A Miocene river in northern Arizona and its implications for the Colorado River and Grand Canyon
Ivo Lucchitta, Richard F. Holm, Baerbel K. Lucchitta
2011, GSA Today (21) 4-10
The southwesterly course of the pre–late Miocene Crooked Ridge River can be traced continuously for 48 km and discontinuously for 91 km in northern Arizona. It is visible today in inverted relief. Pebbles in the river gravel came from at least as far northeast as the San Juan Mountains. The...
Emergence of viral hemorrhagic septicemia virus in the North American Great Lakes region is associated with low viral genetic diversity
T.M. Thompson, W.N. Batts, M. Faisal, P. Bowser, J.W. Casey, K. Phillips, K.A. Garver, J. Winton, Gael Kurath
2011, Diseases of Aquatic Organisms (96) 29-43
Viral hemorrhagic septicemia virus (VHSV) is a fish rhabdovirus that causes disease in a broad range of marine and freshwater hosts. The known geographic range includes the Northern Atlantic and Pacific Oceans, and recently it has invaded the Great Lakes region of North America. The goal of this work was...
Diffuse Pacific-North American plate boundary: 1000 km of dextral shear inferred from modeling geodetic data
T. Parsons, W. Thatcher
2011, Geology (39) 943-946
Geodetic measurements tell us that the eastern part of the Basin and Range Province expands in an east-west direction relative to stable North America, whereas the western part of the province moves to the northwest. We develop three-dimensional finite element representations of the western United States lithosphere in an effort...
Controls on large landslide distribution and implications for the geomorphic evolution of the southern interior Columbia River basin
E.B. Safran, S.W. Anderson, M. Mills-Novoa, P.K. House, L. Ely
2011, Geological Society of America Bulletin (123) 1851-1862
Large landslides (>0.1 km2) are important agents of geomorphic change. While most common in rugged mountain ranges, large landslides can also be widespread in relatively low-relief (several 100 m) terrain, where their distribution has been relatively little studied. A fuller understanding of the role of large landslides in landscape evolution...
The remarkable occurrence of large rainfall-induced debris flows at two different locations on July 12, 2008, Southern Sierra Nevada, CA, USA
J.V. DeGraff, D.L. Wagner, A.J. Gallegos, M. DeRose, C. Shannon, T. Ellsworth
2011, Landslides (8) 343-353
On July 12, 2008, two convective cells about 155 km apart produced a brief period of intense rainfall triggering large debris flows in the southern Sierra Nevada. The northernmost cell was centered over Oak Creek Canyon, an east-flowing drainage, and its tributaries near Independence, CA, USA. About 5:00 P.M., debris flows...
Early Mesozoic paleogeography and tectonic evolution of the western United States: Insights from detrital zircon U-Pb geochronology, Blue Mountains Province, northeastern Oregon
Todd A. LaMaskin, J.D. Vervoort, R.J. Dorsey, J.E. Wright
2011, Geological Society of America Bulletin (123) 1939-1965
This study assesses early Mesozoic provenance linkages and paleogeographic-tectonic models for the western United States based on new petrographic and detrital zircon data from Triassic and Jurassic sandstones of the "Izee" and Olds Ferry terranes of the Blue Mountains Province, northeastern Oregon. Triassic sediments were likely derived from the Baker...
8 March 2010 Elazığ-Kovancilar (Turkey) Earthquake: observations on ground motions and building damage
Sinan Akkar, A. Aldemir, A. Askan, S. Bakir, E. Canbay, I.O. Demirel, M.A. Erberik, Z. Gulerce, Polat Gulkan, Erol Kalkan, S. Prakash, M.A. Sandikkaya, V. Sevilgen, B. Ugurhan, E. Yenier
2011, Seismological Research Letters (82) 42-58
An earthquake of MW = 6.1 occurred in the Elazığ region of eastern Turkey on 8 March 2010 at 02:32:34 UTC. The United States Geological Survey (USGS) reported the epicenter of the earthquake as 38.873°N-39.981°E with a focal depth of 12 km. Forty-two people lost their lives and 137 were injured during...
Viruses and bacteria in karst and fractured rock aquifers in east Tennessee, USA
T.B. Johnson, L.D. McKay, A.C. Layton, S.W. Jones, G.C. Johnson, J.L. Cashdollar, D.R. Dahling, L.F. Villegas, G.S. Fout, D.E. Williams, G. Sayler
2011, Ground Water (49) 98-110
A survey of enteric viruses and indicator bacteria was carried out in eight community water supply sources (four wells and four springs) in East Tennessee. Seven sites derived their water from carbonate aquifers and one from fractured sandstone. Four of the sites were deemed "low-risk" based on prior monitoring of...
Nest success of grassland sparrows on reclaimed surface mines
G.E. Stauffer, Duane R. Diefenbach, M.R. Marshall, D.W. Brauning
2011, Journal of Wildlife Management (75) 548-557
Grasslands resulting from surface mine reclamation support grassland songbird populations in several midwestern and eastern states in the United States, especially where reclaimed mines are large (>1,000ha). However, most reclaimed surface mines in Pennsylvania are small (<200ha), and nest success is unknown. We evaluated nest success of grasshopper (Ammodramus savannarum),...
Reassessment of stable continental regions of Southeast Asia
R. L. Wheeler
2011, Seismological Research Letters (82) 971-983
Probabilistic seismic-hazard assessments of the central and eastern United States (CEUS) require estimates of the size of the largest possible earthquake (Mmax). In most of the CEUS, sparse historical seismicity does not provide a record of moderate and large earthquakes that is sufficient to constrain Mmax. One remedy for the...
Simulating the potential effects of climate change in two Colorado basins and at two Colorado ski areas
William Battaglin, Lauren E. Hay, Steve Markstrom
2011, Earth Interactions (15) 1-23
The mountainous areas of Colorado are used for tourism and recreation, and they provide water storage and supply for municipalities, industries, and agriculture. Recent studies suggest that water supply and tourist industries such as skiing are at risk from climate change. In this study, a distributed-parameter watershed model, the Precipitation-Runoff...
Episodic soil succession on basaltic lava fields in a cool, dry environment
K.L. Vaughan, P.A. McDaniel, W.M. Phillips
2011, Soil Science Society of America Journal (75) 1462-1470
Holocene- to late Pleistocene-aged lava flows at Craters of the Moon National Monument and Preserve provide an ideal setting to examine the early stages of soil formation under cool, dry conditions. Transects were used to characterize the amount and nature of soil cover on across basaltic lava flows ranging in...
Excess nitrogen in the U.S. environment: Trends, risks, and solutions
E.A. Davidson, M.B. David, J.N. Galloway, C.L. Goodale, R. Haeuber, J. A. Harrison, R. W. Howarth, D.B. Jaynes, R.R. Lowrance, Nolan B. Thomas, J.L. Peel, R.W. Pinder, E. Porter, C.S. Snyder, A.R. Townsend, M.H. Ward
2011, Issues in Ecology
It is not surprising that humans have profoundly altered the global nitrogen (N) cycle in an effort to feed 7 billion people, because nitrogen is an essential plant and animal nutrient. Food and energy production from agriculture, combined with industrial and energy sources, have more than doubled the amount of...
Paleogene calcareous nannofossils of Southern Maryland, South Dover Bridge Core, USA
Jean M. Self-Trail
2011, Journal of Nannoplankton Research (32) 1-28
No abstract available...
On the Hydrologic Adjustment of Climate-Model Projections: The Potential Pitfall of Potential Evapotranspiration
Paul C.D. Milly, Krista A. Dunne
2011, Earth Interactions (15) 1-14
Hydrologic models often are applied to adjust projections of hydroclimatic change that come from climate models. Such adjustment includes climate-bias correction, spatial refinement ("downscaling"), and consideration of the roles of hydrologic processes that were neglected in the climate model. Described herein is a quantitative analysis of the effects of hydrologic...
Mountain-block recharge, present and past, in the eastern Espanola Basin, New Mexico, USA
Andrew H. Manning
2011, Hydrogeology Journal (19) 379-397
Noble gas recharge temperatures (NGTs) and radiocarbon ages were determined for 43 groundwater samples collected in the eastern Española Basin, New Mexico (USA), to identify mountain-block recharge in waters <10 thousand years (ka) old and to evaluate possible changes in mountain-block recharge over the past ∼35 ka. For Holocene samples from...
Coal resources for part of the Wilcox group (Paleocene-Eocene), northeast Texas
Peter D. Warwick, Claire E. Aubourg, Steven M. Podwysocki, Adam C. Schultz
Peter D. Warwick, Alexander K. Karlsen, Matthew D. Merrill, Brett J. Valentine, editor(s)
2011, Book chapter, Geologic assessment of coal in the Gulf of Mexico coastal plain
The Wilcox Group of northeast Texas contains shallow (less than 500 ft) coal deposits that are mined for use in mine-mouth electric power generating plants. The coal deposits, which are lignite in apparent rank (Pierce et al., 2011), are separated from similar shallow coal deposits in the Sabine uplift area...
Upper Cretaceous bituminous coal deposits of the Olmos Formation, Maverick County, Texas
Robert W. Hook, Peter D. Warwick, John R. SanFilipo
Peter D. Warwick, Alexander K. Karlsen, Matthew D. Merrill, Brett J. Valentine, editor(s)
2011, Book chapter, Geologic assessment of coal in the Gulf of Mexico coastal plain
This report describes the bituminous coal deposits of the Olmos Formation (Navarro Group, Upper Cretaceous; Figures 1, 2) of Maverick County in south Texas. Although these were not evaluated quantitatively as part of the current Gulf Coastal Plain coal-resource assessment, a detailed review is presented in this chapter.Prior to the...
Paleogene coal deposits of the Wilcox group and the Indio formation of south Texas
Robert W. Hook, Peter D. Warwick, John R. SanFilipo, Douglas J. Nichols
Peter D. Warwick, Alexander K. Karlsen, Matthew D. Merrill, Brett J. Valentine, editor(s)
2011, Book chapter, Geologic assessment of coal in the Gulf of Mexico coastal plain
Coal deposits of the undivided Wilcox Group and its southern equivalent Indio Formation (Paleogene) of south Texas are among the coal resources that are not evaluated quantitatively in the current Gulf Coastal Plain coal re-source assessment. South Texas Wilcox and Indio coals have not been extensively mined, nor have they...
A review of Alabama lignite deposits
Claire E. Aubourg
Peter D. Warwick, Alexander K. Karlsen, Matthew D. Merrill, Brett J. Valentine, editor(s)
2011, Book chapter, Geologic assessment of coal in the Gulf of Mexico coastal plain
This review of Alabama lignite deposits is a part of the U.S. Geological Survey (USGS) National Coal Resource Assessment (NCRA) of the Gulf Coast region (see Ruppert et al., 2002; Dennen, 2009; and other chapters of this publication). Because lignite is not currently mined in Alabama, a detailed assessment of the...
Coal resources for the Chemard Lake (Naborton No. 2) coal zone of the lower Wilcox group (Paleocene), northwestern Louisiana
Peter D. Warwick, Steven M. Podwysocki, Adam C. Schultz
Peter D. Warwick, Alexander K. Karlsen, Matthew D. Merrill, Brett J. Valentine, editor(s)
2011, Book chapter, Geologic assessment of coal in the Gulf of Mexico coastal plain
The lower part of the Wilcox Group of northwest Louisiana contains shallow (less than 500 ft) coal deposits that are mined for use in mine-mouth electric power-generating plants. The coal deposits, which are lignite A in apparent rank (Pierce et al., 2011), occur on the eastern part of the Sabine...
Episodic growth of a Late Cretaceous and Paleogene intrusive complex of pegmatitic leucogranite, Ruby Mountains core complex, Nevada, USA
Keith A. Howard, J. L. Wooden, C. G. Barnes, W. R. Premo, A.W. Snoke, S.-Y. Lee
2011, Geosphere (7) 1220-1248
Gneissic pegmatitic leucogranite forms a dominant component (>600 km3) of the midcrustal infrastructure of the Ruby Mountains–East Humboldt Range core complex (Nevada, USA), and was assembled and modified episodically into a batholithic volume by myriad small intrusions from ca. 92 to 29 Ma. This injection complex consists of deformed sheets...
Paleocene coal deposits of the Wilcox group, central Texas
Robert W. Hook, Peter D. Warwick, John R. SanFilipo, Adam C. Schultz, Douglas J. Nichols, Sharon M. Swanson
Peter D. Warwick, Alexander K. Karlsen, Matthew D. Merrill, Brett J. Valentine, editor(s)
2011, Book chapter, Geologic assessment of coal in the Gulf of Mexico coastal plain
Coal deposits in the Wilcox Group of central Texas have been regarded as the richest coal resources in the Gulf Coastal Plain. Although minable coal beds appear to be less numerous and generally higher in sulfur content (1 percent average, as-received basis; table 1) than Wilcox coal deposits in the...
Coal resources for part of the Wilcox group (Paleocene through Eocene), central Texas
Peter D. Warwick, Claire E. Aubourg, Stephen E. Suitt, Steven M. Podwysocki, Adam C. Schultz
Peter D. Warwick, Alexander K. Karlsen, Matthew D. Merrill, Brett J. Valentine, editor(s)
2011, Book chapter, Geologic assessment of coal in the Gulf of Mexico coastal plain
The Wilcox Group of central Texas contains shallow (less than 500 ft) coal deposits that are mined for use in mine-mouth electric power generating plants. These coal deposits range in apparent rank from lignite to sub-bituminous (Pierce et al., 2011) and are similar in rank and composition to shallow coal...
Spatiotemporal evolution of dike opening and décollement slip at Kīlauea Volcano, Hawai'i
E. K. Montgomery-Brown, D. K. Sinnett, K.M. Larson, Michael P. Poland, P. Segall, Asta Mikijus
2011, Journal of Geophysical Research B: Solid Earth (116)
Rapid changes in ground tilt and GPS positions on Kīlauea Volcano, Hawai'i, are interpreted as resulting from a shallow, two-segment dike intrusion into the east rift zone that began at 1217 UTC (0217 HST) on 17 June 2007 and lasted almost 3 days. As a result of the intrusion, a...
