Technical Report Archive & Image Library (TRAIL) - 7 Matching Results

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Cambrian Through Mississippian Rocks of the Powder River Basin, Wyoming, Montana, and Adjacent Areas

Description: From abstract: This report describes Cambrian through Mississippian rocks in the Powder River Basin representing five depositional sequences that reflect both the biological evolution and the tectonic development of western North America.
Date: 1993
Creator: Macke, David L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Chronology of Late Cretaceous Igneous and Hydrothermal Events at the Golden Sunlight Gold-Silver Breccia Pipe, Southwestern Montana

Description: A report about gold mineralization at the Golden Sunlight breccia pipe, southwestern Montana, is related to emplacement of Late Cretaceous alkali-calcic rhyolite and subsequent collapse of the Belt Supergroup wallrock and rhyolite in the pipe.
Date: 1996
Creator: DeWitt, Ed; Foord, Eugene E.; Zartman, Robert E.; Pearson, Robert C. & Foster, Fess
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Gravity and Aeromagnetic Studies of the Powder River Basin and Surrounding Areas, Southeastern Montana, Northeastern Wyoming, and Western South Dakota

Description: From abstract: This report contains complete Bouguer anomaly, isostatic residual anomaly, and horizontal gradient anomaly gravity maps of the Powder River Basin and surrounding areas in southeastern Montana, northeastern Wyoming, and western South Dakota were compiled using gravity data from 21,528 stations. A total-intensity anomaly aeromagnetic map with 3 mile spaced east-west flight-lines is also presented. Also included is an analysis of these maps and data, focusing on gravity and aeromagn… more
Date: 1994
Creator: Robbins, Stephen L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Lance Formation: Petrography and Stratigraphy, Powder River Basin and Nearby Basins, Wyoming and Montana

Description: From abstract: The uppermost Cretaceous Lance Formation was studied in the Powder River Basin and nearby basins of Wyoming and Montana. The Lance Formation is overlain by the continental Paleocene Fort Union Formation. This report is a petrography and stratigraphy study on these basins.
Date: 1992
Creator: Connor, Carol Waite
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Mineral Resources of the Sleeping Giant Wilderness Study Area, Lewis and Clark County, Montana

Description: From abstract: A mineral resource survey was conducted in 1987 by the U.S. Geological Survey and the U.S. Bureau of Mines to evaluate mineral resources (known) and mineral resource potential (undiscovered) of the Sleeping Giant Wilderness Study Area (MT-075-111) in Lewis and Clark County, Montana. The only economic resource in the study area is an inferred 1.35-million-ton reserve of decorative stone (slate); a small gold placer resource is subeconomic. A high resource potential for decorative … more
Date: 1991
Creator: Tysdal, Russell G.; Reynolds, Mitchell W.; Carlson, Robert R.; Kleinkopf, M. D.; Rowan, L. C. & Peters, Thomas J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Sedimentology and Depositional History of the Lower Paleocene Tullock Member of the Fort Union Formation, Powder River Basin, Wyoming and Montana

Description: From abstract: This report is a study on the history of sedimentology and deposition of the lower Paleocene Tullock Member of the Fort Union Formation, Powder River Basin, Wyoming and Montana while looking at the geometry and sedimentary structures.
Date: 1993
Creator: Brown, Janet L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Shorter Contributions to the Stratigraphy and Geochronology of Upper Cretaceous Rocks in the Western Interior of the United States

Description: The following report presents measured sections and lithostratigraphic correlations of the units in the order to document a syntectonic unconformity in order to understand the tectonic history of the area.
Date: 1995
Creator: Geological Survey (U.S.)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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