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Page 2078, results 51926 - 51950

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Ichnofossils of the alluvial Willwood Formation (lower Eocene), Bighorn Basin, northwest Wyoming, U.S.A
T. M. Bown, M. J. Kraus
1983, Palaeogeography, Palaeoclimatology, Palaeoecology (43) 95-128
The ichnofossil assemblage of the lower Eocene Willwood Formation consists of at least nine distinct endichnia that are preserved in full relief. Four forms (three ichnogenera and four ichnospecies) are new and represent fodinichnia and domichnia of oligochaete worms, an insect or spider, an unknown vertebrate (probably a mammal), and...
Paleoclimatic analyses of middle Eocene through Oligocene planktic foraminiferal faunas
G. Keller
1983, Palaeogeography, Palaeoclimatology, Palaeoecology (43) 73-94
Quantitative faunal analyses and oxygen isotope ranking of individual planktic foraminiferal species from deep sea sequences of three oceans are used to make paleoceanographic and paleoclimatic inferences. Species grouped into surface, intermediate and deep water categories based on δ18O values provide evidence of major changes in water-mass stratification, and individual...
Accumulation of fossil fuels and metallic minerals in active and ancient rift lakes
Eleanora I. Robbins
1983, Tectonophysics (94) 633-658
A study of active and ancient rift systems around the world suggests that accumulations of fossil fuels and metallic minerals are related to the interactions of processes that form rift valleys with those that take place in and around rift lakes. The deposition of the precursors of petroleum, gas, oil...
Separation of arsenic(III) and arsenic(V) in ground waters by ion-exchange
Walter H. Ficklin
1983, Talanta (30) 371-373
The predominant species of arsenic in ground water are probably arsenite and arsenate. These can be separated with a strong anion-exchange resin (Dowex 1 × 8; 100–200 mesh, acetate form) in a 10 cm × 7 mm column. Samples are filtered and acidified with concentrated hydrochloric acid (1 ml per...
Hydrology of area 54, northern Great Plains, and Rocky Mountain coal provinces, Colorado and Wyoming
Gerhard Kuhn, P. D. Daddow, G. S. Craig
1983, Open-File Report 83-146
A nationwide need for information characterizing hydrologic conditions in mined and potential mine areas has become paramount with the enactment of the Surface Mining Control and Reclamation Act of 1977. This report, one in a series covering the coal provinces nationwide, presents information thematically by describing single hydrologic topics through...
Hydrology of area 38, Western Region, Interior Coal Province, Iowa and Missouri
M.G. Detroy, John Skelton
1983, Open-File Report 82-1014
A nationwide need for information characterizing hydrologic conditions in mined and potential mine areas has become paramount with the enactment of the Surface Mining Control and Reclamation Act of 1977. This report is designed to be useful to the mine owners, operators, and others by presenting information about the existing...
The oil and gas industry of coastal Louisiana and its effects on land use and other socioeconomic patterns
Donald W. Davis, John L. Place
1983, Open-File Report 83-118
Louisiana's coastal wetlands, alone with their well-drained urbanized strips, have been significantly affected by the oil and gas industry. Onshore, more than 6,300 exploratory wells and more than 21,000 development wells were drilled in Louisiana's eight southernmost parishes between 1937 and 1977. Nearly all those wells were in wetlands or...
Geohydrology and model analysis of the stream-aquifer system along the Arkansas River in Kearny and Finney counties, southwestern Kansas
L. E. Dunlap, Richard J. Lindgren, C. G. Sauer
1983, Open-File Report 83-222
A study was made, in cooperation with the Division of Water Resources, Kansas State Board of Agriculture, to determine geohydrologic conditions in an area comprising nearly 850,000 acres along the Arkansas River valley in Kearny and Finney Counties, southwestern Kansas. The Arkansas River meanders atop and interacts hydraulically with the...
Data from the surface-water hydrologic investigations of the Hay Creek Study Area, Montana, and the West Branch Antelope Creek Study Area, North Dakota, October 1976 through April 1982
Douglas G. Emerson, Steven W. Norbeck, Kelvin L. Boespflug
1983, Open-File Report 83-136
Data are provided for the Hay Creek study area near Wibaux, Mont., and the West Branch Antelope Creek study area near Beulah, N. Dak. The report contains data on the following: Air temperature, relative humidity, wind direction, wind run, solar radiation, precipitation, soil temperature, snowpack temperature, snowpack density and water...
Ground-water quality data for Oklahoma, 1981
Dale M. Ferree
1983, Open-File Report 83-686
The U.S. Geological Survey has collected data on Oklahoma's ground-water resources since 1934. Most of these data were collected as part of specific ground-water studies conducted in cooperation with various Federal, State, and local agencies. Ground-water quality data, as well as data on construction, yield, water levels, and other physical...
Continuous seismic-reflection survey defining shallow sedimentary layers in the Charlotte Harbor and Venice areas, southwest Florida
R. M. Wolansky, F.P. Haeni, R.E. Sylvester
1983, Water-Resources Investigations Report 82-57
A continuous marine seismic-reflection survey system was used to define the configuration of shallow sedimentary layers underlying the Charlotte Harbor and Venice areas, southwest Florida. Seismic profiling was conducted over a distance of about 57 miles of Charlotte Harbor, the Peace and Myakka Rivers, and the Intracoastal Waterway near Venice...
Analyses of elutriates, native water, and bottom material in selected rivers and estuaries in western Oregon and Washington
Gregory J. Fuhrer, Frank A. Rinella
1983, Open-File Report 82-922
Chemical analyses of elutriates, bottom sediment and water samples for selected metals, nutrients and organic compounds including insecticides and herbicides have been made to provide data to determine short-term water quality conditions associated with dredging operations in rivers and estuaries. Between May and December 1980 data were collected as far...
Hydrology of the Price River basin, Utah, with emphasis on selected coal-field areas
K.M. Waddell, J.E. Dodge, D.W. Darby, S.M. Theobald
1983, Open-File Report 83-208
Data obtained during a hydrologic study of the Price River basin, Utah, are used to describe seasonal variations of flow of springs, relation between ground water and surface water, hydraulic properties of the ground-water reservoir, ground-water recharge and discharge, flood characteristics of streams, mineralogic composition and depositional rates of sediments,...