Arizona Geological Survey Open File Reports
The Palomas Mountains are located approximately 70 miles northeast of Yuma, Arizona, and
about 15 miles north of the town of Dateland in eastern Yuma County (Figure 1). Across a narrow
valley to...
Resource Identifiers: OFR-94-09
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Two active alluvial fans in the tectonically quiescent region of southern Arizona are
composed of discontinuous ephemeral stream systems characterized by alternating channelized
reaches and...
Resource Identifiers: OFR-94-12
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Earth fissures are tension cracks that form in response to land subsidence caused by groundwater pumping. Land subsidence is common in Arizona's alluvial basins, where extensive groundwater...
Resource Identifiers: OFR-94-11
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Virtually all rocks and soils contain uranium, which undergoes radioactive decay into hazardous radon gas. The average uranium concentration of crustal rocks is 2 to 3 parts per million (ppm)....
Resource Identifiers: OFR-90-05
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Uranium-vanadium deposits have been discovered and mined in the
Lukachukai Mountains, a high, rugged northwest spur of the Chuska
Mountains in northeastern Arizona. All of the economic deposits...
Resource Identifiers: OFR-88-19
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The Vulture Mountains, located directly southwest of Wickenburg in central Arizona,
contain one of Arizona's premier historic gold deposits, the Vulture Mine. This mine yielded
about 340,000...
Resource Identifiers: OFR-88-10
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Detailed geologic map and cross sections of the Big Horn and Belmont Mountains, West-central Arizona
The principal geologic feature of the Big Hom and Belmont Mountains is a complexly faulted and tilted
series of mostly Miocene volcanic rock that record a period of Middle Tertiary magmatism and...
Resource Identifiers: OFR-94-15
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The Tank Mountains of southwestern Arizona are a west-northwest trending range
which represent an approximately 30 km-Iong extension of a southeastern arm of the Kofa
Mountains. On all other sides...
Resource Identifiers: OFR-94-08
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Preliminary reconstruction of Miocene Extension in the Basin and Range of Arizona and adjacent areas
Large-scale continental extension significantly rearranged the distribution of pre-Tertiary rocks in southern
and western Arizona during Miocene time [Spencer and Reynolds, 1989a]. Topography...
Resource Identifiers: OFR-94-05
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This map depicts the distribution of geomorphic surfaces and associated alluvium of the
southern and southwestern piedmont of the Tortolita Mountains in Pima County, northwest of
Tucson, Arizona....
Resource Identifiers: OFR-93-14
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One of the fastest growing areas of Arizona is the eastern part of the Phoenix
Basin near the communities of Chandler, Gilbert, Mesa, and Apache Junction. Much of
this development has occurred on...
Resource Identifiers: OFR-93-15
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The central Verde River is one ofthe primary perennial, free-flowing streams in
Arizona. Portions ofthe river have been significantly impacted by human activities, and its
future flow may be...
Resource Identifiers: OFR-93-04
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Forty-three years ago, after the detonation of three atomic bombs
in 1945, the public became aware of atomic energy and the
Manhattan Project. The Manhattan Project was the code name used
by the...
Resource Identifiers: OFR-88-02
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This report presents the results of surficial geologic mapping of the Chandler
Heights and Sacaton NE, 7.5-minute quadrangles located in the Santan Mountain
piedmont area (herein referred to as...
Resource Identifiers: OFR-94-07
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Geologic map of Saddle Mountain, Maricopa County, Arizona.
Report and one map sheet, map scale 1:24,000.
Resource Identifiers: OFR-93-06
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Geologic map of the Lincoln Ranch Basin, eastern Buckskin Mountains, western Arizona. Report and one map sheet, map scale 1:24,000.
Resource Identifiers: OFR-86-02
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Detailed geologic map of the Upper Apache Wash Area, central southern Plomosa Mountains, west-central Arizona.
Report, one map sheet, map scale 1:12,000, and cross-sections.
Resource Identifiers: OFR-92-02
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Surficial and environmental geology of the Sierra Vista Area, Cochise County, Arizona.
Report and one map sheet, map scale 1:24,000.
Resource Identifiers: OFR-94-06
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Geology and mineral resources of the Sierra Estrella, Maricopa County, Arizona.
Report and one map sheet, map scale 1:50,000.
Resource Identifiers: OFR-92-15
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Radon gas, which is produced by the radioactive decay of uranium, can accumulate in homes
to levels that are considered hazardous by the U.S. Environmental Protection Agency. Hazardous indoor-radon...
Resource Identifiers: OFR-94-25
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