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184900 results.

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Page 4354, results 108826 - 108850

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Publication Extents

Not all publications have extents, not all extents are completely accurate
Green coloration of recently laid black-crowned night-heron eggs
T. W. Custer
1991, Colonial Waterbirds (14) 184-185
Color of Black-crowned Night-Heron (Nycticorax nycticorax ) eggs of known laying order was quantified in a Wisconsin colony. Eggs were of greener intensity on the day of laying and one day thereafter than earlier laid eggs within a clutch. Egg color can be used to identify clutches within...
Reproductive biology and fish hosts of the Tennessee clubshell Pleurobema oviforme (Mollusca: Unionidae) in Virginia
L. R. Weaver, Garland B. Pardue, Richard J. Neves
1991, American Midland Naturalist (126) 82-89
The reproductive cycle and fish hosts of the freshwater mussel Pleurobema oviforme were determined during a 14-mo study (1979-1980) in Big Moccasin Creek, southwestern Virginia. Histological sectioning of mussel gonads collected throughout the year showed that gametogenesis for both sexes began in...
Brain acetycholinesterase activity in botulism-intoxicated mallards
Tonie E. Rocke, M.D. Samuel
1991, Journal of Wildlife Diseases (27) 317-319
Brain acetylcholinesterase (AChE) activity in captive-reared mallards (Anas platyrhynchos) that died of botulism was compared with euthanized controls. AChE levels for both groups were within the range reported for normal mallards, and there was no significant difference in mean AChE activity between birds that ingested botulism toxin and died and...
Isotopic evidence for early Proterozoic age of the Idono Complex, west-central Alaska
Marti L. Miller, J.Y. Bradshaw, D.L. Kimbrough, T. W. Stern, T. K. Bundtzen
1991, Journal of Geology (99) 209-223
The Idono Complex of west-central Alaska is a fault-bounded,  fragment of Early Proterozoic continental crust surrounded by overlap assemblages and younger terranes accreted in Mesozoic time. It is composed of granitic to dioritic orthogneiss, amphibolite, and metasedimentary rocks. Trace...
Estimation of suspended-sediment rating curves and mean suspended-sediment loads
Charles G. Crawford
1991, Journal of Hydrology (129) 331-348
Suspended-sediment loads are often estimated from an empirical relation between suspended-sediment load (L) and streamflow (S). This relation is usually defined as a power function, L = aSh, and is referred to as a suspended-sediment rating curve. This function can be formulated as either a linear or non-linear model to...
Crustal resistivity structure from magnetotelluric soundings in the Colorado Plateau-Basin and Range provinces, central and western Arizona
D. P. Klein
1991, Journal of Geophysical Research (96) 12313-12331
Resistivity structure to about 25 km depth is defined from two-dimensional modeling of 29 magnetotelluric (MT) soundings (0.002–5 Hz) that traverse 280 km of the southwestern Colorado Plateau, transition zone, and Basin and Range provinces in Arizona. From the surface to 5 km depth, the MT...
Fault orientations in extensional and conjugate strike-slip environments and their implications
W. Thatcher, D.P. Hill
1991, Geology (19) 1116-1120
Seismically active conjugate strike-slip faults in California and Japan typically have mutually orthogonal right- and left-lateral fault planes. Normal- fault dips at earthquake nucleation depths are concentrated between 40° and 50°. The observed orientations and their strong clustering are surprising, because conventional faulting...
Satellite and earth science data management activities at the U.S. geological survey's EROS data center
David M. Carneggie, Gary G. Metz, William C. Draeger, Ralph J. Thompson
1991, Conference Paper, GIS/LIS 1991 ACSM-ASPRS Fall Convention
The U.S. Geological Survey's Earth Resources Observation Systems (EROS) Data Center, the national archive for Landsat data, has 20 years of experience in acquiring, archiving, processing, and distributing Landsat and earth science data. The Center is expanding its satellite and earth science data management activities to support the U.S. Global...
Late Cretaceous and early Tertiary plutonism and deformation in the Skagit Gneiss Complex, north Cascade Range, Washington and British Columbia
R. A. Haugerud, P. Van Der Heyden, R. W. Tabor, J. S. Stacey, R. E. Zartman
1991, Geological Society of America Bulletin (103) 1297-1307
The Skagit Gneiss Complex forms a more-or-less continuous terrane within the northern, more deeply eroded part of the North Cascade Range. The complex comprises abundant plutons intruded at mid-crustal depths into a variety of metamorphosed supracrustal rocks of both oceanic and volcanic-arc origin. A plethora of syntectonic pegmatite, small plutons,...
Commentary on the sphalerite geobarometer
P. Toulmin III, P. B. Barton Jr., L.B. Wiggins
1991, American Mineralogist (76) 1038-1051
The FeS content of sphalerite in assemblages with pyrite and pyrrhotite has been widely used and widely criticized as a geobarometer. The commonly accepted form of the geobarometer is based on the composition of sphalerite being independent of temperature below about 550??C at all pressures up to at least 10...
Timing of the last highstand of Lake Lahontan
L. V. Benson
1991, Journal of Paleolimnology (5) 115-126
Radiocarbon and uranium-series ages of a variety of materials from the Lahontan basin indicate that the last highstand lake occurred between 14 500 and 13 000 yr B.P. Although few in number, existing radiocarbon and uranium-series age data also indicate that lakes in the western Lahontan subbasins were small or...
Simulation of vertical compaction in models of regional ground-water flow
S. A. Leake
Anon, editor(s)
1991, Conference Paper, IAHS Publication (International Association of Hydrological Sciences)
A new computer program was developed to simulate vertical compaction in models of regional ground-water flow. The program accounts for ground-water storage changes and compaction in discontinuous interbeds or in extensive confining beds. The new program is a package for the U.S. Geological Survey modular finite-difference ground-water flow model. Several...
Development and application of a hillslope hydrologic model
C. A. Blain, P. C. D. Milly
1991, Advances in Water Resources (14) 168-174
A vertically integrated two-dimensional lateral flow model of soil moisture has been developed. Derivation of the governing equation is based on a physical interpretation of hillslope processes. The lateral subsurface-flow model permits variability of precipitation and evapotranspiration, and allows arbitrary specification of soil-moisture retention properties. Variable slope, soil thickness, and...