Geologic Map of the San Bernardino North 7.5' Quadrangle, San Bernardino County, California, USGS OFR 01-131
Entry ID: USGS_OFR01-131

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Summary
Abstract: The data set for the San Bernardino North 7.5' quadrangle was prepared under
the U.S. Geological Survey Southern California Areal Mapping Project (SCAMP) a
part of an ongoing effort to develop a regional geologic framework of southern
California, and to utilize a Geographical Information System (GIS) format to
create regional digital geologic databases. These regional databases are being
developed as contributions to the National Geologic Map Database of the
National Cooperative Geologic Mapping Program of the USGS.

The digital geologic map database for the San Bernardino North 7.5' quadrangle
has been created as a general-purpose data set that is applicable to other
land-related investigations in the earth and biological sciences. For example,
itcan be used for groundwater studies in the San Bernardino basin, and for
mineral resource evaluation studies, animal and plant habitat studies, and soil
studies in the San Bernardino National Forest. The database is not suitable
for site-specific geologic evaluations.

This data set maps and describes the geology of the San Bernardino North 7.5'
quadrangle, San Bernardino County, California. Created using Environmental
Systems Research Institute's ARC/INFO software, the data base consists of the
following items: (1) a map coverage containing geologic contacts and units, (2)
attribute tables for geologic units (polygons), contacts (arcs), and
site-specific data (points). In addition, the data set includes the following
graphic and text products: (1) A PostScript graphic plot-file containing the
geologic map, topography, cultural data, a Correlation of Map Units (CMU)
diagram, a Description of Map Units (DMU), an index map, a regional geologic
and structure map, and a key for point and line symbols; (2) PDF files of this
Readme (including the metadata file as an appendix), Description of Map Units
(DMU), and the graphic produced by the PostScript plot file.

The geologic map covers a part of the southwestern San Bernardino Mountains and
the northwestern San Bernardino basin. Granitic and metamorphic rocks underlie
most of the mountain area, and a complex array of Quaternary deposits fill the
basin. These two areas are separated by strands of the seismically active San
Andreas Fault. Bedrock units in the San Bernardino Mountains are dominate by
large Cretaceous and Jurassic granitic bodies, ranging in composition from
onzogranite to monzodiorite, and include lesser Triassic monzonite. The younger
of these granitic rocks intrude a complex assemblage of gneiss, marble, and
granitic rock of probable early Mesozoic age; the relationship between these
metemorphic rocks and the Triassic rocks is unknown. Spanning the Pleistocene
in age, large and small alluvial bodies emerge from the San Bernardino
Mountains, and and fill the San Bernardino basin. In the southwestern part of
the quadrangle, Cajon Wash carries sediments from both the San Bernardino and
San Gabriel Mountains, and Lytle Creek heads in the eastern San Gabriel
Mountains. Limite bedrock areas showing through the Quaternary sediments of the
basin consist exclusively of Mesozoic Pelona Schist locally intruded by
Tertairy dikes. Youthful-appearing fault scarps discontinuously mark the
traces of the San Andreas Fault along the southern edge of the San Bernardino
Mountains. Unnamed Tertiary sedimentary rocks are bounded by two strands of
the fault between Badger Canyon and the east edge of the quadrangle. Young and
old high-angle faults cut bedrock units within the San Bernardino Mountains,
and the buried, seismically active San Jacinto Fault traverses the southwestern
part of the quadrangle.

The geologic map database contains original U.S. Geological Survey data
generated by detailed field observation and by interpretation of aerial
photographs. This digital Open-File map superceeds an older analog Open-File
map of the quadrangle, and includes extensive new data on the Quaternary
deposits, and revises some fault and bedrock distribution within the San
Bernardino Mountains. The digital map was compiled on a base-stable cronoflex
copy of the San Bernardino North 7.5' topographic base and then scribed. This
scribe guide was used to make a 0.007 mil blackline clear-film, which was
scanned at 1200 DPI by Optronics Specialty Company, Northridge, California;
minor hand-digitized additions were made at the USGS. Lines, points, and
polygonswere subsequently edited at the USGS using standard ARC/INFO commands.
Digitizing and editing artifacts significant enough to display at a scale of
1:24,000 were corrected. Within the database, geologic contacts are
represented as lines (arcs), geologic units as polygons, and site-specific data
as points. Polygon, arc, and point attribute tables (.pat, .aat, and .pat,
respectively) uniquely identify each geologic datum.

Related URL
Link: GET DATA
Description: Access to data an documentation for USGS OFR 01-131


Geographic Coverage
 N: 34.25 S: 34.124985  E: -117.24991  W: -117.37509

Data Set Citation
Dataset Originator/Creator: Fred K. Miller
Dataset Title: Geologic Map of the San Bernardino North 7.5' quadrangle, San Bernardino County, California
Dataset Series Name: U.S. Geological Survey Open-File Report
Dataset Release Date: 2001
Dataset Release Place: Menlo Park, California
Dataset Publisher: U.S. Geological Survey
Version: Version 1.0
Data Presentation Form: vector digital data
Online Resource: http://geopubs.wr.usgs.gov/open-file/of01-131/


Temporal Coverage
Start Date: 1974-01-01
Stop Date: 1981-12-31


Location Keywords
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > CALIFORNIA


Data Resolution
Latitude Resolution: 0.0010000000474 m
Longitude Resolution: 0.0010000000474 m


Science Keywords
SOLID EARTH >GEOMORPHIC LANDFORMS/PROCESSES >AEOLIAN LANDFORMS    [Definition]
SOLID EARTH >GEOMORPHIC LANDFORMS/PROCESSES >FLUVIAL LANDFORMS    [Definition]
SOLID EARTH >GEOMORPHIC LANDFORMS/PROCESSES >TECTONIC LANDFORMS    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >AGE DETERMINATIONS    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >BEDROCK LITHOLOGY    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >IGNEOUS ROCKS    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >METAMORPHIC ROCKS    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >MINERALS    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >SEDIMENTARY ROCKS    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >SEDIMENTS    [Definition]
SOLID EARTH >TECTONICS >PLATE TECTONICS >FAULT MOVEMENT    [Definition]
SOLID EARTH >TECTONICS >PLATE TECTONICS >FOLDS    [Definition]
SOLID EARTH >TECTONICS >PLATE TECTONICS >STRATIGRAPHIC SEQUENCE    [Definition]


ISO Topic Category
GEOSCIENTIFIC INFORMATION


Platform
MAPS    [Information]


Project
SCAMP >Southern California Areal Mapping Project    [Information]


Access Constraints
None


Use Constraints
The San Bernardino North 7.5' geologic-map database should be used to evaluate
and understand the geologic character of the San Bernardino North 7.5'
quadrangle as a whole. The data should not be used for purposes of
site-specific land-use planning or site-specific geologic evaluations. The
database is sufficiently detailed to identify and characterize geologic
materials and structures. However, it is not sufficiently detailed for
site-specific determinations. Use of this digital geologic map database should
not violate the spatial resolution of the data. Although the digital form of
the data removes the constraint imposed by the scale of a paper map, the detail
and accuracy inherent in map scale are also present in the digital data. The
fact that this database was compiled and edited at a scale of 1:24,000 means
that higher resolution information may not have been uniformly retained in the
data set. Plotting at scales larger than 1:24,000 will not yield greater real
detail, although it may reveal fine-scale irregularities below the intended
resolution of the database. Similarly, although higher resolution data is
incorporated in parts of the map, the resolution of the combined output will be
limited by the lower resolution data.


Keywords
geologic map
geology
bedrock geology
surficial geology
San Andreas Fault
Triassic monzonite
Jurassic granitic rocks
Pelona Schist
GIS
landslide deposits
alluvial-fan deposits
eolian deposits
Conglomerate and arkose
Conglomerate of Crestline
Hypabyssal granitic dikes
Biotite monzogranite
Granodiorite of Lake Gregory
Quartz monzonite of Crestline
Gneiss of Devils Canyon
Granodiorite of Arrowhead Peak
Monzonite of Cedarpines Park
Carbonate rocks
wash deposits
colluvial deposits
talus deposits
Mesozoic
Geoage Font Group
strike slip
reverse slip
oblique slip
California
San Bernardino County
San Bernardino North 7.5' quadrangle


Data Set Progress
COMPLETE


Originating Center
USGS


Data Center
Publications-Western Region,Geological Division, U.S. Geological Survey, U.S. Department of the Interior    [Information]
Data Center URL: http://geopubs.wr.usgs.gov/
Dataset ID: USGS Open-File Report 01-131

Data Center Personnel
Name: CAROLYN A. DONLIN
Phone: 650-329-5015
Fax: 650-329-5119
Email: cdonlin at usgs.gov
Contact Address:
U.S. Geological Survey
Geology Division
345 Middlefield Road
City: Menlo Park
Province or State: California
Postal Code: 94025
Country: USA



Distribution
Distribution_Media: online
Distribution_Size: 2.6 megabytes
Distribution_Format: ArcInfo Export
Fees: none


Personnel
FRED K. MILLER
Role: TECHNICAL CONTACT
Phone: (509) 368-3120
Email: fmiller at usgs.gov
Contact Address:
U.S. Geological Survey
904 West Riverside Avenue, Rm. 202
City: Spokane
Province or State: WA
Postal Code: 99201-1087
Country: USA


PAMELA M. COSSETTE
Role: DIF AUTHOR
Phone: (509) 368-3123
Fax: (509) 368-3199
Email: pcossette at usgs.gov
Contact Address:
Western Earth Surface Processes Team
U.S. Geological Survey
Federal Building
U. S. Post Office
W. 904 Riverside Ave, Ste. 202
City: Spokane
Province or State: WA
Postal Code: 99201-1011
Country: USA


Publications/References
Fred K. Miller. 1979. Geologic map of the San Bernardino North quadrangle,
California, U.S. Geological Survey Open-File Report 79-770, Menlo Park,
California, U.S. Geological Survey

Creation and Review Dates
DIF Creation Date: 2001-05-18
Last DIF Revision Date: 2005-04-11

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