From abstract: The Piceance basin of western Colorado contains large reserves of natural gas in low-permeability reservoirs of the Late Cretaceous-age Mesaverde Formation or Mesaverde Group. The gas accumulation can be divided into three general zones: a zone of surface-water invasion that extends inward a few miles from present outcrops, a gas-and-waterbearing zone that extends 10-20 miles inward from the water-bearing zone, and a central, predominantly gasbearing zone.

From abstract: This report concerns a comparison of detailed measured sections and geophysical well-log profiles through the Sego allows subsurface identification of both depositional cycles and lateral facies changes.

From abstract: Three closely spaced wells drilled through the Upper Cretaceous Mesaverde Group and were extensively cored and logged in order to identify the factors controlling the occurrence and distribution of gas in low-permeability rocks and to improve recovery technology.

From abstract: Analysis of vitrinite reflectance profiles and surfaces of equal vitrinite reflectance in the southeastern part of the Piceance basin, northwestern Colorado, indicates that burial histories for the Divide Creek anticline and the Grand Hogback are different from those for adjacent synclines. These two positive structures probably reached their present-day thermal maturity before late Eocene folding and before the end of the Laramide orogeny. In contrast, adjacent synclines did not reach their present-day thermal maturity until the end of the Laramide orogeny, or possibly later.

From abstract: This is a report on reconnaissance geologic mapping and isotopic dating of tuff beds in the Uinta Basin of Utah that show that Lake Uinta probably persisted into late Eocene time in the area east of Duchesne and Strawberry Reservoir.

From abstract: This report describes the depositional environments of the Chinle Formation that was deposited in a complex fluvial-deltaic-lacustrine system in the area of the present-day eastern San Juan basin and Chama basin. Lithofacies include conglomerate and planar- and trough-crossbedded sandstone; bentonitic mudstone and sandstone; black, organic carbon-rich mudstone; large-scale, trough crossstratified siltstone, sandstone, and mudstone; and thickbedded, bioturbated, fine-grained sandstone and siltstone.

From Abstract: This report describes landslides and debris flows occurred in bedrock and surficial deposits of Ephraim Canyon, on the west side of the Wasatch Plateau, in central Utah, during the spring of 1983.

Abstract: The Fish Springs Range Wilderness Study Area (UT-050-127) includes most of the Fish Springs Range and is located north of the House Range, about 50 miles northwest of the city of Delta, Utah. A mineral resource study of the 33,840-acre area was completed in 1987 by the U.S. Geological Survey and U.S. Bureau of Mines. The northwestern and southeastern parts of the wilderness study area contain inferred subeconomic resources of high-purity quartzite. No metallic mineral resources were identified in the study area, but more than 17 million pounds of lead, 2.6 million ounces of silver, and minor copper, zinc, and gold have been produced from the Fish Springs mining district, which is immediately outside the northwest boundary of the wilderness study area. The potential for undiscovered deposits of these metals and molybdenum is high near the northern end of the study area, adjacent to the mining district, moderate near the southern end, and low in the remainder of the area. The resource potential for undiscovered deposits of high-purity limestone and dolomite is moderate throughout the study area except where quartzite is present; potential for undiscovered low-temperature geothermal resources and for oil and gas is low throughout the study area.

From abstract: The Indian Creek (UT-060-164), Bridger Jack Mesa (UT-060-167), and Butler Wash (UT-060-169) Wilderness Study Areas are located in San Juan County, southeastern Utah. Inferred subeconomic resources of sandstone and sand and gravel exist within all three wilderness study areas, but because of their abundance throughout the region, their distance from current markets, and their lack of unique properties, these materials have no current likelihood for development.

From introduction: This report presents an evaluation of the mineral endowment (identified resources and mineral resource potential) of the study area and is the product of several separate studies by the U.S. Bureau of Mines (USBM) and the U.S. Geological Survey (USGS). Identified resources are classified according to a modification of the system described by McKelvey (1972) and the USBM and USGS (1980), which is shown in the Appendix. Identified resources are studied by the USBM. Mineral resource potential is the likelihood of occurrence of undiscovered metals and nonmetals, industrial rocks and minerals, and of undiscovered energy sources (coal, oil, gas, oil shale, tar, and geothermal sources). It is classified according to the system of Goudarzi (1984) and is shown in the Appendix. Undiscovered resources are studied by the USGS.

Abstract: The Bobcat Draw (WY-010-126) Wilderness Study Area includes about 17,150 acres and is located about 45 mi (miles) by road west of Worland in the Bighorn basin. The arid landscape comprises treeless uplands drained by intermittent streams. No identified resources are in the Bobcat Draw Wilderness Study Area. Most of the area is currently under lease for oil and gas. The study area has a high potential for resources of oil and gas and a high potential for subeconomic resources of deeply buried coal. The potential for a deep-seated geothermal energy resource is moderate. The resource potential for oil shale and metals, including uranium, is low.

From introduction: The objectives of this report are to (1) document the stratigraphic framework of the Santa Margarita Formation and part of the Monterey Shale in the southern Temblor Range, (2) interpret the environments of deposition and depositional processes of the above units, and (3) evaluate the influence of tectonism on Santa Margarita sedimentation, with special attention given to testing the hypothesis of Berry and others (1968).

Map showing the mineral resource potential and the geology of the Fiddler Butte Wilderness Study Area

This report follows the mineral resource study and findings of the Spring Creek Canyon Wilderness Study Area.

The following report analyzes the mineral resources of Swasey Mountain and Howell Peak.

The following report summarizes the mineral resource studies and findings of the Wah Wah Mountains Wilderness Study Area.

This report analyzes the Mancos Mesa Wilderness Study Area in San Juan County that contains low mineral resource potential for other metals, coal, and geothermal energy.

The following report summarizes the study and findings of mineral resources in Fish Creek Canyon, Road Canyon, and Mule Canyon.

The following report follows the geological and ground-water hydrology study of the Spirit Lake blockage in Mount St. Helens that took place after a rockslide-debris avalanche in May 18, 1980.