Publications
Filter Total Items: 825
Environmental and geomorphological changes on the eastern North American Continental Shelf across the Paleocene-Eocene Boundary
Foraminiferal evidence from two sites in southern Maryland, eastern United States, reveals a series of rapid ecological changes on the continental shelf during the onset of the Paleocene-Eocene Thermal Maximum (PETM). Benthic and planktic foraminifer assemblages from the South Dover Bridge (SDB) and Mattawoman Creek-Billingsley Road (MCBR) cores in the central Salisbury Embayment record changing l
Authors
Marci M. Robinson, Whittney Spivey
Quaternary eolian sediments and Carolina Bays of the U.S. Atlantic Coastal Plain province
Under modern conditions, the Atlantic Coastal Plain province of the eastern United States is not very conducive to widespread eolian sediment mobilization because of a humid and mesothermal climate, relatively low mean surface wind velocities (~1–3 m/sec), and relatively dense vegetation. LiDAR data, however, have revealed the presence of widespread eolian dunes and sand sheets (now covered by ve
Authors
Christopher S. Swezey
Geology of the Mineral and Lake Anna West Quadrangles, Virginia
This map product is a cooperator series publication and, as such, does not have a specific abstract.
Geologic mapping for this map product was completed between 2014 and 2017, with most of the field work occurring between January 2016 and May 2017. Numerous foot traverses were completed along creeks and roads throughout the field area; the shore of Lake Anna was accessed by kayak to provide addit
Authors
Mark W. Carter, William C. Burton, Ryan J. McAleer, Mary DiGiacomo-Cohen, R. Tyler Sauer
Syn-collisional exhumation of hot middle crust in the Adirondack Mountains (New York, USA): Implications for extensional orogenesis in the southern Grenville province
Extensional deformation in the lower to middle continental crust is increasingly
recognized and shown to have significant impact on crustal architecture, magma
emplacement, fluid flow, and ore deposits. Application of the concept of extensional
strain to ancient orogenic systems, like the Grenville province of eastern North
America, has helped decipher the structural evolution of these regions. Th
Authors
Sean Regan, Gregory J. Walsh, Michael L. Williams, Jeffrey R. Chiarenzelli, Megan E. Toft, Ryan J. McAleer
Geology and biostratigraphy of the Upper Floridan aquifer in the greater Savannah region, Georgia and South Carolina
The Upper Floridan aquifer (UFA) of South Carolina, Georgia, Alabama, Mississippi, and Florida has been considered a regionally continuous stratigraphic sequence of Eocene to Miocene carbonate strata, with documented unconformities based on lithology and biostratigraphy. As part of an investigation of the regional subsurface geologic framework in the Atlantic Coastal Plain Province, three deep co
Authors
Jean Self-Trail, Mercer Parker, John T. Haynes, Arthur P. Schultz, Paul. F. Huddleston
Mid-latitude net precipitation decreased with Arctic warming during the Holocene
The latitudinal temperature gradient between the Equator and the poles influences atmospheric stability, the strength of the jet stream and extratropical cyclones. Recent global warming is weakening the annual surface gradient in the Northern Hemisphere by preferentially warming the high latitudes; however, the implications of these changes for mid-latitude climate remain uncertain. Here we show t
Authors
Cody Routson, Nicholas McKay, Darrell Kaufman, Hugues Goosse, Bryan Shuman, Jessica Rodysill, Toby Ault
100-kyr paced climate change in the Pliocene warm period, Southwest Pacific
The mid to late Pliocene (~4.2-2.8 Ma.) represents an experiment in climate
sensitivity to orbital pacing in which nearly all continental ice was confined to the
Southern Hemisphere. Most studies have emphasized the dominant role of obliquity in
determining changes in ice volume and temperature at this time, although most records
come from the Northern Hemisphere, instead of the hemisphere where t
Authors
Rocio Caballero-Gill, Timothy D. Herbert, Harry Dowsett
North American Commission on Stratigraphic Nomenclature Note 69 – Application for addition of subseries/subepoch to the North American Stratigraphic Code
Consistency in stratigraphic nomenclature enables communication among scientists both regionally and globally, thus requiring the North American Stratigraphic Code, as presented by the North American Commission on Stratigraphic Nomenclature, to follow international convention. The ratification of three subseries of the Holocene by the InternationalUnion of Geological Sciences (IUGS) in June 2018 w
Authors
Marie-Pierre Aubry, Richard H. Fluegeman, Lucy E. Edwards, Brian R. Pratt, Carlton E. Brett
Widespread global peatland establishment and persistence over the last 130,000 y
Glacial−interglacial variations in CO2 and methane in polar ice cores have been attributed, in part, to changes in global wetland extent, but the wetland distribution before the Last Glacial Maximum (LGM, 21 ka to 18 ka) remains virtually unknown. We present a study of global peatland extent and carbon (C) stocks through the last glacial cycle (130 ka to present) using a newly compiled database of
Authors
Claire C. Treat, Thomas Kleinen, Nils Broothaerts, April S. Dalton, Rene Dommain, Thomas A. Douglas, Judith Z. Drexler, Sarah A Finkelstein, Guido Grosse, Geoffrey Hope, Jack Hutchings, Miriam C. Jones, Peter Kuhry, Terri Lacourse, Outi Lähteenoja, Julie Loisel, Bastiaan Notebaert, Richard Payne, Dorothy M. Peteet, A. Britta K. Sannel, Jonathan M. Stelling, Jens Strauss, Graeme T. Swindles, Julie Talbot, Charles Tarnocai, Gert Verstraeten, Christopher J. Williams, Zhengyu Xia, Zicheng Yu, Minna Väliranta, Martina Hättestrand, Helena Alexanderson, Victor Brovkin
An assessment of plant species differences on cellulose oxygen isotopes from two Kenai Peninsula, Alaska peatlands: Implications for hydroclimatic reconstructions
Peat cores are valuable archives of past environmental change because they accumulate plant organic matter over millennia. While studies have primarily focused on physical, ecological, and some biogeochemical proxies, cores from peatlands have increasingly been used to interpret hydroclimatic change using stable isotope analyses of cellulose preserved in plant remains. Previous studies indicate th
Authors
Miriam Jones, Lesleigh Anderson, Katherine Keller, Bailey Nash, Virginia Littell, Matthew J. Wooller, Chelsea Jolley
Lithologies, ages, and provenance of clasts in the Ordovician Fincastle Conglomerate, Botetourt County, Virginia, USA
The Fincastle Conglomerate is an Ordovician polymictic, poorly sorted, matrix- and clast-supported cobble to boulder-rich conglomerate located just north of Fincastle, Botetourt County, VA. At least nine other cobble and boulder conglomerates are located in a similar stratigraphic position from Virginia to Georgia west of the Blue Ridge structural front. All except the Fincastle are dominated (~80
Authors
Harvey E. Belkin, John E. Repetski, Frank T. Dulong, Nelson L. Hickling
The mighty Susquehanna—extreme floods in Eastern North America during the past two millennia
The hazards posed by infrequent major floods to communities along the Susquehanna River and the ecological health of Chesapeake Bay remain largely unconstrained due to the short length of streamgage records. Here we develop a history of high‐flow events on the Susquehanna River during the late Holocene from flood deposits contained in MD99‐2209, a sediment core recovered in 26 m of water from Ches
Authors
Michael Toomey, Meagan Cantwell, Steven Colman, Thomas M. Cronin, Jeffrey P. Donnelly, Liviu Giosan, Clifford Heil, Robert L. Korty, Marci E. Marot, Debra A. Willard