Water-quality data for selected stations in the East Everglades, Florida
Bradley G. Waller
1981, Open-File Report 81-821
The results of water-quality samples collected from April 1978 through April 1980 from three canal stations, four marsh stations, and two ground-water stations within the East Everglades, Dade County, Florida, are tabulated in 37 tables. The major categories of parameters analyzed are field measurements, physical characteristics, macronutrients (carbon, nitrogen, and...
Reconnaissance of the Hot Springs Mountains and adjacent areas, Churchill County, Nevada
Nickolas E. Voegtly
1981, Open-File Report 81-134
A geologic reconnaissance of the Hot Springs Mountains and adjacent areas, which include parts of the Brady-Hazen and the Stillwater-Soda Lake Known Geothermal Resource Areas, during June-December 1975, resulted in a reinterpretation of the nature and location of some Basin and Range faults. In addition, the late Cenozoic stratigraphy has...
Complete Bouguer gravity map of the southern Black Hills: Parts of southwestern South Dakota and eastern Wyoming
T.G. Hildenbrand, R.P. Kucks
1981, Open-File Report 81-760
No abstract available....
Data file: the 1976 Atlantic Margin Coring (AMCOR) Project of the U.S. Geological Survey
Lawrence J. Poppe
Lawrence J. Poppe, editor(s)
1981, Open-File Report 81-239
In 1976, the U.S. Geological Survey conducted the Atlantic Margin Coring Project (AMCOR) to obtain information on stratigraphy, hydrology and water chemistry, mineral resources other than petroleum hydrocarbons, and geotechnical engineering properties at sites widely distributed along the Continental Shelf and Slope of the Eastern United States (Hathaway and others,...
Potentiometric-surface map for the Cretaceous aquifer, Virginia coastal plain, 1978
Herbert T. Hopkins, R. F. Bower, J. M. Abe, J. F. Harsh
1981, Open-File Report 80-965
The Atlantic Coastal Plain of Virginia includes 9,600 square miles--all or part of 40 counties east of the Fall Line. The undifferentiated Cretaceous sediments underlying this area are the most productive and extensive source of ground water, from which large withdrawals have been made over the past 40 years. In...
Aeromagnetic map of the southern Black Hills: Parts of southwestern South Dakota and eastern Wyoming
T.G. Hildenbrand, R.P. Kucks
1981, Open-File Report 81-759
No abstract available....
Seismicity of the lower east rift zone of Kilauea Volcano, Hawaii, 1960 to 1980
Robert Y. Koyanagi, Jennifer S. Nakata, Wilfred R. Tanigawa
1981, Open-File Report 81-984
No abstract available....
Shallow ground-water conditions and vegetation classification, central Volusia County, Florida
Edward P. Simonds Jr., Benjamin F. McPherson, Peter W. Bush
1981, Open-File Report 80-752
In the early 1970's, the Volusia County Council recognized the need to develop new sources of freshwater for future growth and development. County Council, using data from the U.S. Geological Survey and private consultants, concluded that the central wetlands were an optimal area for well-field development. With this in mind,...
Computer simulation of the steady-state flow system of the Tertiary limestone (Floridan) aquifer system in east-central Florida
C. H. Tibbals
1981, Open-File Report 81-681
The predevelopment steady-state ground-water flow system for 13 ,700 square miles of the Tertiary limestone aquifer system (known as the Florida aquifer in Florida) in east-central Florida is simulated by means of a digital computer model. The model results indicate that about 1,900 cubic feet per second recharges the aquifer...
Evaluation of major dike-impounded ground-water reservoirs, Island of Oahu, with a section on flow hydraulics in dike tunnels in Hawaii
Kiyoshi J. Takasaki, John F. Mink
1981, Open-File Report 81-1119
Ground-water reservoirs impounded by volcanic dikes receive a substantial part of the total recharge to ground water on the island of Oahu because they generally underlie the rainiest areas. They accumulate the infiltration from rainfall, store it temporarily, and steadily leak it to abutting basal reservoirs or to streams cutting...
Hard mineral resources around the U.S continental margin
Frank T. Manheim, H.D. Hess
1981, Conference Paper, Proceedings of the Annual Offshore Technology Conference
The territorial waters surrounding the United States contain vast quantities of hard mineral resources. Some, such as sand and gravel in the New York Bight, Beaufort Sea, portions of southern California, and submerged lands near Hawaii are relatively well known and characterized by local need and immediate mining potential with...
Facies changes in the Hatchetigbee Formation in Alabama-Georgia and the Wilcox-Claiborne Group unconformity
T. G. Gibson, Laurel M. Bybell
1981, Gulf Coast Association of Geological Societies Transactions (31) 301-306
No abstract available....
Temporal and spatial variations in suspended matter in continental shelf and slope waters off the north-eastern United States
Michael H. Bothner, Carol M. Parmenter, John D. Milliman
1981, Estuarine, Coastal and Shelf Science (13) 213-234
Seston in waters of Georges Bank originates primarily from biological production and from resuspension of bottom sediments. The concentrations of suspended matter observed on the central shoals are more influenced by storms than by seasonal changes. Winter storms produce highest concentrations of non-combustible material throughout the water column, and summer...
Proterozoic zircon from augen gneiss, Yukon-Tanana Upland, east-central Alaska
John N. Aleinikoff, Cynthia Dusel-Bacon, Helen L. Foster, Kiyoto Futa
1981, Geology (9) 469-473
U-Th-Pb analyses of zircons from an ortho-augen gneiss body in the Yukon-Tanana Upland of east-central Alaska yield strong evidence for the presence of early Proterozoic material in this area. U-Pb data define a chord that intersects concordia at about 2,300 and 345 m.y. We consider two interpretations: (1) the protolith...
Radiometric and paleomagnetic evidence for the Emperor reversed polarity event at 0.46 ± 0.05 M.Y. in basalt lava flows from the eastern Snake River Plain, Idaho
Duane E. Champion, G. Brent Dalrymple, Mel A. Kuntz
1981, Geophysical Research Letters (8) 1055-1058
K-Ar and paleomagnetic data from cores through a sequence of basalt flows in the eastern Snake River Plain provide evidence for a brief (0.005 to 0.01 m.y.) reversal of the geomagnetic field 0.46 ± 0.05 m.y. ago. This reversed polarity event has also been found in sea-floor magnetic anomalies and...
Geodetic measurement of crustal deformation on the San Andreas, Hayward, and Calaveras faults near San Francisco, California
W.H. Prescott, Michael Lisowski, James C. Savage
1981, Journal of Geophysical Research B: Solid Earth (86) 10853-10869
Analysis of a geodetic network of 115 lines crossing the San Andreas, Hayward, and Calaveras faults in the vicinity of San Francisco Bay and measured repeatedly between 1970 and 1980 has revealed details about the accommodation of relative plate motion in this area. The most striking result is that the...
Crustal processes of the Mid-Ocean Ridge
Richard D. Ballard, H. Craig, J. Edmond, M. Einaudi, R. Holcomb, H.D. Holland, C.A. Hopson, B.P. Luyendyk, K. Macdonald, J. Morton, J. Orcutt, N. Sleep
1981, Science (213) 31-40
Independent geological and geophysical investigations of the Mid-Ocean Ridge system have begun to focus on the nature of the magma chamber system underlying its central axis. Thermal models predict the existence of a steady-state chamber beneath a thin crustal lid ranging in thickness from 2 to 13...
State of stress and intraplate earthquakes in the United States
Mark D. Zoback, Mary Lou Zoback
1981, Science (213) 96-104
Recently compiled data on the state of stress have been used to define stress provinces in the conterminous United States in which the orientation and relative magnitude of the horizontal principal stresses are fairly uniform. The observed patterns of stress constrain mechanisms for generating intraplate lithospheric stresses....
Overview of Mount St. Helens volcanic eruption
Robert I. Tilling
1981, Conference Paper, Proceedings of SPIE - The International Society for Optical Engineering
Dormant since 1857, Mount St. Helens Volcano in southwestern Washington stirred from its repose to erupt on March 27, 1980, following a week of premonitory earthquake activity. The eruption was the first in the conterminous United States since the 1914-1921 activity of Lassen Peak, California. The eruptive activity through May...
Permian and Triassic rocks near Quinn River Crossing, Humboldt County, Nevada
Keith B. Ketner, Bruce R. Wardlaw
1981, Geology (9) 123-126
Permian and Triassic rocks near Quinn River Crossing, Humboldt County, Nevada, consist of four structural blocks: (1) a Lower Permian volcanic block; (2) a Permian(?) chert-arenite block; (3) a Lower Permian limestone block; and (4) a Permian and Triassic block. The contacts between the Permian volcanic block and the others...
Smooth seaward-dipping horizons — An important factor in sea-floor stability?
B.A. McGregor
1981, Marine Geology (39) M89-M98
Mass movement has influenced in varying degrees the morphology of the United States east coast continental margin seaward of the Baltimore Canyon trough as revealed by detailed geophysical studies using high-resolution 3.5-kHz, and seismic reflection data. Each of three areas studied is along the slope within a distance of 225...
Deep structure and evolution of the continental margin off the eastern United States
J. A. Grow, R. E. Sheridan
1981, Oceanologica Acta (4) 11-19
Seismic stratigraphic characteristics of upper Louisiana continental slope: an area east of Green Canyon
Arnold H. Bouma, Mary H. Feeley, Jack L. Kindinger, Charles E. Stelting, Thomas W.C. Hilde
1981, Conference Paper, Thirteenth annual Offshore Technology Conference: 1981 proceedings
A high-resolution seismic reflection survey was conducted in a small area of the upper Louisiana Continental Slope known as Green Canyon Area. This area includes tracts 427, 428, 471, 472, 515, and 516, that will be offered for sale in March 1982 as part of Lease Sale 67.The sea floor...
Geochemical evidence for a Brooks Range mineral belt, Alaska
S.P. Marsh, J. B. Cathrall
1981, Journal of Geochemical Exploration (15) 367-380
Geochemical studies in the central Brooks Range, Alaska, delineate a regional, structurally controlled mineral belt in east—west-trending metamorphic rocks and adjacent metasedimentary rocks. The mineral belt extends eastward from the Ambler River quadrangle to the Chandalar and Philip Smith quadrangles, Alaska, from 147° to 156°W. longitude, a distance of more...
Coincident sediment slump/clathrate complexes on the U.S. Atlantic continental slope
G. Carpenter
1981, Geo-Marine Letters (1) 29-32
High-resolution seismic reflection data recorded on the continental slope off the east coast of the United States have revealed instances of sediment mass movement (slumps) which appear to occur above clathrate accumulations. The slumping is believed to be related to the liberation of free gas by clathrate decomposition and consequent...
