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184733 results.

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Page 6997, results 174901 - 174925

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Publication Extents

Not all publications have extents, not all extents are completely accurate
Thorium and rare earth minerals in the Powderhorn district, Gunnison County, Colorado
Jerry C. Olson, Stewart R. Wallace
1954, Trace Elements Investigations 353
Thorium has been found since 1949 in at least 33 deposits in an area 6 miles wide and 20 miles long in the Powderhorn district, Gunnison County, Colo. The district is composed largely of pre-Jurassic metamorphic and igneous rocks, which are chiefly if not entirely pre-Cambrian in age. The metamorphic...
The quality and character of Pacific Northwest waters
Herbert A. Swenson
1954, Report
This paper is a general discussion of the quality and chemical character of surface and ground waters in the Pacific Northwest as shown by the available data. Previous quality of water studies reported in the literature are reviewed. The composition of natural waters is considered as to the source and...
Germanium and uranium in coalified wood from Upper Devonian black shale
Irving A. Breger, James M. Schopf
1954, Trace Elements Investigations 496
Microscopic study of black, vitreous, carbonaceous material occurring in the Chattanooga shale in Tennessee and in the Cleveland member of the Ohio shale in Ohio has revealed coalified woody plant tissue. Some samples have shown sufficient detail to be identified with the genus Callixylon. Similar material has been reported in...
Radioactive deposits in California
George W. Walker, Tom G. Lovering
1954, Trace Elements Investigations 229
Reconnaissance examination by Government geologists of many areas, mine properties, and prospects in California during the period between 1948 and 1953 has confirmed the presence of radioactive materials in place at more than 40 localities. Abnormal radioactivity at these localities is due to concentrations of primary and secondary uranium minerals,...
Criteria for the mode of emplacement of the alkaline stock at Mount Monadnock, Vermont
Randolph W. Chapman
1954, Geological Society of America Bulletin (65) 97-114
The alkaline stock at Mount Monadnock, Vermont, described briefly by Wolff (1929), has been restudied in detail. Its petrography and structure are discussed here and conclusions are drawn as to its mode of emplacement. The stock consists of plutonic and hypabyssal rocks which intrude folded Ordovician (?) schist and quartzite. The longer axis, trending north-northwest across the strike of the country...
The occurrence of cobalt and nickel in the Silver Summit Mine, Coeur d'Alene district, Idaho
Verne Charles Fryklund Jr., Murl W. Hutchinson
1954, Economic Geology (49) 753-758
Cobalt and nickel of possible commercial interest have been discovered in the Silver Summit mine, Coeur d'Alene district, Idaho. Assay data indicate that an ore shoot contained about 0.40 percent cobalt and about 1.0 percent nickel in addition to the copper and rich silver ores. The cobalt-nickel mineral gersdorffite occurs...
The White Pine copper deposit, Ontonagon County, Michigan
Walter Stanley White, James C. Wright
1954, Economic Geology (49) 675-716
Copper, largely in the mineral chalcocite, is found in the lowermost beds of the Nonesuch shale over many square miles near White Pine, Ontonagon County, Mich. The Nonesuch shale, of late Keweenawan age, is about 600 feet thick and is composed largely of gray siltstone. It overlies 2,300 to 5,500...
Stratigraphy and history of the Moenkopi formation of Triassic age
Edwin D. McKee
1954, Memoir of the Geological Society of America (61)
The Moenkopi formation of Triassic age is composed of a series of deposits that form a wedge thinning eastward from a maximum of about 2000 feet in western Utah and southern Nevada to the vanishing point along an irregular margin in western Colorado, northeastern Arizona, and western New Mexico. Partly marine and partly continental in the...
Caribbean land and sea through the ages
Wendell Phillips Woodring
1954, Geological Society of America Bulletin (65) 719-732
The oldest part of the Caribbean region proper is in northern Central America, where Permian (?) and Lower Permian marine deposits rest on metamorphic rocks of unknown, possibly middle Paleozoic, age. According to present dating, geosynclinal deposition spread eastward in Late Jurassic time to include Cuba, farther eastward and southward...
Botanical prospecting for uranium on La Ventana Mesa, Sandoval County, New Mexico
H. Starrett, Helen L. Cannon
1954, Trace Elements Investigations 471
A botanical sampling program has been completed by the U.S. Geological Survey on La Ventana Mesa, Sandoval County, N. Mex. A uranium-bearing coal in the Allison-Gibson members of the Cretaceous Mesaverde formation crops out in erosional remnants of the mesa.The coal is capped by a well-fractured 65-foot sandstone bed through...