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Page 6057, results 151401 - 151425

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Publication Extents

Not all publications have extents, not all extents are completely accurate
Geological significance of lead-alpha and isotopic age determinations of "alkalic" rocks of New England
Priestley Toulmin III
1961, Geological Society of America Bulletin (72) 775-779
Recent age determinations indicate that at least two groups of "alkalic" igneous rocks exist in New England, with ages of about 185 and 270 million years. Because of their lithologic and geologic similarities, all these rocks had previously been grouped with the White Mountains plutonic-volcanic series of New Hampshire. Until reliable petrographic or...
An aeromagnetic profile from anchorage to Nome, Alaska
E. R. King
1961, Geophysics (26) 716-726
A total-intensity profile was obtained on a 500-mile flight by a U. S. Geological Survey airplane from Anchorage to Nome, Alaska, on May 4, 1954. The average flight altitude was 6,000 ft above sea level except over the Alaska Range where the flight altitude was 9,000 ft. This profile crossed eight of the major...
Origin and development of the Three Forks Basin, Montana
G. D. Robinson
1961, Bulletin of the Geological Society of America (72) 1303-1313
The Three Forks Basin sprawls where the intricately deformed sedimentary and volcanic rocks of the Disturbed Belt along the Rocky Mountain front are faulted against the Precambrian metamorphic rocks that make the core of the Tobacco Root, Madison, Gallatin, and Beartooth ranges. Its eastern edge is linear, controlled by steep faults...
Recent chemical analyses of waters from several closed-basin lakes and their tributaries in the western United States
H.C. Whitehead, J. H. Feth
1961, Geological Society of America Bulletin (72) 1421-1425
Some of the classic closed-basin lakes of the western United States have been resampled, and the waters have been analyzed by modern wet-chemical methods. Included are waters from Borax and Little Borax lakes and Mono Lake in California; Big Soda, Pyramid, and Walker Lakes in Nevada; Abert Lake, Oregon; and...
Origin of the Gulf of California
Warren Hamilton
1961, Bulletin of the Geological Society of America (72) 1307-1318
The probable cumulative Late Cretaceous and Cenozoic right-lateral strike-slip displacement along the San Andreas fault in central California is 350 miles. The San Andreas and the allied faults into which it branches southward trend longitudinally into the Gulf of California, and the seismicity of the region indicates that the fault system follows...
Patterns and origin of radial dike swarms associated with West Spanish Peak and Dike Mountain, south-central Colorado
Ross B. Johnson
1961, Bulletin of the Geological Society of America (72) 579-589
West Spanish Peak and Dike Mountain in south-central Colorado are stocks which cut Tertiary sedimentary rocks near the axis of the La Veta syncline, the structural trough of the Raton basin. Associated with these stocks are radial dike swarms. The outline of the West Spanish Peak dike swarm is elliptical. The Dike Mountain swarm is...
Local evidence of Pleistocene to recent orogeny in the Argentine Andes
Walden P. Pratt
1961, Bulletin of the Geological Society of America (72) 1539-1550
Deformed continental sedimentary rocks are exposed in the province of Salta, northwestern Argentina, in one of many intermontane basins of the Puna, a high desert region of subparallel north-trending block-fault ranges. These rocks, formerly thought to be Tertiary but recently dated by fossil diatoms as Pleistocene or younger, comprise several thousand feet of...
Uranium migration and geochemistry of uranium deposits in sandstone above, at, and below the water table; Part 2, Relationship of uranium migration dates, geology, and chemistry of the uranium deposits
C. S. Robinson, John Nicholas Rosholt Jr.
1961, Economic Geology (56) 1404-1420
The time of U migration in deposits in sandstone can be determined by correlating apparent age calculations, based on radiochemical analyses, with the geology of a particular deposit. Data were obtained from U ore samples representing deposits above the water table, deposits just above and below perched water tables, and...
Uranium migration and geochemistry of uranium deposits in sandstone above, at, and below the water table; Part 1, Calculation of apparent dates of uranium migration in deposits above and at the water table
John Nicholas Rosholt Jr.
1961, Economic Geology (56) 1392-1403
The migration of U may be studied by the distribution of the radioactive daughter products, which serve as natural tracers in the migration of U. The distribution of the daughter products is determined by radiochemical analyses of samples from ore deposits in sandstone, and the apparent minimum and maximum dates...
Origin of a salt-water lens in permafrost at Kotzebue, Alaska
D.J. Cedarstrom
1961, Bulletin of the Geological Society of America (72) 1427-1431
Frozen sediments were found to a depth of 238 feet in the drilling of a 325-foot well at Kotzebue, Alaska. Between 79 and 86 feet, however, highly saline water was found in a gravel lens. The writer suggests that the salt water originated by fractionation by freezing. Analyses of this water and of slightly saline...
Late quaternary history of the snake river in the American Falls region, Idaho
Donald E. Trimble, Wilfred James Carr
1961, Bulletin of the Geological Society of America (72) 1739-1748
While mapping the American Falls region, we found evidence that contributes to the middle Pleistocene to Recent history of the Snake River, and indirectly to the history of overflow of Lake Bonneville. Middle Pleistocene to recent rocks in the valley are mainly lacustrine and fluvial silts and clays, with some...
Some aspects of the geochemistry of sphalerite, Central City District, Colorado
P.K. Sims, P. B. Barton Jr.
1961, Economic Geology (56) 1211-1237
Detailed studies of sphalerite, as a part of a larger study of the Central City district, Colorado, have been undertaken to learn something of the physico-chemical environment of ore deposition. More than 90 samples have been analyzed by chemical and spectrochemical methods and these data are interpreted in the light...
Sandstone-type uranium deposits at Ambrosia Lake, New Mexico-An interim report
H.C. Granger, E.S. Santos, B.G. Dean, F. B. Moore
1961, Economic Geology (56) 1179-1210
The Ambrosia Lake district in northwestern New Mexico is the most important uranium mining and milling district in the United States. Together with the nearby Laguna district it contains more than 50 percent of the nation's reserves.Most of the ore occurs in the Morrison formation of Late Jurassic age as elongate, tabular, mantolike...
Ages of batholithic intrusions of northern and central Chile
Carlos F. Ruiz, Luis Aguirre, Jose Corvalan, H.J. Rose, Kenneth K. Segerstrom, T.W. Stern
1961, Geological Society of America Bulletin (72) 1551-1559
Their stratigraphic setting demonstrates that three batholithic intrusions in northern and central Chile are respectively pre-Jurassic, Jurassic, and Cretaceous. Radiometric age determinations, by the lead-alpha (Larsen) method, indicate ages of 265 ± 30, 120 ± 15 to 125 ± 15, and 95 ± 10 to 130 ± 15 million years respectively for samples from the...
Granitic formations in the east-central Sierra Nevada near Bishop, California
Paul C. Bateman
1961, Bulletin of the Geological Society of America (72) 1521-1537
This report establishes lithologic units among the granitic rocks of the east-central Sierra Nevada near Bishop, California. In this area the Sierra Nevada batholith is composed chiefly of quartz-bearing plutonic rocks ranging in composition from quartz diorite to alaskite but includes scattered small masses of darker and older plutonic rocks and remnants of metamorphosed...
Bankfull discharge: An example of its statistical relationships
G.H. Dury
1961, International Association of Scientific Hydrology - Bulletin (6) 48-55
Analysis of data for the White and Wabash Rivers suggests means of determining discharge at the natural bankfull stage, despite the effects of artificial embanking and clearance of channels. Bankfull discharge, and discharge at mean annual flood, undergo an orderly downstream increase in percentage duration of flow....
Beryllium-bearing tuff in the Thomas Range, Juab County, Utah
M. H. Staatz, W. R. Griffitts
1961, Economic Geology (56) 941-950
Recently discovered beryllium deposits in the Thomas Range, Utah, are along the periphery of the fluorspar district at Spor Mountain. The beryllium is in altered rhyolite tuff of Tertiary age and is associated with genetically related fluorite, quartz, chalcedony, opal, calcite, and mont-morillonite and with residual quartz, feldspar, and biotite. Nodules of silica...
A comparison of analytical methods used in geochemical prospecting for copper
L.C. Huff, T.G. Lovering, H. W. Lakin, A.T. Myers
1961, Economic Geology (56) 855-872
Analytical methods used in geochemical prospecting for copper were compared by analysis of samples of residual soil collected in duplicate near a copper-bearing vein at the Malachite mine, Jefferson County, Colo. In this area barren or "background" samples have a mean copper content of 58 ppm (parts per million) and anomalous samples containing copper derived from the...