Use of packrat middens to determine rates of cliff retreat in the eastern Grand Canyon, Arizona
Kenneth L. Cole, Larry Mayer
1982, Geology (10) 597-599
Packrat midden data can be used to calculate rates of cliff retreat by relating midden age to the distance between cliff face and midden. Regression analysis using 14 radiocarbon-dated packrat deposits from the Mississippian Redwall Limestone in the eastern Grand Canyon suggests that the Redwall has been retreating at an...
The Georges Bank monitoring program: analysis of trace metals in bottom sediments
Michael H. Bothner
1982, Report
No abstract available....
Iridium abundance measurements across the Cretaceous/Tertiary boundary in the San Juan and Raton Basins of northern New Mexico
C. J. Orth, J. S. Gilmore, J.D. Knight, R.H. Tschudy, C. L. Pillmore, James E. Fassett
1982, GSA Special Papers (190) 423-433
During the past year we have been measuring trace element abundances and searching for anomalously high iridium (Ir) concentrations in continental sedimentary rocks that span the Cretaceous-Tertiary boundary in the Raton and San Juan Basins of northern New Mexico and southern Colorado. Using neutron activation and radiochemical separations, we have...
Observations of strain accumulation across the San Andreas fault near Palmdale, California, with a two-color geodimeter
J. O. Langbein, Mark F. Linker, Art McGarr, L.E. Slater
1982, Science (218) 1217-1219
Two-color laser ranging measurements during a 15-month period over a geodetic network spanning the San Andreas fault near Palmdale, California, indicate that the crust expands and contracts aseismically in episodes as short as 2 weeks. Shear strain parallel to the fault has accumulated monotonically since November 1980,...
Triggering of large earthquakes by magma-chamber inflation, Izu Peninsula (Japan)
Wayne R. Thatcher, James C. Savage
1982, Geology (10) 637-640
A close spatial and temporal association between three aseismic uplift episodes and subsequent large (M ≈ 7) earthquakes on the Izu Peninsula, Japan, suggests a causal relation. Quaternary geology, as well as studies by other workers, indicates a volcanic origin for the observed uplift, and we use a simple inflation...
Uranium in spring water and bryophytes at basin creek in central idaho
H.T. Shacklette, J. A. Erdman
1982, Journal of Geochemical Exploration (17) 221-236
Arkosic sandstones and conglomerates of Tertiary age beneath the Challis Volcanics of Eocene age at Basin Creek, 10 km northeast of Stanley, Idaho, contain uranium-bearing vitrainized carbon fragments. The economic potential of these sandstones and conglomerates is currently being assessed. Springs abound at the contacts of rock units, and water...
Subsurface valleys and geoarcheology of the eastern Sahara revealed by shuttle radar
J.F. McCauley, G. G. Schaber, C. S. Breed, M. J. Grolier, C.V. Haynes, B. Issawi, C. Elachi, R. Blom
1982, Science (218) 1004-1020
The shuttle imaging radar (SIR-A) carried on the space shuttle Columbia in November 1981 penetrated the extremely dry Selima Sand Sheet, dunes, and drift sand of the eastern Sahara, revealing previously unknown buried valleys, geologic structures, and possible Stone Age occupation sites. Radar responses from bedrock and...
Auditory evoked potentials in the West Indian Manatee (Sirenia: Trichechus manatus)
Theodore H. Bullock, Thomas J. O'Shea, Michael C. McClune
1982, Journal of Comparative Physiology A (148) 547-554
Potentials evoked by clicks and tone pips were recorded by fine wires inserted extracranially in four West Indian manatees (Trichechus manatus) in air. Sounds were delivered via padded ear phones. Averaging a few thousand trials at 20/s reveals early peaks at N5.4 (‘vertex’ negativity to a frontal reference, at 5.4 ms),...
U-Pb ages of uranium ores in the Churchrock uranium district, New Mexico
K.R. Ludwig, Bruce Rubin, Neil Fishman, Richard L. Reynolds
1982, Economic Geology (77) 1942-1945
No abstract available....
The United Kingdom-Caltech asteroid survey
S. J. Bus, E. F. Helin, R. S. Dunbar, Eugene Merle Shoemaker, J. Dawe, J. Barrow, M. Hartley, D. Morgan, K. Russell, A. Savage
1982, Book chapter, Reports of Planetary Programs, 1982
No abstract available....
Status of Alaska sea otter populations and developing conflicts with fisheries
1982, Conference Paper, Transactions of the 47th North American wildlife and national resources conference
No abstract available....
Use and interpretation of statistics in wildlife journals
Thomas C. Tacha, William D. Warde, Kenneth P. Burnham
1982, Wildlife Society Bulletin (10) 355-362
Use and interpretation of statistics in wildlife journals are reviewed, and suggestions for improvement are offered. Populations from which inferences are to be drawn should be clearly defined, and conclusions should be limited to the range of the data analyzed. Authors should be careful to avoid improper methods...
Magnitude > or = 6.0 earthquakes
Henry Spall, editor(s)
1982, Earthquake Information Bulletin (USGS) (14) 192-195
No abstract available....
Ice sculpture in the Martian outflow channels
Baerbel K. Lucchitta
1982, Journal of Geophysical Research B: Solid Earth (87) 9951-9973
Many landforms in Martian outflow channels have characteristics that suggest sculpture by glaciers, ice streams, or ice sheets. Viking Orbiter and terrestrial satellite images were examined at similar resolution to compare features of the Martian outflow channels to features produced by the movement of ice on earth. Many resemblances were...
Natural groundwater recharge in an upland area of central North Dakota, U.S.A.
B.W. Rehm, S.R. Moran, G.H. Groenewold
1982, Journal of Hydrology (59) 293-314
The magnitude of groundwater recharge to coal aquifers in a 150-km2 area in west-central North Dakota was determined using three separate approaches: (1) the net water level rise in water-table wells; (2) calculations of the fluid flux between nested piezometers, using the Darcy equation and measured values of hydraulic conductivity and...
Growth and condition of bluegills in Wisconsin lakes: Effects of population density and lake pH
J.G. Wiener, W.R. Hanneman
1982, Transactions of the American Fisheries Society (111) 761-767
Growth and condition of bluegills Lepomis macrochirus from five acidic lakes (pH 5.1–6.0) and six circumueutral lakes (pH 6.7–7.5) in northern Wisconsin were compared. Although mean condition factors and mean back‐calculated total lengths at ages 1 to 4 varied significantly among lakes, the differences were not related to lake pH....
Gas exchange characteristics of the submerged aquatic Crassulacean acid metabolism plant, Isoetes howellii
Jon E. Keeley, G. Bowes
1982, Plant Physiology (70) 1455-1458
The submerged aquatic plant Isoetes howellii Engelmann possesses Crassulacean acid metabolism (CAM) comparable to that known from terrestrial CAM plants. Infrared gas analysis of submerged leaves showed Isoetes was capable of net CO2 uptake in both light and dark. CO2 uptake rates were a function of CO2 levels in the medium. At 2,500 microliters CO2 per liter (gas...
Active geologic processes in Barrow Canyon, northeast Chukchi Sea
Stephen Eittreim, Arthur Grantz, Jonathan Greenberg
1982, Marine Geology (50) 61-76
Circulation patterns on the shelf and at the shelf break appear to dominate the Barrow Canyon system. The canyon's shelf portion underlies and is maintained by the Alaska Coastal Current (A.C.C.), which flows northeastward along the coast toward the northeast corner of the broad Chukchi Sea. Offshelf and onshelf advective...
Susitna Hydroelectric Project: terrestrial environmental workshop and preliminary simulation model
Robert R. Everitt, Nicholas C. Sonntag, Gregory T. Auble, James E. Roelle, William Gazey
1982, Report
The technical feasibility, economic viability, and environmental impacts of a hydroelectric development project in the Susitna River Basin are being studied by Acres American, Inc. on behalf of the Alaska Power Authority. As part of these studies, Acres American recently contracted LGL Alaska Research Associates, Inc. to coordinate the terrestrial...
Degradation of phenolic contaminants in ground water by anaerobic bacteria: St. Louis Park, Minnesota
G. G. Ehrlich, D.F. Goerlitz, E.M. Godsy, M. F. Hult
1982, Ground Water (20) 703-710
Coal-tar derivatives from a coal-tar distillation and wood-treating plant that operated from 1918 to 1972 at St. Louis Park, Minnesota contaminated the near-surface ground water. Solutions of phenolic compounds and a water-immiscible mixture of polynuclear aromatic compounds accumulated in wetlands near the plant site and entered the aquifer. The concentration...
Technical manual for estimating low-flow characteristics of Pennsylvania streams
Herbert N. Flippo Jr.
1982, Water Resources Bulletin 15
No abstract available....
Organic geochemistry and pore water chemistry of sediments from Mangrove Lake, Bermuda
Patrick G. Hatcher, Bernd R. T. Simoneit, F.T. MacKenzie, A.C. Neumann, D.C. Thorstenson, S.M. Gerchakov
1982, Organic Geochemistry (4) 93-112
Mangrove Lake, Bermuda, is a small coastal, brackish-water lake that has accumulated 14 m of banded, gelatinous, sapropelic sediments in less than 104 yr. Stratigraphic evidence indicates that Mangrove Lake's sedimentary environment has undergone three major depositional changes (peat, freshwater gel, brackish-water gel) as a result of sea level changes. The...
Modern sedimentary environments on the Rhode Island inner shelf, off the eastern United States
Harley J. Knebel, Sally W. Needell, Charles J. O’Hara
1982, Marine Geology (49) 241-256
Analyses of side-scan sonar records along with previously published bathymetric, textural and subbottom data reveal the sedimentary environments on the inner Continental Shelf south of Narragansett Bay, Rhode Island. The bottom topography in this area is characterized by a broad central depression bordered by shallow, irregular sea floor on the...
Characterization of dissolved organic materials in surface waters within the blast zone of Mount St Helens, Washington
Diane M. McKnight, W. E. Pereira, M.L. Ceazan, Robert C. Wissman
1982, Organic Geochemistry (4) 85-92
After the May 18, 1980, eruption of Mount St Helens, the concentration of dissolved organic material in surface waters near the volcano increased significantly as a result of the destruction of the surrounding conifer forest. Low molecular weight organic compounds identified in...
Age-class determination of canvasbacks
Jerome R. Serie, David L. Trauger, Harold A. Doty, David E. Sharp
1982, Journal of Wildlife Management (46) 894-904
A technique was developed to distinguish yearling from adult canvasbacks (Aythya valisineria) in the field during spring on the basis of white flecking on the distal ends of selected wing feathers. Covert feathers from adults had well-defined vermiculation patterns whereas feathers from yearlings lacked such markings. These age-related characters were...
