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...
Remotely sensed limonite anomaly on Lordsburg Mesa, New Mexico: Possible implications for uranium deposits
G. L. Raines, J. A. Erdman, J. H. McCarthy, G.M. Reimer
1985, Economic Geology (80) 575-590
We have identified a large, anomalously limonitic area in Cenozoic gravels on Lordsburg Mesa near Lordsburg, New Mexico, using Landsat images. Our interpretation of the geophysical and geochemical data suggests the exploration hypothesis that the Lordsburg Mesa limonite anomaly is the surface expression of a chemical trap that may contain...
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...
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...
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....
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...
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...
Phase relations and adiabats in boiling seafloor geothermal systems
J. L. Bischoff, Kenneth S. Pitzer
1985, Earth and Planetary Science Letters (75) 327-338
Observations of large salinity variations and vent temperatures in the range of 380–400°C suggest that boiling or two-phase separation may be occurring in some seafloor geothermal systems. Consideration of flow rates and the relatively small differences in density between vapors and...
Movement of volatile organics through a fractured rock aquifer
S.E. Spayd
1985, Groundwater (23) 496-502
In response to the detection of contaminants in several municipal water supply wells in a northern New Jersey community, the New Jersey Department of Environmental Protection (NJDEP) undertook a detailed assessment of the movement of volatile organics through the Brunswick fractured rock aquifer. Understanding the...
COMPARISON OF RECORDING CURRENT METERS USED FOR MEASURING VELOCITIES IN SHALLOW WATERS OF SAN FRANCISCO BAY, CALIFORNIA.
Jeffrey W. Gartner, Richard N. Oltmann
1985, Conference Paper, Oceans Conference Record (IEEE)
The authors determine the feasibility of collecting reliable current-meter data in shallow water under natural conditions. The study involved field testing four types of recording current meters (different speed sensors) and comparing data recorded by the meters under different field conditions. Speeds recorded by the current meters at slack water...
A comparative study of stream water and stream sediment as geochemical exploration media in the Rio Tanama porphyry copper district, Puerto Rico
R. E. Learned, T. T. Chao, R. F. Sanzolone
1985, Journal of Geochemical Exploration (24) 175-195
To test the relative effectiveness of stream water and sediment as geochemical exploration media in the Rio Tanama porphyry copper district of Puerto Rico, we collected and subsequently analyzed samples of water and sediment from 29 sites in the rivers and tributaries of the district. Copper, Mo, Pb, Zn, SO42−,...
Ground-water flow in the Coastal Plain aquifers of South Carolina
W. R. Aucott, G. K. Speiran
1985, Groundwater (23) 736-745
The characteristics of the Coastal Plain aquifers of South Carolina are being studied as a part of the Regional Aquifer System Analysis program of the United States Geological Survey. Potentiometric maps were constructed for the Middendorf aquifer of Cretaceous age and for the Floridan...
Correlation of the Rockland ash bed, a 400,000-year-old stratigraphic marker in northern California and western Nevada, and implications for middle Pleistocene paleogeography of central California
A.M. Sarna-Wojcicki, C.E. Meyer, H. R. Bowman, Hall N. Timothy, P.C. Russell, M.J. Woodward, J. L. Slate
1985, Quaternary Research (23) 236-257
Outcrops of an ash bed at several localities in northern California and western Nevada belong to a single air-fall ash layer, the informally named Rockland ash bed, dated at about 400,000 yr B.P. The informal Rockland pumice tuff breccia, a thick, coarse, compound tephra deposit southwest of Lassen Peak in...
FLUORINE IN COLORADO OIL SHALE.
John R. Dyni
Gary James H., editor(s)
1985, Conference Paper, Oil Shale Symposium Proceedings
Oil shale from the lower part of the Eocene Green River Formation in the Piceance Creek Basin, Colorado, averages 0. 13 weight percent fluorine, which is about twice that found in common shales, but is the same as the average amount found in some oil shales from other parts of...
A seismic-refraction profile across the San Andreas, Sargent, and Calaveras faults, west-central California
Walter D. Mooney, Robert H. Colburn
1985, Bulletin of the Seismological Society of America (75) 175-191
In 1981, the United States Geological Survey recorded a seismic-refraction profile across the southern Santa Cruz Mountains in west-central California to examine the shallow velocity structure of this seismogenic region. This 40-km-long profile, which consisted of three shotpoints, extended northeastward from near Watsonville, California, to Coyote Lake, crossing the San...
The effect of glaciers on streamflow variations
Andrew G. Fountain, Wendell V. Tangborn
1985, Water Resources Research (21) 579-586
The effect of temperate glaciers on runoff variations is examined for the North Cascade Mountains of Washington State. The principal influences of glaciers on streamflow are often unexpected contributions to streamflow volume, a delay of the maximum seasonal flow, and a decrease in annual and monthly variation of runoff. The...
Linear inversion of transmitted acoustic wave fields for three-dimensional modulus and density perturbations using a born-type approximation
Douglas A. Stauber
1985, Bulletin of the Seismological Society of America (75) 93-114
A Born approximation is used to linearize the relationship, in the horizontal-wavenumber and frequency domains, between lateral perturbations of modulus and density in a layered half-space and the acoustic wave field observed at the surface when a plane wave is incident from below. The resulting equations can be used to...
Geochemistry: Uses for synthetic fluid inclusions in quartz crystals
E. Roedder
1985, Nature (315) 544-545
[No abstract available]...
PROCEDURES FOR ACCURATE PRODUCTION OF COLOR IMAGES FROM SATELLITE OR AIRCRAFT MULTISPECTRAL DIGITAL DATA.
Joseph S. Duval
1985, Journal of Imaging Technology (10) 16-22
Because the display and interpretation of satellite and aircraft remote-sensing data make extensive use of color film products, accurate reproduction of the color images is important. To achieve accurate color reproduction, the exposure and chemical processing of the film must be monitored and controlled. By using a combination of sensitometry,...
Calaveras reversed: Westward younging is indicated
P. C. Bateman, A. G. Harris, R. W. Kistler, K.B. Krauskopf
1985, Geology (13) 338-341
Samples of limestone collected from strata in the southern part of the western metamorphic belt of the Sierra Nevada, which traditionally have been assigned to the Calaveras Formation, have yielded Early Triassic conodonts, and samples of metavolcanic rock indicate an Early Jurassic Rb-Sr...
Abundance fluctuations among benthic invertebrates in two pacific estuaries
Frederic H. Nichols
1985, Estuaries (8) 136-144
Long-term studies were used to examine (1) contrasting time scales and mechanisms of structural variations within two benthic communities and (2) the usefulness of long data sets for evaluating human impact. A 10-year study of a San Francisco Bay mudflat, the details of which are reported elsewhere, has revealed large...
Relationship between reported commercial landings and abundance of young striped bass in Chesapeake Bay, Maryland
C.P. Goodyear
1985, Transactions of the American Fisheries Society (114) 92-96
The ability to predict subsequent landings of striped bass Morone saxatilis from the indices of abundance of juveniles (young of the year) determined annually by the Maryland Department of Natural Resources was evaluated by multiple‐regression techniques. About 57% of the variation in reported landings could be accounted for by the...
Ground-water flow in the Prairie du Chien-Jordan aquifer related to contamination by coal-tar derivatives, St. Louis Park, Minnesota
J. R. Stark, M. F. Hult
1985, Water-Resources Investigations Report 85-4087
A three-dimensional, ground-water-flow model of the Prairie du Chien-Jordan aquifer and associated hydrogeologic units was developed to evaluate the movement of coal-tar derivatives from a coal-tar distillation and wood-preserving plant in St. Louis Park, Minnesota. A finite-difference grid was superimposed on the modeled area, which includes most of eastern Hennepin...
Compilation of hydrologic data for the Edwards Aquifer, San Antonio area, Texas, 1982, with 1934-82 summary
R.D. Reeves, G. B. Ozuna
1985, Edwards Underground Water District Bulletin 42
No abstract available....
