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Page 6823, results 170551 - 170575

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Publication Extents

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Geomorphology and forest ecology of a mountain region in the central Appalachians
John Tilton Hack, John C. Goodlett
1960, Professional Paper 347
The area studied, mostly in the headwaters of the Shenandoah River, Augusta and Rockingham Counties, Va., includes about 55 square miles of densely forested mountain land and has an average relief of about 1,500 feet. It is part of an area that in June 1949 was subjected to a violent...
Gravity survey in part of the Snake River Plain, Idaho — A preliminary report
Harry L. Baldwin Jr., David P. Hill
1960, Open-File Report 60-11
During the early summer of 1959, a total of 1,187 gravity stations were occupied on the western part of the Snake River plain in Idaho. An area of 2,000 square miles extending from Glenns Ferry, Idaho, to Caldwell, Idaho, was covered with a station density of one station per two...
Minor element abundance in a part of the Brazilian shield
N. Herz, C. V. Dutra
1960, Geochimica et Cosmochimica Acta (21) 81-98
Thirty-nine samples of granitic rocks from the Quadrilátero Ferrifero, Minas Gerais, Brazil, representing "mixed" ages and at least three distinct Pre-Cambrian ages were analysed for seventeen minor elements. The rocks are placed in five groups:, (1) 2400 million year old group;, (2) Bacao complex younger, a group of mixed rocks...
A comprehensive system of automatic computation in magnetic and gravity interpretation
R.G. Henderson
1960, Geophysics (25) 569-585
In the interpretation of magnetic and gravity anomalies, downward continuation of fields and calculation of first and second vertical derivatives of fields have been recognized as effective means for bringing into focus the latent diagnostic features of the data. A comprehensive system has been devised for the calculation of any or all of these...
Thickness and consolidation of deep-sea sediments: A discussion
G.H. Davis
1960, Bulletin of the Geological Society of America (71) 1727-1728
Hamilton (1959) concluded that in most sediments excess pore-water pressure is equal to zero - that is, the hydrostatic pressure is at atmospheric pressure. This note points out that in terrestrial environments the occurrence of artesian water (excess pore-water pressure) is commonplace and widespread and that such excess pressure is the...
Grid method of determining mean flow-distance in a drainage basin
M.W. Busby, M. A. Benson
1960, International Association of Scientific Hydrology - Bulletin (5) 32-36
The basin characteristics Σal or L ca are useful in hydrologic studies, but existing methods of determining them are either tedious or somewhat inaccurate. The grid method presented herein lessens the amount of tedious labor and provides an accurate measure of either Σal or L ca . An adaptation of the method could be used to compute the...
Transcurrent faulting and volcanism in Owens Valley, California
L. C. Pakiser
1960, Bulletin of the Geological Society of America (71) 153-160
In the Owens Valley region of California, volcanic activity of Cenozoic age was confined mainly to three areas near the ends of important faults. The volcanic eruptions seemingly took place in regions of relative tension, if the horizontal movement along these faults was left lateral. The deep depression of Owens Valley may have...
Foothills fault system, western Sierra Nevada, California
L. D. Clark
1960, Bulletin of the Geological Society of America (71) 483-496
A large fault system, here named the Foothills fault system, is the dominant structural feature of the western Sierra Nevada. The steeply dipping to vertical component faults trend northwestward through an area about 200 miles long and 30 miles wide north of 37°30' north latitude. The faulted Paleozoic and Mesozoic...