Arizona Geological Survey Open File Reports


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Published: 2008
Recent analysis of subsurface data indicates a resource containing from 0.7 to 2.5 billion metric tons of potash in the Holbrook basin of east-central Arizona, some of which underlies Petrified...
Resource Identifiers: OFR-08-07

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Published: 2008
On 21 March 2008, a landslide occurred at about mile marker 224 on State Route 87 (SR‐87) (northeast of Iron Dike mountain), in Gila County, causing sufficient damage to require the highway to be...
Resource Identifiers: OFR-08-04

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Published: 2007
The Arizona Geological Survey (AZGS) is tasked by statutes approved in House Bill 2639 of the 2006 legislative session to undertake comprehensive mapping of earth fissures and deliver earth fissure...
Resource Identifiers: OFR-07-01

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Published: 2007
Much of the Plio-Pleistocene sediment in the San Pedro River Valley near Benson (Cochise County, southeastern Arizona) reflects a past depositional environment in which clastic debris was shed from...
Resource Identifiers: OFR-07-02

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Published: 2006
Throughout the southwestern United States, vegetation in what historically was grassland has changed to a mixture of trees and shrubs; exotic grass species and undesirable shrubs have also invaded...
Resource Identifiers: OFR-06-02

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Published: 2006
The Catalina Highway, which extends from the Tucson metropolitan area up the south side of the Santa Catalina Mountains to the top of the range, provides easy access to some very interesting...
Resource Identifiers: OFR-06-01

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Published: 2005
This report is intended to be both a teaching and field guide for a spectacularly exposed sequence of silicic volcanic rocks in the northern Superstition Mountains, south-central Arizona. The...
Resource Identifiers: OFR-05-01

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Published: 2004
The 1:24,000 scale geologic map that is the basis for this report covers part of the central Mazatzal Mountains in the area where the Beeline Highway (State Highway 87) crosses the range (Figure 1)....
Resource Identifiers: OFR-04-03

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Published: 2004
Giant desiccation cracks are common in southwestern U.S. playas and have been reported in several areas of Arizona but they are much more common than previously recognized. These giant cracks are...
Resource Identifiers: OFR-04-01

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Published: 2004
Management of flood hazards on alluvial piedmonts in the southwestern United States is increasingly important because urban development is rapidly expanding into these areas. Flows are very...
Resource Identifiers: OFR-04-02

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Published: 2004
In the evening of July 27, 1988, an extreme flood inundated the channels and floodplains of a relatively pristine, undeveloped alluvial fan associated with Wild Burro Wash, located on a desert...
Resource Identifiers: OFR-04-04

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Published: 2003
Subsurface strata of Pennsylvanian and Permian age in the western Holbrook Basin are correlated with outcrops in Grand Canyon and Sedona area. Subsurface correlations on the four cross sections are...
Resource Identifiers: OFR-03-01

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Published: 2003
Preliminary geologic map of the Meddler Wash 7.5' Quadrangle, Gila County, Arizona - one map sheet, scale 1:24,000.
Resource Identifiers: OFR-03-04

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Published: 2003
The results of 40 Ar/39 Ar analyses of 15 samples of rhyolitic ash-flow tuffs and one sample of a dacitic dome from Mid-Tertiary and Cretaceous volcanic successions in the Tucson area are presented...
Resource Identifiers: OFR-03-02

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Published: 2003
Sixteen rock samples were collected from several mountain ranges in southern and central Arizona to determine their cooling history as revealed by 40 ArP9 Ar thermochronology. This was done by...
Resource Identifiers: OFR-03-03

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Published: 2003
Some of the richest helium-bearing gas in the world was produced from fields completed specifically for helium in northeastern Arizona in the 1960s and 1970s. All production came from fields in...
Resource Identifiers: OFR-03-05

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Published: 2003
During the past several years accusations have been made that sand and gravel operations along the Agua Fria River near Sun City are exposing nearby residents to asbestos. The Arizona Geological...
Resource Identifiers: OFR-03-06

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Published: 2003
Geochronologic analyses of igneous rocks were done over the past several years as part of the joint State-Federal STATEMAP program. These analyses were done to determine the age of rocks in areas...
Resource Identifiers: OFR-03-08

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Published: 2003
Giant desiccation cracks have been discovered in two areas near the settlement of Wintersburg (Figure 1) on detailed aerial photos obtained from Maricopa County Flood Control District. One area is...
Resource Identifiers: OFR-03-07

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Published: 2003
Granitic rocks are classified by their relative proportions of quartz, plagioclase feldspar, and potassium feldspar. Geologic mapping in the Mesa 19 x 29 Quadrangle by the Arizona Geological Survey...
Resource Identifiers: OFR-03-09

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