Role of submarine canyons in shaping the rise between Lydonia and Oceanographer canyons, Georges Bank
Bonnie A. McGregor
1985, Marine Geology (62) 277-293
Three large submarine canyons, Oceanographer, Gilbert, and Lydonia, indent the U.S. Atlantic continental shelf and, with four additional canyons, dissect the continental slope in the vicinity of Georges Bank. On the upper rise, these canyons merge at a water depth of approximately 3100 m to form only two valleys. Differences...
ORTHOPHOTOQUAD MAPPING PROGRAM FOR ALASKA.
James R. Plasker
1985, Conference Paper
The U. S. Geological Survey (USGS) is the lead civilian mapping agency in the United States and is responsible for creating and maintaining numerous map series. In Alaska the standard topographic map series is at a scale of 1:63,360, and maps at that scale have been available from the USGS...
RE-EVALUATION OF THE ORIGIN AND DIAGENESIS OF BORATE DEPOSITS, DEATH VALLEY REGION, CALIFORNIA.
Charles E. Barker, James M. Barker
Barker James M.Lefond Stanley J., editor(s)
1985, Conference Paper
An understanding of the age of the major borate deposits in the Furnace Creek Formation, their origin and facies relationships, as well as their diagenetic and thermal history, are integrated to provide a geological model of borate deposition in a heliothermal, saline, perennial lake....
Genetic interpretation of lead-isotopic data from the Columbia River basalt group, Oregon, Washington, and Idaho
S. E. Church
1985, Geological Society of America Bulletin (96) 676-690
Lead-isotopic signatures of basalts from the Columbia River Basalt Group of central Oregon, Washington, and western Idaho, and of the high-alumina olivine basalts from southeastern Oregon plot mostly in the field of Pb-isotopic data from volcanic rocks of the Cascade Range. In contrast to the mid-ocean ridge basalts (MORB), the...
The age and origin of felsic intrusions of the Thetford Mines ophiolite, Quebec
D.A. Clague, C.S. Frankel, J.S. Eaby
1985, Canadian Journal of Earth Sciences (22) 1257-1261
The Thetford Mines ophiolite in southern Quebec was obducted in Early Ordovician time during the closing of the proto-Atlantic. The tectonized peridotite lower unit of the ophiolite is intruded by felsic dikes and pods including isolated lenses of massive rodingite, small bodies of strongly deformed diorite, and younger, less deformed...
The use of natural waters as U.S. Geological Survey reference samples
Victor J. Janzer
1985, Conference Paper, Quality Assurance for Environmental Measurements
The U.S. Geological Survey conducts research and collects hydrologic data relating to the Nation's water resources. Two water quality laboratories in Atlanta, Georgia, and Denver, Colorado, support the national research programs, and provide chemical analyses of natural waters for the data program. Additional chemical water quality data are provided by...
Limnocythere bradburyi n.sp.: a modern ostracode from central Mexico and a possible Quaternary paleoclimatic indicator
R. M. Forester
1985, Journal of Paleontology (59) 8-20
Limnocythere bradburyi is a new species of nonmarine ostracode that is living in several lakes in the central Mexican Plateau. These lakes are shallow, turbid, and pan-shaped, having relatively unstable and fluid substrates. Water levels of these lakes are high in the summer and low or dry in the winter....
Federal coal resource occurrence and coal development potential maps of the Pillar 3 SE 7 1/2-minute quadrangle, San Juan and McKinley Counties, New Mexico
Berge Exploration Inc.
1985, Open-File Report 79-1379
No abstract available....
Map of Antelope Valley-East Kern Water Agency area, California, showing ground-water subunits and areas, location of wells, and lines of equal depth to water for spring 1983
W. R. Moyle Jr., Florence M. Glenn
1985, Open-File Report 84-726
No abstract available....
40Ar/39Ar and K-Ar data bearing on the metamorphic and tectonic history of western New England
J. F. Sutter, N. M. Ratcliffe, S.B. Mukasa
1985, Geological Society of America Bulletin (96) 123-136
40Ar/39Ar ages of coexisting biotite and hornblende from Proterozoic Y gneisses of the Berkshire and Green Mountain massifs, as well as 40Ar/39Ar and K-Ar mineral and whole-rock ages from Paleozoic metamorphic rocks, suggest that the thermal peak for the dominant metamorphic recrystallization in western New England occurred 465 ± 5 m.y....
Possible tsunami along the northwestern coast of the United States inferred from Indian traditions
Thomas H. Heaton, Parke D. Snavely Jr.
1985, Bulletin of the Seismological Society of America (75) 1455-1460
No abstract available....
ON PREDICTING INFRAGRAVITY ENERGY IN THE SURF ZONE.
Sallenger Jr., Robert A. Holman
Billy L. Edge, editor(s)
1985, Conference Paper, Proceedings of the Coastal Engineering Conference
Flow data were obtained in the surf zone across a barred profile during a storm. RMS cross-shore velocities due to waves in the intragravity band (wave periods greater than 20 s) had maxima in excess of 0. 5 m/s over the bar crest. For comparison to measured spectra, synthetic spectra...
TOPOGRAPHY, STRESSES, AND STABILITY AT YUCCA MOUNTAIN, NEVADA.
Henri Wolfs, William Z. Savage
1985, Conference Paper, Proceedings - Symposium on Rock Mechanics
Plane-strain solutions are used to analyze the influence of topography on the state of stress at Yucca Mountain, Nye County, Nevada. The results are in good agreement with the measured stress components obtained in drill holes by the hydraulic-fracturing technique, particularly those measured directly beneath the crest of the ridge,...
RECOVERY OF MONTEREY BAY BEACHES AFTER THE WINTER STORMS OF 1982-83.
John R. Dingler, Roberto J. Anima, H. Edward Clifton
1985, Conference Paper, Coastal Zone: Proceedings of the Symposium on Coastal and Ocean Management
The El Nino conditions of 1982 and 1983 produced unusually frequent and intense storms along the central California coast. These storms produced much greater than normal beach erosion in Monterey Bay, causing extensive damage to coastal structures, erosion of coastal cliffs, and loss of sand from coastal dunes. The beaches...
Land subsidence caused by ground water withdrawal in urban areas
T.L. Holzer, A.I. Johnson
1985, GeoJournal (11) 245-255
At least eight urban areas in the world have encountered significant economic impact from land subsidence caused by pumping of ground water from unconsolidated sediment. The areas, most of which are coastal, include Bangkok, Houston, Mexico City, Osaka, San Jose, Shanghai, Tokyo, and Venice. Flooding related to decreased ground elevation...
Forecast model for moderate earthquakes near Parkfield, California
William D. Stuart, Ralph J. Archuleta, Allan Goddard Lindh
1985, Journal of Geophysical Research Solid Earth (90) 592-604
Earthquake instability models have possible application to earthquake forecasting because the models simulate both preseismic and coseismic changes of fault slip and ground deformation. In the forecast procedure proposed here, repeated measurements of preseismic fault slip and ground deformation constrain the values of model parameters. The early part of the...
Dissolution of alkaline earth sulfates in the presence of montmorillonite
D. D. Eberl, Edward R. Landa
1985, Water, Air, & Soil Pollution (25) 207-214
In a study of the effect of montmorillonite on the dissolution of BaSO4 (barite), SrSO4 (celestite), and 226Ra from U mill tailings, it was found that: (1) More of these substances dissolve in an aqueous system that contains montmorillonite than dissolve in a similar system without clay, due to the...
Hydrocarbon source rock evaluation of Middle Proterozoic Solor Church Formation, North American Mid-Continent Rift System, Rice County, Minnesota
J. R. Hatch, G. B. Morey
1985, American Association of Petroleum Geologists Bulletin (69) 1208-1216
Hydrocarbon source rock evaluation of the Middle Proterozoic Solor Church Formation (Keweenawan Supergroup) as sampled in the Lonsdale 65-1 well, Rice County, Minnesota, shows that: (1) the rocks are organic matter lean (24 of 25 samples have less than 0.8% organic carbon); (2) the organic matter is thermally post-mature, probably...
Analysis of the low-flow characteristics of streams in Louisiana
Fred N. Lee
1985, Water Resources Technical Report of the Louisiana Department of Transportation and Development, Office of Public Works 35
The U.S. Geological Survey, in cooperation with the Louisiana Department of Transportation and Development, Office of Public Works, used geologic maps, soils maps, precipitation data, and low-flow data to define four hydrographic regions in Louisiana having distinct low-flow characteristics. Equations were derived, using regression analyses, to estimate the 7Q2, 7Q10,...
Absolute calibration of Landsat instruments using the moon.
H. H. Kieffer, R.L. Wildey
1985, Photogrammetric Engineering and Remote Sensing (51) 1391-1393
A lunar observation by Landsat could provide improved radiometric and geometric calibration of both the Thematic Mapper and the Multispectral Scanner in terms of absolute radiometry, determination of the modulation transfer function, and sensitivity to scattered light. A pitch of the spacecraft would be required. -Authors...
Lacustrine-humate model for primary uranium ore deposits, Grants uranium region, New Mexico
C. E. Turner-Peterson
1985, American Association of Petroleum Geologists Bulletin (69) 1990-2020
Two generations of uranium ore, primary and redistributed, occur in fluvial sandstones of the Upper Jurassic Morrison Formation in the San Juan basin; the two stages of ore formation can be related to the hydrologic history of the basin. Primary ore formed soon after Morrison deposition, in the Late Jurassic...
Limnology of nine small lakes, Matanuska-Susitna Borough, Alaska, and the survival and growth rates of rainbow trout
P. F. Woods
1985, Water-Resources Investigations Report 85-4292
The survival and growth rates of rainbow trout (Salmo gairdnieri) were concurrently measured with selected limnological characteristics in nine small (surface area < 25 sq hectometers) lakes in the Matanuska-Susitna Borough. The project goal was to develop empirical models for predicting rainbow trout growth rates from the following variables: total...
Drainage development of the Green River Basin in southwestern Wyoming and its bearing on fish biogeography, neotectonics, and paleoclimates.
W. R. Hansen
1985, Mountain Geologist (22) 192-204
The Upper Green River flows southward out of the Green River Basin through a series of deep canyons across the Uinta Mountains in a course that post-dates the deposition of the Bishop Conglomerate (Oligocene). After the Eocene lakes disappeared, drainage was generally eastward across the present Continental Divide, until the...
Vent evolution and lag breccia formation during the Cape Riva eruption of Santorini, Greece
T. H. Druitt
1985, Journal of Geology (93) 439-454
The 18,500 yr. b.p. Cape Riva (CR) eruption of Santorini vented several km3 or more of magma, generating four eruption units: a basal Plinian fall deposit (CR-A) and three pyroclastic flow deposits (CR-B to CR-D upwards). CR-B and CR-D are welded ignimbrites; CR-C consists predominantly of up to 25 m...
COMPUTER METHOD TO DETECT AND CORRECT CYCLE SKIPPING ON SONIC LOGS.
Douglas C. Muller
1985, Conference Paper, Transactions of the SPWLA Annual Logging Symposium (Society of Professional Well Log Analysts)
A simple but effective computer method has been developed to detect cycle skipping on sonic logs and to replace cycle skips with estimates of correct traveltimes. The method can be used to correct observed traveltime pairs from the transmitter to both receivers. The basis of the method is the linearity...
