Hydrochemistry of the South Coastal Plain Aquifer System of Puerto Rico and its relation to surface-water recharge
Fernando Gomez-Gomez
Fernando Gomez-Gomez, Vicente Quinones-Aponte, A.I. Johnson, editor(s)
1990, Conference Paper, Proceedings of the International Symposium on Tropical Hydrology
Natural occurrence of silicon carbide in a diamondiferous kimberlite from Fuxian
I. Leung, W. Guo, I. Friedman, J. Gleason
1990, Nature (346) 352-354
Considerable debate surrounds the existence of silicon carbide in nature, mostly owing to the problem of possible contamination by man-made SiC. Recently, Gurney1 reviewed reports of rare SiC inclusions in diamonds, and noted that SiC can only be regarded as a probable rather than proven cogenetic mineral. Here we report our...
Midwestern Holocene paleoenvironments revealed by floodplain deposits in northeastern Iowa
C. A. Chumbley, R. G. Baker, E. Arthur Bettis III
1990, Science (249) 272-274
Pollen analysis of pond deposits in the upper reaches of a stream from northeastern Iowa, an area beyond the last glacial margin, provides a nearly complete record of vegetational changes during the last 12.5 thousand years. Sixty-one radiocarbon dates provide good chronological control. Spruce forest was replaced by deciduous forest...
Liquefaction and foundation failure of Chevron oil and gasoline tanks at Moss Landing, California
Martitia Tuttle, Patience Cowie, John Tinsley, Michael Benett, John Berrill
1990, Geophysical Research Letters (17) 1797-1800
Liquefaction of gray, coarse‐ to medium‐grained, esturine sand during the October 17, 1989 Loma Prieta (Ms=7.1) earthquake led to foundation failures of oil and tanks at the Chevron Marine Station at Moss Landing located about 25 km south‐southeast of the epicenter. Differential settlement of the foundations resulted in 1° to...
Polymerase chain reaction (PCR) amplification of a nucleoprotein gene sequence of infectious hematopoietic necrosis virus
C.K. Arakawa, R.E. Deering, K.H. Higman, K.H. Oshima, P.J. O’Hara, J. R. Winton
1990, Diseases of Aquatic Organisms (8) 165-170
The polymerase chain reaction [PCR) was used to amplify a portion of the nucleoprotein [NI gene of infectious hematopoietic necrosis virus (IHNV). Using a published sequence for the Round Butte isolate of IHNV, a pair of PCR pnmers was synthesized that spanned a 252 nucleotide region of the N gene...
Recent trends in counts of migrant hawks from northeastern North America
Kimberly Titus, Mark R. Fuller
1990, Journal of Wildlife Management (54) 463-470
Using simple regression, pooled-sites route-regression, and nonparametric rank-trend analyses, we evaluated trends in counts of hawks migrating past 6 eastern hawk lookouts from 1972 to 1987. The indexing variable was the total count for a season. Bald eagle (Haliaeetus leucocephalus), peregrine falcon (Falco peregrinus), merlin (F. columbarius), osprey (Pandion haliaetus),...
Habitat use by postfledging American black ducks in Maine and New Brunswick
Catherine Frazer, Jerry R. Longcore, Daniel G. McAuley
1990, Journal of Wildlife Management (54) 451-459
We examined habitat use by 112 postfledging American black ducks (Anas rubripes) in eastern Maine and southwestern New Brunswick from September through early December of 1985, 1986, and 1987. Ducks were captured on Moosehorn National Wildlife Refuge (NWR), Maine. Palustrine Emergent Wetland was the most preferred habitat type. Riverine habitats...
Using 222Rn to examine groundwater/surface discharge interaction in the Rio Grande de Manati, Puerto Rico
K. Kelly Ellins, A. Roman-Mas, A. Lee
1990, Journal of Hydrology (115) 319-341
222Rn was used in the karst drainage basin of the Rio Grande de Manati in Puerto Rico to study groundwater/surface flow relationships. Locations of groundwater influx along two sections of the Rio Grande de Manati were identified. The 222Rn measurements were used together with stream discharge data in a mass balance...
Brunhes chron excursion/polarity episode recorded during the late pleistocene, Albuquerque Volcanoes, New Mexico, USA
J. W. Geissman, L. Brown, B. D. Turrin, L. D. McFadden, S. S. Harlan
1990, Geophysical Journal International (102) 73-88
All basaltic lava flows of the Albuquerque Volcanoes (lat.: 35.2°N, long.: 253.2°E), Albuquerque-Belen Basin, New Mexico, record a short excursion/polarity episode. K-Ar isotopic age determinations (weighted average: 155 ± 47 ka) and evaluation of soil profiles on flow surfaces suggest the late Pleistocene (circa between 250 and 80 ka) as the...
Winter use of douglas-fir forests by Blue Grouse in Colorado
Brian S. Cade, Richard W. Hoffman
1990, Journal of Wildlife Management (54) 471-479
We studied winter use of Douglas-fir (Pseudotsuga menziesii) forests by blue grouse (Dendragapus obscurus) from 1981 to 1983 at 2 study areas in northcentral Colorado. Comparisons of used and available stands indicated grouse were concentrated spatially, but there were no consistent differences related to basal area of tree species, conifer...
Source characteristics of the Loma Prieta, California, Earthquake of October 18, 1989 from global digital seismic data
George Choy, John Boatwright
1990, Geophysical Research Letters (17) 1183-1186
Displacement, velocity and acceleration records of P and SH body waves recorded at teleseismic distances are analysed to determine the static and dynamic source parameters of the Loma Prieta, California earthquake of October 18, 1989 (mb 6.6, Ms 7.1). Three distinct bursts of energy corresponding to three subevents can be recognized in most...
Preliminary velocity and resistivity models of the Loma Prieta Earthquake region
Donna Eberhart-Phillips, Victor F. Labson, William D. Stanley, Andrew J. Michael, Brian D. Rodriguez
1990, Geophysical Research Letters (17) 1235-1238
A preliminary three-dimensional velocity model of the Loma Prieta epicentral region in the Santa Cruz Mountains of California has been derived using raypaths from aftershocks recorded by the U.S.G.S. seismic network. In addition, a magnetotelluric sounding profile was completed prior to the earthquake and a two-dimensional resistivity model computed. The...
Seismomagnetic effect generated by the October, 1989, ML, 7.1 Loma Prieta, California, Earthquake
R.J. Mueller, M.J.S. Johnston
1990, Geophysical Research Letters (17) 1231-1234
A differentially connected array of proton magnetometers operated within the epicentral region of the October 18, 1989, ML 7.1 Loma Prieta earthquake for 12 years from 1974 to 1986. The closest magnetometer station was located 7.3 km from the epicenter of the earthquake and within 3 km of the site where...
Aftershock slip behavior of the 1989 Loma Prieta, California Earthquake
David H. Oppenheimer
1990, Geophysical Research Letters (17) 1199-1202
An analysis of 745 aftershocks of the M7.1 Loma Prieta earthquake of 17 October, 1989 reveals a wide variety of focal mechansims. At the northwestern end of the aftershock zone earthquakes that apparently occurred off the main rupture plane exhibit mechanisms with predominantly reverse slip on planes nearly parallel to the...
Remagnetization and northward translation of Mesozoic red chert from Cedros Island and the San Benito Islands, Baja California, Mexico
Jonathan T. Hagstrum, R.L. Sedlock
1990, Geological Society of America Bulletin (102) 983-991
Samples for paleomagnetic analysis were collected from red radiolarian ribbon chert in a Franciscan-like subduction complex (Western Baja terrane) exposed along the western margin of the Baja California Peninsula. A 40-m-thick section of chert was sampled on Cedros Island, and a 30-m-thick and two smaller sections of chert were sampled...
New Washakiin primates (Omomyidae) from the Eocene of Wyoming and Colorado, and comments on the evolution of the Washakiini
James G. Honey
1990, Journal of Vertebrate Paleontology (10) 206-221
Two new species of washakiin omomyids occur in deposits of early Bridgerian age. Shoshonius bowni, sp. nov., from the Aycross Formation, Absaroka Range, Wyoming, differs from S. cooperi in having enlarged conules on the upper molars and a second metaconule, features convergent with Washakius insignis. Washakius izetti, sp. nov., from the Green River Formation,...
Snapping turtle (Chelydra serpentina) density and biomass at three pond types in the Maryland coastal plain
S.W. Gotte, R.P. Reynolds, R.W. McDiarmid
1990, Book, Proceedings of the Symposium on Phylogeny of Percomorpha
No abstract available....
A review of the evidence for the effects of hunting on American black duck populations
M.J. Conroy, D.G. Krementz
1990, Transactions of the North American Wildlife and Natural Resources Conference (55) 501-517
No abstract available....
Are earthquakes chaotic?
Bruce R. Julian
1990, Nature (345) 481-482
No abstract available....
Age estimates and uplift rates for late Pleistocene marine terraces: Southern Oregon portion of the Cascadia forearc
Daniel R. Muhs, Harvey M. Kelsey, Joseph F. Whelan, Galan W. McInelly
1990, Journal of Geophysical Research D: Atmospheres (95) 6685-6698
Interest in the Cascadia subduction zone has increased because recent investigations have suggested that slip along plates at certain types of convergent margins is characteristically accompanied by large earthquakes. In addition, other investigations have suggested that convergent margins can be broadly classified by the magnitude of their uplift rates. The...
The Denali fault system and Alaska Range of Alaska: Evidence for underplated Mesozoic flysch from magnetotelluric surveys
W. D. Stanley, Victor F. Labson, Warren J. Nokleberg, Bela Csejtey Jr., M. A. Fisher
1990, GSA Bulletin (102) 160-173
Regional magnetotelluric surveys recently completed across the central and eastern Alaska Range of Alaska provide evidence for large volumes of conductive rocks beneath the core of the range. These conductive rocks may represent a formerly extensive, but now collapsed, Mesozoic flysch basin formed on the leading edge of the Talkeetna...
Proceedings of the First National U.S. Fish and Wildlife Service Geographic Information Systems Workshop, June 4-7, 1990
Frank D’Erchia
1990, Report
No abstract available....
Age determinations and growth rates of Pacific ferromanganese deposits using strontium isotopes
B.L. Ingram, J.R. Hein, G. L. Farmer
1990, Geochimica et Cosmochimica Acta (54) 1709-1721
87Sr86Sr ratios, trace element and REE compositions, and textural characteristics were determined for three hydrogenetic Fe-Mn crusts, one hydrothermal deposit, and two mixed hydrothermalhydrogenetic crusts from the Pacific. The Sr isotope data are compared to the Sr seawater curve for the Cenozoic to determine the ages and growth rates of...
Bear use of cutthroat trout spawning streams in Yellowstone National Park
Daniel P. Reinhart, D.J. Mattson
1990, Bears: Their Biology and Management (8) 343-350
Grizzly bears (Ursus arctos) and black bears (U. americanus) prey on spawning cutthroat trout (Oncorhynchus clarki, formerly known as Salmo clarki) in tributary streams of Yellowstone Lake. These tributary streams were surveyed from 1985 to 1987 to determine the presence and level of trout spawning activity and bear use. Indices...
Metamorphism in the Adirondacks: II. The role of fluids
John W. Valley, Steven R. Bohlen, E.J. Essene, Will Lamb
1990, Journal of Petrology (31) 555-596
Quantitative estimates of metamorphic fluid speciation, stable isotopic analyses, and studies of fluid inclusions all document the local complexity of fluids in the deep crustal rocks exposed in the Adirondack Mountains, NY. Estimates of the activity of H2O in the granulite facies are substantially lower than in the amphibolite...
