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Ancient Lavas in Shenandoah National Park Near Luray, Virginia
Abstract: In the Blue Ridge Province of northern Virginia, Maryland, and southern Pennsylvania, Lower Cambrian beds are underlain by a thick sequence of greenstone and interbedded sedimentary rocks known as the Catoctin Formation. An area near Luray, Va., was studied to determine the thickness of the formation, its relationship to overlying and underlying rocks, and the original nature of the lavas from which the Catoctin greenstone was derived. There the Catoctin Formation lies unconformably on granitic rocks. Its basal sedimentary layer ranges from a few inches to 150 feet in thickness and contains pebbles of underlying basement rocks. The erosion surface beneath the Catoctin is irregular, and in several places, hills as much as 1,000 feet high were buried beneath the Catoctin lavas. No important time break is indicated between the deposition of the Catoctin Formation and the overlying Cambrian sediments. The original Catoctin lavas were basaltic and were probably normal plateau basalts. Columnar joints, amygdules, sedimentary dikes, flow breccias, low-dipping primary joints, and other primary structures are well preserved.
Date:
1969
Creator:
Reed, John Calvin, Jr.
System:
The UNT Digital Library
Areal Geology of the Little Cone Quadrangle, Colorado
From abstract: The Little Cone quadrangle includes an area of about 59 square miles in eastern San Miguel County in southwestern Colorado. The quadrangle contains features characteristic of both the Colorado Plateaus physiographic province and the San Juan Mountains, and it has been affected by geologic events and processes of two different geologic environments.
Date:
1960
Creator:
Bush, Alfred Lerner; Marsh, Owen Thayer & Taylor, Richard B.
System:
The UNT Digital Library
Bentonite Deposits of the Northern Black Hills District Wyoming, Montana, and South Dakota
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.
Date:
1962
Creator:
Knechtel, Maxwell M. & Patterson, Sam H.
System:
The UNT Digital Library
Beryl-bearing Pegmatites in the Ruby Mountains and Other Areas in Nevada and Northwestern Arizona
From abstract: Pegmatite occurs widely in Nevada and northwestern Arizona, but little mining has been done for such pegmatite minerals as mica, feldspar, beryl, and lepidolite. Reconnaissance for beryl-bearing pegmatite in Nevada and in part of Mohave County, Ariz., and detailed studies in the Dawley Canyon area, Elko County, Nev., have shown that beryl occurs in at least 11 districts in the region. Muscovite has been prospected or mined in the Ruby and Virgin Mountains, Nev., and in Mohave County, Ariz. Feldspar has been mined in the southern part of the region near Kingman, Ariz., and in Clark County, Nev.
Date:
1960
Creator:
Olson, Jerry C. & Hinrichs, E. Neal
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
System:
The UNT Digital Library
Bibliography of the Geology and Hydrology of the Albuquerque Greater Urban Area, Bernalillo and Parts of Sandoval, Santa Fe, Socorro, Torrance, and Valencia Counties, New Mexico
A bibliography which contains over 500 references for the Albuquerque Greater Urban Area (AGUA). The intent is to be comprehensive in scope in the areas of hydrology and geology as well as introductory in other interdisciplinary areas.
Date:
1978
Creator:
Wright, Ann Finley
System:
The UNT Digital Library
Cenozoic Geology in the Mammoth Area Pinal County, Arizona
A report about the lower San Pedro Valley in Arizona. This report shows how mapping discrete units of the valley may lead to a broadened understanding of Cenozoic history of intermontane basins in Arizona.
Date:
1963
Creator:
Heindl, L. A.
System:
The UNT Digital Library
Cenozoic Geology in the Mammoth Area Pinal County, Arizona
From introduction: "The purpose of this report is to show how mapping of discrete units of the valley fill may lead to a broadened understanding of Cenozoic history of intermontane basins in Arizona. The area described is in the vicinity of Mammoth Arizona where deep dissection has exposed a complex sequence of terrestrial deposits and related rocks."
Date:
1963
Creator:
Heindl, L. A.
System:
The UNT Digital Library
Changes in Stratigraphic Nomenclature by the U.S. Geological Survey, 1963
A report that fits in a series of reports that are about changes in stratigraphic nomenclature and that will list publications in which the changes have been describes. It deals with stratigraphy, including those defining changes in stratigraphic nomenclature in reports of the U.S. Geological Survey.
Date:
1965
Creator:
Cohee, George V. & West, Walter S.
System:
The UNT Digital Library
Changes in Stratigraphic Nomenclature by the U.S. Geological Survey, 1969
A report about the stratigraphic nomenclature changes in geology.
Date:
1970
Creator:
Cohee, George V.; Bates, Robert G. & Wright, Wilna B.
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.
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.
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.
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.
System:
The UNT Digital Library
Chromite and Other Mineral Deposits in Serpentine Rocks of the Piedmont Upland, Maryland, Pennsylvania and Delaware
From abstract: The Piedmont Upland in Maryland, Pennsylvania, and Delaware is about 160 miles long and at the most 50 miles wide. Rocks that underlie the province are the Baltimore gneiss of Precambrian age and quartzite, gneiss, schist, marble, phyllite, and greenstone, which make up the Glenarm series of early Paleozoic(?) age. These are intruded by granitic, gabbroic, and ultramafic igneous rocks. Most of the ultramafic rocks, originally peridotite, pyroxenite, and dunite, have been partly or completely altered to serpentine and talc; they are all designated by the general term serpentine. The bodies of serpentine are commonly elongate and conformable with the enclosing rocks.
Date:
1960
Creator:
Pearre, Nancy C. & Heyl, Allen V., Jr.
System:
The UNT Digital Library
Chromite Deposits in Central Part Stillwater Complex, Sweet Grass County, Montana
From abstract: The chromite deposits of the central part of the Stillwater complex lie in a belt 9 miles long between the valleys of Boulder River and the West Fork of the Stillwater River in Sweet Grass County, Mont. The chromite occurs as layers near the middle part of the ultramafic zone in the lower part of the complex. The layers, originally horizontal, have been tilted so that they dip northeastwards at angles ranging from nearly horizontal to nearly vertical, and are cut by many cross faults, the largest with a horizontal offset of 3,000 feet. Investigations by the United States Geological Survey and the United States Bureau of Mines have shown that in this belt there are 5 sections ranging in length from 850 to 3,800 feet along the strike where the continuity and grade of the chromite can be reasonably inferred.
Date:
1955
Creator:
Howland, A. L.
System:
The UNT Digital Library
Chromite Deposits in the Seiad Valley and Scott Bar Quadrangles, Siskiyou County, California
A report about chromite deposits in the Seiad Creek and McGuffy Creek districts and the Ladd mine, Siskiyou County, California, that occur in dunite-peridotite bodies that are part of an ophiolitic sequence in the western Paleozoic and Triassic belt of the Klamath Mountains.
Date:
1981
Creator:
Cornwall, Henry R.
System:
The UNT Digital Library
The Climax Molybdenum Deposit, Colorado
From abstract: The largest single metal-mining operation in the history of mining in Colorado has been developed at Climax, as a result of the increased use of molybdenum in the steel and other industries. Production of molybdenum at Climax was notable for a short period during the World War; it ceased from April 1919 to August 1924 but since then has shown a steady increase. In 1930 from 1,000 to 1,200 tons of ore was milled daily, using only one unit of the 2,000-ton mill. The mine has a reserve of broken ore sufficient to furnish 2,000 tons daily for 3 years and is being developed to continue to furnish this and a still further increased output as the use of the metal may warrant.
Date:
1933
Creator:
Butler, B. S. & Vanderwilt, J. W.
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.
System:
The UNT Digital Library
Coal Geology of the White Oak Quadrangle, Magoffin and Morgan Counties, Kentucky
From abstract: The White Oak quadrangle lies near the western edge of the eastern Kentucky coalfield and includes approximately 59 square miles of parts of Magoffin and Morgan Counties, Ky. The outcropping rocks are equivalent to most of the Breathitt formation of Pennsylvanian age. The regional southeast dip of the rocks is interrupted by the Irvine-Paint Creek fault, the Caney anticline, the Grape Creek syncline, and the Johnson Creek fault.
Date:
1957
Creator:
Adkison, W. L.
System:
The UNT Digital Library
Coal Resources of Lawrence County Pennsylvania
A report about the coal-bearing rocks found in Lawrence County, Pennsylvania. Lawrence County is in west-Central Pennsylvania in the northern part of the Appalachian coal field.
Date:
1964
Creator:
Van Lieu, J. A. & Patterson, Elmer D.
System:
The UNT Digital Library
Coal Resources of Lawrence County, Pennsylvania
This report records the distribution, thickness, and reserves of coal in Lawrence County, Pennsylvania.
Date:
1964
Creator:
Van Lieu, J. A. & Patterson, E. D.
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
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.
System:
The UNT Digital Library