Upper triassic continental margin strata of the central alaska range: Implications for paleogeographic reconstruction
A.B. Till, A. G. Harris, B. R. Wardlaw, M. Mullen
2007, Special Paper of the Geological Society of America (431) 191-205
Remnants of a Late Triassic continental margin and ocean basin are scattered across central and southern Alaska. Little is known about the fundamental nature of the margin because most remnants have not been studied in detail and a protracted period of terrane accretion and margin-parallel translation has disrupted original...
Constancy of the relation between floc size and density in San Francisco Bay
N. K. Ganju, D. H. Schoellhamer, M.C. Murrell, J. W. Gartner, S.A. Wright
2007, Proceedings in Marine Science (8) 75-91
The size and density of fine-sediment aggregates, or flocs, govern their transport and depositional properties. While the mass and volume concentrations of flocs can be measured directly or by optical methods, they must be determined simultaneously to gain an accurate density measurement. Results are presented from a tidal cycle study in...
Origin of narrow terranes and adjacent major terranes occurring along the Denali fault in the Eastern and Central Alaska Range, Alaska
W. J. Nokleberg, D.H. Richter
2007, Special Paper of the Geological Society of America 129-154
Several narrow terranes occur along the Denali fault in the Eastern and Central Alaska Range in Southern Alaska. These terranes are the Aurora Peak, Cottonwood Creek, Maclaren, Pingston, and Windy terranes, and a terrane of ultramafic and associated rocks. Exterior to the narrow terranes to the...
USGS assessment of undiscovered oil and gas resources in Paleogene strata of the U.S. Gulf of Mexico coastal plain and state waters
Peter D. Warwick, James L. Coleman, Paul C. Hackley, Daniel O. Hayba, Alexander W. Karlsen, Elisabeth L. Rowan, Sharon M. Swanson
Lorcan Kennan, James Pindell, Norman C. Rosen, editor(s)
2007, Conference Paper, The Paleogene of the Gulf of Mexico and Caribbean basins: Processes, events, and petroleum systems
This report presents a review of the U.S. Geological Survey (USGS) 2007 assessment of the undiscovered oil and gas resources in Paleogene strata underlying the U.S. Gulf of Mexico Coastal Plain and state waters. Geochemical, geologic, geophysical, thermal maturation, burial history, and paleontologic studies have been combined with regional cross...
The effects of acidic mine drainage from historical mines in the Animas River watershed, San Juan County, Colorado—What is being done and what can be done to improve water quality?
Stanley E. Church, Robert J. Owen, Paul Von Guerard, Philip L. Verplanck, Briant A. Kimball, Douglas B. Yager
2007, Book chapter, Understanding and responding to hazardous substances at mine sites in the western United States
Historical production of metals in the western United States has left a legacy of acidic drainage and toxic metals in many mountain watersheds that are a potential threat to human and ecosystem health. Studies of the effects of historical mining on surface water chemistry and riparian habitat in the Animas...
Climate change and disturbance interactions: Workshop on climate change and disturbance interactions in western North America, Tucson, Ariz., 12-15 February 2007
Don McKenzie, Craig D. Allen
2007, Eos, Earth and Space Science News (88) 227-227
Warming temperatures across western North America, coupled with increased drought, are expected to exacerbate disturbance regimes, particularly wildfires, insect outbreaks, and invasions of exotic species. Many ecologists and resource managers expect ecosystems to change more rapidly from disturbance effects than from the effects of a changing climate by itself. A...
Introduction
Peter D. Warwick
2007, Natural Resources Research (16) 243-244
The inevitable increase in demand and continuing depletion of accessible oil and gas resources during the 21st century will cause greater dependence on energy minerals such as coal, uranium, and unconventional sources of oil and natural gas to satisfy our increasing energy needs. The Energy Minerals Division (EMD) of the...
Colored dissolved organic matter in Tampa Bay, Florida
Z. Chen, C. Hu, R.N. Conmy, F. Muller-Karger, P. Swarzenski
2007, Marine Chemistry (104) 98-109
Absorption and fluorescence of colored dissolved organic matter (CDOM) and concentrations of dissolved organic carbon (DOC), chlorophyll and total suspended solids in Tampa Bay and its adjacent rivers were examined in June and October of 2004. Except in Old Tampa Bay (OTB), the spatial distribution of CDOM showed a conservative...
USGS assessment of undiscovered oil and gas resources for the Oligocene Frio and Anahuac formations, U.S. Gulf of Mexico coastal plain and state waters: Review of assessment units
Sharon M. Swanson, Alexander W. Karlsen, Peter D. Warwick
Lorcan Kennan, James Pindell, Norman C. Rosen, editor(s)
2007, Conference Paper, The Paleogene of the Gulf of Mexico and Caribbean basins: Processes, events, and petroleum systems
The Oligocene Frio and Anahuac formations were examined by the U.S. Geological Survey (USGS) as part of an assessment of technically recoverable undiscovered conventional and unconventional hydrocarbon resources in Paleogene and Neogene strata underlying the U.S. Gulf of Mexico Coastal Plain and state waters. Work included the identification of structural,...
Hydrothermal circulation at Mount St. Helens determined by self-potential measurements
Paul A. Bedrosian, Martyn J. Unsworth, Malcolm J. S. Johnston
2007, Journal of Volcanology and Geothermal Research (160) 137-146
The distribution of hydrothermal circulation within active volcanoes is of importance in identifying regions of hydrothermal alteration which may in turn control explosivity, slope stability and sector collapse. Self-potential measurements, indicative of fluid circulation, were made within the crater of Mount St....
Historical and modern disturbance regimes of pinyon-juniper vegetation in the western U.S
William H. Romme, Craig D. Allen, J. Bailey, W. Baker, Brandon T. Bestelmeyer, P. Brown, K. Eisenhart, D. Huffman, Lisa Floyd-Hanna, B. Jacobs, R. Miller, Esteban Muldavin, Thomas W. Swetnam, R. Tausch, P. Weisberg
2007, Report
No abstract available....
Subspecific variation in the widespread burl-forming Arctostaphylos glandulosa
Jon E. Keeley, Michael C. Vasey, V. Thomas Parker
2007, Madroño (54) 42-62
The genus Arctostaphylos consists mostly of chaparral shrubs known by the common name manzanita, and one of the widest ranging of these is A. glandulosa Eastw., distributed from Baja California to Oregon. Particularly in the southern half of its range it exhibits complex patterns of morphological variation that have long presented taxonomic challenges. Phenetic...
Ra and Rn isotopes as natural tracers of submarine groundwater discharge in Tampa Bay, Florida
P.W. Swarzenski, C. Reich, K.D. Kroeger, M. Baskaran
2007, Marine Chemistry (104) 69-84
A suite of naturally occurring radionuclides in the U/Th decay series (222Rn, 223,224,226,228Ra) were studied during wet and dry conditions in Tampa Bay, Florida, to evaluate their utility as groundwater discharge tracers, both within the bay proper and within the Alafia River/estuary — a prominent free-flowing river that empties into...
Seasonal and interannual variability in the taxonomic composition and production dynamics of phytoplankton assemblages in Crater Lake, Oregon
McIntire C. David, Gary L. Larson, Robert E. Truitt
2007, Hydrobiologia (574) 179-204
Taxonomic composition and production dynamics of phytoplankton assemblages in Crater Lake, Oregon, were examined during time periods between 1984 and 2000. The objectives of the study were (1) to investigate spatial and temporal patterns in species composition, chlorophyll concentration, and primary productivity relative to seasonal patterns of water circulation; (2)...
Integrated ground-water monitoring strategy for NRC-licensed facilities and sites: Case study applications
V. Price, T. Temples, R. Hodges, Z. Dai, D. Watkins, J. Imrich
2007, Report
This document discusses results of applying the Integrated Ground-Water Monitoring Strategy (the Strategy) to actual waste sites using existing field characterization and monitoring data. The Strategy is a systematic approach to dealing with complex sites. Application of such a systematic approach will reduce uncertainty associated with site analysis, and therefore...
Thamnophis hammondii foraging behavior
Edward L. Ervin, Robert N. Fisher
2007, Herpetological Review (38) 345-346
Thamnophis hammondii is considered one of the most aquatic of the gartersnakes and is closely associated with creeks and impoundments (Fitch 1940. Univ. California Publ. Zool. 44:1–150) with a diet consisting largely of both the larvae and transformed stages of amphibians (Spea, Bufo, Rana, Pseudacris) and small fish (Oncorhynchus, Gasterosteus,...
Recent climate trends and implications for water resources in the Catskill Mountain region, New York, USA
Douglas A. Burns, Julian Klaus, Michael R. McHale
2007, Journal of Hydrology (336) 155-170
Climate scientists have concluded that the earth’s surface air temperature warmed by 0.6 °C during the 20th century, and that warming induced by increasing concentrations of greenhouse gases is likely to continue in the 21st century, accompanied by changes in the hydrologic cycle. Climate change has important implications in the Catskill...
Sedimentary rock-hosted Au deposits of the Dian-Qian-Gui area, Guizhou, and Yunnan Provinces, and Guangxi District, China
S. G. Peters, H. Jiazhan, L. Zhiping, J. Chenggui
2007, Ore Geology Reviews (31) 170-204
Sedimentary rock-hosted Au deposits in the Dian-Qian-Gui area in southwest China are hosted in Paleozoic and early Mesozoic sedimentary rocks along the southwest margin of the Yangtze (South China) Precambrian craton. Most deposits have characteristics similar to Carlin-type Au deposits and are spatially associated, on a regional scale, with deposits...
Interleukin-6 and tumor necrosis factor-alpha values in elk neonates
S. M. Barber-Meyer, C. R. Johnson, M.P. Murtaugh, L.D. Mech, P.J. White
2007, Journal of Mammalogy (88) 421-426
Serological indicators of general condition would be helpful for monitoring or assessing ungulate wildlife. Toward that end, we report the 1st reference values for 2 cytokines, interleukin-6 (IL-6) and tumor necrosis factor-alpha (TNF-??), in neonatal elk (Cervus elaphus). We obtained blood samples from 140 calves ??? 6 days old in...
Zaphrentis and the Zaphrentidae (Devonian; anthozoa, rugosa)
W. A. Oliver Jr.
2007, Bulletins of American Paleontology (2007) 5-24
Zaphrentis is one of the most widely used names in Paleozoic coral paleontology. Species of "Zaphrentis" have been named from every Paleozoic System except the Cambrian. Variants of the word, such as zaphrentoid, are widely used with varied meanings. Nomenclatural spinoffs are numerous: Neozaphrentis and Heterophrentis are obvious examples, but...
Surface temperature patterns in complex terrain: Daily variations and long-term change in the central Sierra Nevada, California
J.D. Lundquist, D.R. Cayan
2007, Journal of Geophysical Research D: Atmospheres (112)
A realistic description of how temperatures vary with elevation is crucial for ecosystem studies and for models of basin-scale snowmelt and spring streamflow. This paper explores surface temperature variability using temperature data from an array of 37 sensors, called the Yosemite network, which traverses both slopes of the Sierra Nevada...
Development and certification of the new SRM 695 trace elements in multi-nutrient fertilizer
E.A. MacKey, M.P. Cronise, C.N. Fales, R.R. Greenberg, S.D. Leigh, S.E. Long, A.F. Marlow, K.E. Murphy, R. Oflaz, J.R. Sieber, M.S. Rearick, L.J. Wood, L.L. Yu, S. A. Wilson, Paul H. Briggs, Z. A. Brown, J. Budahn, P.F. Kane, W.L. Hall Jr.
2007, Conference Paper, Analytical and Bioanalytical Chemistry
During the past seven years, several states within the US have enacted regulations that limit the amounts of selected non-nutritive elements in fertilizers. Internationally, several countries, including Japan, China, and Australia, and the European Union also limit the amount of selected elements in fertilizers. The elements of interest include As,...
Post-den emergence behavior of polar bears (Ursus maritimus) in Northern Alaska
T. S. Smith, Steven T. Partridge, Steven C. Amstrup, S. Schliebe
2007, Arctic (60) 187-194
We observed polar bear (Ursus maritimus) maternity den sites on Alaska’s North Slope in March 2002 and 2003 in an effort to describe bears’ post-den emergence behavior. During 40 sessions spanning 459 h, we observed 8 adults and 14 dependent cubs outside dens for 37.5 h (8.2% of total observation...
Structure of the California Coast Ranges and San Andreas Fault at SAFOD from seismic waveform inversion and reflection imaging
F. Bleibinhaus, J.A. Hole, T. Ryberg, G. S. Fuis
2007, Journal of Geophysical Research B: Solid Earth (112)
[1] A seismic reflection and refraction survey across the San Andreas Fault (SAF) near Parkfield provides a detailed characterization of crustal structure across the location of the San Andreas Fault Observatory at Depth (SAFOD). Steep-dip prestack migration and frequency domain acoustic waveform tomography were applied to...
Using drill cutting separates to estimate the strength of narrow shear zones at SAFOD
C. Morrow, J. Solum, S. Tembe, D. Lockner, T.-F. Wong
2007, Geophysical Research Letters (34)
[1] A technique is presented for estimating frictional strength of narrow shear zones based on hand selection of drillhole cuttings separates. Tests were conducted on cuttings from the SAFOD scientific drillhole near Parkfield, California. Since cuttings are mixed with adjacent material as they travel up the...
