Bedrock Geology of the Santan Mountains, Pinal and Maricopa Counties, Arizona v. 2.0

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Author
Ferguson, Charles A.
Skotnicki, Steven J.
Affiliation
Arizona Geological Survey
Issue Date
2024
Keywords
bedrock geology
crystalline rocks
fissure
Geology
metamorphics
pediment
volcanic
Cretaceous
Laramide Orogeny
Middle Tertiary

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Citation
Ferguson, C. A. and Skotnicki, S. J., 2024, Bedrock Geology of the Santan Mountains, Pinal and Maricopa Counties, Arizona v. 2.0, DGM-249
Publisher
Arizona Geological Survey (Tucson, AZ)
Description
The Santan Mountains are a 25 km long, west-northwest trending uplift composed chiefly of Proterozoic and Cretaceous crystalline rocks overlain in the central and eastern part of the range by Mid-Tertiary sedimentary and volcanic rocks. Santan Mountain at an elevation of 3010 feet is the range's highest point, rising nearly 1700 feet above the basin floor. Elevations decrease rapidly to the southeast towards the Gila River. The eastern two thirds of the range are composed of low hills connected by extensive areas of pedimented bedrock where relief is rarely greater than 400 feet. The range is bounded to the north by the Higley basin, and no extensive, pedimented bedrock surfaces exist here. Instead, abrupt thickening of the basin fill is suggested by the numerous earth fissures along the range's north edge (Harris, 1994; Sank, 1975). To the south, like the east, an extensive dissected granitic pediment extends all the way to the Gila river. Extensive pediments in the Sacaton Mountains to the southwest also probably extend northward to the Gila River, suggesting that the low area between the two ranges was created more by erosional processes than by tectonic processes. At Poston Butte, near the eastern terminus of the Santan Mountains, crystalline bedrock occurs less than ISO meters below the Gila River (Hoag, 1996). This geodatabase is part of a digital reproduction of a 1996 geologic map originally created by the Arizona Geological Survey funded by the Arizona Geological Survey and the U.S. Geological Survey STATEMAP Program Contract#1434-95-A-1353. Preparation for republication was conducted by students from the University of Arizona with financial support from the U.S. Geological Survey, National Geological and Geophysical Data Preservation Program (G23AP00215) and included the production of a new GIS geodatabase and a revised map layout. The following text report has not been altered and remains identical to the 1996 original, but there may be situations where unit names, ages, symbology, or other geologic information contained within this report do not match the information presented in the new map layout or GIS geodatabase.
URI
http://hdl.handle.net/10150/678598
Additional Links
https://library.azgs.arizona.edu/
Language
en
Series/Report no.
DGM-249
Rights
Arizona Geological Survey. All rights reserved.
Collection Information
Documents in the AZGS Documents 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
33.1997
South Bounding Coordinate
33.0019
West Bounding Coordinate
-111.802
East Bounding Coordinate
-111.469
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