The central Virginia volcanic-plutonic belt: An island arc of Cambrian(?) age
Louis Pavlides
1981, Professional Paper 1231-A
Pre-Ordovician, probable Early Cambrian metavolcanic and somewhat younger meta-intrusive rocks form a linear belt in the central Virginia Piedmont. On the basis of the geologic and geochemical features of these rocks in the Fredericksburg area, and insofar as this area is representative of the entire belt, it is concluded that...
Bimodal Silurian and Lower Devonian volcanic rock assemblages in the Machias-Eastport area, Maine
Olcott Gates, R. H. Moench
1981, Professional Paper 1184
Exposed in the Machias-Eastport area of southeastern Maine is the thickest (at least 8,000 m), best exposed, best dated, and most nearly complete succession of Silurian and Lower Devonian volcanic strata in the coastal volcanic belt, remnants of which crop out along the coasts of southern New Brunswick, Canada, and...
Coal surface mining reclamation and fish and wildlife relationships in the eastern United States. Vol. I, past findings, the surface Mining Law of 1977 (P.L. 95-87), future planning and management considerations, and information sources
Daniel L. Leedy
1981, FWS/OBS 80/24
Coal surface mining reclamation and fish and wildlife relationships in the eastern United States. Vol. II, opportunities and approaches for fish and wildlife planning and management in coal surface mining, reclamation and postmining land use
Daniel L. Leedy, Thomas M. Franklin
1981, FWS/OBS 80/25
Birds of the St. Croix River valley: Minnesota and Wisconsin
Craig A. Faanes
1981, North American Fauna 73
The St. Croix River Valley encompasses nearly 11,550 km2 in east-central Minnesota and northwestern Wisconsin. A wide range of habitats are available for birds including upland oak, lowland deciduous, maple-basswood, lowland and upland coniferous forests, natural basin wetlands, and grasslands. Situated in the north-central region of the United States, the...
Analysis of stream-aquifer system interrelationships in the Big Blue and Little Blue River basins in Gage and Jefferson Counties, Nebraska
M. J. Ellis
1981, Water-Resources Investigations Report 81-29
Seepage measurements made during the fall of 1978 at 21 sites in the Big Blue River basin and at 35 sites in the Little Blue River basin were used to determine stream gains or losses in 20 drainage areas in the Big Blue River basin and 31 drainage areas in...
Hydrology of Area 33, eastern region, Interior Coal Province, Indiana and Kentucky
David J. Wangsness
1981, Open-File Report 81-423
No abstract available....
Hydrologic conditions at the Idaho National Engineering Laboratory, Idaho, emphasis: 1974-1978
Jack T. Barraclough, Barney D. Lewis, Rodger G. Jensen
1981, Open-File Report 81-526
The Idaho National Engineering Laboratory (INEL) site covers about 890 square miles of the eastern Snake River Plain and overlies the Snake River Plain aquifer. Low concentrations of aqueous chemical and radio-active wastes have been discharged to shallow ponds and to shallow or deep wells on the site since 1952....
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....
Hydrologic and chemical evaluation of the ground-water resources of northwest Elkhart County, Indiana
Thomas E. Imbrigiotta, Angel Martin Jr.
1981, Water-Resources Investigations Report 81-53
A 3-year study in northwest Elkhart County, Indiana, was done to (1) de-fine the general flow and quality of water in the outwash aquifer system, (2) determine if a well field proposed for a site at the Elkhart Municipal Airport would draw leachate from the Himco landfill, and (3) define...
Saline ground-water discharge to the Smoky Hill River between Salina and Abilene, central Kansas
Joe B. Gillespie, Gerald D. Hargadine
1981, Water-Resources Investigations Report 81-43
Saline water discharges from the alluvial aquifer into the Smoky Hill and Solomon Rivers between New Cambria and Sand Springs, Kansas. During relatively stable base flow in 1976-77, the discharge was about 32 cubic feet per second. Chloride concentrations at base flow increased about 800 milligrams per liter in the...
The surficial aquifer in east-central St. Johns County, Florida
Eugene C. Hayes
1981, Water-Resources Investigations Report 81-14
The surficial aquifer, a composite of confined and unconfined water-bearing zones overlying the Miocene Hawthorn Formation, is an important source of water in St. Johns County, Fla. The water from wells open to the surficial aquifer generally meets quality standards recommended by the U.S. Environmental Protection Agency for public water...
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...
