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Page 6150, results 153726 - 153750

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Publication Extents

Not all publications have extents, not all extents are completely accurate
Drainage areas of Iowa streams
O.J. Larimer
1957, Iowa Highway Research Board Bulletin 7
The drainage area of a stream at a specified location ordinarily may be defined as that area, measured in a horizontal plane, which is enclosed by a topographic divide such that direct surface runoff from precipitation would drain by gravity into the river basin above the specified point. One of the...
Notes on the structural geology of Puerto Rico
C. A. Kaye
1957, GSA Bulletin (68) 103-118
Two major structural and stratigraphic rock units occur in Puerto Rico: the older complex, ranging in known age from Late Cretaceous to late Paleocene or early Eocene and the middle Tertiary sequence, ranging from late Oligocene possibly to late Miocene. The former rocks are eugeosynclinal in character and are very...
Lithofacies of the salt wash member of the Morrison Formation, Colorado plateau
T. E. Mullens, V. L. Freeman
1957, Geological Society of America Bulletin (68) 505-526
The Salt Wash is the basal member of the Upper Jurassic Morrison Formation in parts of Utah, Colorado, Arizona, and New Mexico. Deposited by streams, it comprises lenticular beds of cross-laminated sandstone irregularly interbedded with mudstone, siltstone, claystone, and horizontally laminated sandstone. The term "lithofacies," as used in this paper,...
Franciscan group in Coast Ranges and its equivalents in Sacramento Valley, California
William P. Irwin
1957, American Association of Petroleum Geologists Bulletin (41) 2284-2297
The Franciscan group is an assemblage of detrital and chemical sedimentary and volcanic rocks that crops out discontinuously in a structurally complex, northwesterly trending belt along the Coast Ranges of Cahfornia. On the east, along the west side of the Sacramento Valley, a thick section of detrital sedimentary rocks has...
Chapter 22: Environments and facies of existing bays on the central Texas coast
H. S. Ladd, J.W. Hedgpeth, R.J. Post
1957, Memoir of the Geological Society of America (67) 599-640
The estuaries and neritic waters along the central Texas coast are characterized by broad ranges of environmental factors, providing conditions favorable to temperate organisms in winter and tropical organisms in summer. Dredging in the coastal waters revealed a number of distinct faunal facies, the distribution of which appears to be...
Gravity prospecting for chromite deposits in Camaguey Province, Cuba
Willard E. Davis, Wayne H. Jackson, D.H. Richter
1957, Geophysics (22) 848-869
Detailed gravity surveys were made in Camaguey Province, Cuba, as part of a systematic exploration program conducted by the U. S. Geological Survey on behalf of the General Services Administration to locate deposits of refractory-grade chromite. During the period August 4, 1954, to April 5, 1956, a total of 41,921...
Eastern and central Montana as a possible source area of uranium
Frank Clarkson Armstrong
1957, Economic Geology (52) 211-224
Geologic settings in central and eastern Montana and in a few places in southwestern Montana are similar to the settings in areas favorable for the occurrence of uranium deposits. Several areas in Montana seem especially favorable for the occurrence of uranium.The alkalic igneous rock province of central Montana is similar...
A truckmounted spectrographic laboratory for use in geochemical exploration
Frank C. Canney, A.T. Myers, F. N. Ward
1957, Economic Geology (52) 289-306
A truck-mounted spectrographic laboratory has been designed and built by the U. S. Geological Survey to investigate the feasibility of using and transporting such equipment in the field as an aid in supplying rapid on-the-spot analytical data to geochemical exploration field parties.The laboratory is housed inside a 7- X 12-foot...
Some limitations on the possible composition of the ore-forming fluid
Paul B. Barton
1957, Economic Geology (52) 333-353
The activity ratios of various important anions (S (super =) , CO 3 (super =) , SO 4 (super =) , OH (super -) , F (super -) , and Cl (super -) ) in hydrothermal solutions at the time of deposition are evaluated using a simple thermodynamic technique. The ratios are interpreted in...
Effects of radon in drill holes on gamma-ray logs
Lowell Sinclair Hilpert, Carl Maurice Bunker
1957, Economic Geology (52) 438-455
Drill holes in uranium deposits in the Todilto limestone of Late Jurassic age near Grants, New Mexico, do not yield duplicate gamma-ray logs when probed at different times; some logs show equivalent uranium greatly in excess, in thickness and grade, of the chemical and laboratory radiometric analyses. Radon and its...
Occurrence of selenium in sulfides from some sedimentary rocks of the western United States
R. G. Coleman, Maryse Helen Delevaux
1957, Economic Geology (52) 499-527
Investigations of the minor- and trace-element content of sulfides associated with uranium ore deposits from sandstone-type deposits have shown that selenium commonly substitutes for sulfur. The Morrison formation and Entrada sandstone of Jurassic age and the Wind River formation of Eocene age seem to be...
Discussion of “Application of the modified einstein procedure for computation of total sediment load”
K. B. Schroeder, C. H. Hembree
1957, Eos, Transactions, American Geophysical Union (38) 768-773
Basically, any theory consists of a set of assumptions and various conclusions which are logically derived therefrom. An assumption, as the term is to be used here, may be based on an observed fact or relationship, a definition, an undefined (but generally accepted and understood) concept; or it may be...