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R.A. Martin

Publications and source records attributed to R.A. Martin.

At least 19 recordsLinked to original sources
USGS1987

Aeromagnetic map of the Hells Gate Roadless Area, Gila County, Arizona

The Hells Gate Roadless Area comprises about 31, 200 acres in the northern part of the Tonto National Forest. It lies beneath the Mogollon Rim between the communities of Payson and Young. The area is roughly a 4 by 15 mi strip along the deeply incised segment of Tonto Creek and along a 2 mi segment of Haigler Creek at its intersection with Tonto Creek. Elevations range from 2,960 ft in the lower Tonto Creek gorge near Gisela, in the southeastern part of the area, to 6,200 ft in the Green Valley Hills, in the northern part of the area. Local relief in the deep canyon of Tonto Creek is commonly greater than 1,000 ft. Hells Gate is the geographic name for the canyon at the confluence of Tonto Creek and Haigler Creek. Foot trails cross Tonto Creek at Hells Gate and between Houston Pocket and McDonald Pocket. Descent into Tonto Creek elsewhere is extremely difficult. The Hells Gate area lies in the central part of the Tonto Basin, which consists of Tonto Creek and tributaries draining the Mogollon escarpment and the northern Sierra Ancha. These streams dissect a table land which is the unconformable surface at the base of the Paleozoic section and the Mogollon Rim. This tableland is a part of the Colorado Plateau margin, which has been slightly structurally disrupted by late Cenozoic faulting and from which most of the Middle Proterozoic and Paleozoic strata have been stripped by subsequent erosion. Early Proterozoic rocks constitute about ninety percent of the exposed rocks in the roadless area and are composed of granite, granophyre, and intrusive and extrusive rhyolite (Conway, 1983).

Arizona↗
USGS1986

Aeromagnetic map of the Wet Beaver Roadless Area, Yavapai and Coconino counties, Arizona

The Wet Beaver Roadless Area includes 9,890 acres (15.4 mi2) of the Coconino National Forest and is in T. 15 N., Rs. 6, 7, and 8 E., Yavapai and Coconino Counties, central Arizona. Camp Verde, the nearest major population center, is about 13 mi southwest of the road less area. The area boundary closely follows the rim of the steep-walled canyon cut by Wet Beaver Creek into the gently westward sloping surface of the Colorado Plateau. The mouth of the canyon and the western boundary of the roadless area are near the Mogollon Rim, an escarpment that marks the southwestern margin of the Colorado Plateau. Here, the plateau surface falls off sharply in the Verde Valley, and Wet Beaver Creek flows 12 mi farther west where it joins the Verde River, the master stream of the region. The maximum elevation within the area, just east of Hog Hill, is 6,470 ft. The lowest point, at 4,000 ft, is the stream bed of Wet Beaver Creek near the western area boundary. Topographic relief within the area ranges from 1,200 ft near the mouth of the canyon at Casner Butte to about 150 ft at the eastern boundary. Perennial springs, located south of Hog Hill, discharge about 1,200-1,500 gallons of water per minute into Wet Beaver Creek (Twenter and Metzger, 1963, p. 94). The western boundary of the roadless area and the mouth of Wet Beaver Creek canyon are accessible by Forest Service roads from either Camp Verde or the Sedona interchange on Interstate Highway 17. Various points along the canyon rim and the area boundary can be reached by unimproved roads, jeep trails, and pack trails. The canyon floor is accessible only on foot; in several places, deep pools require a swim or steep climb and descent for traverse of the canyon.

Arizona↗
USGS1986

Aeromagnetic map of the Rattlesnake Roadless Area, Coconino and Yavapai counties, Arizona

The Rattlesnake Road less Area covers 32,870 acres between long 11°37'30" and long 111°47'30" W. and between lat 34°40' and lat 34°45' N., Coconino and Yavapai Counties, in central Arizona. Sedona and 0ak Creek, the nearest population centers, are located, respectively, at the northwest corner and along the west boundary of the roadless area. The Rattlesnake Roadless Area includes the deeply embayed Mogollon Rim margin of the Colorado Plateau Province and part of the Werde Walley. The Werde Walley is a deeply dissected lacustrine basin, one of several tectonic basins in the Arizona transition zone that separate the Basin and Range Province from the Colorado Plateau Province. Here the plateau surface falls off abruptly to the Werde Valley, drained by the Werde River, the master stream of the region. The highest point in the roadless area is 6,834 ft at the basalt cap at the north end of Munds Mountain. The lowest point, about 3,480 ft, is along Dry Beaver Creek, near the southwest corner of the roadless area. The maximum relief, more than 2,000 ft, occurs between the Munds-Lee Mountain divide and the valley floors of bordering Oak Creek and Jacks Canyon. The relief between floor and upper canyon rims along the steep-walled and narrow Woods Canyon ranges from 900 ft to more than 1,400 ft; the east side of the canyon has the highest walls. Canyon rims in the roadless area are accessible by several four-wheel-drive trails across the plateau surface from points along Schnebly Hill Road and Highway I-17. Access to Jacks Canyon is by road and four-wheel-drive trail to Jacks Canyon Tank, about 4 mi up the canyon from Highway 179. Access to the head of Jacks Canyon is by foot or horse along a well-maintained trail. Access to the bottom of Woods Canyon is by four-wheel-drive vehicle for about 2 mi from Highway 179 and then by pack trail for about 5 mi more.

Arizona↗
USGS1986

Geophysical maps of the Winchester Roadless Area, Cochise County, Arizona

The Wilderness Act (Public Law 88-577, September 3, 1964) and related acts require the U.S. Geological Survey and the U.S. Bureau of Mines to survey certain areas on Federal lands to determine their mineral resource potential. Results must be made available to the public and be submitted to the President and the Congress. This report presents the results of a geophysical survey of the Winchester Roadless Area in the Coronado National Forest, Cochise County, Arizona. The Winchester Roadless Area (03122) was classified as a further planning area during the Second Roadless Area Review and Evaluation (RARE II) by the U.S. Forest Service, January 1979.

Arizona↗
USGS1983

Aeromagnetic map of the Powderhorn wilderness study area and Cannibal Plateau Roadless Area, Gunnison and Hinsdale counties, Colorado

The Powderhorn Wilderness Study Area (51,000 acres or 20,640 hectares) and the contiguous Cannibal Plateau Roadless Area (29,500 acres or 11,959 hectares) are on the Gunnison County-Hinsdale County boundary, approximately 50mi (80 km) southwest of Gunnison and a few miles east of Lake City, Colo. Part of the area has been known as the Powderhorn Primitive Area. The mineral resource potential of the study area has been assessed by the U.S. Geological Survey and the U.S. Bureau of Mines; this assessment involved, besides the geologic study and economic appraisal (Sharp and others, 1983), a geophysical survey (this report) by the Geological Survey, and a geochemical survey (Sharp and Lane, 1983) by the Geological Survey and the Bureau of Mines.

Colorado↗
USGS1982

Geophysical survey of the Centennial Mountains Wilderness Study Area and contiguous areas, Beaverhead County, Montana and Clark and Fremont counties, Idaho

Parts of both the Targhee and Beaverhead National Forests are within the study area. Four contiguous parcels of land, totaling about 96,176 acres (38,922 ha) make up the area. The first of these encompasses about 46,126 acres (18,667 ha), is wholly in Montana, and includes an addition by the Bureau of Land Management. The second area, in the Targhee National Forest, consists of some 38,750 acres (15,682 ha) within Idaho. The third and fourth parcels include about 11,300 acres (4,573 ha) in the Beaverhead..and Targhee National Forests that overlies the Mt. Jefferson and Sawtell Peak areas in the eastern part of the Centennial Mountains.

Idaho, Montana↗
USGS1982

Mineral resource potential map of the Hells Hole further planning area (RARE II), Greenlee County, Arizona, and Grant County, New Mexico

During 1979, the U.S. Geological Survey and the U.S. Bureau of Mines conducted field investigations to evaluate the mineral resource potential of the Hells Hole Further Planning Area. The investigations included geologic mapping, geophysical studies, geochemical sampling, and a survey of known mines, prospects, and mineralized areas. This report summarizes the results of those studies.

New Mexico, Arizona↗