Classification of native vegetation at the Woodworth Station, North Dakota
M.I. Meyer
1985, Prairie Naturalist (17) 167-175
Native prairie areas on the Woodworth Station were sampled, classified, described, and mapped. Transect sites were selectively located along different soil moisture gradients. Data were collected from 292 plots using a modified Braun-Blanquet cover estimation technique. Trees and tall shrubs (over 2 m) were not sampled because they made up...
Water quality in the Blue Creek arm of Lake Eufaula and Blue Creek, Oklahoma, March-October 1978
J. K. Kurklin
1985, Water-Resources Investigations Report 85-4039
Based on samples collected bimonthly for major inorganic and trace elements and monthly for biota and bacteria, water from the Blue Creek arm of Lake Eufaula and Blue Creek is suitable for most uses when compared to water-quality standards or criteria. Concentrations of most chemical constituents gradually increased from spring...
Recent volcano monitoring in Costa Rica
R. Thorpe, G. Brown, H. Rymer, S. Barritt, M. Randal
1985, Earthquake Information Bulletin (USGS) (17) 44-49
The Costa Rican volacno Rincon de la Vieja is loosely but mysteriously translated as the "Old Lady's Corner." It consists of six volcanic centers that form a remote elongated ridge standing some 1300m above the surrounding terraine. Geologically speaking, the Guanacaste province of northern Costa Rica consists of a series...
Use of strontium isotopes to constrain the timing and mode of dolomitization of upper Cenozoic sediments in a core from San Salvador, Bahamas
Peter K. Swart, Joaquin Ruiz, Charles W. Holmes
1985, Geology (15) 262-265
The 87Sr/86Sr ratios and the activity ratios of 234U/238U and 230Th/238U have been measured in dolomites from a 168-m-deep core taken on the island of San Salvador, Bahamas. These data suggest two periods of dolomitization. The first episode dolomitized Miocene age sediments during the latest Miocene, and the second dolomitized the Pliocene portion...
Coupling of ocean bottom seismometers to sediment: Results of tests with the U.S. Geological Survey ocean bottom seismometer
Anne M. Trehu
1985, Bulletin of the Seismological Society of America (75) 271-289
The response of an ocean bottom seismometer (OBS) to a transient pull that excites the natural OBS-sediment coupling resonance can be modeled as a mass-spring-dashpot system in which the resonant frequency and damping are functions of instrument mass and bearing radius and of the physical properties of the sediment (primarily...
Why deposits of longitudinal dunes are rarely recognized in the geologic record
David M. Rubin, Ralph E. Hunter
1985, Sedimentology (32) 147-157
Dunes that are morphologically of linear type, many of which are probably of longitudinal type in a morphodynamic sense, are common in modern deserts, but their deposits are rarely identified in aeolian sandstones. One reason for non-recognition of such dunes is that they can migrate laterally when they are not...
Notes on sedimentation activities calendar year 1984
U.S. Interagency Advisory Committee on Water Data- Subcommittee on Sedimentation
1985, Report
This report is a digest of information furnished by Federal agencies conducting sedimentation investigations. The decision to publish the report was made in 1946, from a proposal by the Chairman of the Federal Interagency River Basin Committee, Subcommittee on Ground Water. The Subcommittee approved the proposal and agreed to issue...
A note on the effect of bottom currents on an ocean bottom seismometer
Anne M. Trehu
1985, Bulletin of the Seismological Society of America (75) 1195-1204
Two three-component ocean bottom seismometers and a current meter were deployed a few hundred meters apart on the southern Blake Plateau off the United States eastern coast to study the effect of near-bottom currents on the background noise level of seismometers. Although analysis of the data is limited somewhat by...
Earthquakes, January-February 1985
W. J. Person
1985, Earthquake Information Bulletin (USGS) (17) 149-152
There were no major earthquakes (7.0-7.9) during the first two months of the year. Argentina reported the first deaths from an earthquake on January 26 and Iran reported on earthquake-related death on February 2. In the United States, there were no casualties or damage reported from earthquakes. ...
A drowned Holocene barrier spit off Cape Ann, Massachusetts
Robert N. Oldale
1985, Geology (13) 375-377
Seismic profiles and bathymetric contours reveal a drowned barrier spit on Jeffreys Ledge off Cape Ann, Massachusetts. Seaward-dipping internal reflectors indicate that a regressive barrier formed during the early Holocene low sea-level stillstand. Preservation of the barrier spit may have been favored by its large size (as much as 20...
Rapid postglacial shoreline changes in the western Gulf of Maine and the Paleo-Indian environment
Robert N. Oldale
1985, American Antiquity (50) 145-150
Rapid shoreline regression and transgression along the western Gulf of Maine between 13,000 and 9000 years B.P. are inferred to have produced a nearshore marine environment low in biologic productivity. Paleo-Indians living near the coast of the Gulf were probably forced to rely on nonmarine resources landward of the late-glacial...
Block Island fault: A Paleozoic crustal boundary on the Long Island platform
Deborah R. Hutchinson, Kim D. Klitgord, R. S. Detrick
1985, Geology (13) 875-879
A major fault cutting through most of the crust can be identified and mapped on the Long Island platform using multichannel seismic reflection profiles and magnetic data. The fault, here called the Block Island fault (BIF), strikes north-northeast, dips westward at low angle, and does not resemble the thin-skinned thrust...
Ice-lubricated gravity spreading of the Olympus Mons aureole deposits
K. L. Tanaka
1985, Icarus (62) 191-206
Gravity sliding and spreading at low strain rates can account for the general morphology and structure of the aureoles and basal scarp of Olympus Mons. Detachment sliding could have occurred around the volcano if either pore-fluid pressures were exceptionally high (greater than 90%) or the rocks had very low resistance...
New York Bight fault
Deborah R. Hutchinson, John A. Grow
1985, Geological Society of America Bulletin (96) 975-989
High-resolution, single-channel and multichannel seismic-reflection profiles in the New York Bight provide 7 crossings of a 50-km-long fault that trends north-northeast for 30 km from its southern end, then bends northeast, and may continue northward beneath Long Island. Displacement, which is consistently down to the west, decreases upsection and suggests...
Deep continental margin reflectors
J. Ewing, J. Heirtzler, M. Purdy, Kim D. Klitgord
1985, Eos, Transactions, American Geophysical Union (66) 448-448
In contrast to the rarity of such observations a decade ago, seismic reflecting and refracting horizons are now being observed to Moho depths under continental shelves in a number of places. These observations provide knowledge of the entire crustal thickness from the shoreline to the oceanic crust on passive margins...
Occurrence and preservation of Eocene squamariacean and coralline rhodoliths: Eau, Tonga
Binyamin Buchbinder, Robert B. Halley
Donald F. Toomey, Matthew H. Nitecki, editor(s)
1985, Book chapter, Paleoalgology: Contemporary research and applications
A widespread rhodolith facies occurs within middle Eocene limestones of Eua, Tonga (Fig. 1). These limestones, first described by Hoffmeister (1932), represent a portion of a broad, early Tertiary platform that developed in the Tonga area prior to disruption and uplift by later Tertiary plate movements (Kroenke and Tongilava 1975)....
Regional setting and new information on some critical geologic features of the West Shasta district, California
J. P. Albers, J.H.C. Bain
1985, Economic Geology (80) 2072-2091
The West Shasta massive sulfide district is in the easternmost of a series of accreted island-arc and oceanic crust terranes that comprise the Klamath Mountains. A sequence of submarine volcanic rocks of predominantly Early Devonian age is the principal component of the island-arc terrane in which the sulfide deposits are...
Total chemical management in photographic processing
Charles Luden, Ronald Schultz
1985, Journal of Imaging Technology (11) 74-82
The mission of the U. S. Geological Survey's Earth Resources Observation Systems (EROS) Data Center is to produce high-quality photographs of the earth taken from aircraft and Landsat satellite. In order to meet the criteria of producing research-quality photographs, while at the same time meeting strict environmental restrictions, a total...
Digital to analog conversion and visual evaluation of Thematic Mapper data
James R. McCord, Douglas R. Binnie, Paul M. Seevers
1985, Journal of Imaging Technology (11) 125-130
As a part of the National Aeronautics and Space Administration Landsat D Image Data Quality Analysis Program, the Earth Resources Observation Systems Data Center (EDC) developed procedures to optimize the visual information content of Thematic Mapper data and evaluate the resulting photographic products by visual interpretation. A digital-to-analog transfer function...
Distribution of copper in heavy-mineral-concentrate samples from the Charlotte 1° x 2° quadrangle, North Carolina and South Carolina
W. R. Griffitts, J. W. Whitlow, K.A. Duttweiler, D. F. Siems, Theodore Botinelly
1985, Open-File Report 84-843-B
No abstract available....
Uranium mineralization in the Smith Lake district of the Grants uranium region, New Mexico.
N.S. Fishman, R. L. Reynolds, J. F. Robertson
1985, Economic Geology (80) 1348-1364
The Mariano Lake and Ruby 1 uranium orebodies, which together comprise much of the uranium ore in the Smith Lake district of the Grants uranium region, New Mexico, occur in sandstones in the lower part of the Brushy Basin Member of the Upper Jurassic Morrison Formation. The orebodies, which are...
Processes on a glacier-dominated coast, Alaska
Bruce F. Molnia
1985, Zeitschrift fur Geomorphologie, Supplementband (57) 141-153
The 500 km long Gulf of Alaska coastline between Cape Suckling and Cape Spencer can be characterized by constant rapid change in an environment of glaciers, stormy climate, high relief, and extreme oceanographic parameters. During a more than 200-year history of observation, bays have completely filled with sediment, new bays...
Comparison of daily and weekly precipitation sampling efficiencies using automatic collectors
L.J. Schroder, R.A. Linthurst, J.E. Ellson, S.F. Vozzo
1985, Water, Air, & Soil Pollution (24) 177-187
Precipitation samples were collected for approximately 90 daily and 50 weekly sampling periods at Finley Farm, near Raleigh, North Carolina from August 1981 through October 1982. Ten wet-deposition samplers (AEROCHEM METRICS MODEL 301) were used; 4 samplers were operated for daily sampling, and 6 samplers were operated for weekly-sampling periods....
Geochemistry of groundwater in Cretaceous sediments of the southeastern coastal plain of eastern Mississippi and western Alabama
Roger W. Lee
1985, Water Resources Research (21) 1545-1556
Geochemical samples of waters along two hydrologic flow paths in four Upper Cretaceous aquifers of northeastern Mississippi and western Alabama indicate similar geochemical evolution of their respective waters. The waters of the Coker, Gordo, and Eutaw-McShan aquifers, noncalcareous sands, increase downgradient in dissolved solids and pH, and are dominated by sodium...
Demonstration of two pulses of Paleogene deformation in the Andes of Peru
D. C. Noble, M. Sebrier, F. Megard, E.H. McKee
1985, Earth and Planetary Science Letters (73) 345-349
New radiometric ages of about 25 m.y. on volcanic materials in a marine intercalation within clastic continental strata of the Upper Moquegua Formation near Caraveli, southern Peru, together with an age of25.3 ± 0.4 m.y obtained by Tosdal et al. from a...
