Mineralogic evidence for an impact event at the Cretaceous-Tertiary boundary
B.F. Bohor, E.E. Foord, P.J. Modreski, Don M. Triplehorn
1984, Science (224) 867-869
A thin claystone layer found in nonmarine rocks at the palynological Cretaceous-Tertiary boundary in eastern Montana contains an anomalously high value of iridium. The nonclay fraction is mostly quartz with minor feldspar, and some of these grains display planar features. These planar features are related to specific crystallographic directions in...
Brief comparison of some technological and environmental aspects of large-scale surface and underground mining of oil shale, Piceance Creek Basin, Colorado
G.A. Miller, John R. Dyni, D.R. Dietz
1984, Conference Paper, 17th oil shale symposium proceedings
Comparison of several aspects of surface and underground methods of mining for large-scale oil shale extraction in the Piceance Creek Basin suggests that surface mining techniques may have several advantages over underground methods. For a production level of one million barrels of shale oil per day,...
A seismic refraction study of the Oregon Cascades
Donald S. Leaver, Walter D. Mooney, W.M. Kohler
1984, Journal of Geophysical Research B: Solid Earth (89) 3121-3134
A 275‐km‐long reversed refraction profile in the Oregon Cascades, two shallow earthquakes of magnitude 5 in southern Washington, a shallow earthquake of magnitude 4.6 in northern California, and a previously published analysis of the Bouguer gravity field are used to develop a crustal P wave velocity model for the...
Interlaminated ice-proximal glacimarine sediments in Muir Inlet, Alaska
N.E. Mackiewicz, R.D. Powell, P.R. Carlson, Bruce F. Molnia
1984, Marine Geology (57) 113-147
Muir Inlet in Glacier Bay, Alaska, is a glacial fjord receiving a tremendous volume of sediment annually. The rate of sediment accumulation is greatest proximal to Muir Glacier (about 9 m yr−1) and decreases away from the glacier. The primary sediment sources are meltwater streams discharging at subglacial and ice-marginal...
A field test of a winter pronghorn habitat suitability index model
J.G. Cook, Arthur W. Allen, M.J. Armbruster, L.L. Irwin
1984, Book, Eleventh biennial pronghorn antelope workshop
No abstract available....
Major carbon-14 deficiency in modern snail shells from southern Nevada springs
A.C. Riggs
1984, Science (224) 58-61
Carbon-14 contents as low as 3.3 ± 0.2 percent modern (apparent age, 27,000 years) measured from the shells of snails Melanoides tuberculatus living in artesian springs in southern Nevada are attributed to fixation of dissolved HCO3- with which the shells are in carbon isotope equilibrium. Recognition of the existence of such extreme deficiencies...
Nest spacing, habitat selection, and behavior of waterfowl on Miller Lake Island, North Dakota
John T. Lokemoen, Harold F. Duebbert, David E. Sharp
1984, Journal of Wildlife Management (48) 309-321
The nesting behavior of a concentration of nesting mallards (Anas platyrhynchos) and gadwalls (A. strepera) was studied on a 4.5-ha island in Miller Lake, North Dakota, in 1977. A single 0.59-ha clump of thick shrub contained 225 simultaneously active mallard nests on 10 May. During the peak nesting period, mallard...
Ecological distribution and crude density of breeding birds on prairie wetlands
Harold A. Kantrud, Robert E. Stewart
1984, Journal of Wildlife Management (48) 426-437
Breeding populations of 28 species of wetland-dwelling birds other than waterfowl (Anatidae) were censused on 1,321 wetlands lying within the prairie pothole region of North Dakota. Ecological distribution and two crude measures of relative density were calculated for the 22 commonest species using eight wetland classes. Semipermanent wetlands supported nearly...
Comparative ability of northern pintails, gadwalls, and northern shovelers to metabolize foods
Michael R. Miller
1984, Journal of Wildlife Management (48) 362-370
Feeding trials were used to compare the ability of northern pintails (Anas acuta), gadwalls (A. strepera), and northern shovelers (A. clypeata) to metabolize energy from a turkey starter ration, alfalfa pellets, and common barnyardgrass (Echinochloa crusgalli) seeds. No differences (P > 0.05) were detected among the three species for any...
Cenozoic plate motions and the volcano-tectonic evolution of western Oregon and Washington
Ray E. Wells, David C. Engebretson, P. D. Snavely Jr., R. S. Coe
1984, Tectonics (3) 275-294
A refined northeast Pacific plate-motion model provides a framework for analysis of the Tertiary volcanic and tectonic history of western Oregon and Washington. We examine three possible models for the origin of the allochthonous Paleocene and Eocene oceanic basalt basement of the Coast Range: (1) accretion to the continent of...
Estimating the effect of hunting on annual survival rates of adult mallards
Kenneth P. Burnham, Gary C. White, David R. Anderson
1984, Journal of Wildlife Management (48) 350-361
Management programs for waterfowl populations include rationale for, and establishment of, hunting regulations. These programs rest partially on the results of scientific studies on the effect of harvest rates on annual survival rates. The evidence of this relationship has changed markedly since the mid-1970's, and it is not...
Fossils of hydrothermal vent worms from Cretaceous sulfide ores of the Samail ophiolite, Oman
R.M. Haymon, R.A. Koski, C. Sinclair
1984, Science (223) 1407-1409
Fossil worm tubes of Cretaceous age preserved in the Bayda massive sulfide deposit of the Samail ophiolite, Oman, are apparently the first documented examples of fossils embedded in massive sulfide deposits from the geologic record. The geologic setting of the Bayda deposit and the distinctive mineralogic and textural features of...
Zinc- and Y-group-bearing senaite from St Peters Dome, and new data on senaite from Dattas, Minas Gerais, Brazil
Eugene E. Foord, William N. Sharp, J.W. Adams
1984, Mineralogical Magazine (48) 97-106
A Zn- and Y-group-bearing senaite, formulated as AM21O38 (Pb0.63Na0.46Ba0.11)Σ1.20(Ti14.64Zn1.74Y‒group REE0.70Mn0.38Nb0.20Sn0.03Zr0.03Th0.02)Σ20.9O38, a member of the crichtonite group, is a newly characterized phase associated with murataite at the St Peters Dome...
Cenozoic silicoflagellates from Rockall Plateau, Deep Sea Drilling Project Leg 81
David Bukry
1984, Initial Reports of the D.S.D.P. (81) 547-563
Eocene to Pliocene silicoflagellates from the Rockall Plateau are sparse to moderately abundant and include assem blages at the upper and lower boundaries of the Miocene Series. Relative paleotemperature values for silicoflagellates from the upper Miocene and lower Pliocene at DSDP Hole 552A based on quantitative data are cooler than...
A seismic refraction survey of the Imperial Valley Region, California
Gary S. Fuis, Walter D. Mooney, J. H. Healy, G. A. McMechan, W. J. Lutter
1984, Journal of Geophysical Research B: Solid Earth (89) 1165-1189
The U.S. Geological Survey conducted an extensive seismic refraction survey in the Imperial Valley region of California in 1979. The Imperial Valley is located in the Salton Trough, an active rift between the Pacific and North American plates. Forty shots fired at seven shot points were recorded...
Tests of compensatory vs. additive hypotheses of mortality in mallards
Kenneth P. Burnham, David R. Anderson
1984, Ecology (65) 105-112
Band recovery data from over 410 000 adult Mallards (Anas platyrhynchos) banded in North America between 1950 and 1979 were analyzed to examine the effect of exploitation on annual survival rate. Two extreme hypotheses were defined: completely compensatory, and totally additive, and an explicit mathematical model was presented to...
Geologic evolution, sedimentation, and paleoenvironments of the Angola Basin and adjacent Walvis Ridge: Synthesis of results of Deep Sea Drilling Project Leg 75
Walter E. Dean, W.W. Hay, Jean-Claude Sibuet
1984, Initial Reports of the D.S.D.P. (75) 509-544
The section recovered at Site 530 (Holes 53OA and 530B) consists of eight sedimentary units and one basalt unit. The composition of the basalt recovered in Hole 53OA is distinct from typical mid-ocean ridge basalts (MORBs) but is similar to that of Hawaiian tholeiites and basalt from the central part...
Origin and geochemistry of Cretaceous deep-sea black shales and multicolored claystones, with emphasis on Deep Sea Drilling Project Site 530, southern Angola Basin
Walter E. Dean, M.A. Arthur, D.A.V. Stow
1984, Initial Reports of the D.S.D.P. (75) 819-844
Deep-water sedimentary sequences of mid-Cretaceous age, rich in organic carbon, have been recovered at many DSDP sites in the Atlantic Ocean. Most of these sequences have a marked cyclicity in amount of organic carbon resulting in interbedded multicolored shale, marlstone, and (or) limestone that have cycle periods of 20,000 to...
Models for the deposition of Mesozoic-Cenozoic fine-grained organic-carbon-rich sediment in the deep sea
M.A. Arthur, Walter E. Dean, D.A.V. Stow
1984, Geological Society of London Special Publications (15) 527-560
The widespread occurrence of organic-carbon-rich strata (‘black shales’) in certain portions of Jurassic, Cretaceous and Cenozoic sequences has been well-documented from Deep Sea Drilling Project sites in the Atlantic and Pacific Oceans and from sequences, now exposed on land, originally deposited in the Tethyan ocean. These ancient black shales...
Evaluation of potential embryotoxicity and teratogenicity of 42 herbicides, insecticides, and petroleum contaminants to mallard eggs
David J. Hoffman, Peter H. Albers
1984, Archives of Environmental Contamination and Toxicology (13) 15-27
Results are reported for the embryotoxicity of 42 environmental contaminants applied externally to mallard (Anas platyrhynchos) eggs including crude and refined petroleum, and commercial formulations of herbicides and insecticides. Many of the petroleum pollutants were embryotoxic and moderately teratogenic and had LD50s of 0.3 to 5 μl per egg (∼6–90 μg/g...
Significant unconformities and the hiatuses represented by them in the Paleogene of the Atlantic and Gulf Coastal Province
Joseph E. Hazel Jr., Lucy E. Edwards, Laurel M. Bybell
1984, Book chapter, Interregional unconformities and hydrocarbon accumulation
A biostratigraphic, chronostratigraphic, and magnetostratigraphic model has been calibrated to produce a new time scale for the Paleogene. The model gives the biostratigraphic position and duration represented by significant unconformities in three areas of the Atlantic and Gulf Coastal Province: 1) western and central Alabama; 2) South Carolina; and 3)...
A hierarchical model to organize integrated research on the Okefenokee Swamp
Gregor T. Auble, Bernard C. Patten, R. W. Bosserman, David B. Hamilton
1984, Book chapter, The Okefenokee Swamp: Its natural history, geology, and geochemistry
No abstract available....
Modeling the interrelationship of groundwater and surface water
T. C. Winter
J. L. Schnoor, editor(s)
1984, Book chapter, Modeling of total acid precipitation impacts
No abstract available. ...
Satellite remote sensing: Implications for state and local information systems
D. T. Lauer
1984, Conference Paper, Seminar on the multipurpose cadastre: Modernizing land information systems in North America
No abstract available....
Final report. Habitat management evaluation model project. Phase 1: feasibility
K. Andrews, A.H. Farmer, P.J. Sousa
1984, Report
No abstract available....
