Steady subsidence of Medicine Lake volcano, northern California, revealed by repeated leveling surveys
Daniel Dzurisin, Michael P. Poland, Roland Burgmann
2002, Journal of Geophysical Research B: Solid Earth (107) ECV 8-1-ECV 8-16
Leveling surveys of a 193‐km circuit across Medicine Lake volcano (MLV) in 1954 and 1989 show that the summit area subsided by as much as 302 ± 30 mm (−8.6 ± 0.9 mm/yr) with respect to a datum point near Bartle, California, 40 km to the southwest. This result corrects...
Topographic stress perturbations in southern Davis Mountains, west Texas 2. Hydrogeologic implications
R. H. Morin, W. Z. Savage
2002, Journal of Geophysical Research B: Solid Earth (107) ETG 6-1-ETG 6-10
As part of a regional groundwater investigation, geophysical logs were obtained in two municipal water wells located near the west Texas city of Alpine. These boreholes are 252 and 285 m deep and penetrate extrusive rocks of Tertiary age. The deeper well was drilled in the central valley and the...
Tar Creek study, Sargent oil field, Santa Clara County, California
David L. Wagner, Bill Fedasko, J.R. Carnahan, Ross Brunetti, Leslie B. Magoon, Paul G. Lillis, T.D. Lorenson, Richard G. Stanley
2002, Report
Field work in the Tar Creek area of Sargent oil field was performed June 26 to 28, 2000. The Santa Clara County study area is located in Sections, 30, 31, and 32, Township 11 South, Range 4 East, M.D.B&M; and in Sections 25 and 36, Township 11 South, Range 3...
Population dynamics of Eleutherodactylus coqui in cordillera forest reserves of Puerto Rico
J. H. Fogarty, Francisco Vilella
2002, Journal of Herpetology (36) 193-201
Various aspects of population structure and dynamics of Eleutherodactylus coqui in two forest reserves (Maricao and Guilarte) of the central mountain range of Puerto Rico were determined between July 1997 and June 1998. Adult density ranged from 8–25 animals/100 m2 for the wet season and 3–19 animals/100 m2 for the dry season. Abundance...
Distribution and abundance of snowy plovers in eastern North America, the Caribbean, and the Bahamas
Leah Gorman, Susan M. Haig
2002, Journal of Field Ornithology (73) 38-52
Snowy Plovers (Charadrius alexandrinus) are small, partially migrant shorebirds that are broadly distributed across North America. Snowy Plover distribution west of the Rocky Mountains has been well described. However, distribution and abundance east of the Rocky Mountains has not received much attention despite current status and ESA listing concerns for...
Geographic variation in the black bear (Ursus americanus) in the eastern United States and Canada
M.L. Kennedy, P.K. Kennedy, M.A. Bogan, J.L. Waits
2002, Southwestern Naturalist (47) 257-266
The pattern of geographic variation in morphologic characters of the black bear (Ursus americanus) was assessed at 13 sites in the eastern United States and Canada. Thirty measurements from 206 males and 207 females were recorded to the nearest 0.01 mm using digital calipers and subjected to principal components analysis....
Taxonomic assessment of the black bear (Ursus americanus) in the eastern United States
M.L. Kennedy, P.K. Kennedy, M.A. Bogan, J.L. Waits
2002, Southwestern Naturalist (47) 335-347
The subspecific status of the Louisiana black bear (Ursus americanus luteolus) and Florida black bear (U. a. floridanus) were assessed using morphologic features to determine their distinctness in relation to one another and to the black bear (U. a. americanus). Forty-four dimensions were recorded from skulls of 125 male and...
West Nile Virus: A threat to North American avian species
R. G. McLean
2002, Transactions of the North American Wildlife and Natural Resources Conference (67) 62-74
The introduction and extensive expansion of WNV in the US in the last three years is having a dramatic impact on native wildlife. The disease continues to cause significant mortality in a variety of bird species throughout the eastern US, particularly in American crow and blue jay populations. As the...
Spatial variability in water-balance model performance in the conterminous United States
Lauren E. Hay, Gregory J. McCabe
2002, Journal of the American Water Resources Association (38) 847-860
A monthly water-balance (WB) model was tested in 44 river basins from diverse physiographic and climatic regions across the conterminous United States (U.S.). The WB model includes the concepts of climatic water supply and climatic water demand, seasonality in climatic water supply and demand, and soil-moisture storage. Exhaustive search techniques...
Cripple Creek and other alkaline-related gold deposits in the Southern Rocky Mountains, USA: Influence of regional tectonics
Karen D. Kelley, Steve Ludington
2002, Mineralium Deposita (37) 38-60
Alkaline-related epithermal vein, breccia, disseminated, skarn, and porphyry gold deposits form a belt in the southern Rocky Mountains along the eastern edge of the North American Cordillera. Alkaline igneous rocks and associated hydrothermal deposits formed at two times. The first was during the Laramide orogeny (about 70–40 Ma), with deposits restricted...
Place vs. time and vegetational persistence: A comparison of four tropical mires from the Illinois Basin during the height of the Pennsylvanian Ice Age
William A. DiMichele, T.L. Phillips, W. John Nelson
2002, International Journal of Coal Geology (50) 43-72
Coal balls were collected from four coal beds in the southeastern part of the Illinois Basin. Collections were made from the Springfield, Herrin, and Baker coals in western Kentucky, and from the Danville Coal in southwestern Indiana. These four coal beds are among the principal mineable coals of the Illinois...
Timing and magnitude of Broad-winged Hawk migration at Montclair Hawk Lookout, New Jersey, and Hawk Mountain Sanctuary, Pennsylvania
Mark W. Miller, E. M. Greenstone, W. Greenstone, Keith L. Bildstein
2002, The Wilson Bulletin (114) 479-484
The Broad-winged Hawk (Buteo platypterus) breeds in eastern and central Canada and the United States, and winters in Central America and northern and central South America. Birders and ornithologists count migrating Broad-winged Hawks at dozens of traditional watch sites throughout the northeastern United States. We modeled counts of migrating...
Evaluation of 2-soft-release techniques to reintroduce black bears
Rick Eastridge, Joseph D. Clark
2002, Wildlife Society Bulletin (29) 1163-1174
Black bear (Ursus americanus) were extirpated from most of their range by the early 1900s by habitat destruction and unregulated hunting. Since then, bear habitat has recovered in many areas, but isolation may prevent natural recolonization. Black bear translocations often have limited success because of high mortality rates and low...
The polar bear management agreement for the southern Beaufort Sea: An evaluation of the first ten years of a unique conservation agreement
C.D. Brower, A. Carpenter, M.L. Branigan, W. Calvert, T. Evans, Anthony S. Fischbach, J.A. Nagy, S. Schliebe, I. Stirling
2002, Arctic (55) 362-372
Polar bears (Ursus maritimus) of the southern Beaufort Sea population, distributed from approximately Icy Cape, west of Point Barrow, to Pearce Point, east of Paulatuk in Canada, are harvested by hunters from both countries. In Canada, quotas to control polar bear hunting have been in place, with periodic modifications, since...
Sea otter population structure and ecology in Alaska
James L. Bodkin, Daniel H. Monson
2002, Arctic Research of the United States (16) 31-35
Sea otters are the only fully marine otter. They share a common ancestry with the Old World land otters, but their route of dispersal to the New World is uncertain. The historic range of the species is along the northern Pacific Ocean rim, between central Baja California and the islands...
Early to Middle Proterozoic construction of the Mojave province, southwestern United States
D.S. Coleman, A. P. Barth, J. L. Wooden
2002, Gondwana Research (5) 75-78
Zircon and monazite U-Pb geochronology of rocks in the western Mojave province of the southwest US reveals that the Proterozoic arc exposed there shares an intrusive and deformational history with rocks exposed further east in the Yavapai and Mazatzal belts after approximately 1780 Ma. Consequently, it seems likely that the...
Sensitive high resolution ion microprobe (SHRIMP) detrital zircon geochronology provides new evidence for a hidden neoproterozoic foreland basin to the Grenville Orogen in the eastern Midwest, U.S.A
J.O.S. Santos, L.A. Hartmann, N.J. McNaughton, R. M. Easton, R.G. Rea, P.E. Potter
2002, Canadian Journal of Earth Sciences (39) 1505-1515
A sensitive high resolution ion microprobe (SHRIMP) was used in combination with backscattered electron (BSE) and cathodoluminescence (CL) images to determine the age of detrital zircons from sandstones in the Neoproterozoic Middle Run Formation of the eastern Midwest, United States. Eleven samples from seven drill cores of the upper part...
The relationship between the abundance of smallmouth bass and double-crested cormorants in the eastern basin of Lake Ontario
Brian F. Lantry, Thomas H. Eckert, Clifford P. Schneider, Jana R. Chrisman
2002, Journal of Great Lakes Research (28) 193-201
Available population and diet data on double-crested cormorant (Phalacrocorax auritus) and smallmouth bass (Micropterus dolomieui) numbers, demographics, and exploitation rates were synthesized to examine the relationship between cormorant and smallmouth bass abundance in the U.S. waters of the eastern basin of Lake Ontario....
Mesozoic thermal history and timing of structural events for the Yukon-Tanana Upland, east-central Alaska: 40Ar/39Ar data from metamorphic and plutonic rocks
Cynthia Dusel-Bacon, Marvin A. Lanphere, W.D. Sharp, P.W. Layer, V. L. Hansen
2002, Canadian Journal of Earth Sciences (39) 1013-1051
We present new 40Ar/39Ar ages for hornblende, muscovite, and biotite from metamorphic and plutonic rocks from the YukonTanana Upland, Alaska. Integration of our data with published 40Ar/39Ar, kinematic, and metamorphic pressure (P) and temperature (T) data confirms and refines the complex interaction of metamorphism...
Crustal structure and relocated earthquakes in the Puget Lowland, Washington, from high-resolution seismic tomography
T. M. Van Wagoner, R. S. Crosson, K. C. Creager, G. Medema, L. Preston, N. P. Symons, T.M. Brocher
2002, Journal of Geophysical Research B: Solid Earth (107) ESE 22-1-ESE 22-23
The availability of regional earthquake data from the Pacific Northwest Seismograph Network (PNSN), together with active source data from the Seismic Hazards Investigation in Puget Sound (SHIPS) seismic experiments, has allowed us to construct a new high-resolution 3-D, P wave velocity model of the crust to a depth of about...
A strategy for estimating the rates of recent United States land-cover changes
Thomas R. Loveland, Terry L. Sohl, S.V. Stehman, Alisa L. Gallant, K. L. Sayler, D.E. Napton
2002, Photogrammetric Engineering and Remote Sensing (68) 1091-1099
Information on the rates of land-use and land-cover change is important in addressing issues ranging from the health of aquatic resources to climate change. Unfortunately, there is a paucity of information on land-use and land-cover change except at very local levels. We describe a strategy for estimating land-cover change across...
Responses of dabbling ducks to wetland conditions in the Prairie Pothole Region
J. E. Austin
2002, Waterbirds (25) 465-473
The relationships between wetland water conditions and breeding numbers of Mallard (Anas platyrhynchos), Northern Pintail (A. acuta), Blue-winged Teal (A. discors), and Northern Shoveler (A. clypeata) during May of 1992-1995, were examined on twelve study areas in the eastern Prairie Pothole Region. Data were collected on...
Stream piracy in the Black Hills: A geomorphology lab exercise
Brent J. Zaprowski, Edward B. Evenson, Jack B. Epstein
2002, Journal of Geoscience Education (50) 380-388
The Black Hills of South Dakota exhibits many fine examples of stream piracy that are very suitable for teaching geomorphology lab exercises. This lab goes beyond standard topographic map interpretation by using geologic maps, well logs, gravel provenance and other types of data to teach students about stream piracy. Using...
Timing of large earthquakes since A.D. 800 on the Mission Creek strand of the San Andreas fault zone at Thousand Palms Oasis, near Palm Springs, California
T. E. Fumal, M. J. Rymer, G. G. Seitz
2002, Bulletin of the Seismological Society of America (92) 2841-2860
Paleoseismic investigations across the Mission Creek strand of the San Andreas fault at Thousand Palms Oasis indicate that four and probably five surface-rupturing earthquakes occurred during the past 1200 years. Calendar age estimates for these earthquakes are based on a chronological model that incorporates radiocarbon dates from 18 in situ burn layers...
Trends in late Maastrichtian calcareous nannofossil distribution patterns, Western North Atlantic margin
Self-Trail J.M.
2002, Micropaleontology (48) 31-52
First and last occurrences of several Maastrichtian calcareous nannofossil species are shown to be diachronous across paleodepth and paleoenvironment using the graphic correlation method. Calcareous nannofossil assemblages examined from eleven cores from a deep- to shallow-water transect along the eastern United States Atlantic margin document that the first occurrence of...
