Cambrian–Ordovician of the central Appalachians:Correlations and event stratigraphy of carbonate platform andadjacent deep-water deposits
David K. Brezinski, John F. Taylor, John E. Repetski, James D. Loch
2015, Book chapter, Geological Society of America field guide
This trip seeks to illustrate the succession of Cambrian and Ordovician facies deposited within the Pennsylvania and Maryland portion of the Great American Carbonate Bank. From the Early Cambrian (Dyeran) through Late Ordovician (Turinan), the Laurentian paleocontinent was rimmed by an extensive carbonate platform. During this protracted period of time, a...
Aftershocks illuminate the 2011 Mineral, Virginia, earthquake causative fault zone and nearby active faults
J. Wright Horton Jr., Anjana K. Shah, Daniel E. McNamara, Stephen L. Snyder, Aina M Carter
2015, Special Paper of the Geological Society of America (509) 253-271
Deployment of temporary seismic stations after the 2011 Mineral, Virginia (USA), earthquake produced a well-recorded aftershock sequence. The majority of aftershocks are in a tabular cluster that delineates the previously unknown Quail fault zone. Quail fault zone aftershocks range from ~3 to 8 km in depth and are in a...
Elk habitat suitability map for North Carolina
Steven G. Williams, David T. Cobb, Jaime A. Collazo
2015, Journal of the Southeastern Association of Fish and Wildlife Agencies (2) 181-186
Although eastern elk (Cervus elaphus canadensis) were extirpated from the eastern United States in the 19th century, they were successfully reintroduced in the North Carolina portion of the Great Smoky Mountains National Park in the early 2000s. The North Carolina Wildlife Resources Commission (NCWRC) is evaluating the prospect of reintroducing...
Provenance and detrital zircon geochronologic evolution of lower Brookian foreland basin deposits of the western Brooks Range, Alaska, and implications for early Brookian tectonism
Thomas E. Moore, Paul B. O’Sullivan, Christopher J. Potter, Raymond A. Donelick
2015, Geosphere (11) 93-122
The Upper Jurassic and Lower Cretaceous part of the Brookian sequence of northern Alaska consists of syntectonic deposits shed from the north-directed, early Brookian orogenic belt. We employ sandstone petrography, detrital zircon U-Pb age analysis, and zircon fission-track double-dating methods to investigate these deposits in a succession of thin...
Preface
J. Wright Horton Jr., Martin C. Chapman, Russell A. Green
2015, Geological Society of America Special Papers (509) vii-vii
This book grew out of a topical session on “Central Virginia Earthquakes of 2011: Geology, Geophysics, and Significance for Seismic Hazards in Eastern North America” at the 2012 The Geological Society of America (GSA) Annual Meeting in Charlotte, North Carolina (USA). It also benefitted from related sessions...
Integrating climate change into northeast and midwest State Wildlife Action Plans
Michelle D. Staudinger, Toni L. Morelli, Alexander Bryan, editor(s)
2015, Report
The Department of Interior Northeast Climate Science Center (NE CSC) conducts research that responds to the regional natural resource management community’s needs to anticipate, monitor, and adapt to climate change. The NE CSC is supported by a consortium of partners that includes the University of Massachusetts Amherst, College of Menominee...
Field trip guidebook for the post-meeting field trip: The Central Appalachians
John F. Taylor, James D. Loch, G. Robert Ganis, John E. Repetski, Charles E. Mitchell, Gale C. Blackmer, David K. Brezinski, Daniel Goldman, Randall C. Orndorff, Bryan K. Sell
2015, Stratigraphy (12) 297-413
The lower Paleozoic rocks to be examined on this trip through the central Appalachians represent an extreme range of depositional environments. The lithofacies we will examine range from pelagic radiolarian chert and interbedded mudstone that originated on the deep floor of the Iapetus Ocean, through mud cracked supratidal dolomitic laminites...
A sinuous tumulus over an active lava tube at Kīlauea Volcano: evolution, analogs, and hazard forecasts
Tim R. Orr, Jacob E. Bleacher, Matthew R. Patrick, Kelly M. Wooten
2015, Journal of Volcanology and Geothermal Research (291) 35-48
Inflation of narrow tube-fed basaltic lava flows (tens of meters across), such as those confined by topography, can be focused predominantly along the roof of a lava tube. This can lead to the development of an unusually long tumulus, its shape matching the sinuosity of the underlying lava tube. Such...
Spatial patterns of atmospheric deposition of nitrogen and sulfur using ion-exchange resin collectors in Rocky Mountain National Park, USA
David W. Clow, Heidi Roop, Leora Nanus, Mark Fenn, Graham A. Sexstone
2015, Atmospheric Environment (101) 149-157
Lakes and streams in Class 1 wilderness areas in the western United States (U.S.) are at risk from atmospheric deposition of nitrogen (N) and sulfur (S), and protection of these resources is mandated under the Federal Clean Air Act and amendments. Assessment of critical loads, which are the maximum exposure...
Early Permian conodont fauna and stratigraphy of the Garden Valley Formation, Eureka County, Nevada
Bruce R. Wardlaw, Dora M. Gallegos, Valery V. Chernykh, Walter S. Snyder
2015, Micropaleontology (61) 369-387
The lower part of the Garden Valley Formation yields two distinct conodont faunas. One of late Asselian age dominated by Mesogondolella and Streptognathodus and one of Artinskian age dominated by Sweetognathus with Mesogondolella. The Asselian fauna contains the same species as those found in the type area of the Asselian...
Continuous monitoring of meteorological conditions and movement of a deep-seated, persistently moving rockslide along Interstate Route 79 near Pittsburgh
Francis Ashland, Helen L. Delano
2015, Pennsylvania Geology (45) 22-26
A large inventory of landslides exists for Allegheny County, Pa., and historical movement of manyof these has resulted in considerable damage to property, roads, and infrastructure. Along InterstateRoute 79, a subset of the landslide inventory includes deep-seated rockslides, two of which reactivatedduring construction of the highway in the late 1960s...
Ants of the national park of American Samoa
Paul C. Banko, Robert W. Peck
2015, Technical Report HCSU-061
American Samoa makes up the eastern end of the Samoan Archipelago. On the islands of Tutuila, Taʽū and Ofu, the National Park of American Samoa (NPSA) protects about 4,000 ha of coastal, mid-slope and ridge-top forest. While the ant fauna of the Samoan Archipelago is considered relatively well documented, much...
River corridor science: Hydrologic exchange and ecological consequences from bedforms to basins
Judson Harvey, Michael Gooseff
2015, Water Resources Research (51) 6893-6922
Previously regarded as the passive drains of watersheds, over the past 50 years, rivers have progressively been recognized as being actively connected with off-channel environments. These connections prolong physical storage and enhance reactive processing to alter water chemistry and downstream transport of materials and energy. Here we propose river corridor...
Having it both ways? Land use change in a U.S. midwestern agricultural ecoregion
Roger F. Auch, Chris R. Laingen
2015, Professional Geographer (67) 84-97
Urbanization has been directly linked to decreases in area of agricultural lands and, as such, has been considered a threat to food security. Although the area of land used to produce food has diminished, often overlooked have been changes in agricultural output. The Eastern Corn Belt Plains (ECBP) is an...
Structural superposition in fault systems bounding Santa Clara Valley, California
Russell W. Graymer, Richard G. Stanley, David A. Ponce, Robert C. Jachens, Robert W. Simpson, Carl M. Wentworth
2015, Geosphere (11) 63-75
Santa Clara Valley is bounded on the southwest and northeast by active strike-slip and reverse-oblique faults of the San Andreas fault system. On both sides of the valley, these faults are superposed on older normal and/or right-lateral normal oblique faults. The older faults comprised early components of the San Andreas...
Estimating mean long-term hydrologic budget components for watersheds and counties: An application to the commonwealth of Virginia, USA
Ward E. Sanford, David L. Nelms, Jason P. Pope, David L. Selnick
2015, Hydrology: Current Research (6) 1-22
Mean long-term hydrologic budget components, such as recharge and base flow, are often difficult to estimate because they can vary substantially in space and time. Mean long-term fluxes were calculated in this study for precipitation, surface runoff, infiltration, total evapotranspiration (ET), riparian ET, recharge, base flow (or groundwater discharge) and...
A field comparison of multiple techniques to quantify groundwater - surface-water interactions
Ricardo Gonzalez-Pinzon, Adam S Ward, Christine E Hatch, Adam N. Wlostowski, Kamini Singha, Michael N. Gooseff, Roy Haggerty, Judson Harvey, Olaf A Cirpka, James T Brock
2015, Freshwater Science (34) 139-160
Groundwater–surface-water (GW-SW) interactions in streams are difficult to quantify because of heterogeneity in hydraulic and reactive processes across a range of spatial and temporal scales. The challenge of quantifying these interactions has led to the development of several techniques, from centimeter-scale probes to whole-system tracers, including chemical, thermal, and electrical...
San Andreas tremor cascades define deep fault zone complexity
David R. Shelly
2015, Nature Geoscience (8) 145-252
Weak seismic vibrations - tectonic tremor - can be used to delineate some plate boundary faults. Tremor on the deep San Andreas Fault, located at the boundary between the Pacific and North American plates, is thought to be a passive indicator of slow fault slip. San Andreas Fault tremor migrates at...
An ignimbrite caldera from the bottom up: Exhumed floor and fill of the resurgent Bonanza caldera, Southern Rocky Mountain volcanic field, Colorado
Peter W. Lipman, Matthew J. Zimmerer, William C. McIntosh
2015, Geosphere (11) 1902-1947
Among large ignimbrites, the Bonanza Tuff and its source caldera in the Southern Rocky Mountain volcanic field display diverse depositional and structural features that provide special insights concerning eruptive processes and caldera development. In contrast to the nested loci for successive ignimbrite eruptions at many large multicyclic calderas elsewhere, Bonanza...
Flood trends: Not higher but more often
Robert M. Hirsch, Stacey A. Archfield
2015, Nature Climate Change (5) 198-199
Heavy precipitation has increased worldwide, but the effect of this on flood magnitude has been difficult to pinpoint. An alternative approach to analysing records shows that, in the central United States, floods have become more frequent but not larger....
Ordovician of Germany Valley, West Virginia
John T. Haynes, Keith E. Goggin, Randall C. Orndorff, Lisa R. Goggin
2015, Stratigraphy (12) 1-45
This trip will consist of stops at five locations (Fig. 1) that provide a detailed look at the strata in a major part of the Ordovician section in Germany Valley, Pendleton County, West Virginia. At these stops, we will highlight a varied sequence of carbonate and siliciclastic strata that accumulated during the...
Cenozoic stratigraphy and structure of the Chesapeake Bay region
David S. Powars, Lucy E. Edwards, Susan M. Kidwell, J. Stephen Schindler
2015, Book
The Salisbury embayment is a broad tectonic downwarp that is filled by generally seaward-thickening, wedge-shaped deposits of the central Atlantic Coastal Plain. Our two-day field trip will take us to the western side of this embayment from the Fall Zone in Washington, D.C., to some of the bluffs along Aquia...
Oxic to anoxic transition in bottom waters during formation of the Citronen Fjord sediment-hosted Zn-Pb deposit, North Greenland
John F. Slack, Diogo Rosa, Hendrik Falck
2015, Conference Paper, 13th Biennial Meeting of the Society for Geology Applied to Mineral Deposits
Bulk geochemical data acquired for host sedimentary rocks to the Late Ordovician Citronen Fjord sediment-hosted Zn-Pb deposit in North Greenland constrain the redox state of bottom waters prior to and during sulphide mineralization. Downhole profiles for one drill core show trends for redox proxies (MnO, Mo, Ce anomalies) that suggest...
Paleoseismologic evidence for large-magnitude (Mw 7.5-8.0) earthquakes on the Ventura blind thrust fault: Implications for multifault ruptures in the Transverse Ranges of southern California
Lee J. McAuliffe, James F. Dolan, Edward J. Rhodes, Judith Hubbard, John H. Shaw, Thomas L. Pratt
2015, Geosphere (11) 1629-1650
Detailed analysis of continuously cored boreholes and cone penetrometer tests (CPTs), high-resolution seismic-reflection data, and luminescence and 14C dates from Holocene strata folded above the tip of the Ventura blind thrust fault constrain the ages and displacements of the two (or more) most recent earthquakes. These two earthquakes, which are...
Potential nitrogen critical loads for northern Great Plains grassland vegetation
Amy J. Symstad, Anine T. Smith, Wesley E. Newton, Alan K. Knapp
2015, Natural Resource Report NPS/NGPN/NRR - 2015/989
The National Park Service is concerned that increasing atmospheric nitrogen deposition caused by fossil fuel combustion and agricultural activities could adversely affect the northern Great Plains (NGP) ecosystems in its trust. The critical load concept facilitates communication between scientists and policy makers or land managers by translating the complex effects...
