D Earth Fissure Map of the Toltec Buttes Study Area: Pinal

Arizona Geological SurveyDM-EF-6 (Toltec Buttes), v. 2.0

Earth Fissure Map of theToltec Buttes Study Area:

Pinal County, ArizonaJune 2019

Arizona Geological SurveyDigital Map Series - Earth Fissure Map 6 (DM-EF-6)

version 2.0

Notice The State of Arizona has made a reasonable effort to ensure the accuracy of this map when it was produced, but errors may be present and the state of Arizona does not guarantee its accuracy. The map supplements, and is not a substitute for, a professional inspection of property for defects and conditions. Introduction This is one of a series of earth fissure maps prepared by the Arizona Geological Survey (AZGS) in accordance with Ariz. Rev. Stat. § 27-152.01(3). AZGS collected location information from previously conducted earth fissure studies, reviewed available remote-sensing aerial and satellite imagery, and conducted surface site investigations throughout the study area. A reasonable effort was made to identify all earth fissures in the study area. Nonetheless, some fissures may remain unmapped as a result of one or more of the following: 1) Existing fissures may have been masked by construction or agricultural activities. 2) Incipient fissures may lack clear surface expression. 3) The surface expression of fissures changes constantly as new earth fissures

develop and old earth fissures fill in. A blank area on the map does not guarantee earth fissures are not present. However, blank areas within the study area boundary have been investigated, and no surface evidence of fissures was found as of the date of map publication. Determining the presence or absence of a fissure at any specific site may require additional mapping and/or geotechnical analysis.

Air photo base compiled from 2017, 1 meter NAIP (National Agriculture Imagery Program) digital ortho imagery. Transporation network dataset compiled by Arizona State Lands Dept. by combining the 2007 County Road Data of Maricopa, Pima, Pinal and Cochise Counties with the Census 2000 Tiger/Line Data of the remaining Counties. Map projection and blue, 1000-meter grid ticks: Universal Transverse Mercator, zone 12 North American Datum 1983 HARN References Harris, R.C., 1994, A reconnaissance of earth fissures near Apache Junction, Chandler

Heights, and southwestern Picacho Basin: Arizona Geological Survey Open-File Report 94-11, 5 p., 2 sheets, scales 1:24,000 and 1:26,700.

Jachens, R.C., and Holzer, T.L., 1982, Differential compaction mechanism for earth

fissures near Casa Grande, Arizona: Geological Society of America Bulletin, v. 93, no. 10, p. 998-1012.

Jackson, Garrett, 1990, Surficial geologic maps of the Picacho Basin [Picacho

Reservoir, Newman Peak, Casa Grande Mtns., Eloy North, and Eloy South 7.5 min]: Arizona Geological Survey Open-File Report 90-02, 9 p., 5 sheets, scale 1:24,000.

Laney, R.L., Raymond, R.H., and Winikka, C.C., 1978, Maps showing water-level

declines, land subsidence, and earth fissures in south-central Arizona: U.S. Geological Survey Water-Resources Investigations Open-File Report WRI 78-0083, 2 sheets, scale 1:125,000.

Pashley, E.F., Jr., 1961, Subsidence cracks in alluvium near Casa Grande, Arizona:

Arizona Geological Society Digest, v. 4, p. 95-101. Slaff, Steven, Jackson, G.W., and Pearthree, P.A., 1989, Development of earth fissures

in Picacho basin, Pinal County, Arizona from 1959 to 1989 [Newman Peak, Picacho Reservoir, Casa Grande Mtns., Eloy South, Eloy North, and Valley Farms 7.5 min]: Arizona Geological Survey Open-File Report 89-10, 38 p., 6 sheets, scale 1:24,000.

Arizona Geological Survey1955 East Sixth Street, PO Box 210184

Tucson, AZ 85721(520) 621-2470

www.azgs.arizona.edu

MAP LEGENDRed lines represent the location of continuous earth fissures manifested as open cracks orgullies.Orange lines represent the location of discontinuous earth fissures manifested as elongatedto circular depressions or as abbreviated or irregular linear depressions. Thesediscontinuous surface features frequently represent an incipient surface expression of anearth fissure.Yellow lines represent the location of fissures confirmed by non-AZGS personnel or clearevidence of earth fissures on aerial imagery. Traditional field investigation of these featuresby AZGS was hindered by agricultural or urban modification of the land surface.Green lines represent the approximate locations of unconfirmed earth fissures, defined asfissures which could not be confirmed by surface investigations by AZGS geologists, butwhich have been previously reported by Professional Geologists in published documents ormaps.The outline of the Study Area is shown in blue. The limits of the study area are based oninterpretation of modern and recent ground subsidence data provided by the ArizonaDepartment of Water Resources. Historical and modern aerial photos taken within thisarea were searched for anomalous lineaments. These lineaments were then investigated inthe field to determine if there was any evidence of earth fissures.

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