Publications
Filter Total Items: 899
Stitching the western Piedmont of Virginia: Early Paleozoic tectonic history of the Ellisville Pluton and the Potomac and Chopawamsic Terranes Stitching the western Piedmont of Virginia: Early Paleozoic tectonic history of the Ellisville Pluton and the Potomac and Chopawamsic Terranes
The theme of the 2014 Virginia Geological Field Conference is the tectonic development, economic geology, and seismicity of the western Piedmont of Louisa County, Virginia. It is timely for the conference to turn its attention here, for during the past decade these aspects of western Piedmont geology have garnered the renewed attention of researchers. In terms of regional tectonics, it...
Authors
K. S. Hughes, J. P. Hibbard, R.T. Sauer, William C. Burton
Macroevolutionary consequences of profound climate change on niche evolution in marine molluscs over the past three million years Macroevolutionary consequences of profound climate change on niche evolution in marine molluscs over the past three million years
In order to predict the fate of biodiversity in a rapidly changing world, we must first understand how species adapt to new environmental conditions. The long-term evolutionary dynamics of species' physiological tolerances to differing climatic regimes remain obscure. Here, we unite palaeontological and neontological data to analyse whether species' environmental tolerances remain stable...
Authors
E.E. Saupe, J.R. Hendricks, R.W. Portell, Harry J. Dowsett, A. M. Haywood, S.J. Hunter, B.S. Lieberman
The role of conflict minerals, artisanal mining, and informal trading networks in African intrastate and regional conflicts The role of conflict minerals, artisanal mining, and informal trading networks in African intrastate and regional conflicts
The relationship between natural resources and armed conflict gained public and political attention in the 1990s, when it became evident that the mining and trading of diamonds were connected with brutal rebellions in several African nations. Easily extracted resources such as alluvial diamonds and gold have been and continue to be exploited by rebel groups to fund their activities...
Authors
Peter G. Chirico, Katherine C. Malpeli
Integrated conceptual ecological model and habitat indices for the southwest Florida coastal wetlands Integrated conceptual ecological model and habitat indices for the southwest Florida coastal wetlands
The coastal wetlands of southwest Florida that extend from Charlotte Harbor south to Cape Sable, contain more than 60,000 ha of mangroves and 22,177 ha of salt marsh. These coastal wetlands form a transition zone between the freshwater and marine environments of the South Florida Coastal Marine Ecosystem (SFCME). The coastal wetlands provide diverse ecosystem services that are valued by...
Authors
G. Lynn Wingard, J. L. Lorenz
Quaternary ostracode and foraminiferal biostratigraphy and paleoceanography in the western Arctic Ocean Quaternary ostracode and foraminiferal biostratigraphy and paleoceanography in the western Arctic Ocean
The stratigraphic distributions of ostracodes and selected calcareous benthic and planktic foraminiferal species were studied in sediment cores from ~ 700 to 2700 m water depth on the Northwind, Mendeleev, and Lomonosov Ridges in the western Arctic Ocean. Microfaunal records in most cores cover mid- to late Quaternary sediments deposited in the last ~ 600 ka, with one record covering the...
Authors
Thomas M. Cronin, Lauren H. DeNinno, L.V. Polyak, Emma K. Caverly, Richard Z. Poore, Alec R. Brenner, J. Rodriguez-Lazaro, R.E. Marzen
Karst in the United States: A digital map compilation and database Karst in the United States: A digital map compilation and database
This report describes new digital maps delineating areas of the United States, including Puerto Rico and the U.S. Virgin Islands, having karst or the potential for development of karst and pseudokarst. These maps show areas underlain by soluble rocks and also by volcanic rocks, sedimentary deposits, and permafrost that have potential for karst or pseudokarst development. All 50 States...
Authors
David J. Weary, Daniel H. Doctor
Late Holocene sea level variability and Atlantic Meridional Overturning Circulation Late Holocene sea level variability and Atlantic Meridional Overturning Circulation
Pre-twentieth century sea level (SL) variability remains poorly understood due to limits of tide gauge records, low temporal resolution of tidal marsh records, and regional anomalies caused by dynamic ocean processes, notably multidecadal changes in Atlantic Meridional Overturning Circulation (AMOC). We examined SL and AMOC variability along the eastern United States over the last 2000...
Authors
Thomas M. Cronin, Jesse R. Farmer, R. E. Marzen, E. Thomas, J.C. Varekamp
Changing amounts and sources of moisture in the U.S. southwest since the Last Glacial Maximum in response to global climate change Changing amounts and sources of moisture in the U.S. southwest since the Last Glacial Maximum in response to global climate change
The U.S. southwest has a limited water supply and is predicted to become drier in the 21st century. An improved understanding of factors controlling moisture sources and availability is aided by reconstruction of past responses to global climate change. New stable isotope and growth-rate records for a central Texas speleothem indicate a strong influence of Gulf of Mexico (GoM) moisture...
Authors
Weimin Feng, Benjamin F. Hardt, Jay L. Banner, Kevin J. Meyer, Eric W. James, MaryLynn Musgrove, R. Lawrence Edwards, Hai Cheng, Angela Min
Interagency partnership to assess and restore a degraded urban riverine wetland: Dyke Marsh Wildlife Preserve, Virginia Interagency partnership to assess and restore a degraded urban riverine wetland: Dyke Marsh Wildlife Preserve, Virginia
The narrow-leaved cattail wetland known as Dyke Marsh formally became a land holding of George Washington Memorial Parkway (GWMP, a unit of the national park system) in 1959, along with a congressional directive to honor a newly-let 30-year commercial sand and gravel dredge-mining lease at the site. Dredging continued until 1974 when Public Law 93-251 called for the National Park Service...
Authors
Brent W. Steury, Ronald J. Litwin, Erik T. Oberg, Joseph P. Smoot, Milan J. Pavich, Geoffrey Sanders, Vincent L. Santucci
A methodological toolkit for field assessments of artisanally mined alluvial diamond deposits A methodological toolkit for field assessments of artisanally mined alluvial diamond deposits
This toolkit provides a standardized checklist of critical issues relevant to artisanal mining-related field research. An integrated sociophysical geographic approach to collecting data at artisanal mine sites is outlined. The implementation and results of a multistakeholder approach to data collection, carried out in the assessment of Guinea’s artisanally mined diamond deposits, also...
Authors
Peter G. Chirico, Katherine C. Malpeli
Surficial geologic map of the Charleston region, Berkeley, Charleston, Colleton, Dorchester, and Georgetown Counties, South Carolina Surficial geologic map of the Charleston region, Berkeley, Charleston, Colleton, Dorchester, and Georgetown Counties, South Carolina
This map portrays the surface and shallow subsurface geology of the greater Charleston, S.C. region east of 80°30′ west and south of 33°15′ north. The region covers the entirety of Charleston County and portions of Berkeley, Colleton, Dorchester, and Georgetown Counties. Units locally exposed at the surface range in age from middle Eocene to Holocene, but most of the area is covered by...
Authors
Robert E. Weems, William C. Lewis, Earl M. Lemon
A database and synthesis of northern peatland soil properties and Holocene carbon and nitrogen accumulation A database and synthesis of northern peatland soil properties and Holocene carbon and nitrogen accumulation
Here, we present results from the most comprehensive compilation of Holocene peat soil properties with associated carbon and nitrogen accumulation rates for northern peatlands. Our database consists of 268 peat cores from 215 sites located north of 45°N. It encompasses regions within which peat carbon data have only recently become available, such as the West Siberia Lowlands, the Hudson...
Authors
Rebecca A. Loiselle, Zicheng Yu, David Beilman, Philip Camill, Jukka Alm, Matthew Amesbury, David Anderson, Sofia Andersson, Christopher Bochicchio, Keith Barber, Lisa Belyea, Joan Bunbury, Frank M. Chambers, Dan Charman, Francois De Vleeschouwer, Barbara Fialkiawicz-Koziel, Sarah A Finkelstein, Mariusz Galka, Michelle Garneau, Dan Hammarlund, William Hinchcliffe, James Holmquist, Paul Hughes, Miriam C. Jones, Eric S. Klein, Ulla Kokfelt, Atte Korhola, Peter Kuhry, Alexandre Lamarre, Mariusz Lamentowicz, David Large, Martin Lavoie, Glen MacDonald, Gabriel Magnan, Markku Makila, Gunnar Mallon, Paul Mathijssen, Dmitri Mauquoy, Julia McCarroll, Tim R. Moore, Jonathan M. Nichols, Benjamin O’Reilly, P.O. Oksanen, Maara S. Packalen, Dorothy M. Peteet, Pierre Richard, Stephen Robinson, T.M. Ronkainen, Mats Rundgren, A. Britta K. Sannel, Charles Tarnocai, Tim Thom, Eeva-Stiina Tuittila, Merritt Turetsky, M. Valiranta, Marjolein van der Linden, Bas van Geel, Simon van Bellen, Dale Vitt, Yan Zhao, Weijian Zhou