The transverse and oblique cylindrical equal-area projection of the ellipsoid.
J.P. Snyder
1985, Annals of the Association of American Geographers (75) 431-442
The formulas for the ellipsoidal projection are derived for both forward and inverse computations and consist of modifying the formulas obtained by using the authalic sphere so that the scale along the central line of the projection is constant. Fourier series are used to eliminate recurring numerical integration and other...
Wavelike movement of bedload sediment, East Fork River, Wyoming
R.H. Meade
1985, Environmental Geology and Water Sciences (7) 215-225
Bedload is moved down the East Fork River in distinct wavelike pulses that have the form of composite dune fields The moving material consists mostly of coarse sand and fine gravel The wavelengths of the pulses are about 500-600 m, a distance that is predetermined by the pattern of stoage...
Case for periodic, colossal jokulhlaups from Pleistocene glacial Lake Missoula
R. B. Waitt Jr.
1985, Geological Society of America Bulletin (96) 1271-1286
Two classes of field evidence firmly establish that late Wisconsin glacial Lake Missoula drained periodically as scores of colossal jökulhlaups (glacier-outburst floods). (1) More than 40 successive, flood-laid, sand-to-silt graded rhythmites accumulated in back-flooded valleys in southern Washington. Hiatuses are indicated between flood-laid...
Simulated fissioning of uranium and testing of the fission-track dating method
V.E. McGee, N.M. Johnson, C. W. Naeser
1985, Nuclear Tracks and Radiation Measurements (1982) (10) 365-379
A computer program (FTD-SIM) faithfully simulates the fissioning of 238U with time and 235U with neutron dose. The simulation is based on first principles of physics where the fissioning of 238U with the flux of time is described by Ns = ??f 238Ut and the fissioning of 235U with the...
Scarp degraded by linear diffusion: Inverse solution for age
D.J. Andrews, Thomas C. Hanks
1985, Journal of Geophysical Research Solid Earth (90) 10193-10208
Under the assumption that landforms unaffected by drainage channels are degraded according to the linear diffusion equation, a procedure is developed to invert a scarp profile to find its “diffusion age.” Diffusion age, having dimension [length]2, is the product of diffusivity times chronological age. The second moment of scarp slope...
Geochemical mass-balance relationships for selected ions in precipitation and stream water, Catoctin Mountains, Maryland
B. G. Katz, O.P. Bricker, M.M. Kennedy
1985, American Journal of Science (285) 951-962
Results of a study of input/output mass balances for major ions based on the chemical composition of precipitation and stream-water, geochemical reactions with different loading rates of hydrogen ion, and watershed processes influencing the chemical character of stream-waters in two small watershed areas are reported with a view to predicting...
CONCEPTUAL FRAMEWORK FOR REGRESSION MODELING OF GROUND-WATER FLOW.
Richard L. Cooley
1985, Conference Paper
The author examines the uses of ground-water flow models and which classes of use require treatment of stochastic components. He then compares traditional and stochastic procedures for modeling actual (as distinguished from hypothetical) systems. Finally, he examines the conceptual basis and characteristics of the regression approach to modeling ground-water flow....
SURVEYS OF COASTAL STRUCTURES USING GEOPHYSICAL TECHNIQUES.
John R. Dingler, Roberto J. Anima
Billy L. Edge, editor(s)
1985, Conference Paper, Proceedings of the Coastal Engineering Conference
During the summer of 1983 and the spring and summer of 1984, the authors conducted side scan sonar and shallow subbottom surveys in conjunction with bathymetric and diving surveys along three northern California coastal structures to determine the condition of the structures before extensive damage occurred. Then the applicability of...
TRANSIENT SOUNDING INVESTIGATION OF NEWBERRY VOLCANO, OREGON.
David V. Fitterman, Deborah K. Neev
1985, Conference Paper, Transactions - Geothermal Resources Council
Transient electromagnetic soundings were used to map the geoelectrical structure of Newberry Volcano in central Oregon. An extensive conductor was found to underlie the volcano and to have resistivities from 20 OMEGA m to 72 OMEGA m. The depth to the conductor ranges from 410 m to 870 m. Inside...
APPLICATIONS OF BOREHOLE-ACOUSTIC METHODS IN ROCK MECHANICS.
Frederick L. Paillet
1985, Conference Paper, Proceedings - Symposium on Rock Mechanics
Acoustic-logging methods using a considerable range of wavelengths and frequencies have proven very useful in the in situ characterization of deeply buried crystalline rocks. Seismic velocities are useful in investigating the moduli of unfractured rock, and in producing a continuous record of rock quality for comparison with discontinuous intervals of...
Electrical geophysical investigations of massive sulfide deposits and their host rocks, West Shasta copper-zinc district
R. J. Horton, B. D. Smith, J.C. Washburne
1985, Economic Geology (80) 2213-2229
The West Shasta copper-zinc district, Shasta County, California, contains many volcanogenic sulfide deposits within Middle Devonian rhyolites that have not been highly metamorphosed. The district was selected by the U.S. Geological Survey for intensive geological, geochemical, and geophysical study under the Development of Assessment Techniques (DAT) project because accessible exposures...
EARTHQUAKE PERFORMANCE OF A BRIDGE DECK AND ABUTMENT.
M. Çelebi, G. Brady
C.A. Brebbia, A.S. Cakmak, Abdel Ghaffar, editor(s)
1985, Conference Paper
During the 24 April 1984 Morgan Hill Earthquake (M equals 6. 1), 15 channels of acceleration records were obtained at the site of the I-280-680/US 101 interchange 12 km west of the epicenter. These records include free field measurements as well as the acceleration response at one of the supporting...
Antigen uptake by gill cells of Atlantic salmon given bath immunizations with Yersinia ruckeri bacterins
D. P. Anderson, A.G. Zapata, M. Wisniewski
1985, American Zoologist (25) 75A-75A
No abstract available....
Subdivision of thick sedimentary units into layers for simulation of groundwater flow
J. S. Weiss, A. K. Williamson
1985, Groundwater (23) 767-774
Subdividing thick sedimentary units into model layers based solely on stratigraphy can lead to serious violation of groundwater flow modeling restraints and produce erroneous results. Borehole geophysical data can be used to suggest relative permeabilities and delineate model layers that are more likely to have uniform hydraulic properties than layers...
Federal coal resource occurrence and coal development potential maps of the Pinehaven 7 1/2-minute quadrangle, McKinley County, New Mexico
Berge Exploration Inc.
1985, Open-File Report 80-40
No abstract available....
Comparison of methods for estimating ground-water pumpage for irrigation
Steven A. Frenzel
1985, Groundwater (23) 220-226
Ground-water pumpage for irrigation was measured at 32 sites on the eastern Snake River Plain in southern Idaho during 1983. Pumpage at these sites also was estimated by three commonly used methods, and pumpage estimates were compared to measured values to determine the accuracy...
Magadi-type chert, indicator of a lacustrine environment in the Middle Eocene McBean formation, South Carolina.
B. B. Houser
1985, Southeastern Geology (25) 185-197
Magadi-type chert (chert derived from magadiite) occurs in the basal part of the formation at three localities in Orangeburg and Calhoun Counties. These occurrences imply that the basal part of the McBean formation was deposited here in an alkaline lake with a high silica content. Formation and filling of the...
Geology of the Brick Flat massive sulfide body, Iron Mountain cluster, West Shasta district, California
J. P. Albers
1985, Economic Geology (80) 2092-2099
The Brick Flat massive sulfide body is one of a group of 8 individual bodies that constitute the Iron Mountain cluster in the S part of the West Shasta district. Before they were separated by postmineral faulting, 5 of the 8 sulfide bodies formed a single large deposit about 1375...
Carboniferous paleogeographic, phytogeographic, and paleoclimatic reconstructions
D.B. Rowley, A. Raymond, Judith T. Parrish, A.L. Lottes, C.R. Scotese, A.M. Ziegler
1985, International Journal of Coal Geology (5) 7-42
Two revised paleogeographic reconstructions of the Visean and Westphalian C-D stages are presented based on recent paleomagnetic, phytogeographic, stratigraphic, and tectonic data. These data change the positions of some continental blocks, and allow the definition of several new ones. The most...
Degradation of carbohydrates and lignins in buried woods
J. I. Hedges, G.L. Cowie, J.R. Ertel, Barbour R. James, Patrick G. Hatcher
1985, Geochimica et Cosmochimica Acta (49) 701-711
Spruce, alder, and oak woods deposited in coastal sediments were characterized versus their modern counterparts by quantification of individual neutral sugars and lignin-derived phenols as well as by scanning electron microscopy, 13C NMR, and elemental analysis. The buried spruce wood from a 2500 yr old deposit was unaltered whereas an alder wood from...
U-Pb isochron age and Pb isotope systematics of the Golden Fleece vein; implications for the relationship of mineralization to the Lake City caldera, western San Juan Mountains, Colorado
K. Hon, K.R. Ludwig, K. R. Simmons, J. F. Slack, R. I. Grauch
1985, Economic Geology (80) 410-417
A U-Pb isochron age of 27.5 + or - 0.5 m.y. has been determined for the Golden Fleece vein, southwestern Colorado, which contains an assemblage of pitchblende and gold-silver tellurides unique within the Lake City area. Initial Pb isotope ratios of ore samples from the vein ( 206 Pb/ 204 Pb = 19.08-19.58; 207 Pb/ 204 Pb =...
Assessment of nasal marker materials and designs used on dabbling ducks
J. T. Lokemoen, D.E. Sharp
1985, Wildlife Society Bulletin (13) 53-56
Abstract has not been submitted...
Composition and morphology of ferromanganese coatings on glacial erratics in Lydonia Canyon, United States East Coast
L.J. Poppe, Dennis W. O’Leary, R.F. Commeau
1985, Geo-Marine Letters (5) 127-133
Ferromanganese coatings have been found on glacial erratics in Lydonia Canyon, off the United States northeastern coast. The coatings, which are about 17 ??m thick, consist of an outer manganese-rich layer which covers the top of the erratic, a middle transitional layer, and an internal iron-rich layer that encircles the...
Comparison of digestion methods for total elemental analysis of peat and separation of its organic and inorganic components
C. S.E. Papp, T. F. Harms
1985, The Analyst (110) 237-242
In order to find the most efficient digestion method for the total elemental recovery in peat, ten samples were subjected to different techniques and analysed for Ca, Mg, Fe, AI, Na, K, Mn, P, Zn, Cu, Li, Cd, Co, Ni, Pb and Si using atomic-absorption spectrophotometry. The most satisfactory procedures...
A quantitative analysis of the Lassen hydrothermal system, north central California
S. E. Ingebritsen, M.L. Sorey
1985, Water Resources Research (21) 853-868
Our conceptual model of the Lassen system is termed a liquid-dominated hydrothermal system with a parasitic vapor-dominated zone. The essential feature of this model is that steam and steam-heated discharge at relatively high altitudes in Lassen Volcanic National Park (LVNP) and liquid discharge with high chloride concentrations at relatively low...
