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Surficial geologic map of the Amboy 30' x 60' quadrangle, San Bernardino County, California

Scientific Investigations Map 3109

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Abstract

The surficial geologic map of the Amboy 30' x 60' quadrangle presents characteristics of surficial materials for an area of approximately 5,000 km2 in the eastern Mojave Desert of southern California. This map consists of new surficial mapping conducted between 2000 and 2007, as well as compilations from previous surficial mapping. Surficial geologic units are mapped and described based on depositional process and age categories that reflect the mode of deposition, pedogenic effects following deposition, and, where appropriate, the lithologic nature of the material. Many physical properties were noted and measured during the geologic mapping. This information was used to classify surficial deposits and to understand their ecological importance. We focus on physical properties that drive hydrologic, biologic, and physical processes such as particle-size distribution (PSD) and bulk density. The database contains point data representing locations of samples for both laboratory determined physical properties and semiquantitative field-based information in the database. We include the locations of all field observations and note the type of information collected in the field to help assist in assessing the quality of the mapping. The publication is separated into three parts: documentation, spatial data, and printable map graphics of the database. Documentation includes this pamphlet, which provides a discussion of the surficial geology and units and the map. Spatial data are distributed as ArcGIS Geodatabase in Microsoft Access format and are accompanied by a readme file, which describes the database contents, and FGDC metadata for the spatial map information. Map graphics files are distributed as Postscript and Adobe Portable Document Format (PDF) files that provide a view of the spatial database at the mapped scale.

Study Area

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Surficial geologic map of the Amboy 30' x 60' quadrangle, San Bernardino County, California
Series title:
Scientific Investigations Map
Series number:
3109
Year Published:
2010
Language:
English
Publisher:
U.S. Geological Survey
Publisher location:
Reston, VA
Contributing office(s):
Geology and Geophysics Science Center
Description:
Pamphlet: iv, 20 p.; Figures; Map: 1 Sheet: 56.00 x 30.00 inches; Readme TXT; Metadata TXT; ZIP Download of Data
Country:
United States
State:
California
County:
San Bernadino County
Datum:
NAD27
Projection:
Universal Transverse Mercator projection
Scale:
100000
Online Only (Y/N):
Y
Additional Online Files(Y/N):
Y