D. R. Shawe, F. G. Poole, D.A. Brobst
1969, Economic Geology (64) 245-254
No abstract available....
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Publication Extents
Not all publications have extents, not all extents are completely accurateCharles M. Taylor, Arthur S. Radtke
1969, Economic Geology (64) 306-318
Detailed mineralogical and chemical study of sphalerite-rich lead ores from Flat River, Mo., confirms the presence of anomalous amounts of silver in the sphalerite. Although silver is closely associated with chlorine and no silver sulfide minerals were identified, geochemical considerations indicate the silver may be...
T. T. Chao
1969, Economic Geology (64) 287-290
A method has been developed whereby nanogram amounts of gold in waters can be accurately determined. The development of the method involves determination of optimum conditions for the complete recovery of gold from water using an anion exchange resin column, quantitative elution of gold from the resin, and final measurement...
F.B. Turner, P.A. Medica, J.R. Lannom Jr., G.A. Hoddenbach
1969, Radiation Research (38) 349-356
A natural population of the lizard Uta stansburiana occupying a fenced 20-acre area in southern Nevada has been exposed to essentially continuous gamma irradiation since February 1964. Tissue doses averaged about 2 rads/day. Nonirradiated populations occupying three adjoining 20-acre areas have also been investigated. Five years of sampling data drawn...
Willamette Basin Task Force
1969, Report, Willamette Basin comprehensive study of water and related land resources
The study was undertaken to plan for the proper development of water andrelated land resources of the Willamette Basin in Oregon. Appendix B, along with Appendices A and C, provides supporting data for the functional Appendices D through L. Climate is first discussed, including the climatic significance of geographical features such as the...
S.H. Mamay
1969, Science (164) 295-296
Plant fossils from Lower Permian strata of the southwestern United States have been interpreted as cycadalean megasporophylls. They are evidently descended from spermopterid elements of the Pennsylvanian Taeniopteris complex; thus the known fossil history of the cycads is extended from the Late Triassic into the late Paleozoic. Possible implications...
J. M. Schopf
1969, Science (164) 63-66
Similarities of middle and upper Paleozoic deposits of the Ellsworth Mountains with those of the Pensacola, Horlick, and other Transantarctic mountains indicate that all these ranges may have had a related geologic history. A tentative explanation is now suggested which involves sea-floor spreading and translocation of the...
H.C. Granger, C. G. Warren
1969, Economic Geology (64) 160-171
Anomalous concentrations of iron sulfides found at roll fronts are believed to result from limited oxidation and mobilization of reduced sulfur species from earlier formed pyrite within the more extensively oxidized core of the roll. Laboratory experiments and chemical theory suggest that the reactions need not be biogenic, and that...
James Gilluly
1969, Economic Geology (64) 228-228
No abstract available....
W. J. Moore, Marvin A. Lanphere, J. D. Obradovich
1969, Economic Geology (64) 229-229
No abstract available....
Robert Schoen
1969, Geological Society of America Bulletin (80) 643-650
Sulfuric acid forms near sulfurous hot springs as the result of oxidation of hydrogen sulfide exhalations by atmospheric oxygen. This strong acid rapidly alters the surrounding rocks and can destroy man-made structures and contaminate streams. Four tracts of acid-altered ground in Yellowstone National Park were studied in order to determine...
C. L. McGuinness
1969, Groundwater (7) 7-10
Four principal trends in ground water are apparent:(1) Increasing use of ground water for domestic supplies. Geohydrologists must learn to quantitatively evaluate the supply under conditions of maximum development, not merely determine the availability of a supply that does not strain the aquifer. (2) Aquifers will be looked to increasingly...
Carl E. Hedge, Roy J. Knight
1969, Geochemical Journal (3) 15-24
Isotopic compositions of lead and strontium and concentrations of lead, uranium, thorium, rubidium, and strontium were measured in a suite of volcanic rocks, ranging from basalt to rhyodacite in composition, and in granite and gabbro xenoliths from a traverse across northern Honshu. The observed 238U/204Pb (μ) ratio ranges from 2.4 in...
William G. Ayrton, William B. N. Berry, Arthur J. Boucot, Jean Lajoie, Pierre J. Lesperance, Louis Pavlides, W. Brian Skidmore
1969, Geological Society of America Bulletin (80) 459-483
Rocks of clearly dated early Llandovery age, as well as rocks that can logically be classed as early Llandovery from their regional relationships, appear to be more widespread than recognized, heretofore, in the northern Appalachians and adjacent regions. Their areal distribution and lithology permit a generalized reconstruction of the paleogeography,...
Arthur H. Lachenbruch, B. Vaughan Marshall
1969, Arctic (22) 300-311
Defines heat flow as the flux at the earth's solid surface of heat conducted from the interior; the heat-flow-unit (hfu) is on the order of 1-millionth calorie through each sq cm of the surface/sec, which is enough to melt a 4-mm layer of ice over the earth's surface/yr. Earth heat...
L.J. Patrick Muffler, Donald E. White
1969, Geological Society of America Bulletin (80) 157-181
The Salton Sea geothermal system is entirely within Pliocene and Quaternary sediments of the Colorado River delta at the north end of the Gulf of California. At the time of deposition, these sediments consisted of sands, silts, and clays of uniform original mineralogic composition, but under the elevated temperatures and...
D.W. Scholl, F.C. Craighead Sr., M. Stuiver
1969, Science (163) 562-564
New data substantiate as well as modify the south Florida submergence curve, which indicates that eustatic sea level has risen continuously, although at a generally decreasing rate, during the last 6500 to 7000 sidereal years (5500 standard radiocarbon years) to reach its present position. Accumulation rates of coastal deposits are...
G. R. Himmelberg, J. J. Papike
1969, Journal of Petrology (10) 102-114
Four pairs of associated calcic and sodic amphiboles from blueschist facies metamorphic rocks were analyzed with the electron microprobe and studied by single-crystal X-ray diffraction techniques. Except for ranges in the ratios Mg/(Mg+Fe) and Fe3+/(Fe3++Al+Ti), the sodic amphiboles are similar in chemical composition. The amount of calcium in the M(4)-site...
David H. Warren
1969, Geological Society of America Bulletin (80) 257-282
The U.S. Geological Survey conducted a seismic-refraction study of the earth's crust and upper mantle near the Tonto Forest Seismological Observatory (TFO), located 10miles south of the Mogollon Rim near Payson in central Arizona. Two recording lines 400 km long intersect in the approximate form of a cross at TFO;...
Edwin D. McKee, Moshe Goldberg
1969, Geological Society of America Bulletin (80) 231-243
Contorted structures can be formed in mud or sand as a result of differential loading. Fifteen sets of experiments were conducted in water tanks to test various factors of possible significance in the contortion of mud by loading. Of six factors tested, the most significant was distribution of load, but...
W. H. Bradley
1969, Limnology and Oceanography (14) 1-3
Examples of vertical density currents wholly within the domain of laminar flow, one in a water solution, the other in air, have come to my attention. Both examples illustrate new ways of introducing and dispersing microscopic particles into static fluids and both demonstrate that a stable, clearly defined layer of...
James G. Moore, Richard S. Fiske
1969, GSA Bulletin (80) 1191-1202
Ocean-bottom photographs from 18 stations and dredge hauls from 35 stations adjacent to the Island of Hawaii indicate that basaltic pillow lava and pillow fragments are the dominant rock type on the crest and flanks of the submarine rift zone ridges, whereas glassy basalt sand and scoria are the dominant...
Ellis L. Yochelson
1969, Lethaia (2) 49-62
Cambridium, Bagenovia, and Stenothecoides, composing the Family Cambridiidae, a monotypic superfamily and an order, were in 1960 assigned (although with a query) to the molluscan class Monoplacophora. The basic error of this assignment, according to the author, was the assumption that these specimens are univalves. One specimen from Siberia and a...
Fred K. Fields
1969, Report
This report is a compilation of data pertaining to floods in Rios Guayanilla and Yauco, based principally upon information obtained from residents in the study area. This information is a useful tool in making land-use and development decisions.The Guayanilla and Yauco basins lie in the southwestern part of Puerto Rico....
J. F. Poland, G. H. Davis
David J. Varnes, George Kiersch, editor(s)
1969, Book chapter, Reviews in Engineering Geology
Land-surface subsidence due to the withdrawal of fluids by man has become relatively common in the United States since 1940 and has been described at several other places throughout the world. This paper reviews the known examples of appreciable land subsidence caused by fluid withdrawal. Those related to exploitation of...