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...
The great San Francisco earthquake
R. D. Nason
1981, Earthquake Information Bulletin (USGS) (13) 40-42
Seventy-five years ago on April 18, 1906, the most devastating earthquake in United States history occurred in northern California. This earthquake, which occurred at 5:2 in the morning just as the dawn was breaking, came from rupture of the San Andreas fault from San Juan Bautista (near Hollister) northqard for...
The eastern front of the Sierra Nevada; prone to earthquakes and volcanic eruption
C.D. Rinehart, W. C. Smith
1981, Earthquake Information Bulletin (USGS) (13) 216-224
On Sunday morning, May 25, 1980, the weather at Mammoth Lakes, Calif., was sunny and brisk. Suddenly, just before 9:33 a.m, the world became a jarring, lurching, unstable place. Along the front of the Sierra Nevada, the muffled thunder of rockfalls and avalanches prolonged the confusion of sound and motion...
A lithologic-tectonic framework for the metallogenic provinces of California
J. P. Albers
1981, Economic Geology (76) 765-790
The lithologic-tectonic framework of California developed principally during Mesozoic time when various terranes of oceanic crust and island-arc crust were accreted to older sialic crust, resulting in westward growth of the continent. Emplacement of great batholithic masses of granitoid rocks cutting all these crustal types also took place during the...
Geographic distribution and dispersal of normapolles genera in North America
R.H. Tschudy
1981, Review of Palaeobotany and Palynology (35) 283-314
Normapolles pollen have been found in North America in Cretaceous and Lower Tertiary rocks from the eastern Atlantic Seaboard, the Mississippi embayment region and from the states and provinces from western North America as far north as the District of Mackenzie, Northwest Territories. Previous postulates relating to the Normapolles floral...
Origin of chert grains and a halite- silcrete bed in the Cambrian and Ordovician Whitehall Formation of eastern New York State
D. M. Rubin, G.M. Friedman
1981, Journal of Sedimentary Petrology (51) 69-72
A chert bed in the Whitehall Formation (Cambrian and Ordovician) of eastern New York State is strikingly similar in petrography and inferred origin to Australian and South African silcretes. The chert in the Whitehall, like its Australian and South African counterparts, occurs along...
Dissolution of salt on the east flank of the Permian Basin in the southwestern U.S.A.
K.S. Johnson
1981, Journal of Hydrology (54) 75-93
Hydrogeologic studies prove that natural dissolution of bedded salt occurs at shallow depths in many parts of the Permian Basin of the southwestern U.S.A. This is especially well-documented on the east side of the basin in study areas on the Cimarron River and Elm Fork in western Oklahoma, and on...
Paleogeography and sedimentology of Upper Cretaceous turbidites, San Diego, California
T. H. Nilsen, P. L. Abbott
1981, American Association of Petroleum Geologists Bulletin (65) 1256-1284
Upper Cretaceous (Campanian and Maestrichtian) marine strata of the Rosario Group in the San Diego area include the Point Loma Formation and overlying Cabrillo Formation. These units contain six facies associations: (1) shelf and lagoonal sandstone, (2) slope and basin-plain(?) mudstone, (3) outer-fan lobe sandstone, (4) middle-fan channel-fill sandstone, (5)...
Geology of central Lake Michigan
R. J. Wood, R. A. Paull, C. A. Wolosin, R. J. Friedel
1981, American Association of Petroleum Geologists Bulletin (65) 1621-1632
The geology beneath Lake Michigan between 43°00' and 44°00' N and between 86°30' and 87°40' W is interpreted from a synthesis of 1,700 km of continuous seismic reflection profile data, bathymetry, grab samples, and onshore surface and subsurface information.The continuous seismic reflection profiles and bathymetry provided information for maps of...
Origin and structural implications of upper Miocene rhyolites in Kingston Canyon, Piute County, Utah
P. D. Rowley, T. A. Steven, H. H. Mehnert
1981, Geological Society of America Bulletin (92) 590-602
Kingston Canyon is one of the deepest antecedent canyons in the High Plateaus subprovince of the Colorado Plateaus. Here the East Fork of the Sevier River flows westward transversely across the gently east tilted Sevier Plateau, which is developed on a basin-range fault...
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...
Morphology and processes associated with the accumulation of the fine-grained sediment deposit on the southern New England shelf
David C. Twichell, Charles E. McClennen, Bradford Butman
1981, Journal of Sedimentary Petrology (51) 269-280
A 13,000 km2 area of the southern New England Continental Shelf which is covered by anomalously fine-grained sediment has been surveyed by means of high-resolution, seismic-reflection and side-scan sonar techniques to map its morphology and structure, and a near-bottom instrument system contributed to understanding present activity of the deposit. Seismic-reflection...
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...
Geochemical evidence for modern sediment accumulation on the continental shelf off southern New England
Michael H. Bothner, E.C. Spiker, P. P. Johnson, R.R. Rendigs, P. J. Aruscavage
1981, Journal of Sedimentary Petrology (51) 281-292
An area of fine-grained sediment approximately 170 km x 74 km in size, located in water depths between 60 m and 150 m, south of Martha's Vineyard, Mass., is a site of modern sediment deposition. The 14C ages systematically increase with sediment depth from about 1,300 years B.P. at the...
Economics and coal resource appraisal: strippable coal in the Illinois Basin ( USA)
E. D. Attanasi, E.K. Green
1981, Southern Economic Journal (47) 742-752
Coal-resource appraisals generally describe the location and general characteristics of coal beds. Estimates are made of the average overburden depth (depth of the coal bed below the surface), bed thickness, and perhaps certain chemical properties of the coal [1]. Although such resource compilations represent an important initial step, neither they...
Aeromagnetic map of east-central United States
T.G. Hildenbrand, R.P. Kucks, R. W. Johnson Jr.
1981, Geophysical Investigations Map 948
U.S. Geological Survey...
Ground-water resources and geology of Washington and Ozaukee Counties, Wisconsin
H. L. Young, W. G. Batten
1980, Wisconsin Geological & Natural History Survey Information Circular 38
Population growth is placing increased demands on water supplies in Washington and Ozaukee Counties. Water from three principal aquifers supplies most municipal, industrial, irrigation, residential, and farm water needs in these counties. These are the sand-and-gravel, Niagara, and sandstone aquifers. As much as 15 gallons per minute can be obtained...
Ground-water data for the Salt Basin, Eagle Flat, Red Light Draw, Green River Valley and Presidio Bolson in westernmost Texas
Donald E. White, Joseph S. Gates, James T. Smith, Bonnie J. Fry
1980, Report 259
From October 1971 through October 1974. the U.S. Geological Survey collected ground-water data in the basins in Texas west of the Pecos River drainage area and northwest of the Big Bend country. The basins included are, from east to west: The Presidio Bolson; the Salt Basin; Green River Valley, Eagle...
Residues of environmental pollutants and necropsy data for eastern United States ospreys, 1964-1973
Stanley N. Wiemeyer, T. G. Lamont, L. N. Locke
1980, Estuaries (3) 155-167
Thirty-three ospreys (Pandion haliaetus) that were found dead or moribund in the Eastern United States between 1964 and 1973 were necropsied. The brains and carcasses of 26 of these birds were analyzed for organochlorines. The livers of 18 and the kidneys of 7 were analyzed for selected metals. Most adults...
Atlantic Flyway review: Region V
Chandler S. Robbins
1980, North American Bird Bander (5) 31-36
Four of last year's Maryland stations were either discontinued or banded too few birds to report their results in 1978; these were Cloisters in Baltimore County, Cylburn in Baltimore City, tum Suden Sanctuary in Harford County, and Sandy Point State Park in Anne Arundel County. Banding was severely curtailed at...
