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The geologic map described in this study covers the Horse Mesa Dam Quadrangle (1:24,000) (Figure 1) (Sheets I-III). The area encompasses part of the northern Superstition Mountains and southern Mazatzal Mountains. Bedrock in this area consists largely of Proterozoic granitic and metamorphic rocks overlain by a thick sequence of early Miocene volcanic rocks. The study in one of a series of related geologic maps from the Arizona Geological Survey that cover the Superstition volcanic field and adjacent areas (Ferguson and Gilbert, 1997; Ferguson and Skotnicki, 1995; Skotnicki and Ferguson, 1995, 1996; Skotnicki and Leighty, 1997; Spencer and Richard, 1995). The rugged physiography of the area is dominated by drainages...
Tags: Arizona,
geologic map
The Sawtooth Mountains are a small (45 km2 ), low-relief (250 m), yet rugged range composed of essentially flat-lying, Mid-Tertiary volcanic rocks. Along with the West Silver Bell Mountains, which consist mostly of Middle Proterozoic granitic rocks, the ranges form the southwestern boundary ofthe Picacho basin, a major north-trending, approximately 20 km-wide, 3 l<m-deep basin in the Basin and Range structural province of southern Arizona. Access on paved roads is possible from Interstate 10, taking Sunland Gin Road about 20 km south to within few kilometers ofthe Sawtooth Mountains. From this point, four-wheel drive vehicles are required to negotiate the crossings of sandy washes on all roads that lead into the...
Tags: geologic map
Surficial geologic map the Newman Peak Quadrangle of the Picacho Basin. The Picacho basin is a large and complex graben surrounded by horsts and half-horsts, which are now the Picacho, Casa Grande, Silverbell, and Sacaton mountains. It formed mainly in response to late Miocene extension. Internal drainage probably persisted until about 3 million years ago. Several thousand meters of sediments fill the basin; 2000 m of evaporites and claystone form the bulk of the basin fill (Scarborough and Pierce, 1978). The upper 200 meters or so of basin fill was deposited by a gradually aggrading, regionally integrated drainage system. Young alluvium of the Santa Cruz River is up to 30 m thick and is found within 3.2 km of the...
This study encompasses the southern part of both the Usery Mountains and the Goldfield Mountains and includes all areas where bedrock is exposed in the Apache Junction and Buckhorn USGS 7.5' topographic quadrangle maps (see figures 1 and 2}. The eastern edge of the study area includes part of the Superstition Mining District and contains many pits and prospects. The region is near the northern margin of the Basin and Range Province and the southern margin of the Transition Zone. Elevations range from about 1280 feet in the northwest comer of the map to 3269 feet near the northeast comer of the map. Field work was carried out between February and April, 1996. Access to the area is good. The Bush Highway, Power Road,...
Tags: Arizona,
geologic map
The Ninetysix Hills of Pinal County, Arizona, consist of a series of low hills and pediment situated about half way between the towns of Florence and Catalina, and are about 70 km ( 45 mi.) north of Tucson (see figure 1). The low spine of hills is underlain by at least four separate granitic plutons. The older pluton, a coarse-grained K-feldspar megacrystic granite exposed in the south, is intruded by a medium-grained granite to granodiorite. Both of these units are locally foliated, but have mineralogic and textural characteristics that suggest they do not belong to the regional suite of 1.65 to 1. 7 Ga-old granites, but are younger. The quartz-porphyritic Teacup granodiorite (Krieger, 1974a, 1974b, Bradfish, 1979)...
Tags: Arizona,
geologic map
The Ninetysix Hills of Pinal County, Arizona, consist of a series of low hills and pediment situated about half way between the towns of Florence and Catalina, and are about 70 km ( 45 mi.) north of Tucson (see figure 1). The low spine of hills is underlain by at least four separate granitic plutons. The older pluton, a coarse-grained K-feldspar megacrystic granite exposed in the south, is intruded by a medium-grained granite to granodiorite. Both of these units are locally foliated, but have mineralogic and textural characteristics that suggest they do not belong to the regional suite of 1.65 to 1. 7 Ga-old granites, but are younger. The quartz-porphyritic Teacup granodiorite (Krieger, 1974a, 1974b, Bradfish, 1979)...
Tags: Arizona,
geologic map
Surficial geologic maps of the Eloy South Quadrangle of the Picacho Basin. The Picacho basin is a large and complex graben surrounded by horsts and half-horsts, which are now the Picacho, Casa Grande, Silverbell, and Sacaton mountains. It formed mainly in response to late Miocene extension. Internal drainage probably persisted until about 3 million years ago. Several thousand meters of sediments fill the basin; 2000 m of evaporites and claystone form the bulk of the basin fill (Scarborough and Pierce, 1978). The upper 200 meters or so of basin fill was deposited by a gradually aggrading, regionally integrated drainage system. Young alluvium of the Santa Cruz River is up to 30 m thick and is found within 3.2 km of...
The study area is situated along the southern edge of the Superstition Mountains approximately 40 miles east of the greater Phoenix metropolitan area (Figure 1). Geology is dominated by mid-Tertiary volcanic rocks of the Superior volcanic field (Ransome, 1903), and these rocks depostionally overlie a crystalline basement of early Proterozoic Pinal Schist intruded by middle Proterozoic granitoids. In some areas a relatively thin sequence of the Middle Proterozoic Apache Group occurs along the contact between these two rock types. The volcanic stratigraphy of the southern Superstition Mountains changes abruptly from a sequence dominated by lavas on the south, in the Whitlow Canyon Area, to a sequence dominated by...
Tags: geologic map
The Goldfield Quadrangle and Superstition Mountains are located about 40 km due east ofPhoenix, Arizona, and a few miles east of Apache Junction, and include part of the Superstition Wilderness Area (Figure 1). Aerially extensive exposures of welded tuff form steep, rugged cliffs in the Superstition Mountains and overlie tilted felsic and mafic volcanic rocks, pre-volcanic conglomerate, and Precambrian granite and Pinal Schist. This study was carried out concurrently with mapping in the Florence Junction Quadrangle and the southern part of the Weaver's Needle Quadrangle. Mapping in the Goldfield Quadrangle continued from January through April, 1995.
Tags: Arizona,
geologic map
The geology of the Mormon Flat Dam Quadrangle is dominated by a thick succession of Miocene volcanic rocks, and by the consequences of two important structural events: 1)formation of the Superstition Cauldron at approximately 18.6 M a (McIntosh, personalcommunication, Ferguson and others, in preparation), and 2) regional extension which wasactive for a short period of time directly before, during, and after eruption of the Apache LeapTuff. The Tertiary stratigraphy consists of three broadly defined sequences: 1) pre-cauldronlavas, 2) syn-cauldron units - chiefly Apache Leap Tuff, and 3) post-cauldron lavas, intrusionsand volcaniclastic sedimentary rocks.Regional extensional tectonism was active over a broad area...
Tags: Arizona,
geologic map
The Picketpost Mountain and Iron Mountain 7.5' quadrangles are located east of the Phoenix metropolitan area and are within the Basin and Range physiographic and tectonic province of southwestern North America (Figure 1). Mapping represented on Plate 1 was done by the authors during the fall and winter of 1994-1995 or was derived from Peterson (1966) for Picketpost Mountain or from field sheets of the Quail Spring area provided by Steve Skotnicki and Charles Ferguson. Most map units are those used in adjacent USGS geologic maps (Peterson, 1960, 1969 ;Theodore and others, 1978; Creasey et aI., 1983; Peterson and Jinks, 1983).
Tags: geologic map
Geologic map of the Lincoln Ranch Basin, eastern Buckskin Mountains, western Arizona.
Tags: geologic map
The Greenback Creek 7 ½’ Quadrangle is located on the west flank of the Sierra Ancha and directly northeast of Theodore Roosevelt Lake (Figure 1). The geology is dominated by sedimentary rocks of the middle Proterozoic Apache Group and the middle Proterozoic diabase that commonly intrudes it (e.g. Bergquist et al., 1981; Wrucke, 1989). Early to middle Proterozoic granitic rocks are exposed beneath the Apache Group, primarily along the southwestern edge of the bedrock exposures in the map area. Tertiary conglomerate and local sandstone are deposited on the bedrock and in the flanking Tonto Basin, and have been subjected to only minor faulting and tilting. Upper Cenozoic sedimentary units and geomorphic surfaces were...
The Copper Mountain quadrangle is centered just north of the southwest-facing escarpment on the southwest side of the crest of the Sierra Ancha (see Figure 1). Elevations range from about 4200 feet in the southwest corner of the map to 6676 feet at Copper Mountain. The lower elevations in the southwest part of the map contain a mix of open Pinyon-Juniper forest and grassland and thick stands of oak mostly along the drainages. The Pinyon-Juniper gives way higher up to larger oak woodlands. The higher elevations up on the plateau are a mix of thick tangles of oak and manzanita and Ponderosa Pine conifer forest. The proliferation of dense brush in the higher elevations makes travel and mapping very difficult. This...
Tags: geologic map
The Ninetysix Hills of Pinal County, Arizona, consist of a series of low hills and pediment situated about half way between the towns of Florence and Catalina, and are about 70 km ( 45 mi.) north of Tucson (see figure 1). The low spine of hills is underlain by at least four separate granitic plutons. The older pluton, a coarse-grained K-feldspar megacrystic granite exposed in the south, is intruded by a medium-grained granite to granodiorite. Both of these units are locally foliated, but have mineralogic and textural characteristics that suggest they do not belong to the regional suite of 1.65 to 1. 7 Ga-old granites, but are younger. The quartz-porphyritic Teacup granodiorite (Krieger, 1974a, 1974b, Bradfish, 1979)...
Tags: Arizona,
geologic map
The study area includes the southern Roskruge Mountains and a small area of the northernmost Coyote Mountains in Pima County, southeast Arizona (Figure 1). Elevations in the area range between 2500' and 4300'. The area lies within the sonoran desert with large areas of relatively open desert punctuated by thick brushy zones along major washes. Bedrock geology was mapped by Charles Ferguson and Wyatt Gilbert during the winter and spring of 1999-2000, and the Quaternary geology was mapped by Thomas Biggs and Phil Pearthree in the spring and summer of 2000. Some areas within the boundary of the Tohono O'Odham Nation were mapped using remote techniques. Geologic Map of the Southern Roskruge Mountains (the San Pedro...
Tags: geologic map
The Tank Mountains lie along the eastern edge of a prominent negative Bouger gravity anomaly (Lysonski and others, 1980) that Grubensky and Bagby (1990) interpreted as evidence for a synvolcanic plutonic complex associated with Miocene silicic calderas of the southern Kofa Mountains, King Valley and northeastern Castle Dome Mountains. The crust which underlies the Miocene volcanic rocks of the Tank Mountains probably consists largely of early Proterozoic plutonic and high-grade metamorphic rocks. This area, along with most of southwestern Arizona was apparently stripped of its Paleozoic and possibly Middle and Upper Proterozoic sedimentary cover during Mesozoic uplift (Spencer and Reynolds, 1989). The study area...
Tags: Arizona,
geologic map
Windy Hill quadrangle is located in SE part of Tonto Basin and includes bedrock on both sides of the Basin. Bedrock geology is dominated by Middle Proterozoic Apache Group and by overlying lower Paleozoic sandstone and carbonate rocks.
Tags: geologic map
The New River Mesa Quadrangle is located along the northern fringe of the Phoenix metropolitan area. The quadrangle includes several high-standing mesas, and although the rugged terrain of the New River Mesa area is undeveloped, the area to the south is becoming increasingly urbanized and is undergoing rapid population growth. Geologic mapping was related to other previous and ongoing mapping projects of urban fringe areas located to the north and northeast of the Phoenix metropolitan area. A series of color 1 : 24,000-scale aerial photographs (dated 11-5-79 and 6-11-88) were obtained from the U. S. Department of Interior and the Tonto National Forest office in Phoenix, and these were used by the field geologists...
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