40Ar/39Ar Age Spectra and Total-Fusion Ages of Tektites from Cretaceous-Tertiary Boundary Sedimentary Rocks in the Beloc Formation, Haiti (open access)

40Ar/39Ar Age Spectra and Total-Fusion Ages of Tektites from Cretaceous-Tertiary Boundary Sedimentary Rocks in the Beloc Formation, Haiti

A report about Haitian tektites at the paleontological K-T boundary along with an Ir abundance anomaly and shocked quartz.
Date: 1993
Creator: Dalrymple, G. Brent; Izett, Glen A.; Snee, Lawrence W. & Obradovich, John D.
System: The UNT Digital Library
The Seaman Volcanic Center—A Rare Middle Tertiary Stratovolcano in Southern Nevada (open access)

The Seaman Volcanic Center—A Rare Middle Tertiary Stratovolcano in Southern Nevada

A report about the Seaman volcanic center which is a composite, middle Tertiary stratovolcano in southern Nevada.
Date: 1993
Creator: Du Bray, Edward A.
System: The UNT Digital Library
Comparison of the Cretaceous-Tertiary Boundary Impact Events and the 0.77-Ma Australasian Tektite Event: Relevance to Mass Extinction (open access)

Comparison of the Cretaceous-Tertiary Boundary Impact Events and the 0.77-Ma Australasian Tektite Event: Relevance to Mass Extinction

A report that discusses the interpretation of impact shock evidence found in the K-T boundary sections and discusses the constraints imposed by the Australasian tektites and microtektites on the role of the 180-km Chicxulub crater in mass extinction.
Date: 1993
Creator: Chao, E. C. T.
System: The UNT Digital Library
Hydrothermal Alteration in the Mount Hood Area, Oregon (open access)

Hydrothermal Alteration in the Mount Hood Area, Oregon

A report which describes the hydrothermal alteration of numerous outcrop samples collected in the vicinity of Mount Hood, as well as drill cuttings from 13 of the geothermal drill holes for which we were able to obtain sample splits.
Date: 1993
Creator: Bargar, Keith E.; Keith, Terry E. C. & Beeson, Melvin H.
System: The UNT Digital Library
Coastal Sedimentation Along a Segment of the Interior Seaway of North America, Upper Cretaceous Baxter Shale, and Blair and Rock Springs Formations, Rock Springs Uplift, Southwest Wyoming (open access)

Coastal Sedimentation Along a Segment of the Interior Seaway of North America, Upper Cretaceous Baxter Shale, and Blair and Rock Springs Formations, Rock Springs Uplift, Southwest Wyoming

A report which examines the sedimentary rocks deposited along a segment of the west coast of the interior seaway of North America in southwest Wyoming during the late Santonian and early Campanian subages of the Late Cretaceous Epoch.
Date: 1993
Creator: Roehler, Henry W.
System: The UNT Digital Library
Monitoring of Thermal Activity in Southwestern Yellowstone National Park and Vicinity, 1980-1993 (open access)

Monitoring of Thermal Activity in Southwestern Yellowstone National Park and Vicinity, 1980-1993

A paper about thermal activity in Yellowstone National Park. It assesses impacts of geothermal, oil, gas, and other types of development adjacent to the park. It also relates these changes to magma under the park.
Date: 1993
Creator: Friedman, Irving; Norton, Daniel R. & Hutchinson, Roderick A.
System: The UNT Digital Library
Submarine Landslides: Selected Studies in the U.S. Exclusive Economic Zone (open access)

Submarine Landslides: Selected Studies in the U.S. Exclusive Economic Zone

From the foreward: This report is meant to expand the knowledge behind what marine geologists call geohazards, submarine landslides.
Date: 1993
Creator: Schwab, William C.; Lee, Homa J. & Twichell, David C.
System: The UNT Digital Library
Stanford Canyon Quadrangle, Cochise County, Arizona: Analytic Data and Geologic Sample Catalog (open access)

Stanford Canyon Quadrangle, Cochise County, Arizona: Analytic Data and Geologic Sample Catalog

From abstract: Information in this report supplements the geologic map of the Stanford Canyon quadrangle that provides chemical data, thin sections, and hand specimens for each of the samples collected in the quadrangle.
Date: 1993
Creator: Du Bray, Edward A. & Pallister, John S.
System: The UNT Digital Library
Geologic Investigations of the 1986 Marryat Creek, Australia, Earthquake: Implications for Paleoseismicity in Stable Continental Regions (open access)

Geologic Investigations of the 1986 Marryat Creek, Australia, Earthquake: Implications for Paleoseismicity in Stable Continental Regions

A report regarding geologic investigations of the 1986 Marryat Creek, Australia, Earthquake, and implications for paleoseismicity in Stable Continental Regions.
Date: 1993
Creator: Machette, Michael N.; Crone, Anthony J. & Bowman, J. Roger
System: The UNT Digital Library
Surface Vitrinite Reflectance Study of the Uinta and Piceance Basins and Adjacent Areas, Eastern Utah and Western Colorado: Implications for the Development of Laramide Basins and Uplifts (open access)

Surface Vitrinite Reflectance Study of the Uinta and Piceance Basins and Adjacent Areas, Eastern Utah and Western Colorado: Implications for the Development of Laramide Basins and Uplifts

From abstract: A study of mean random vitrinite reflectance of surface and near-surface samples was conducted in western Colorado and eastern Utah in order to better understand the subsidence and thermal histories of the Laramide-age Uinta and Piceance basins and to estimate the the thickness of overburden removed from the two basins. The history of uplift on some of the adjacent Laramide uplifts were also studied.
Date: 1993
Creator: Johnson, Ronald Carl & Nuccio, Vito F.
System: The UNT Digital Library
Geometry and Structural Evolution of Gilsonite Dikes in the Eastern Uinta Basin, Utah (open access)

Geometry and Structural Evolution of Gilsonite Dikes in the Eastern Uinta Basin, Utah

From abstract: This report is an in-depth observation of the structural evolution of gilsonite dikes in the eastern Uinta basin of Utah.
Date: 1993
Creator: Verbeek, Earl R. & Grout, Marilyn A.
System: The UNT Digital Library
Structure and Stratigraphy of Upper Cretaceous and Paleogene Strata (North Horn Formation), Eastern San Pitch Mountains, Utah: Sedimentation at the Front of the Sevier Orogenic Belt (open access)

Structure and Stratigraphy of Upper Cretaceous and Paleogene Strata (North Horn Formation), Eastern San Pitch Mountains, Utah: Sedimentation at the Front of the Sevier Orogenic Belt

From abstract: This report describes the North Horn Formation in the eastern part of the San Pitch Mountains of Utah was deposited in nonmarine environments that included alluvial fans, varied fluvial and overbank settings, and lacustrine settings.
Date: 1993
Creator: Lawton, Timothy Frost; Hobbs, Robert S.; Talling, Peter J.; Trexler, James Hugh, Jr.; Weiss, Malcolm P. & Burbank, Douglas West
System: The UNT Digital Library
Stratigraphy, Structure, and Paleogeography of Pennsylvanian and Permian Rocks, San Juan Basin and Adjacent Areas, Utah, Colorado, Arizona, and New Mexico (open access)

Stratigraphy, Structure, and Paleogeography of Pennsylvanian and Permian Rocks, San Juan Basin and Adjacent Areas, Utah, Colorado, Arizona, and New Mexico

From introduction: The investigation described herein is a part of the USGS Evolution of Sedimentary Basins Program. This report concerns the Pennsylvanian and Permian stratigraphic framework, structural development, and paleogeography of the San Juan Basin.
Date: 1993
Creator: Huffman, A. Curtis, Jr. & Condon, Steven M.
System: The UNT Digital Library
Sedimentology and Depositional History of the Lower Paleocene Tullock Member of the Fort Union Formation, Powder River Basin, Wyoming and Montana (open access)

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

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.
System: The UNT Digital Library
Kinematics of the Aspen Grove Landslide, Ephraim Canyon, Central Utah (open access)

Kinematics of the Aspen Grove Landslide, Ephraim Canyon, Central Utah

From Abstract: This report describes the kinematics of the Aspen Grove landslide of Ephraim Canyon in central Utah that moved during the spring and summer months of 1983-86.
Date: 1993
Creator: Baum, Rex L.; Fleming, Robert W. & Johnson, Arvid M.
System: The UNT Digital Library
Cambrian Through Mississippian Rocks of the Powder River Basin, Wyoming, Montana, and Adjacent Areas (open access)

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

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.
System: The UNT Digital Library
Tertiary Stratigraphy of Highly Extended Terranes, California, Arizona, and Nevada (open access)

Tertiary Stratigraphy of Highly Extended Terranes, California, Arizona, and Nevada

Proceedings of a workshop held in February 1990 called "Tertiary Stratigraphy of Highly Extended Terranes, Southern Basin and Range" at the Desert Research Center of the California State University System, Soda Springs, near Baker, California. This volume is a collection of stratigraphic data and interpretation.
Date: 1993
Creator: Sherrod, David R. & Nielson, Jane E.
System: The UNT Digital Library
Advances Related to United States and International Mineral Resources: Developing Frameworks and Exploration Technologies (open access)

Advances Related to United States and International Mineral Resources: Developing Frameworks and Exploration Technologies

The following report provides information for the public good about the origin, quality, and quantity of mineral resources world-wide. This Bulletin reports progress on some of the current activities of the Office of Mineral Resources and reflects the necessity for an international perspective regarding mineral resources and research technology.
Date: 1993
Creator: Scott, Richard W., Jr.; Detra, Pamela S. & Berger, Byron R.
System: The UNT Digital Library