Growth and invasive potential of Sapium sebiferum (Euphorbiaceae) within the coastal prairie region: the effects of soil and moisture regime
T.C. Barrilleaux, J.B. Grace
2000, American Journal of Botany (87) 1099-1106
The introduced tree Sapium sebiferum (Euphorbiaceae) is considered a serious threat to the preservation of the coastal prairie region of Louisiana and Texas, although it is currently uncommon in the western part of the region. The objective of this study was to evaluate the potential effects of location, soils, and...
The mountain that moved: geologic wonders of the George Washington and Jefferson National Forests
Water Resources Division, U.S. Geological Survey, U.S. Forest Service
2000, Report
Prehistoric, giant landslides in Montgomery and Craig Counties, Va., in the Blacksburg/Wythe Ranger Districts of the Jefferson National Forest, are the largest known landslides in eastern North America and are among the largest in the world. One of the landslides is more than 3 miles long! The ancient, giant landslides...
A volcano in North Carolina? A closer look at a tall tale
Susan E. Hough
2000, Seismological Research Letters (71) 704-705
The legacy of the 1811-1812 New Madrid, Central United States, earthquakes is one of tremendous enigma. We are left with just enough contemporary information to provide a measure of constraint on the isoseismal contours and therefore magnitudes of the three principal events (Nuttli, 1973; <a class="link...
Sedimentary record of the 1872 earthquake and "Tsunami" at Owens Lake, southeast California
J. P. Smoot, R. J. Litwin, J. L. Bischoff, S. J. Lund
2000, Sedimentary Geology (135) 241-254
In 1872, a magnitude 7.5-7.7 earthquake vertically offset the Owens Valley fault by more than a meter. An eyewitness reported a large wave on the surface of Owens Lake, presumably initiated by the earthquake. Physical evidence of this event is found in cores and trenches from Owens Lake, including soft-sediment...
Bed material transport in the Virgin River, Utah
E.D. Andrews
2000, Water Resources Research (36) 585-596
Detailed information concerning the rate and particle size distribution of bed material transport by streamflows can be very difficult and expensive to obtain, especially where peak streamflows are brief and bed material is poorly sorted, including some very large boulders. Such streams, however, are common in steep, arid watersheds. Any...
Facies patterns and conodont biogeography in Arctic Alaska and the Canadian Arctic Islands: Evidence against juxtaposition of these areas during early Paleozoic time
Julie A. Dumoulin, A. G. Harris, D. C. Bradley, T. A. De Freitas
2000, Polarforschung (68) 257-266
Differences in lithofacies and biofacies suggest that lower Paleozoic rocks now exposed in Arctic Alaska and the Canadian Arctic Islands did not form as part of a single depositional system. Lithologic contrasts are noted in shallow- and deep-water strata and are especially marked in Ordovician and Silurian rocks. A widespread...
Mesoproterozoic graphite deposits, New Jersey Highlands: Geologic and stable isotopic evidence for possible algal origins
R.A. Volkert, Craig A. Johnson, Albert V. Tamashausky
2000, Canadian Journal of Earth Sciences (37) 1665-1675
Graphite deposits of Mesoproterozoic age are locally abundant in the eastern New Jersey Highlands, where they are hosted by sulphidic biotite–quartz–feldspar gneiss, metaquartzite, and anatectic pegmatite. Gneiss and metaquartzite represent a shallow marine shelf sequence of locally organic-rich sand and mud. Graphite from massive deposits within metaquartzite yielded δ13C values...
A comparison of delta change and downscaled GCM scenarios for three mountainous basins in the United States
L.E. Hay, R.L. Wilby, G.H. Leavesley
2000, Journal of the American Water Resources Association (36) 387-397
Simulated daily precipitation, temperature, and runoff time series were compared in three mountainous basins in the United States: (1) the Animas River basin in Colorado, (2) the East Fork of the Carson River basin in Nevada and California, and (3) the Cle Elum River basin in Washington State. Two methods...
Geology in the 1996 USGS seismic-hazard maps, central and eastern United States
R. L. Wheeler, A. Frankel
2000, Seismological Research Letters (71) 273-282
The current (1996) national probabilistic seismic-hazard maps utilize information about geologic structure and tectonics of the central and eastern U.S. to compensate for uncertainty that arises from the short seismicity record. Geology was incorporated into the maps mainly as seven source zones that are delineated in three distinct ways. The...
Atmospheric nitrogen in the Mississippi River Basin: Amissions, deposition and transport
G.B. Lawrence, D. A. Goolsby, W.A. Battaglin, G.J. Stensland
2000, Science of Total Environment (248) 87-100
Atmospheric deposition of nitrogen has been cited as a major factor in the nitrogen saturation of forests in the north-eastern United States and as a contributor to the eutrophication of coastal waters, including the Gulf of Mexico near the mouth of the Mississippi River. Sources of nitrogen emissions and the...
Lava bubble-wall fragments formed by submarine hydrovolcanic explosions on Lō'ihi Seamount and Kīlauea Volcano
D.A. Clague, A. S. Davis, J. L. Bischoff, J.E. Dixon, R. Geyer
2000, Bulletin of Volcanology (61) 437-449
Glassy bubble-wall fragments, morphologically similar to littoral limu o Pele, have been found in volcanic sands erupted on Lō'ihi Seamount and along the submarine east rift zone of Kīlauea Volcano. The limu o Pele fragments are undegassed with respect to H2O and S and formed by mild steam explosions. Angular...
New Lower Mississippian Trilobites from the Chouteau Group of Missouri
D. K. Brezinski
2000, Annals of Carnegie Museum (69) 135-144
Reexamination of existing trilobite collections from the Kinderhookian (Lower Mississippian) Chouteau Group of central and northeastern Missouri indicates that two different suites of trilobites are present in these two areas of the state. Moreover, the study of these collections has led to the erection of a new genus and four...
Triggered surface slips in the Coachella Valley area associated with the 1992 Joshua Tree and Landers, California, Earthquakes
M. J. Rymer
2000, Bulletin of the Seismological Society of America (90) 832-848
The Coachella Valley area was strongly shaken by the 1992 Joshua Tree (23 April) and Landers (28 June) earthquakes, and both events caused triggered slip on active faults within the area. Triggered slip associated with the Joshua Tree earthquake was on a newly recognized fault, the East Wide Canyon fault,...
Correlation of 1- to 10-Hz earthquake resonances with surface measurements of S-wave reflections and refractions in the upper 50 m
R. A. Williams, W. J. Stephenson, A.D. Frankel, E. Cranswick, M. E. Meremonte, J. K. Odum
2000, Bulletin of the Seismological Society of America (90) 1323-1331
Resonances observed in earthquake seismograms recorded in Seattle, Washington, the central United States and Sherman Oaks, California, are correlated with each site's respective near-surface seismic velocity profile and reflectivity determined from shallow seismic-reflection/refraction surveys. In all of these cases the resonance accounts for the highest amplitude shaking at the site...
Molecular genetic status of Aleutian Canada Geese from Buldir and the Semidi Islands, Alaska
Barbara J. Pierson, John M. Pearce, Sandra L. Talbot, Gerald F. Shields, Kim T. Scribner
2000, The Condor (102) 172-180
We conducted genetic analyses of Aleutian Canada Geese (Branta canadensis leucopareia) from Buldir Island in the western Aleutians and the Semidi Islands in the eastern portion of their breeding range. We compared data from seven microsatellite DNA loci and 143 base pairs of the control region of mitochondrial DNA from...
Quantitative polymerase chain reaction for transforming growth factor-β applied to a field study of fish health in Chesapeake Bay tributaries
Craig A. Harms, Christopher A. Ottinger, Vicki S. Blazer, Christine L. Densmore, Laurence H. Pieper, Suzanne Kennedy-Stoskopf
2000, Environmental Health Perspectives (108) 447-452
Fish morbidity and mortality events in Chesapeake Bay tributaries have aroused concern over the health of this important aquatic ecosystem. We applied a recently described method for quantifying mRNA of an immunosuppressive cytokine, transforming growth factor-β (TGF-β), by reverse transcription quantitative-competitive polymerase chain reaction to a field study of fish...
Pesticide transport in the San Joaquin River Basin
Neil M. Dubrovsky, Charles R. Kratzer, Sandra Y. Panshin, JoAnn M. Gronberg, Kathryn M. Kuivila
2000, Conference Paper, Agrochemical fate and movement
Pesticide occurrence and concentrations were evaluated in the San Joaquin River Basin to determine potential sources and mode of transport. Land use in the basin is mainly agricultural. Spatial variations in pesticide occurrence were evaluated in relation to pesticide application and cropping patterns in three contrasting subbasins...
Paleogene strata of the Eastern Los Angeles basin, California: Paleogeography and constraints on neogene structural evolution
T. H. McCulloh, L. A. Beyer, R.J. Enrico
2000, Geological Society of America Bulletin (112) 1155-1178
Post-Paleogene dextral slip of 8–9 km is demonstrated for the southeastern part of the Whittier fault zone in the eastern Los Angeles basin area of southern California. A linear axis of greatest thickness for the combined upper Paleocene and lower to lower-middle Eocene clastic formations intersects the fault zone and...
Katmai volcanic cluster and the great eruption of 1912
W. Hildreth, J. Fierstein
2000, Geological Society of America Bulletin (112) 1594-1620
In June 1912, the world's largest twentieth century eruption broke out through flat-lying sedimentary rocks of Jurassic age near the base of Trident volcano on the Alaska Peninsula. The 60 h ash-flow and Plinian eruptive sequence excavated and subsequently backfilled with ejecta a flaring funnel-shaped vent since called Novarupta. The...
Characterizing Manatee habitat use and seagrass grazing in Florida and Puerto Rico: Implications for conservation and management
L.W. Lefebvre, J.P. Reid, W.J. Kenworthy, J. A. Powell
2000, Pacific Conservation Biology (5) 289-298
The Indian River Lagoon on the Atlantic coast of Florida, USA, and the east coast of Puerto Rico provide contrasting environments in which the endangered West Indian Manatee Trichechus manatus experiences different thermal regimes and seagrass communities. We compare Manatee feeding behaviour in these two regions, examine the ecological effects...
First record of Daphnia lumholtzi Sars in the Great Lakes
Christopher J. Muzinic
2000, Journal of Great Lakes Research (26) 352-354
Adults of the cladoceran Daphnia lumholtzi, native to Australia, Africa, and parts of Asia, were first collected in August 1999 in Lake Erie. Individuals were collected near East Harbor State Park, Lakeside, Ohio from vertical plankton net tows. The average number of D. lumholtzi that were found (0.03/L) indicate that D. lumholtzi is beginning to...
Unusual July 10, 1996, rock fall at Happy Isles, Yosemite National Park, California
G. F. Wieczorek, J.B. Snyder, R. B. Waitt, M.M. Morrissey, R. A. Uhrhammer, E. L. Harp, R.D. Norris, M.I. Bursik, L.G. Finewood
2000, Geological Society of America Bulletin (112) 75-85
Effects of the July 10, 1996, rock fall at Happy Isles in Yosemite National Park, California, were unusual compared to most rock falls. Two main rock masses fell about 14 s apart from a 665-m-high cliff southeast of Glacier Point onto a talus slope above Happy Isles in the eastern...
Kansas coal distribution, resources, and potential for coalbed methane
L. L. Brady
2000, The Compass: Earth Science Journal of Sigma Gamma Epsilon (75) 122-133
100 ft (>30 m)] determined from 32 different coal beds. Strippable coal resources at a depth <...
Debris-flow hazards in the Blue Ridge of central Virginia
G. F. Wieczorek, B. A. Morgan, R. H. Campbell
2000, Environmental & Engineering Geoscience (6) 3-23
The June 27, 1995, storm in Madison County, Virginia produced debris flows and floods that devastated a small (130 km 2 ) area of the Blue Ridge in the eastern United States. Although similar debris-flow inducing storm events may return only approximately once every two thousand years to the same given locale,...
On the modified Mercalli intensities and magnitudes of the 1811-1812 New Madrid earthquakes
S. E. Hough, J.G. Armbruster, L. Seeber, J.F. Hough
2000, Journal of Geophysical Research B: Solid Earth (105) 23839-23864
We reexamine original felt reports from the 1811–1812 New Madrid earthquakes and determine revised isoseismal maps for the three principal mainshocks. In many cases we interpret lower values than those assigned by earlier studies. In some cases the revisions result from an interpretation of original felt reports with an appreciation...
