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Effects of Urban Development on the Flood-Flow Characteristics of the Walnut Creek Basin, Des Moines Metropolitan Area, Iowa
Report discussing the probable impact of urban development on the magnitude and frequency of flooding in the lower reaches of the Walnut Creek basin. (from Abstract)
Date:
February 1978
Creator:
Lara, Oscar G.
Object Type:
Report
System:
The UNT Digital Library
The Eagle Valley Evaporite, Northwest Colorado--A Regional Synthesis
The following report presents a regional study of the extent, thickness, lithology, stratigraphic relations, age, depositional environment, and tectonic history of thick sulfate deposits and associated salts of sodium and potassium.
Date:
1971
Creator:
Mallory, William W.
Object Type:
Report
System:
The UNT Digital Library
Mineral Resources of the Glacier Primitive Area, Wyoming
The following report follows a mineral survey of the Glacier Primitive Area and adjoining area in Wyoming, that was made in 1968 and 1969.
Date:
1971
Creator:
Granger, H. C.; McKay, E. J.; Mattick, Robert E.; Patten, Lowell L. & McIlroy, Paul
Object Type:
Report
System:
The UNT Digital Library
Mineral Resources of the Laramie Peak Study Area, Albany and Converse Counties, Wyoming
The following report is an evaluation of the mineral potential of the Laramie Peak area, Wyoming.
Date:
1977
Creator:
Segerstrom, Kenneth & Weisner, Robert C.
Object Type:
Report
System:
The UNT Digital Library
The Columbia River Basalt Group in the Spokane Quadrangle, Washington, Idaho, and Montana
This report studies the several aspects of the basalts in the Columbia River Basalt Group in the Spokane quadrangle, Washington, Idaho, and Montana.
Date:
1976
Creator:
Griggs, Allan B. & Swanson, Donald A.
Object Type:
Report
System:
The UNT Digital Library
U.S. Geological Survey Investigations in Connection with the Mighty Epic Event, U12n.10 Tunnel, Nevada Test Site
The following report summarizes the investigations made following the Mighty Epic event beneath the surface of Rainier Mesa in U12n.10 tunnel at the Nevada Test Site.
Date:
December 1979
Creator:
Geological Survey (U.S.)
Object Type:
Report
System:
The UNT Digital Library
Duration of Hydrothermal Activity at Steamboat Springs, Nevada, From Ages of Spatially Associated Volcanic Rocks
Abstract: Steamboat Springs is a presently active equivalent of epithermal gold-silver ore-forming systems. Hot-spring sinter deposits contain small amounts of gold, silver, mercury, antimony, and arsenic. Hot-spring activity probably started before extrusion of the basaltic andesite of Steamboat Springs. Old sinter from the Steamboat Springs system occurs in gravels above and below the basaltic andesite. Intense hydrothermal alteration, including almost complete replacement by hydrothermal potassium-feldspar, has affected the basaltic andesite. Three plagioclase separates of differing potassium content from fresh basaltic andesite yielded potassium-argon ages of 2.52 to 2.55 m.y. Basaltic andesite almost completely replaced by potassium-feldspar yielded an age of 1.1 m.y. The source of energy for the thermal convection system is probably a large rhyolitic magma chamber that supplied the pumice and from which the rhyolite domes were emplaced. Sanidine and obsidian from four of the rhyolite domes yielded potassium-argon ages of 1.15 to 1.52 m.y. and obsidian from one of the northeastern domes yielded apparent ages of 2.97 and 3.03 m.y. The data indicate that hydrothermal activity has occurred at Steamboat Springs, possibly intermittently, for more than 2-1/2 m.y. These data agree with other radiogenic age studies indicating 1- and 2-m.y. lifetimes for the hydrothermal systems that generate …
Date:
1979
Creator:
Silberman, M. L.; White, D. E.; Keith, T. E. C. & Dockter, R. D.
Object Type:
Report
System:
The UNT Digital Library
Index of Generic Names of Fossil Plants, 1820-1965
An index of fossil names between 1820 and 1965. Diatoms, spores, and pollen are excluded from this index.
Date:
1970
Creator:
Andrews, Henry N.
Object Type:
Report
System:
The UNT Digital Library
Changes in Stratigraphic Nomenclature by the U.S. Geological Survey, 1975
The following document provides a list of publications about geology which relates to nomenclatural changes.
Date:
1976
Creator:
Cohee, George V. & Wright, Wilna B.
Object Type:
Report
System:
The UNT Digital Library
Nomenclature of Precambrian Rocks in Colorado
Abstract: "The Precambrian rocks of Colorado consist of a metaphoric complex more than 1,700 million years in age, three groups of igneous rocks about 1,700, 1,400, and 1,000 million years in age, here designated informal age groups, and two areally restricted units of sedimentary rocks, one between 1,400 and 1,700 million years in age and one between 950 and 1,400 million years. A systematic nomenclature for many of the rocks does not exist, but the present state of knowledge will permit establishment of a comprehensive nomenclature. Numerous formal names that have been applied to elements of the Precambrian assemblage are appraised and classified in a table, and eight names are abandoned."
Date:
1977
Creator:
Tweto, Ogden
Object Type:
Report
System:
The UNT Digital Library
Coal Resources of the United States
A report about the United States's coal supply. The U.S. has 25 percent of the world's identified coal resources and about 20 percent of the world's estimated total coal resources.
Date:
January 1, 1974
Creator:
Averitt, Paul
Object Type:
Report
System:
The UNT Digital Library
Selected Annotated Bibliography on the Geochemistry of Gold
A bibliography of about 200 selected references which contain information on source materials dealing with the genesis and geochemistry of gold and geochemical prospecting for gold deposits.
Date:
1971
Creator:
Cooper, Margaret
Object Type:
Report
System:
The UNT Digital Library
Mineralogy and Geochemistry of Some Belt Rocks, Montana and Idaho
A report which compares 20,000 feet of Belt rocks in the Mission Mountains Primitive Area in Montana with 40,000 feet of Belt rocks in the Pend Oreille area in Idaho and Montana.
Date:
1970
Creator:
Harrison, J. E. & Grimes, D. J.
Object Type:
Report
System:
The UNT Digital Library
Changes in Stratigraphic Nomenclature by the U.S. Geological Survey, 1973
A paper which provides a list of nomenclatural changes. The list also contains publications, the authors, and the names of the reports.
Date:
1975
Creator:
Cohee, George V. & Wright, Wilna R.
Object Type:
Report
System:
The UNT Digital Library
Stratigraphy of the State Bridge Formation in the Woody Creek Quadrangle, Pitkin and Eagle Counties, Colorado
A report about the lithologic units within a red-bed sequence that help to interpret the history and structure of the Woody Creek quadrangle, west-central Colorado.
Date:
1971
Creator:
Freeman, Val I.
Object Type:
Report
System:
The UNT Digital Library
Clinoptilolite of Possible Economic Value in Sedimentary Deposits of the Conterminous United States
A report about clinoptilolite. It is a common zeolite, it is potentially valuable for many industrial and agricultural processes, and it might be useful in controlling water pollution by removing ammonia from wastewater.
Date:
1971
Creator:
Sheppard, Richard A.
Object Type:
Report
System:
The UNT Digital Library
A Manual on Fire Assaying and Determination of the Noble Metals in Geological Materials
A report that provides details about fire assaying techniques to separate and concentrate the noble metals from many varieties of samples.
Date:
1977
Creator:
Haffty, Joseph; Riley, L. B. & Goss, W. D.
Object Type:
Report
System:
The UNT Digital Library
New Cretaceous Formations in the Western Wyoming Thrust Belt
A report about six cretaceous rock formations in the western Wyoming thrust belt.
Date:
1973
Creator:
Rubey, William W.
Object Type:
Report
System:
The UNT Digital Library
Stewart Gulch Tongue—A New Tongue of the Eocene Green River Formation, Piceance Creek Basin, Colorado
A report about mapping in the northern and central parts of the Piceance Creek basin of northwestern Colorado where several relatively thin dominantly marlstone units tongue northward into the Eocene Uinta Formation.
Date:
1977
Creator:
Hail, William J., Jr.
Object Type:
Report
System:
The UNT Digital Library
Coughs Creek Tongue--A New Tongue of the Eocene Green River Formation, Piceance Creek Basin, Colorado
A report about the Coughs Creek Tongue which is a sequence of light-gray marlstone, locally containing beds of sandstone and siltstone, in the upper part of the Green River Formation.
Date:
1975
Creator:
O'Sullivan, Robert B.
Object Type:
Report
System:
The UNT Digital Library
Changes in Stratigraphic Nomenclature by the U.S. Geological Survey, 1974
A list of stratigraphic names adopted, revised, reinstated, and abandoned. The nomenclatural changes pertain to geology.
Date:
1975
Creator:
Cohee, George V. & Wright, Wilna B.
Object Type:
Report
System:
The UNT Digital Library
Index of Generic Names of Fossil Plants 1966-1973
An index of names of new fossil plant genera found in literature between 1966 and 1973 which is now included in the pendium Index of Paleobotany.
Date:
1975
Creator:
Blazer, Anna M.
Object Type:
Report
System:
The UNT Digital Library
Changes in Stratigraphic Nomenclature by the U.S. Geological Survey, 1972
A list of stratigraphic names which are adopted, revised, reinstated, or abandoned are listed. The scheme of the list has been devised simply to facilitate depiction and analyses of the Precambrain history of the United States.
Date:
1974
Creator:
Cohee, George V. & Wright, Wilna B.
Object Type:
Report
System:
The UNT Digital Library
Bibliography and Index of U.S. Geological Survey Publications Relating to Coal, 1882-1970
A bibliography that lists about 1,300 U.S. Geological Survey publications related to coal and published prior to January 1, 1971.
Date:
1972
Creator:
Averitt, Paul & Lopez, Lorreda
Object Type:
Report
System:
The UNT Digital Library