Mercury residues in pintails breeding in North Dakota
Gary L. Krapu, G.A. Swanson, H.K. Nelson
1973, Journal of Wildlife Management (37) 395-399
Livers of 42 pintail hens (Anas acuta) breeding in eastern North Dakota during the spring and early summer of 1969 and 1970 were analyzed for total mercury by the neutron activation technique. Mercury content on a...
Analysis of radiotracking data using digitized habitat maps
D.S. Gilmer, S.E. Miller, L.M. Cowardin
1973, Journal of Wildlife Management (37) 404-409
A method is described that provides a rapid and accurate analysis of habitat used by radio-equipped animals. The digitizer (basically an X-Y plotter in reverse) converts maps into digital form by describing each habitat unit as a polygon that closely approximates the actual shape of the unit. The coordinates of...
Hydraulics of sheetlike solution cavities
Gerald K. Moore
1973, Groundwater (11) 4-11
The sheetlike solution cavities that supply water to most wells in central Tennessee are 100 to 2,500 feet wide and less than 0.2 inch high. These dimensions have a scale similar to those in Hele-Shaw models. Both logical and mathematical evidence indicate laminar ground-water flow, except close to pumping wells....
Thermochemical approximations for sulfosalts
James R. Craig, Paul B. Barton Jr.
1973, Economic Geology (68) 493-506
Most sulfosalts may be regarded as intermediate phases on joins between simple sulfide components (e.g., all lead sulfbismuthinides lie on the PbS-Bi 2 S 3 join). Many of the structures are characterized by subunits whose individual structures are similar to those of the component simple sulfides (e.g., galena-like and stibnite-like layers in the lead...
Potassium-Argon ages for minerals from the Ross of Mull, Argyllshire, Scotland
R. D. Beckinsale, J. D. Obradovich
1973, Scottish Journal of Geology (9) 147-156
Sixteen K-Ar ages for samples of biotite and amphibole from the Ross of Mull and analytical data for the standards Bern 4M and W1 are presented. Ages determined for biotite and amphibole samples from the Caledonian pluton average 423 ± 4 m.y. and 416 ± 4 m.y. respectively. Field observations...
Geochemical and fluid zonation at Copper Canyon, Lander County, Nevada
Ted G. Theodore, J. Thomas Nash
1973, Economic Geology (68) 565-570
No abstract available....
The bearing of the new Late Cambrian monoplacophoran genus Knightoconus upon the origin of the Cephalopoda
Ellis L. Yochelson, Rousseau H. Flower, Gerald F. Webers
1973, Lethaia (6) 275-309
Knightoconus, a new genus of the Hypseloconidae (Mollusca: Monoplacophora) from rocks of early Franconian age in Antarctica, is multiseptate. The multiple septa are a criticàl feature to be expected in a form ancestral to cephalopods. Fossil cephalopods, however, invariably have a siphuncle as well as septa; some gastropods, some hyolithids,...
The bearing of the new Late Cambrian monoplacophoran genus Knightoconus upon the origin of the Cephalopoda
1973, Lethaia (6) 275-309
Knightoconus, a new genus of the Hypseloconidae (Mollusca: Monoplacophora) from rocks of early Franconian age in Antarctica, is multiseptate. The multiple septa are a criticàl feature to be expected in a form ancestral to cephalopods. Fossil cephalopods, however, invariably have a siphuncle as well as septa; some gastropods, some hyolithids,...
Ground water and geology of Baraga County, Michigan
C. J. Doonan, J.R. Byerlay
1973, Water Investigation 11
Most wells In Baraga County obtain water from beds of sand and gravel in morainal and lakebed deposits or from the Jacobsville Sandstone. Yields of wells range from a few to as much as 115 gallons per minute, but most wells probably yield less than 10 gpm. Large areas, where...
Interpretation of a high-grade Precambrian terrane in northern Idaho
Sandra H. B. Clark
1973, Geological Society of America Bulletin (84) 1999-2004
A terrane of high-grade metamorphic rocks in northern Idaho and northeastern Washington is almost completely surrounded by low-grade rocks of the Precambrian Belt Supergroup. The high-grade terrane includes both Belt and pre-Belt rocks. Four events of folding and metamorphism occurred in the high-grade terrane. The first three events may have...
Radiometric ages of intrusive rocks in the Little Belt Mountains, Montana
Richard F. Marvin, Irving J. Witkind, William R. Keefer, Harald H. Mehnert
1973, Geological Society of America Bulletin (84) 1977-1986
Radiometric ages indicate that most, if not all, of the major intrusions in the Little Belt Mountains, central Montana, were emplaced during the Eocene epoch, between 48 and 54 m.y. ago. In the Hughesville area, igneous activity continued, or was episodic until 42 m.y. ago. As a result of the...
Origin of andesitic and granitic magmas in the northern Sierra Nevada, California
Anna Hietanen
1973, Geological Society of America Bulletin (84) 2111-2118
The early magmas of the northern Sierra Nevada, calc-alkaline andesite of island-arc type and its derivatives, all low in potassium, were generated during the Devonian(?) period, possibly along an eastward-dipping sub-duction zone. These magmas could have been derived from mantle peridotite of the continental plate by introduction of water from...
Petrogenesis of the Superstition-Superior volcanic area as inferred from strontium- and oxygen-isotope studies
John S. Stuckless, James R. O’Neil
1973, Geological Society of America Bulletin (84) 1987-1997
Apparent initial Sr87/Sr86 ratios of five ash-flow tuffs (0.7063 to 0.7139) and several mafic to silicic lavas (0.7055 to 0.7131) indicate that the magmas were derived below the base of the Precambrian granitic crust (0.7231 to 1.0906). Liquidus compositions in the system Q-Or-Ab-H2O and oxygen-isotope geother-mometry suggest that the silicic magmas...
Organochlorine pesticides and polychlorinated biphenyls in black duck eggs from the United States and Canada--1971
J. R. Longcore, B.M. Mulhern
1973, Pesticides Monitoring Journal (7) 62-66
Black duck (Anas rubripes) eggs were collected in 1971 from the Northeastern United States and Canada. All 61 eggs analyzed contained DDE residues; the mean DDE residues for States and Provinces ranged from 0.09 to 5.94 ppm on a wet-weight basis, with.mean concentrations exceeding 1.0 ppm in eggs from Maine,...
Mapping of the 1973 Mississippi River floods from the Earth Resources Technology Satellite (ERTS)
Morris Deutsch, F. H. Ruggles, Philip Guss, Edward Yost
1973, Conference Paper, Remote sensing and water resources management
On March 31, and May 4 and 5, 1973, the first Earth Resources Technology Satellite (ERTS-1) obtained multispectral scanner imagery over the Mississippi River below St. Louis, Missouri. The river was in flood, and the ERTS data provided the first opportunity for regional synoptic mapping of the extent of flooding...
Referees and the publications crisis
Frank T. Manheim
1973, Eos, Earth and Space Science News (54) 532-537
Routine refereeing by peers of manuscripts submitted to scholarly journals is a logical and effective device that can obviate ‘crankiness, irrelevance and gross incompetence’ [Ziman, 1970a] on the one hand and minimize editorial arbitrariness on the other. As reviewed by Zuckerman and Merton [1971], the device has historical roots that extend back...
Fordilla troyensis Barrande: The oldest known pelecypod
J. Pojeta Jr., B. Runnegar, J. Kriz
1973, Science (180) 866-868
Specimens of the small bivalved animal Fordilla troyensis Barrande from New York State show that this fossil is the oldest known pelecypod mollusk and not a conchostracan arthropod. This finding extends the range of the class Pelecypoda backward in time from the Early Ordovician (about 495 million years ago)...
Lonar Lake, India: An impact crater in basalt
K. Fredriksson, A. Dube, D.J. Milton, M.S. Balasundaram
1973, Science (180) 862-864
Discovery of shock-metamorphosed material establishes the impact origin of Lonar Crater. Coarse breccia with shatter coning and microbreccia with moderately shocked fragments containing maskelynite were found in drill holes through the crater floor. Trenches on the rim yield strongly shocked fragments in which plagioclase has melted and vesiculated, and bombs...
Obsidian hydration dates glacial loading?
I. Friedman, K. L. Pierce, J. D. Obradovich, W.D. Long
1973, Science (180) 733-734
Three different groups of hydration rinds have been measured on thin sections of obsidian from Obsidian Cliff, Yellowstone National Park, Wyoming . The average thickness of the thickest (oldest) group of hydration rinds is 16.3 micrometers and can be related to the original emplacement of the flow 176,000 years ago...
Flooded area of Stillwater, Minnesota
C.W. Saboe
1973, Report
No abstract available....
Isotopic and paleontologic evidence for correlating three volcanic sequences in the Maine coastal volcanic belt
Douglas G. Brookins, Jean M. Berdan, David B. Stewart
1973, Geological Society of America Bulletin (84) 1619-1628
The correlation of the Castine Volcanics, the Thorofare Andesite–Vinalhaven Rhyolite sequence, and the Cranberry Island Series of Shaler (1889), suggested by their similar lithologies, appearance, and structural histories, is supported by the results of Rb-Sr whole-rock isotopic analyses and by the faunal assemblages from old and new fossil localities in...
Staurolite zone Caradoc (Middle-Late Ordovician) age, Old World province brachiopods from Penobscot Bay, Maine: Discussion
Robert B. Neuman
1973, Geological Society of America Bulletin (84) 1829-1830
No abstract available....
Pebble segregation and bed lenticularity in wave-worked versus alluvial gravel
H. Edward Clifton
1973, Sedimentology (20) 173-187
Two aspects of bedding may permit visual discrimination between wave-worked and alluvial gravel. Pebbles in gravel worked by waves tend to be better segregated into discrete beds than those in alluvial deposits, and bedding in wave-worked gravel tends to be more laterally regular, or less lenticular, than that in stream...
Petrology of the Vulcan Peak alpine-type peridotite, southwestern Oregon
Glen R. Himmelberg, Robert Ahlberg Loney
1973, Geological Society of America Bulletin (84) 1585-1600
The alpine-type peridotite in the area of Vulcan Peak, Oregon, is part of the larger Josephine ultramafic complex in the Klamath Mountains geologic province. Partially serpentinized, foliated harzburgite with 15 to 30 percent orthopyroxene makes up approximately 90 percent of the body. The remaining 10 percent is dunite that occurs...
Territorial behavior, pesticides, and the population ecology of red-shouldered hawks in central Maryland, 1943-1971
Charles J. Henny, F. C. Schmid, Elwood M. Martin, L. L. Hood
1973, Ecology (54) 545-554
A breeding population of red—shouldered hawks (Buteo lineatus) along the Patuxent River in central Maryland was studied during the interval 1943—71. Numbers of breeding pairs remained unchanged or increased on the PWRC (Patuxent Wildlife Research Center) and an adjoining area where habibat was not altered. A reduction in breeding pairs...
