Paleohydrologic record of spring deposits in and around Pleistocene pluvial Lake Tecopa, southeastern California
Stephen T. Nelson, Haraldur R. Karlsson, James B. Paces, David G. Tingey, Stephen Ward, Mark T. Peters
2001, GSA Bulletin (113) 659-670
Tufa (spring) deposits in the Tecopa basin, California, reflect the response of arid groundwater regimes to wet climate episodes. Two types of tufa are represented, informally defined as (1) an easily disaggregated, fine-grained mixture of calcite and quartz (friable tufa) in the southwest Tecopa Valley, and (2) hard, vuggy micrite,...
Displacement rates on the Toroweap and Hurricane faults: Implications for Quaternary downcutting in the Grand Canyon, Arizona
Cassandra R. Fenton, Robert H. Webb, Philip A. Pearthree, Thure E. Cerling, Robert J. Poreda
2001, Geology (29) 1035-1038
The Toroweap and Hurricane faults, considered to be the most active in Arizona, cross the Uinkaret volcanic field in the western Grand Canyon. These normal faults are downthrown to the west, and the Colorado River crosses these faults as it flows west in the Grand Canyon. Cosmogenic 3He (3Hec) dates...
Progress made in understanding Mount Rainier's hazards
T. W. Sisson, J.W. Vallance, P. T. Pringle
2001, Eos, Transactions, American Geophysical Union (82) 113-120
At 4392 m high, glacier-clad Mount Rainier dominates the skyline of the southern Puget Sound region and is the centerpiece of Mount Rainier National Park. About 2.5 million people of the greater Seattle-Tacoma metropolitan area can see Mount Rainier on clear days, and 150,000 live in areas swept by lahars...
Water quality assessment of the Eastern Iowa Basins: Basic water chemistry of rivers and streams, 1996-98
Kimberlee K. Barnes
2001, Conference Paper, Proceedings of the Agriculture and the Environment: State and Federal Water Initiatives Conference
The U.S. Geological Survey began data-collection activities in the Eastern Iowa Basins study unit of the National Water-Quality Assessment Program in September 1995 with the purpose of determining the status and trends in water quality of water from the Wapsipinicon, Cedar, Iowa, and Skunk River basins. From March 1996 through...
Geographic variation of PCB congeners in polar bears (Ursus maritimus) from Svalbard east to the Chukchi Sea
M. Andersen, E. Lie, A.E. Derocher, S.E. Belikov, A. Bernhoft, Andrei N. Boltunov, G.W. Garner, J.U. Skaare, Øystein Wiig
2001, Polar Biology (24) 231-238
We present data on geographic variation in polychlorinated biphenyl (PCB) congeners in adult female polar bears (Ursus maritimus) from Svalbard eastward to the Chukchi Sea. Blood samples from 90 free-living polar bears were collected in 1987–1995. Six PCB congeners, penta to octa chlorinated (PCB-99, -118, -153, -156, -180,...
Reconnaissance geology north of the Hoholitna River, Taylor Mountains D-1 1:63,360-scale quadrangle, southwestern Alaska: A section in Geological studies in Alaska by the U.S. Geological Survey, 1999
Robert B. Blodgett, Frederic H. Wilson
2001, Professional Paper 1633
The lower Paleozoic (Silurian and Ordovician) carbonate stratal succession is divided into six unnamed stratigraphic units in the northern part of the Taylor Mountains D-1 1:63,360-scale quadrangle of southwestern Alaska. Several of these units have previously been recognized in the McGrath and Medfra quadrangles to the northeast in strata of...
Holocene vegetation history from fossil rodent middens near Arequipa, Peru
C.A. Holmgren, J.L. Betancourt, K.A. Rylander, J. Roque, O. Tovar, H. Zeballos, E. Linares, Jay Quade
2001, Quaternary Research (56) 242-251
Rodent (Abrocoma, Lagidium, Phyllotis) middens collected from 2350 to 2750 m elevation near Arequipa, Peru (16??S), provide an ???9600-yr vegetation history of the northern Atacama Desert, based on identification of >50 species of plant macrofossils. These midden floras show considerable stability throughout the Holocene, with slightly more mesophytic plant assemblages...
Associations of grassland birds with landscape factors in southern Wisconsin
Christine Ribic, D. W. Sample
2001, American Midland Naturalist (146) 105-121
We investigated the association of grassland birds with field- and landscape-level habitat variables in south-central Wisconsin during 1985–1987. Landscape-level variables were measured and digitized at 200, 400 and 800 m from the perimeter of 38 200 m × 100 m strip transects. A mixture of field and landscape variables was...
The Gibbs free energy of nukundamite (Cu3.38Fe0.62S4): A correction and implications for phase equilibria
Robert R. Seal, II, E. E. Inan, Bruce S. Hemingway
2001, Canadian Mineralogist (39) 1635-1640
The Gibbs free energy of formation of nukundamite (Cu3.38Fe0.62S4) was calculated from published experimental studies of the reaction 3.25 Cu3.38Fe0.62S4 + S2 = 11 CuS + 2 FeS2 in order to correct an erroneous expression in the published record. The correct expression describing the Gibbs free energy of formation (kJ·mol−1) of nukundamite relative...
Seismic mapping of shallow fault zones in the San Gabriel Mountains from the Los Angeles Region Seismic Experiment, southern California
G. S. Fuis, T. Ryberg, W. J. Lutter, P.L. Ehlig
2001, Journal of Geophysical Research B: Solid Earth (106) 6549-6568
During the Los Angeles Region Seismic Experiment (LARSE), a reflection/refraction survey was conducted along a profile (line 1) extending from Seal Beach, California, northeastward to the Mojave Desert and crossing the Los Angeles and San Gabriel Valley basins and San Gabriel Mountains. In most shot gathers from the southern and...
Distribution of oxygen-18 and deuteriun in river waters across the United States
Carol Kendall, Tyler B. Coplen
2001, Hydrological Processes (15) 1363-1393
Reconstruction of continental palaeoclimate and palaeohydrology is currently hampered by limited information about isotopic patterns in the modern hydrologic cycle. To remedy this situation and to provide baseline data for other isotope hydrology studies, more than 4800, depth- and width-integrated, stream samples from 391 selected sites within the USGS...
Observation of the geology and geomorphology of the 1999 Marsokhod test site
R. A. De Hon, N.G. Barlow, M. K. Reagan, E. Arthur Bettis III, C.T. Foster Jr., V. C. Gulick, L.S. Crumpler, J.C. Aubele, M. G. Chapman, K. L. Tanaka
2001, Journal of Geophysical Research E: Planets (106) 7665-7682
The Marsokhod rover returned data from six stations that were used to decipher the geomorphology and geology of a region not previously visited by members of the geomorphology field team. Satellite images and simulated descent images provided information about the regional setting. The landing zone was on an alluvial apron...
Apatite fission-track evidence of widespread Eocene heating and exhumation in the Yukon-Tanana Upland, interior Alaska
Cynthia Dusel-Bacon, J.M. Murphy
2001, Canadian Journal of Earth Sciences (38) 1191-1204
We present an apatite fission-track (AFT) study of five plutonic rocks and seven metamorphic rocks across 310 km of the YukonTanana Upland in east-central Alaska. Samples yielding ~40 Ma AFT ages and mean confined track lengths > 14 µm with low standard...
Grassland birds associated with agricultural riparian practices in southwestern Wisconsin
R.B. Renfrew, C. A. Ribic
2001, Journal of Range Management (54) 546-552
Rotational grazing has been proposed as a Best Management Practice (BMP) for minimizing runoff in Wisconsin agricultural riparian areas. The influence of this land management practice on grassland birds has not been evaluated in relation to more traditional agricultural land management systems in Midwestern riparian areas. This study compared the...
Using multiple geochemical tracers to characterize the hydrogeology of the submarine spring off Crescent Beach, Florida
P.W. Swarzenski, C. D. Reich, R. M. Spechler, J. L. Kindinger, W.S. Moore
2001, Chemical Geology (179) 187-202
A spectacular submarine spring is located about 4 km east of Crescent Beach, FL, in the Atlantic Ocean. The single vent feature of Crescent Beach Spring provides a unique opportunity to examine onshore–offshore hydrogeologic processes, as well as point source submarine ground water discharge. The Floridan aquifer system in...
Olivine-liquid relations of lava erupted by Kilauea volcano from 1994 to 1998: Implications for shallow magmatic processes associated with the ongoing east-rift-zone eruption
Carl R. Thornber
2001, Canadian Mineralogist (39) 239-266
From 1994 through 1998, the eruption of Kîlauea, in Hawai’i, was dominated by steady-state effusion at Pu‘u ‘Ô‘ô that was briefly disrupted by an eruption 4 km uprift at Nāpau Crater on January 30, 1997. In this paper, I describe the systematic relations of whole-rock, glass, olivine, and olivine-inclusion compositions...
The geology of a part of Acadia and the nature of the Acadian orogeny across Central and Eastern Maine
R. D. Tucker, P. H. Osberg, H. N. Berry IV
2001, American Journal of Science (301) 205-260
The zone of Acadian collision between the Medial New England and Composite Avalon terranes is well preserved in Maine. A transect from northwest (Rome) to southeast (Camden) crosses the eastern part of Medial New England comprising the Central Maine basin, Liberty-Orrington thrust sheet, and Fredericton trough, and the western...
Geographic deaggregation of seismic hazard in the United States
S. Harmsen, A. Frankel
2001, Bulletin of the Seismological Society of America (91) 13-26
The seismic hazard calculations for the 1996 national seismic hazard maps have been geographically deaggregated to assist in the understanding of the relative contributions of sources. These deaggregations are exhibited as maps with vertical bars whose heights are proportional to the contribution that each geographical cell makes to the ground-motion...
Effects of suspended sediment on the reproductive success of the tricolor shiner, a crevice-spawning minnow
N.M. Burkhead, H.L. Jelks
2001, Transactions of the American Fisheries Society (130) 959-968
Excessive sedimentation of rivers and creeks has been linked to increasing levels of imperilment in the diverse fish fauna of the southeastern United States. In particular, benthic-spawning fishes have decreased in both numbers and range. The tricolor shiner Cyprinella trichroistia is a crevice-spawning minnow that is widespread in the eastern...
Water-quality trends for a stream draining the Southern Anthracite Field, Pennsylvania
C.A. Cravotta III, Michael D. Bilger
2001, Geochemistry: Exploration, Environment, Analysis (1) 33-50
Stream flow, chemical and biological data for the northern part of Swatara Creek, which drains a 112 km2 area in the Southern Anthracite Field of eastern Pennsylvania, indicate progressive improvement in water quality since 1959, after which most mines in the watershed had been flooded. Drainage from the flooded mines contributes substantially...
Impact of climate and parent material on chemical weathering in Loess-derived soils of the Mississippi River valley
D.R. Muhs, E. Arthur Bettis III, J. Been, J. P. McGeehin
2001, Soil Science Society of America Journal (65) 1761-1777
Peoria Loess-derived soils on uplands east of the Mississippi River valley were studied from Louisiana to Iowa, along a south-to-north gradient of decreasing precipitation and temperature. Major element analyses of deep loess in Mississippi and Illinois show that the composition of the parent material is similar in the northern and...
Triggered earthquakes and the 1811-1812 New Madrid, central United States, earthquake sequence
S. E. Hough
2001, Bulletin of the Seismological Society of America (91) 1574-1581
The 1811-1812 New Madrid, central United States, earthquake sequence included at least three events with magnitudes estimated at well above M 7.0. I discuss evidence that the sequence also produced at least three substantial triggered events well outside the New Madrid Seismic Zone, most likely in the vicinity of Cincinnati,...
Thermal maturity patterns in New York State using CAI and %Ro
D. J. Weary, R. T. Ryder, R.E. Nyahay
2001, Northeastern Geology and Environmental Sciences (23) 356-376
New conodont alteration index (CAI) and vitrinite reflectance (%Ro) data collected from drill holes in the Appalachian basin of New York State allow refinement of thermal maturity maps for Ordovician and Devonian rocks. CAI isotherms on the new maps show a pattern that approximates that published by Harris et al....
Water source to four U.S. wetlands: Implications for wetland management
T. C. Winter, D.O. Rosenberry, D.C. Buso, D.A. Merk
2001, Wetlands (21) 462-473
Results of long-term field studies of wetlands in four different hydrogeologic and climatic settings in the United States indicate that each has considerably different sources of water, which affects their response to climate variability and land-use practices. A fen wetland in New Hampshire is supplied almost entirely by ground water...
A geostatistical approach to predicting sulfur content in the Pittsburgh coal bed
W.D. Watson, L.F. Ruppert, L. J. Bragg, S.J. Tewalt
2001, International Journal of Coal Geology (48) 1-22
The US Geological Survey (USGS) is completing a national assessment of coal resources in the five top coal-producing regions in the US. Point-located data provide measurements on coal thickness and sulfur content. The sample data and their geologic interpretation represent the most regionally complete and up-to-date assessment of what is...
