASIS
Attribute_Definition: Basis for representation of fault segment
Attribute:
Attribute_Label: CONFIDENCE
Attribute_Definition:
An expression of confidence that a fault segment has been correctly identified
Attribute:
Attribute_Label: SOURCE
Attribute_Definition: Data source for fault segment
Detailed_Description:
Entity_Type:
Entity_Type_Label: sbwash_flt.ratfault
Entity_Type_Definition:
Faults, fault strands, fault zones, fault systems, and fault groups
Attribute:
Attribute_Label: SEPARATION
Attribute_Definition:
Classification by separation on fault, fault strand, fault zone, fault system or
fault group
Attribute:
Attribute_Label: SLIP
Attribute_Definition:
Classification by slip on fault, fault strand, fault zone, fault system or fault
group
Attribute:
Attribute_Label: AGE
Attribute_Definition:
Age interval during which movement occurred on fault, fault strand, fault zone, fault
system or fault group
Attribute:
Attribute_Label: FLTNAME
Attribute_Definition:
Name of fault, fault strand, fault zone, fault system or fault group
Attribute:
Attribute_Label: MECH_REG
Attribute_Definition: Classification of fault by mechanical regime
Attribute:
Attribute_Label: KINEM_REG
Attribute_Definition: Classification of fault by kinematic regime
Attribute:
Attribute_Label: TECT_GEN
Attribute_Definition: Genetic classification of fault by tectonic system
Attribute:
Attribute_Label: FLT_DESC
Attribute_Definition:
Description of fault, fault strand, fault zone, fault system or fault group
Detailed_Description:
Entity_Type:
Entity_Type_Label: sbwash_dike.aat
Entity_Type_Definition: Dikes
Attribute:
Attribute_Label: SYMB
Attribute_Definition:
Coded integer symbol that relates arc to cartographic line symbol in lineset
(geoscamp2.lin)
Enumerated_Domain_Value_Definition: Dike rocks, undivided (Tertiary, Cretaceous, or Jurassic)
Detailed_Description:
Entity_Type:
Entity_Type_Label: sbw_structure.pat
Entity_Type_Definition:
Planar structural point data showing bedding and foliation orientation (strike, dip,
direction of dip)
Detailed_Description:
Entity_Type:
Entity_Type_Label: ru_summ.dsc
Entity_Type_Definition:
INFO table that summarizes name, age, origin, and lithology of rock units.
Attribute:
Attribute_Label: UNIT_LABEL
Attribute_Definition: Alphanumeric symbol
Attribute:
Attribute_Label: UNIT_NAME
Attribute_Definition: Name of rock unit
Attribute:
Attribute_Label: AGEPAR_LS
Attribute_Definition:
List of age names in parent lineage of rock unit stratigraphic age indicated in unit
label
Attribute:
Attribute_Label: AGE_LABEL
Attribute_Definition: Name of stratigraphic age of rock unit indicated in unit label
Attribute:
Attribute_Label: AGECHLD_LS
Attribute_Definition:
List of names in child lineage of rock unit stratigraphic age indicated in unit label
Attribute:
Attribute_Label: ARCH_LEVEL
Attribute_Definition:
Present-day architectural level of rock unit (crystalline basement, cover, surficial
deposit, surface veneer)
Attribute:
Attribute_Label: ENVIR_ORIG
Attribute_Definition:
Hierarchical list of classification terms for origin and environment of formation of
rock unit
Attribute:
Attribute_Label: UNIT_TYPE
Attribute_Definition: Type of rock unit
Attribute:
Attribute_Label: ROCK_FORM
Attribute_Definition: Form or landform of rock unit body
Attribute:
Attribute_Label: LITH_GROUP
Attribute_Definition: List of parent lithologic groups to which rock unit belongs
Attribute:
Attribute_Label: LITH_PRINC
Attribute_Definition: Principal lithologic components of rock unit
Attribute:
Attribute_Label: LTH_SUBORD
Attribute_Definition: Subordinate lithologic components of rock unit
Attribute:
Attribute_Label: LITH_MINOR
Attribute_Definition: Minor lithologic components of rock unit
Detailed_Description:
Entity_Type:
Entity_Type_Label: display.plt
Entity_Type_Definition:
Data table that stores display criteria and data (rock unit colors/SHD,
patterns/SHDFIL) to facilitate plotting of derivative maps. Symbolsets are:
scamp2.shd (colors), geology2.shd (patterns).
Detailed_Description:
Entity_Type:
Entity_Type_Label: overlay.lut
Entity_Type_Definition:
Data (lookup) table that stores symbols that allow surface veneers to be represented
as pattern overlays.
Detailed_Description:
Entity_Type:
Entity_Type_Label: sbwash_carto.aat
Entity_Type_Definition:
Annotation leaders and rock_unit labels derived from sbwash_geo.pat, plot_label
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: CO
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 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.
This digital, geologic map database of the San Bernardino Wash 7.5'quadrangle, and
any derivative maps thereof, is not meant to be used or displayed at any map scale
larger than 1:12,000 on the DOQQ base or 1:24,000 on the topograhic base.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ArcInfo export
Format_Version_Number: 8.x
Format_Information_Content: Geologic units and structural features
Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Access_Constraints: none
Metadata_Use_Constraints: none
This page is <http://geo-nsdi.er.usgs.gov/metadata/open-file/02-498/metadata.html> How other people discovered this page
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