Filters: partyWithName: Haley Snellen, Arizona Geological Survey, GIS (X)
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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...
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 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 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 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
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
Surficial geologic maps of the Eloy North 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...
Surficial geologic map of the Picacho Reservoir 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...
Surficial geologic map of the Casa Grande Mountains 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...
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 the north are the Tank Mountains, which form a continuous belt of bedrock westward into the Kofa Mountains. To the west lies Neversweat Ridge, which is the eastern-most known exposure of Orocopia Schist. To the east and northeast is the Palomas Plain, and to the south is the Gila River. Accessibility to the range is generally good. Most of the dirt roads are in good condition and can be partially traversed by a two-wheel drive vehicle. However, because they cross many sandy washes the roads are only passable with a four-wheel...
Tags: Arizona. geologic map
The Humboldt Mountain Quadrangle is located at the north edge of the Phoenix metropolitan area northeast of and adjacent to the town of Cave Creek, Arizona. The quadrangle straddles the hydrographic divide between the New River and Verde River basins. The quadrangle includes the upper Cave Creek drainage in the New River drainage basin, and the upper Camp Creek, lower Lime Creek, and upper Willow Springs Creek portions of the Verde River drainage basin. Geologic mapping of the Humboldt Mountain Quadrangle is one of a series of geologic maps covering the northeastern part of the Phoenix metropolitan area (Ferguson and others, 1998a, b; Leighty and others, 1997; Skotnicki, 1996a, b; and Skotnicki and others, 1997).
Tags: geologic map
This study encompasses the whole of the Oracle Junction 7.5' quadrangle and the eastern third of the Tortolita Mountains 7.5' quadrangle (see figure 1). Late Tertiary basin-fill deposits and younger Quaternary surficial deposits dominate most of the region and are well-exposed along the length of Oro Valley. The western third or so is underlain by a broad, flat pediment on the east side of the Tortolita Mountains. The pediment was etched into Proterozoic and Tertiary granitic rocks and is punctuated by more resistant hills of Pinal Schist and an east-northeast-trending band of younger metasedimentary rocks. Middle and Late Pleistocene sandstones and conglomerates lap up onto the pediment. These deposits contain...
Tags: Arizona,
geologic map
The Oracle 7.5' Quadrangle is located approximately 40 km north-northeast of downtown Tucson, and is on the northwest flank of Santa Catalina Mountains (Figure 1). The quadrangle encompasses the northwestern comer of the range, some of the flanking pediment around the town of Oracle, and alluvium in northeastern Oro Valley. The area was mapped during October 1999 to April 2000 as part of a multiyear mapping program directed at producing complete geologic map coverage for the Phoenix-Tucson metropolitan corridor. A 1 :24,000 scale map is the primary product of this study (Plate 1). This map incorporates past mapping by other workers as well new mapping by the authors (Figure 2). The accompanying report describes...
Tags: Arizona,
geologic map
The Samaniego Hills are a low series of hills composed of flat-lying to gentlydipping early Miocene and possibly late Oligocene lava flows interbedded with thin units of volcaniclastic and locally non-volcaniclastic sandstone and conglomerate. The preserved sequence is approximately 600 meters thick. The top is not preserved, but the base is well exposed along the southern edge of the hills, where it overlaps K-feldspar porphyritic granite of probable Middle Proterozoic age invaded by diabase dikes. The diabase occurs as vertical and subhorizontal dikes, and is probably associated with the Middle Proterozoic Apache Group, which overlies the granite sparingly along the southern edge of the map area. The granitic...
Tags: geologic map
The Picacho Mountains are north-south trending mountain range completely surrounded by Quaternary alluvium, and consists of Tertiary and older granitic and gneissic rocks (Figure 1). Picacho Peak, located south of the south end of the range, is also surrounded by alluvium, and consists of Tertiary andesitic volcanic rocks. Picacho Peak and the Picacho Mountains are separated by a gap of shallowly buried bedrock through which pass Interstate 10, the Southern Pacific Railroad, and the Central Arizona Project canal. The Picacho Mountains consists of a compositionally diverse suite of Tertiary, Cretaceous or Proterozoic granitoids, heterogeneous to gneissic granite, muscovite granite, schist, and gneiss, much of which...
Tags: geologic map
The Owl Head 7.5' quadrangle and the northern third of its southern neighbor, the Kofa Butte 7.5' quadrangle, represent an 80 mile' area of the northern Kofa Mountains, a remote, rugged range of southwest Arizona (Figure 1). The only part of the map area covered by significant amounts of Quaternary alluvium is an 8 mile' area in the northwest corner which is part of a narrow, Quaternary or younger Tertiary alluvial-filled valley that separates the Kofa Mountains from the New Water and Plomosa mountains to the north. Most of the bedrock exposures are Miocence calc-alkaline volcanic rocks of the Kofa volcanic field. They occur in three sequences: a series of outflow sheets of ash-flow tuffs that depositionally overly...
Tags: geologic map
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