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...
The glacial history of Alaska: It's bearing on paleoclimatic theory
Thor N. V. Karlstrom
1961, Annals of the New York Academy of Sciences (95) 290-340
No abstract available. ...
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...
Toxicity of an epoxy cement to fishes
Donald F. Mairs
1961, Progressive Fish-Culturist (23) 178-178
No abstract available. ...
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....
Surface water records of North Dakota and South Dakota
Water Resources Division, U.S. Geological Survey
1961, Report
No abstract available....
Surface water records of Arkansas
Water Resources Division, U.S. Geological Survey
1961, Report
No abstract available....
Publications on the National Wildlife Refuges, 1961.
U.S. Bureau of Sport Fisheries and Wildlife
1961, Wildlife Leaflet 438
No abstract available....
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...
Selected list of informational leaflets on wildlife
U.S. Fish and Wildlife Service
1961, Wildlife Leaflet 437
No abstract available....
Late Wisconsin age of terrace alluvium along the North Loup River, central Nebraska: A revision
Robert D. Miller, Glenn R. Scott
1961, GSA Bulletin (72) 1283-1284
A radiocarbon age of 10,500±250 years B.P. (Before Present) from shell material near the base of a terrace along the North Loup River, Howard County, Nebraska, dates the alluvial sequence of silts and soils as late Wisconsin. The alluvium containing the shell material previously was reported as...
Sex ratios and age raios in North American ducks
Frank C. Bellrose, Thomas G. Scott, Arthur S. Hawkins, Jessop B. Low
1961, Illinois Natural History Survey Bulletin (27) 391-474
The sex classes and age classes of various species of ducks constitute measurable elements of the populations. The present study deals primarily with sex ratios and age ratios and the ways in which they relate to population productivity. The present study is an evaluation of sex and age ratios in...
Dating desert ground water
L. Thatcher, M. Rubin, Glen F. Brown
1961, Science (134) 105-106
Tritium in Arabian rainfall has followed the trend observed in North America with peaks in 1958 and the spring of 1959. These measurements will be useful for future hydrologie studies. Water from wadi gravels averages 10 yr old. Carbon-14 measurements of deep waters indicate ages of several thousand years....
Use of water-well data in interpreting occurrence of aquifers in northeastern Lyon County, Minnesota
Harry G. Rodis
1961, GSA Bulletin (72) 1275-1278
In northeastern Lyon County the areal distribution of aquifers of Cretaceous age determined from well-bottom altitudes suggests a series of interbedded sandstones striking northwestward and overlapping one another to the northeast. Probably the numerous thin sandstone aquifers in the area were deposited near the flanks of a Precambrian granite “high”...
Distribution of uranium ore deposits in the elk ridge area, San Juan County, Utah
R. H. Campbell, R.Q. Lewis
1961, Economic Geology (56) 111-131
The Elk Ridge area of southeastern Utah contains uranium ore deposits in two lower members of the Chinle formation of Late Triassic age. Each member is mineralized in different parts of the area, and where both are present only the lower contains ore. Across the Elk Ridge area from southwest to northeast, successively younger beds...
