Publications
Filter Total Items: 855
100,000-year-long terrestrial record of millennial-scale linkage between eastern North American mid-latitude paleovegetation shifts and Greenland ice-core oxygen isotope trends
We document frequent, rapid, strong, millennial-scale paleovegetation shifts throughout the late Pleistocene, within a 100,000+ yr interval (~ 115–15 ka) of terrestrial sediments from the mid-Atlantic Region (MAR) of North America. High-resolution analyses of fossil pollen from one core locality revealed a continuously shifting sequence of thermally dependent forest assemblages, ranging...
Authors
Ronald J. Litwin, Joseph P. Smoot, Milan J. Pavich, Helaine W. Markewich, George Brook, Nancy J. Durika
On the identification of a Pliocene time slice for data–model comparison
The characteristics of the mid-Pliocene warm period (mPWP: 3.264–3.025 Ma BP) have been examined using geological proxies and climate models. While there is agreement between models and data, details of regional climate differ. Uncertainties in prescribed forcings and in proxy data limit the utility of the interval to understand the dynamics of a warmer than present climate or evaluate...
Authors
Alan M. Haywood, Aisling M. Dolan, Steven J. Pickering, Harry J. Dowsett, Erin L. McClymont, Caroline L. Prescott, Ulrich Salzmann, Daniel J. Hill, Stephen J. Hunter, Daniel J. Lunt, James O. Pope, Paul J. Valdes
The PRISM (Pliocene Palaeoclimate) reconstruction: Time for a paradigm shift
Global palaeoclimate reconstructions have been invaluable to our understanding of the causes and effects of climate change, but single-temperature representations of the oceanic mixed layer for data–model comparisons are outdated, and the time for a paradigm shift in marine palaeoclimate reconstruction is overdue. The new paradigm in marine palaeoclimate reconstruction stems the loss of...
Authors
Harry J. Dowsett, Marci M. Robinson, Danielle K. Stoll, Kevin M. Foley, Andrew C. Johnson, Mark W. Williams, Christina Riesselman
40Ar/39Ar evidence for Late Devonian deformation in the Chester shear zone, east central Maine
No abstract available.
Authors
Hind Ghanem, Michael J. Kunk, Allan Ludman, David L. Bish, Robert P. Wintsch, Joseph Biasi
The Cambrian-Ordovician rocks of Sonora, Mexico, and southern Arizona, southwestern margin of North America (Laurentia)
Cambrian and Ordovician shelf, platform, and basin rocks are present in Sonora, Mexico, and southern Arizona and were deposited on the southwestern continental margin of North America (Laurentia). Cambrian and Ordovician rocks in Sonora, Mexico, are mostly exposed in scattered outcrops in the northern half of the state. Their discontinuous nature results from extensive Quaternary and...
Authors
William R. Page, Alta Harris, John E. Repetski
Unraveling Alleghanian orogenesis in southern Connecticut: The history of the Lyme Dome
No abstract available.
Authors
Gregory J. Walsh, John N. Aleinikoff, Robert P. Wintsch
Characterizing post-drainage succession in Thermokarst Lake Basins on the Seward Peninsula, Alaska with TerraSAR-X Backscatter and Landsat-based NDVI data
Drained thermokarst lake basins accumulate significant amounts of soil organic carbon in the form of peat, which is of interest to understanding carbon cycling and climate change feedbacks associated with thermokarst in the Arctic. Remote sensing is a tool useful for understanding temporal and spatial dynamics of drained basins. In this study, we tested the application of high-resolution...
Authors
Prajna Regmi, Guido Grosse, Miriam C. Jones, Benjamin M. Jones, K.M. Walter Anthony
Summary of the diamond resource potential and production capacity assessment of Guinea
In May of 2000, a meeting was convened in Kimberley, South Africa, by representatives of the diamond industry and leaders of African governments to develop a certification process intended to assure that export shipments of rough diamonds were free of conflict concerns. Outcomes of the meeting were formally supported later in December of 2000 by the United Nations in a resolution adopted...
Authors
Peter G. Chirico, Katherine C. Malpeli
Preliminary geologic map of the Stanardsville 7.5' quadrangle, Greene and Madison Counties, Virginia
The Stanardsville 7.5-minute quadrangle is located about 30 kilometers north of Charlottesville, Virginia, in the eastern foothills of the Blue Ridge and within the Blue Ridge physiographic province. The quadrangle contains a small part of the eastern margin of Shenandoah National Park along Saddleback Mountain just north of Swift Run Gap and stretches of Swift Run and the South, Conway...
Authors
William C. Burton, Christopher M. Bailey, E. Allen Crider
A transect through the base of the Bronson Hill Terrane in western New Hampshire
This trip will present the preliminary results of ongoing bedrock mapping in the North Hartland and Claremont North 7.5-minute quadrangles in western New Hampshire. The trip will travel from the Lebanon pluton to just north of the Sugar River pluton (Fig. 1) with the aim of examining the lower structural levels of the Bronson Hill anticlinorium (BHA), and the nature of the boundary with...
Authors
Gregory J. Walsh, Peter M. Valley, Karri R. Sicard
Patterns and controlling factors of species diversity in the Arctic Ocean
Aim The Arctic Ocean is one of the last near-pristine regions on Earth, and, although human activities are expected to impact on Arctic ecosystems, we know very little about baseline patterns of Arctic Ocean biodiversity. This paper aims to describe Arctic Ocean-wide patterns of benthic biodiversity and to explore factors related to the large-scale species diversity patterns.Location ...
Authors
Moriaki Yasuhara, Gene Hunt, Gert van Dijken, Kevin R. Arrigo, Thomas M. Cronin, Jutta E. Wollenburg
Chronostratigraphic framework for the IODP Expedition 318 cores from the Wilkes Land Margin: Constraints for paleoceanographic reconstruction
The Integrated Ocean Drilling Program Expedition 318 to the Wilkes Land margin of Antarctica recovered a sedimentary succession ranging in age from lower Eocene to the Holocene. Excellent stratigraphic control is key to understanding the timing of paleoceanographic events through critical climate intervals. Drill sites recovered the lower and middle Eocene, nearly the entire Oligocene...
Authors
Lisa Tauxe, C.E. Stickley, S. Sugisaki, P.K. Bijl, S. M. Bohaty, Henk Brinkhuis, Carlota Escutia, J.A. Flores, A.J.P. Houben, Masao Iwai, F. Jiménez-Espejo, R. McKay, S. Passchier, J.P. Ross, Christina Riesselman, Ursula Rohl, Francesca Sangiorgi, K. Welsh, A. Klaus, A. Fehr, Jacob Bendle, R. S. Dunbar, J. Gonzàlez, T. Hayden, Kota Katsuki, M.P. Olney, S.F. Pekar, P.K. Shrivastava, Tina van de Flierdt, T. M. Williams, M. Yamane