Structure and Paleozoic stratigraphy of a complex of thrust plates in the Fish Creek Reservoir area, south-central Idaho
Betty A. Skipp, Wayne E. Hall
1975, Journal of Research of the U.S. Geological Survey (3) 671-689
Permian, Pennsylvanian, Mississippian, Devonian, and Silurian marine rocks of diverse facies are brought together in a complex of six thrust sheets in the Fish Creek Reservoir area on the north edge of the Snake River Plain, Idaho. The lowest structural element, the parautochthon, is made of more than 450 m...
Evaluation of stochastic models describing movement of sediment particles on riverbeds
Petar Todorovic, Carl F. Nordin Jr.
1975, Journal of Research of the U.S. Geological Survey (3) 513-517
Various stochastic models have been proposed to describe the movement of sediment particles on the riverbed. Here it is attempted to summarize in an integrated form and to generalize the most important theoretical results in this field. The approach adopted in this paper is based on the fact that most...
A typical cross section based on magnetic data of lower and middle Keweenawan volcanic rocks, Ironwood area, Michigan
Elizabeth R. King
1975, Journal of Research of the U.S. Geological Survey (3) 543-546
A north-trending aeromagnetic profile of a sequence of east-striking Keweenawan volcanic rocks near Ironwood, Mich., can be matched to a calculated profile over a model consisting of a series of dipping layers. (The dips were those measured by H. A. Hubbard along the north-trending valley of the Black River.) Remanent...
Tectonics of the western Valley and Ridge foldbelt, Pendleton County, West Virginia - a summary report
William J. Perry Jr.
1975, Journal of Research of the U.S. Geological Survey (3) 583-588
A belt of high anticlines, the Nittany anticlinorium, occupies the western Valley and Ridge foldbelt in the central Appalachians. It extends southwestward from the Nittany arch of central Pennsylvania into the Virginias. An investigation of the tectonics of this anticlinorium in Pendleton County, W. Va., rules out active basement involvement...
Quaternary faults at San Diego Bay, California
George W. Moore, Michael P. Kennedy
1975, Journal of Research of the U.S. Geological Survey (3) 589-595
Acoustic-reflection profiles of subbottom strata reveal numerous faults that cut Quaternary deposits within and directly outside of San Diego Bay. These faults, together with previously mapped onshore faults, constitute the Rose Canyon fault zone that forms the local west boundary of the Santa Ana tectonic block, which is bounded on...
Optimal exploitation strategies for an animal population in a Markovian environment: A theory and an example
David R. Anderson
1975, Ecology (56) 1281-1297
Optimal exploitation strategies were studied for an animal population in a Markovian (stochastic, serially correlated) environment. This is a general case and encompasses a number of important special cases as simplifications. Extensive empirical data on the Mallard (Anas platyrhynchos) were used as an example of general theory. The number of...
Morphology and phylogeny of the coccolithophycean family Ceratolithaceae
Stefan Gartner, David Bukry
1975, Journal of Research of the U.S. Geological Survey (3) 451-465
The family Ceratolithaceae includes a group of horseshoe-shaped calcareous nannofossils and contains ten species which are assignable to two genera: Amaurolithus n. gen. and Ceratolithus. Species of Amaurolithus are characterized by showing faint or no birefringence in cross-polarized light when viewed in preferred orientation. Included in Amaurolithus are A. amplificus...
Rockfall seismicity correlation with field observations, Makaopuhi Crater, Kilauea Volcano, Hawaii
Robert I. Tilling, Robert Y. Koyanagi, Robin T. Holcomb
1975, Journal of Research of the U.S. Geological Survey (3) 345-361
During August 7-13, 1972, intense and sustained rockfall activity occurred in Makaopuhi Crater on the east-rift zone of Kilauea Volcano. In a 4-day period (August 7-10), approximately 270,000 m3 of rockfall debris accumulated in Makaopuhi's west pit, representing a total kinetic energy release of about 101B ergs. Because the rockfalls...
Geology, geochemistry, and fluid-inclusion petrography of the Sapo Alegre porphyry copper prospect and its metavolcanic wallrocks, west-central Puerto Rico
Dennis P. Cox, Ileana Perez Gonzalez, J. Thomas Nash
1975, Journal of Research of the U.S. Geological Survey (3) 313-327
The Sapo Alegre prospect, a small porphyry copper-molybdenum occurrence in west-central Puerto Rico, is characterized by distinct zones of alteration and mineralization of quartz diorite porphyry. A biotite-chlorite zone in the porphyry near its contact with surrounding metavolcanic rocks contains copper, molybdenum, gold, silver, selenium, and tellurium. A quartz-sericite-pyrite zone...
Fluid inclusion studies of vein, pipe, and replacement deposits, northwestern San Juan Mountains, Colorado
J. Thomas Nash
1975, Economic Geology (70) 1448-1462
Base and precious metal ores valued in excess of $300 million have been mined from vein, pipe, and replacement deposits located on the northwest side of, and structurally related to, the middle Tertiary Silverton caldera. A belt of normal faults radial to the caldera contains veins which have been mined...
The distribution of seepage within lakebeds
M.S. McBride, H.O. Pfannkuch
1975, Journal of Research of the U.S. Geological Survey (3) 505-512
The mutual exchange of water between lakes and contiguous permeable ground-water bodies, which are thin relative to the diameter of the lakes, was modeled digitally. A significant rate of seepage was found to extend only a relatively short distance from shore, thus forming a narrow band around the lake's perimeter....
Effects of lowering interior canal stages on salt-water intrusion into the shallow aquifer in southeast Palm Beach County, Florida
Larry F. Land
1975, Open-File Report 75-74
Land in southeast Palm Beach County is undergoing a large-scale change in use, from agricultural to residential. To accommodate residential use, a proposal has been made by developers to the Board of the Lake Worth Drainage District to lower the canal stages in the interior part of the area undergoing...
Notes on the origin of Colluma Crater, Bolivia
Sam Rosenblum, Reed J. Anderson
1975, Journal of Research of the U.S. Geological Survey (3) 31-38
Colluma Crater, on the semiarid Altiplano (high plain) of western Bolivia, is an oval structure having overall dimensions of 6.7 km by 6.0 km. The structure has two almost concentric cuestaform rims (the inner rim is 3.6 km by 3.1 km) composed of poorly consolidated clastic sediments that dip outward....
Preliminary description and interpretation of cores and radiographs from Clear Lake, Lake County, California: Core 7
John D. Sims, Michael J. Rymer
1975, Open-File Report 75-144
Clear Lake, California is located in the California Coast Ranges about 120 km north of San Francisco and is the largest freshwater lake wholly within California. The lake basin is tectonically controlled (Anderson, 1936; Brice, 1953, Sims and Rymer, 1974) and the area seismically active (Coffman and von Hake, 1973).Interest...
Trace element evaluation of a suite of rocks from Reunion Island, Indian Ocean
R. A. Zielinski
1975, Geochimica et Cosmochimica Acta (39) 713-734
Reunion Island consists of an olivine-basalt shield capped by a series of flows and intrusives ranging from hawaiite through trachyte. Eleven rocks representing the total compositional sequence have been analyzed for U, Th and REE. Eight of the rocks (group 1) have positive-slope, parallel, chondrite-normalized REE fractionation patterns. Using a...
Mercury distribution in ancient and modern sediment of northeastern Bering Sea
C.H. Nelson, D.E. Pierce, Kam Leong, F.F.H. Wang
1975, Marine Geology (18) 91-104
Reconnaissance sampling of surface and subsurface sediment to a maximum depth of 80 m below the sea floor shows that typical values of 0.03 p.p.m. and anomalies of 0.2-1.3 p.p.m. mercury have been present in northeastern Bering Sea since Early Pliocene time. Values are highest in modern beach (maximum 1.3...
Modes of fossil preservation
J.M. Schopf
1975, Review of Palaeobotany and Palynology (20) 27-53
The processes of geologic preservation are important for understanding the organisms represented by fossils. Some fossil differences are due to basic differences in organization of animals and plants, but the interpretation of fossils has also tended to be influenced by modes of preservation....
Determining earthquake recurrence intervals from deformational structures in young lacustrine sediments
John D. Sims
1975, Tectonophysics (29) 141-152
Examination of the silty sediments in the lower Van Normal reservoir after the 1971 San Fernando, California earthquake revealed three zones of deformational structures in the 1-m-thick sequence of sediments exposed over about 2 km2 of the reservoir bottom. These zones are correlated with moderate earthquakes that shook the San Fernando...
A high 87Sr 86Sr mantle source for low alkali tholeiite, northern Great Basin
R. K. Mark, Hu C. Lee, H. R. Bowman, F. Asaro, E.H. McKee, R.R. Coats
1975, Geochimica et Cosmochimica Acta (39) 1671-1678
Olivine tholeiites, the youngest Tertiary units (about 8–11 m.y. old) at five widely spaced localities in northeastern Nevada, are geologically related to the basalts of the Snake River Plain, Idaho, to the north and are similar in major element and alkali chemistry to mid-ocean ridge basalts (MORB) and island arc...
Thin-section electron microscopy of mature Myxosoma cerebralis (Myxosporidea) spores
P.D. Lunger, B.L. Rhoads, K. Wolf, M.E. Markiw
1975, Journal of Parasitology (61) 476-480
The morphology of purified, mature Myxosoma cerebralis spores was examined by thin-section electron microscopy. Surface architecture corresponded closely to that described in an earlier scanning electron microscopy study of this organism (Lom and Hoffman, 1971). A uniformly thick spore wall is composed of finely granular, electron-lucent material. Intrawall "valvoplasm" at...
History of fish toxicants in the United States
K.B. Cumming
1975, Special Publication 4
Many bodies of water have been overrun with fish species that are undesirable for the well-being of endemic aquatic biota and are of little or no interest to anglers. This situation has resulted from the transplanting of fish, creation of new waters, increasing fishing pressure and changing water quality. Although...
Duck plague: carrier state and gross pathology in black ducks
Jorge E. Ossa
1975, Thesis
Duck plague (UP) is a highly fatal disease of ducks, geese, and swans (family Anatidae), produced by a reticulo-endotheliotrophic virus classified as a member of the Herpesvirus group. The disease was recognized in Europe in 1949. On the American continent, the disease was first diagnosed in the United States in...
Improved digital filters for evaluating Fourier and Hankel transform integrals
Walter L. Anderson
1975, Report
New algorithms are described for evaluating Fourier (cosine, sine) and Hankel (J0,J1) transform integrals by means of digital filters. The filters have been designed with extended lengths so that a variable convolution operation can be applied to a large class of integral transforms having the same...
Ground-water data in the Harrisburg-Halsey area, central Willamette Valley, Oregon
F. J. Frank, Nyra A. Johnson
1975, Report
THE HARRISBURG-HALSEY AREA COVERS ABOUT 350 SQUARE MILES IN THE CENTRAL WILLAMETTE VALLEY, OREG., AND IS PART OF A BROAD ALLUVIAL PLAIN THAT LIES BETWEEN THE CASCADE AND COAST RANGES IN THE CENTRAL PART OF THE WILLAMETTE VALLEY. MOST OF...
Mineral resource models and the Alaskan Mineral Resource Assessment Program
Donald A. Singer
W. A. Vogely, editor(s)
1975, Book chapter, Mineral materials modeling A state-of-the-art review
The least exacting demand that can be made of any model is that it serves as a device whereby we can predict actual physical happenings. Another demand which could be made is that the physical happenings predicted be in some way relevant to man, either by allowing him to anticipate...
