Exploration geochemical studies of some sandstone copper-uranium deposits, Bradford, Columbia, and Lycoming Counties, Pa
F. G. Lesure, J. M. Motooka, P. L. Weis
1977, Journal of Research of the U.S. Geological Survey (5) 609-621
Semi-quantitative spectrographic analyses of mineralized and unmineralized sandstone, siltstone, and claystone from the Catskill Formation of Devonian age in Bradford, Columbia, and Lycoming Counties, Pa., suggest that copper, silver, and uranium are the principal metallic elements concentrated in the mineralized rock. Lead, mercury, and molybdenum may be concentrated slightly in...
Rare earths, thorium, and other minor elements in sphene from some plutonic rocks in west-central Alaska
Mortimer H. Staatz, Nancy M. Conklin, Isabelle K. Brownfield
1977, Journal of Research of the U.S. Geological Survey (5) 623-628
Sphene is an abundant accessory mineral in some abnormally radioactive plutonic rocks in west-central Alaska. Seven samples of sphene from four different areas in west-central Alaska contained from 20350 to 39180 parts per million total rare earths and 390 to 2000 ppm thorium. The lanthanide content in six of the...
Occurrence of bloedite and related minerals in marine shale of Diablo and Temblor Ranges, California
K. J. Murata
1977, Journal of Research of the U.S. Geological Survey (5) 637-642
Bloedite, epsomite, and related minerals occur in small amounts throughout the arid eastern foothills of the Diablo and Temblor Ranges, as efflorescences on siliceous shale and as deposits around small springs and a brine pond. These minerals ultimately are products of weathering of underlying organic shale, and they are reminders...
Use of a hybrid computer in engineering-seismology research
R.B. Park, W. W. Hays
1977, Journal of Research of the U.S. Geological Survey (5) 651-661
A hybrid computer is an important tool in the seismological research conducted by the U.S. Geological Survey in support of the Energy Research and Development Administration nuclear explosion testing program at the Nevada Test Site and the U.S. Geological Survey Earthquake Hazard Reduction Program. The hybrid computer system, which employs...
A method for adjusting values of Manning's roughness coefficient for flooded urban areas
H. R. Hejl Jr.
1977, Journal of Research of the U.S. Geological Survey (5) 541-545
A method is presented for adjusting values of Manning's roughness coefficient for flooded urban areas on the basis of the density of buildings on a flood plain and verified roughness coefficients for natural conditions. An urban roughness coefficient can be calculated to emulate the water-surface profiles to within 0.06 meter...
Periphyton and phytoplankton in the Sacramento River, California, May 1972 to April 1973
Linda J. Britton
1977, Journal of Research of the U.S. Geological Survey (5) 547-559
Periphyton and phytoplankton samples were collected monthly at five sites in the Sacramento River between May 1972 and April 1973. Periphyton were analyzed for species identification and biomass, and phytoplankton were analyzed for species identification and concentrations. The results were used to assess biological water-quality conditions in the river and...
Chemical structure of humic acids - Part 1, a generalized structural model
R.L. Wershaw, D.J. Pinckney, S.E. Booker
1977, Journal of Research of the U.S. Geological Survey (5) 565-569
A new model is proposed for the structure of humic acids. In this model humic acid is pictured as being made up of a hierarchy of structural elements. At the lowest level in this hierarchy are simple phenolic, quinoid, and benzene carboxylic acid groups. These groups are bonded covalently into...
Chemical structure of humic acids - Part 2, the molecular aggregation of some humic acid fractions in N, N-dimethylformamide
R.L. Wershaw, D.J. Pinckney
1977, Journal of Research of the U.S. Geological Survey (5) 571-577
Humic acid fractions form molecular aggregates in solution. In previous studies we have shown by small angle X-ray scattering that the size of these aggregates is a function of pH. In this study we have found that the size of the aggregates of two humic acid fractions in water and...
Thallium contents of 16 USGS standard rocks
F.O. Simon, E.Y. Campbell, P. J. Aruscavage
1977, Journal of Research of the U.S. Geological Survey (5) 579-581
Thallium was determined in 16 USGS standard rocks by atomic absorption spectroscopy in which a heated graphite atomizer was used after extraction as thallium iodide into amyl acetate. Four subsamples from four bottles of each standard sample, except G-1 and W-1, were analyzed in random order, and the average thallium...
An improved ion-selective electrode method for the rapid determination of fluorine in rocks and soil
D.M. Hopkins
1977, Journal of Research of the U.S. Geological Survey (5) 589-593
An improved method based on an ion-selective electrode technique for the analysis of fluorine in rocks and soils is presented. Analyses are made by using a sodium carbonate-potassium carbonate fusion and a citric acid dissolution of the fuseate. Prior to determining the fluorine concentration by a standard-addition procedure, sodium citrate...
A thermostatic water bath for experimental studies in aqueous solutions
R. M. Siebert, K.A. McGee, P. B. Hostetler
1977, Journal of Research of the U.S. Geological Survey (5) 597-602
A temperature-controlled water bath for the study of ion-pairing equilibria and mineral solubility in aqueous solutions below 100°C is described. The bath is similar to a previously described system (P. B. Hostetler and C. L. Christ, 1968, U.S. Geol. Survey Prof. Paper 600-D, p. D217-D221) but incorporates several significant improvements....
Maps published of Antarctica by the U.S. Geological Survey
Water Resources Division, U.S. Geological Survey
1977, Report
The Geological Survey in cooperation with the National Science Foundation prepares and publishes topographic maps of selected areas of Antarctica needed to support the U.S. Antarctic Research Program (USARP) efforts. These maps are prepared from aerial photography flown by U.S. Navy Air Development Squadron Six (VXE-6) in accordance with USGS...
Geology of the dry creek site; a stratified early man site in Interior Alaska
R.M. Thorson, T. D. Hamilton
1977, Quaternary Research (7) 149-176
The Dry Creek archeologic site contains a stratified record of late Pleistocene human occupation in central Alaska. Four archeologic components occur within a sequence of multiple loess and sand layers which together form a 2-m cap above weathered glacial outwash. The two oldest components appear to be of late Pleistocene...
A Holocene vegetation record from the Mississippi River Valley, southeastern Missouri
J.E. King, W.H. Allen Jr.
1977, Quaternary Research (8) 307-323
Pollen preserved in a peat deposit from a large swamp, the Old Field in the Mississippi River Valley near Advance, Missouri, records radiocarbon-dated vegetation changes between 9000 and about 3000 years ago. The principal feature of both the percentage and influx pollen diagrams is the replacement of arboreal pollen, primarily Quercus,...
Radiocarbon dates and late-Quaternary stratigraphy from Mamontova Gora, unglaciated central Yakutia, Siberia, U.S.S.R.
T. L. Pewe, A. Journaux, R. Stuckenrath
1977, Quaternary Research (8) 51-63
A fine exposure of perennially frozen ice-rich silt and associated flora and vertebrate fauna of late-Quaternary age exists at Mamontova Gora along the Aldan River in central Yakutia, Siberia, U.S.S.R. The silt deposit caps a 50-m-high terrace and consists of three units. An upper layer 1–2 m thick overlies a...
Late-Pleistocene and Holocene remains of Hysterocarpus traski (Tule Perch) from Clear Lake, California, and inferred Holocene temperature fluctuations
R.W. Casteel, D.P. Adam, J.D. Sims
1977, Quaternary Research (7) 133-143
The remains of scales of Hysterocarpus traski Gibbons (Tule perch) were found throughout a 27.44-m core from Clear Lake. Most scales occurred between the mud surface and deposits approximately 11,000 years old. Changes in growth rates of the animals were examined by measuring scale annuli and applying an empirically established regression of...
Structure and sediment distribution in the western Bering Sea
P. D. Rabinowitz, A. Cooper
1977, Marine Geology (24) 309-320
Eleven seismic reflection profiles across Shirshov Ridge and the adjacent deep-water sedimentary basins (Komandorsky and Aleutian Basins) are presented to illustrate the sediment distribution in the western Bering Sea. A prominent seismic reflecting horizon, Reflector P (Middle—Late Miocene in age), is observed throughout both the Aleutian and Komandorsky Basins at...
The organic geochemistry of black sedimentary barite: Significance and implications of trapped fatty acids
R.E. Miller, D.A. Brobst, P.C. Beck
1977, Organic Geochemistry (1) 11-26
Fatty acids isolated in sedimentary black barite (BaSO4) from Arkansas and Nevada were identified by gas chromatography-mass spectroscopy. The dominant or major fatty acids found in these beds of barite are C16:0, C18:0, and C18:1. The occurrence and distribution of these acids in this type of rock may serve as...
Search for seismic forerunners to earthquakes in central California
R. L. Wesson, R. Robinson, C. G. Bufe, W.L. Ellsworth, J. H. Pfluke, J.A. Steppe, L. C. Seekins
1977, Tectonophysics (42) 111-126
The relatively high seismicity of the San Andreas fault zone in central California provides an excellent opportunity to search for seismic forerunners to moderate earthquakes. Analysis of seismic traveltime and earthquake location data has resulted in the identification of two possible seismic forerunners. The first is a period of apparently...
Empirical law for fault-creep events
S.Thomas Crough, Robert O. Burford
1977, Tectonophysics (42) T53-T59
Fault-creep events measured on the San Andreas and related faults near Hollister, California, can be described by a rheological model consisting of a spring, power-law dashpotand sliding block connected in series. An empirical creep-event law, derived from many creep-event records analyzed within the constraints of the model, provides a remarkably...
Geochemistry of Precambrian mafic dikes, central Bighorn Mountains, Wyoming, U.S.A.
T.J. Armbrustmacher
1977, Precambrian Research (4) 13-38
Precambrian quartz dolerites and metadolerites of the central Bighorn Mountains form dikes that intrude a Precambrian metamorphic and igneous terrane typical of the Laramide uplifts of the middle Rocky Mountains. They have a restricted range of major- and trace-element compositions and are typical of basalts in the middle stages of...
Suspended particulate loads and transports in the nepheloid layer of the abyssal Atlantic Ocean
P.E. Biscaye, S.L. Eittreim
1977, Marine Geology (23) 155-172
Vertical profiles of light scattering from over 1000 L-DGO nephelometer stations in the Atlantic Ocean have been used to calculate mass concentrations of suspended particles based on a calibration from the western North American Basin. From these data are plotted the distributions of particulate concentrations at clear water and in...
Determination of 30 elements in coal and fly ash by thermal and epithermal neutron-activation analysis
J.J. Rowe, E. Steinnes
1977, Talanta (24) 433-439
Thirty elements are determined in coal and fly ash by instrumental neutron-activation analysis using both thermal and epithermal irradiation. Gamma-ray spectra were recorded 7 and 20 days after the irradiations. The procedure is applicable to the routine analysis of coals and fly ash. Epithermal irradiation was found preferable for the...
Explanation to accompany preliminary map showing bedrock geology superposed on an aeromagnetic base map of the Worcester region, Massachusetts, Connecticut, and Rhode Island
Patrick James Barosh
1977, Open-File Report 77-131
Verification of a model for predicting the effect of inconstant temperature on embryonic development of lake whitefish (Coregonus clupeaformis)
William H. Berlin, L.T. Brooke, Linda J. Stone
1977, Technical Paper 92
Eggs stripped from lake whitefish (Coregonus clupeaformis) spawning in Lake Michigan were incubated in the laboratory at temperatures similar to those on whitefish spawning grounds in Lake Michigan during December-April. Observed times from fertilization to attainment of each of 21 developmental stages were used to test a model that predicts...
