Geology and geomorphology of the San Bernardino Valley, southeastern Arizona

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Author
Biggs, T.H.
Leighty, R.S.
Skotnicki, S.J.
Pearthree, P.A.
Issue Date
1999-10-01
Keywords
Arizona Geological Survey Open File Reports
Pedregosa Mountains
Perilla Mountains
Cochise County
Arizona
San Bernadino Valley
bedrock
pyroclastic deposits
basaltic volcanic field
land-use management

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Citation
Biggs, T.H., Leighty, R.S., Skotnicki, S.J., and Pearthree, P.A., 1999, Geology and geomorphology of the San Bernardino Valley, southeastern Arizona. Arizona Geological Survey Open File Report, OFR-99-19, 3 map sheets, map scale 1:32,000, 20 p.
Publisher
Arizona Geological Survey (Tucson, AZ)
Description
The purpose of this project is to integrate new detailed field mapping, aerial photograph interpretation, previous research, and other available data into 1:24,000 scale geologic and geomorphic maps of the San Bernardino Valley study area (Map Pocket). Our goal is to describe the fundamental surficial and bedrock geology in a manner that can be incorporated into ecosystem and land-management research. Future work will integrate our geologic maps with soil and vegetation surveys for this portion of the Borderlands Region. The study area is in the extreme southeastern corner of Arizona in Cochise County (Figure 1). It is bounded on the south by the U.S.- Mexico border, on the east by the Arizona-New Mexico border, on the west by the Perilla and Pedregosa Mountains, and on the north-northwest by U.S. Highway 80. The main geographic features in the study area include the northern half of the San Bernardino Valley, the southern portion of the San Simon Valley, and the western side of the Peloncillo Mountains. The valleys formed during the Miocene-Pliocene period of high-angle normal faulting (the Basin and Range Disturbance) that produced alluvial basins of variable depth separated by bedrock mountains. The basins subsequently filled with volcanic and sedimentary deposits shed from the adjacent mountains and volcanic rocks erupted in the valleys. (20 pages)
URI
http://hdl.handle.net/10150/630767
Additional Links
https://library.azgs.arizona.edu/
Language
en
Series/Report no.
OFR-99-19
Rights
Arizona Geological Survey. All rights reserved.
Collection Information
Documents in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu.
North Bounding Coordinate
32.0826
South Bounding Coordinate
31.3443
West Bounding Coordinate
-109.731
East Bounding Coordinate
-109.061
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