A report about uranium-bearing coal which underlies approximately 300 square miles of the Red Desert in the east-central part of the Great Divide Basin.

From introduction: Descriptive data for the Ul2k tunnel system are summarized in table 1. The U12k and U12k.01 tunnels were driven in predominantly air-fall tuffs of the Grouse Canyon and Survey Butte Members of the Oak Spring Formation of- Miocene(?) or younger age. The base of the Grouse Canyon Member is exposed in the road cut 500 to 700 feet east of, and at the same approximate elevation as, the portal U12k tunnel. The contact of the Grouse Canyon Member with the younger Survey Butte Member is at.5+63R and 5+56L in Ul2k.O1L (Personnel tunnel) and at 7+08R and 7+03L in U12k.O1R (Line of sight tunnel). A total of 165 feet of tuff of the Grouse Canyon Member is exposed in and near the tunnel, but only 74 feet of the Survey Butte Member is exposed in the U12k tunnel system.

From introduction: USGS is appraising the possibility, however slight, that the ground water beneath the Nevada Test Site, possibly contaminated by nuclear detonations, may carry radioactive fission products to places where they may constitute a public hazard.

From introduction: This report on the geology of the Powder River Basin is one of a series of reports by the Geological Survey on sedimentary basins in the United States.

An index and geological map of Nevada showing the Yucca Flat quadrangle.

An index and geological map of Nevada's Plutonium Valley quadrangle in Nye and Lincoln Counties, Nevada

From introduction: The gravity survey of the Nevada Test Site and contiguous areas of southern Nevada and southeastern California has been made by the U.S. Geological Survey on behalf of the U.S. Atomic Energy Commission. The objective of this study is to delineate and interpret gravity anomalies and regional trends so that the configuration and depth of the buried erosional surface of the Paleozoic rocks may be determined.

Description and outline of the geology of the U12j and U12j.01 tunnels in the Survey Butte Member of the Piapi Canyon Formation in Nevada.

From abstract: The U.S. Atomic Energy Commission, through the Office of Test Operations, Albuquerque Operations Office, plans to detonate a nuclear device in a massive salt bed 1,200 feet beneath the land surface. The project, known as Project Gnome, is an element of the Plowshare program--a study of peacetime applications of nuclear fission. The location of the proposed underground shot is in a sparsely-populated area in southeastern Eddy County, N. Mex., east of the Pecos River and about 25 miles southeast of the city of Carlsbad.

Introduction: The U.S. Geological Survey is appraising the possibility, however slight, that the ground water beneath the Nevada Test Site, possibly contaminated by nuclear detonations, may carry radioactive fission products to places where they may constitute a public hazard.

From introduction: The geologic studies in the Ul2e.03a and Ul2e.03b tunnels were conducted as part of the Geological Survey's investigations for the Vela Uniform program, Project Shade, and were completed for the purpose of 1) determining the preshot lithologic, structural, and chemical and physical properties of the tuffs exposed in the tunnels for comparison wits postshot geologic data, and 2) evaluating these data in order to predict the geologic effects of the planned nuclear explosion at tie end of the tunnels.

Abstract: Geophysical logs, a summary of contract costs, detailed descriptions of drilling, casing, cementing, and hydraulic testing operations, X-ray mineralogical analyses, physical property analyses, and a detailed lithologic log are presented in the report.

From introduction: This report evaluates four possible types of subsurface reservoirs for radioactive wastes in the Williston basin.

From introduction: The geologic studies in the U12b.08 tunnel were conducted by the U. S. Geological Survey on behalf of the U. S. Atomic Energy Commission for the purpose of determining the pre-explosion chemical and physical properties of the tuffs exposed in the tunnel. These data will be used in evaluating the geologic effects of the explosion by comparison with similar post-shot geologic data.

From introduction: Under the general supervision of the Health Division of the Los Alamos Scientific Laboratory, the U.S. Geological Survey is participating in geologic and hydrologic studies of the tile field constructed in Jackass Flats in the southwestern part of the Nevada Test Site as related to waste disposal, M. D. Shutler rendered valuable assistance in obtaining and evaluating portions of the data in this report. These investigations were done on behalf of the U.S. Atomic Energy Commission and were supported by the Division of Reactor Development and by the Albuquerque Operations Office.

Abstract: As a part of continuous geologic and geophysical investigations at the Nevada Test Site, gamma-radioactivity measurements are being made in tunnels and drill holes to determine semiquantitatively the natural gamma radioactivity of geologic formations and the distribution of nuclear-explosion-produced radioisotopes.

From purpose of the report: A detailed office study of modern topographic and geologic maps and aerial photographs of Yampa Canyon and its environs in the Uinta Mountains.

From abstract: The northern Black Hills bentonite mining district includes parts of Crook County, Wyo., Carter County, Mont., and Butte County, S. Dak. Within this district, many beds of bentonite occur interspersed with sedimentary strata of Cretaceous age that have an average total thickness of about 3,000 feet and consist chiefly of marine shale, marl, and argillaceous sandstone. The bentonite beds occur in formations ranging upward from the Newcastle sandstone to the lower part of the Mitten black shale member of the Pierre shale. Tertiary (?) and Quaternary deposits of gravel, sand, and silt are present on extensive terraces, and deposits of such materials also extend along stream courses in all parts of the district.

From introduction: This report contains the preliminary results of the USGS investigations of the geology of the U12b.07 tunnel and shaft, and the U12b.09 tunnel at the Nevada Test Site.

From introduction: This report details Vela Uniform program survey that determined the pre-explosion chemical and physical properties of the tuffs exposed in the tunnel for comparison with similar post-shot geologic data and evaluated these data in terms of predicting the geologic effects of the planned explosion.

From introduction: The geologic studies in the U12e.04 tunnel within the Nevada Test Site were conducted for the purpose of determining the structure and chemical and physical properties of the tuffs exposed in the tunnel.

From introduction: This report is intended as a descriptive summary. The fieldwork on which it is based was completed in the central Western States in 1952-56, and additional studies were made in the Central and Eastern States before and after the western studies. Research and compilation were completed in 1956-59. Other reports will describe in detail the geology and origin of the oxidized zinc deposits in Colorado, Utah, Nevada, and California. (See also Heyl and Bozion, 1960.)

The following report presents tables critically chosen for the "best values" for the density and molar volume of selected mineral compounds. The intent to the selection was not to be inclusive, but to present data for chemically and physically well-defined phases for which the molar volume and/or density was known to the order of 0.2 percent.

The following report presents a summary of thermochemical data of minerals collected by various contributors.