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Page 5984, results 149576 - 149600

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Not all publications have extents, not all extents are completely accurate
Geology of the Three Forks quadrangle, Montana, with sections on petrography of igneous rocks
G. D. Robinson, Henry Frank Barnett
1963, Professional Paper 370
The Three Forks quadrangle at the head of the Missouri River, has a long stratigraphic succession. The oldest rocks are Precambrian gneiss, derived from arkosic sandstone, and amphibolite, probably altered from mafic sills and lava flows. The unmetamorphosed sedimentary rocks range in age from late Precambrian to Recent, have an...
Fossils from lower part of the Mancos Shale, Disappointment Valley, San Miguel County, Colorado
John B. Reeside, Daniel R. Shawe
1963, Open-File Report 64-143
About 400 fossiliferous segments of drill core from the lower part of the Mancos Shale of Late Cretaceous age were collected by the author during an exploratory drilling program for uranium deposits conducted in 1955 and 1956 by the Geological Survey in the Disappointment Valley area, San Miguel County, Colo. "The samples were submitted to...
Uranium in sediments
John Nicholas Rosholt
1963, Open-File Report 63-117
An oceanographic approach is used to study the distribution of abnormal occurrences of uranium in sediments. The occurrences predominate in marine phosphorites, black marine shales, and deposits in terrestrial-fluvial sandstones and ancient conglomerites. In early Paleozoic times, marine shales accounted for the majority of uranium deposition. By the beginning of...
Hydraulic geometry of a small tidal estuary
Robert M. Myrick, Luna Bergere Leopold
1963, Professional Paper 422-B
A tidal channel in a marsh bordering the Potomac River near Alexandria, Va., was mapped, and current-meter measurements of discharge were made at various locations and at various stages in the tidal cycle. These measurements allowed analysis of the change of width, depth, and velocity with discharge at various cross...
Investigations of the principal fluorspar districts of Mexico
Ralph Erskine Van Alstine, Samuel Estrada, Ernesto de la Garza
1963, Open-File Report 63-124
As a result of the increasing need for fluorspar, especially in North America, the Mexican fluorspar industry expanded greatly is the 8-year period, 1952-1960. Since 1956, Mexico has been the world's largest producer and exporter of this commodity. From 1956 through 1959 Maltice imported about 90 percent of the fluorspar...
Niobium and tantalum in the United States, exclusive of Alaska and Hawaii
Raymond Laurence Parker
1963, Mineral Investigations Resource Map 36
The accompanying map shows the location of the principal known deposits of niobium and tantalum minerals in the United States, exclusive of Alaska and Hawaii. Symbols of different shapes are used to depict deposits of different geologic types, and large symbols denote deposits with a record of production. Small symbols...
An exploration possibility at the Arizona mine, Pershing County, Nevada
R. E. Wallace, Donald Bruce Tatlock
1963, Open-File Report 63-130
At the Arizona mine in Pershing County, Nevada, a block of ground that may contain significant bodies of silver ore at a shallow depth .appears to have been very inadequately explored during early mining activity. The block approximates in arcal extent...