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#           Preliminary surficial geologic map of Leuhman Ridge and the surrounding area, Edwards Air Force Base and Air Force Research Laboratory, Kern and San Bernardino Counties, California      

      April 5, 2023    

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This preliminary geologic map presents mapping of the Leuhman Ridge area of Edwards Air Force Base, California, conducted between April 2020 and June 2021. The report focuses on surficial materials and bedrock to evaluate potential faults and other geologic features that may influence groundwater movement. The preliminary work confirms that the Spring Fault, previously mapped by Dibblee (1960, 1967), is a Quaternary-active fault but does not find convincing evidence to support the existence of the Leuhman Fault (Dibblee, 1960; 1967) within the map area. Several more possible and probable faults are identified by a combination of geomorphic lineaments and brecciated rock. Pleistocene and Holocene eolian deposits are widespread, manifesting as sand sheets, dunes, and admixtures into alluvial fans. Also, an incised pediment forms much of the upland south of Leuhman Ridge. In general, field observations indicate that Quaternary alluvial and eolian deposits are thin; this suggests that secondary bedrock porosity and permeability, defined by degree of weathering and fracture density that includes fault-related fracturing, are more important factors in the location and flow patterns of groundwater.

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April 5, 2023

####                 Digital Database for the Preliminary Surficial Geologic Map of Leuhman Ridge and the Surrounding Area, Edwards Air Force Base and Air Force Research Laboratory, Kern and San Bernardino Counties, California              

National Cooperative Geologic Mapping Program, Geology, Minerals, Energy, and Geophysics Science Center

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#### Andrew Cyr

##### Research Geologist

Geology, Minerals, Energy, and Geophysics Science Center

acyr@usgs.gov

650-439-2820

#### David M. Miller, Ph.D

##### Scientist Emeritus

Geology, Minerals, Energy, and Geophysics Science Center

dmiller@usgs.gov

650-439-2823

## Related Content

link

July 18, 2019

####                 Western Basin & Range - Eastern California Shear Zone              

National Cooperative Geologic Mapping Program, Geology, Minerals, Energy, and Geophysics Science Center

link

July 18, 2019

####   Western Basin & Range - Eastern California Shear Zone

Learn More

April 5, 2023

####                 Digital Database for the Preliminary Surficial Geologic Map of Leuhman Ridge and the Surrounding Area, Edwards Air Force Base and Air Force Research Laboratory, Kern and San Bernardino Counties, California              

National Cooperative Geologic Mapping Program, Geology, Minerals, Energy, and Geophysics Science Center

January 24, 2022

####                 Data release for luminescence: Edwards Air Force Base (CA) and CA Water Science Center report including luminescence data and ages              

National Cooperative Geologic Mapping Program, Geosciences and Environmental Change Science Center

#### Andrew Cyr

##### Research Geologist

Geology, Minerals, Energy, and Geophysics Science Center

acyr@usgs.gov

650-439-2820

#### David M. Miller, Ph.D

##### Scientist Emeritus

Geology, Minerals, Energy, and Geophysics Science Center

dmiller@usgs.gov

650-439-2823

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####               Geology, Minerals, Energy, and Geophysics Science Center          

Building 19, 350 N. Akron Rd.P.O. Box 158Moffett Field, CA94035United States

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