Publications
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Latitudinal limits to the predicted increase of the peatland carbon sink with warming
The carbon sink potential of peatlands depends on the balance of carbon uptake by plants and microbial decomposition. The rates of both these processes will increase with warming but it remains unclear which will dominate the global peatland response. Here we examine the global relationship between peatland carbon accumulation rates during the last millennium and planetary-scale climate space. A p
Authors
Angela Gallego-Sala, Dan Charman, Simon Brewer, Sue Page, I. Colin Prentice, Pierre Friedlingstein, Steven Morley, Matthew Amesbury, David Beilman, Svante Bjorck, Tatiana Blyakharchuk, Christopher Bochicchio, Robert K Booth, Joan Bunbury, Philip Camill, Donna Carless, Rodney A. Chimner, Michael Clifford, Elizabeth Cressey, Colin Courtney-Mustaphi, Francois De Vleeschouwer, Rixt de Jong, Barbara Fialkiawicz-Koziel, Sarah A Finkelstein, Michelle Garneau, Esther N. Githumbi, John Hribjlan, James Holmquist, Paul Hughes, Chris D. Jones, Miriam Jones, Edgar Karofeld, Eric S. Klein, Ulla Kokfelt, Atte Korhola, Terri Lacourse, Gael LeRoux, Mariusz Lamentowicz, David Large, Martin Lavoie, Julie Loisel, Helen MacKay, Glen M. MacDonald, Markku Makila, Gabriel Magnan, R. Marchant, Katarzyna Marcisz, Antonio Martinez-Cortizas, Charly Massa, Paul Mathijssen, Dmitri Mauquoy, Timothy Mighall, Fraser J.G. Mitchell, Patrick Moss, J. Nichols, P.O. Oksanen, L. Orme, Maara S. Packalen, Stephen Robinson, Thomas P. Roland, Nicole K. Sanderson, A. B. K. Sannel, Noemi Silva-Sanchez, Natasha Steinberg, Graeme T. Swindles, T. Edward Turner, Joanna Uglow, M. Valiranta, Simon van Bellen, Marjolein van der Linden, Guoping Wang, Zicheng Yu, Joana Zaragoza-Castells, Yan Zhao
Geologic map of the Timberville quadrangle, Virginia
This map of the Timberville 7.5-minute quadrangle in Rockingham and Shenandoah counties, Virginia shows the distribution of Paleozoic-age sedimentary rocks in map and cross-section. Surficial deposits including alluvium and colluvium are also shown. The characteristics of each map unit are described and a brief report discusses the stratigraphy, structure and mineral resources of the area.
Authors
Matthew J. Heller, Randall C. Orndorff, David A. Hubbard, Eugene K. Rader
Kinematic, deformational, and thermochronologic conditions along the Gossan Lead and Fries shear zones: Constraining the western-eastern Blue Ridge boundary in northwestern North Carolina
The fault boundary between the western and eastern Blue Ridge (WBR-EBR) in the southern Appalachians separates Mesoproterozoic basement rocks and their cover from Neoproterozoic to Paleozoic accreted rocks. Several northeast striking faults delineate the boundary, including the Gossan Lead shear zone in northwestern North Carolina. Varying tectonic interpretations of WBR-EBR boundary include a pre
Authors
Jamie S. F. Levine, Arthur J. Merschat, Ryan J. McAleer, G. Casale, K. R. Quillan, K. I. Fraser, T. G. BeDell
Divisions of geologic time—Major chronostratigraphic and geochronologic units
IntroductionEffective communication in the geosciences requires a consistent nomenclature for stratigraphic units and, especially, for divisions of geologic time. A geologic time scale is composed of standard stratigraphic divisions based on rock sequences and is calibrated in years.Geologists from the U.S. Geological Survey (USGS), State geological surveys, academia, and other organizations requi
Authors
Late Holocene paleoceanography in the Chukchi and Beaufort Seas, Arctic Ocean, based on benthic foraminifera and ostracodes
Calcareous microfossil assemblages in late Holocene sediments from the western Arctic continental shelf provide an important baseline for evaluating the impacts of today’s changing Arctic oceanography. This study compares 14C-dated late Holocene microfaunal assemblages of sediment cores SWERUS-L2-2-PC1, 2-MC4 and 2-KL1 (57 mwd), which record the last 4200 years in the Herald Canyon (Chukchi Sea sh
Authors
Julia Lynn Seidenstein, Thomas M. Cronin, Laura Gemery, Lloyd D Keigwin, Christof Pearce, Martin Jakobsson, Helen K Coxall, Emily A Wei, Neal W. Driscoll
Paleoclimate Records: Providing context and understanding of current Arctic change
At present, the Arctic Ocean is experiencing changes in ocean surface temperature and sea ice extent that are unprecedented in the era of satellite observations, which extend from the 1980s to the present (see sections 5c,d). To provide context for current changes, scientists turn to paleoclimate records to document and study anthropogenic influence and natural decadal and multidecadal climate var
Authors
Emily Osborne, Thomas M. Cronin, Jesse Farmer
Icebergs in the Nordic Seas throughout the Late Pliocene
The Arctic cryosphere is changing and making a significant contribution to sea level rise. The Late Pliocene had similar CO2 levels to the present and a warming comparable to model predictions for the end of this century. However, the state of the Arctic cryosphere during the Pliocene remains poorly constrained. For the first time we combine outputs from a climate model with a thermodynamic iceber
Authors
Yvonne M. Smith, Daniel Hill, Aisling M Dolan, Alan M Haywood, Harry J. Dowsett, Bjorg Risebrobakken
Bedrock geologic map of the Littleton and Lower Waterford quadrangles, Essex and Caledonia Counties, Vermont, and Grafton County, New Hampshire
The bedrock geologic map of the Littleton and Lower Waterford quadrangles covers an area of approximately 107 square miles (277 square kilometers) north and south of the Connecticut River in east-central Vermont and adjacent New Hampshire. This map was created as part of a larger effort to produce a new bedrock geologic map of Vermont through the collection of field data at a scale of 1:24,000. A
Authors
Douglas W. Rankin
Preliminary geologic framework developed for a proposed environmental monitoring study of a deep, unconventional Marcellus Shale drill site, Washington County, Pennsylvania
BackgroundIn the fall of 2011, the U.S. Geological Survey (USGS) was afforded an opportunity to participate in an environmental monitoring study of the potential impacts of a deep, unconventional Marcellus Shale hydraulic fracturing site. The drill site of the prospective case study is the “Range Resources MCC Partners L.P. Units 1-5H” location (also referred to as the “RR–MCC” drill site), locate
Authors
Robert G. Stamm
Carboniferous climate teleconnections archived in coupled bioapatite δ18OPO4 and 87Sr/86Sr records from the epicontinental Donets Basin, Ukraine
Reconstructions of paleo-seawater chemistry are largely inferred from biogenic records of epicontinental seas. Recent studies provide considerable evidence for large-scale spatial and temporal variability in the environmental dynamics of these semi-restricted seas that leads to the decoupling of epicontinental isotopic records from those of the open ocean. We present conodont apatite δ18OPO4 and 8
Authors
Isabel P. Montanez, Dillon J. Osleger, J.-H. Chen, Barbara E. Wortham, Robert G. Stamm, Tamara I. Nemyrovska, Julie M. Griffin, Vladislav I. Poletaev, Bruce R. Wardlaw
Bedrock geologic map of the Lisbon quadrangle, and parts of the Sugar Hill and East Haverhill quadrangles, Grafton County, New Hampshire
The bedrock geologic map of the Lisbon quadrangle, and parts of the Sugar Hill and East Haverhill quadrangles, Grafton County, New Hampshire, covers an area of approximately 73 square miles (189 square kilometers) in west-central New Hampshire. This map was created as part of a larger effort to produce a new bedrock geologic map of Vermont through the collection of field data at a scale of 1:24,00
Authors
Douglas W. Rankin
Bedrock geologic map of the Miles Pond and Concord quadrangles, Essex and Caledonia Counties, Vermont, and Grafton County, New Hampshire
The bedrock geologic map of the Miles Pond and Concord quadrangles covers an area of approximately 107 square miles (276 square kilometers) in east-central Vermont and adjacent New Hampshire, north of and along the Connecticut River. This map was created as part of a larger effort to produce a new bedrock geologic map of Vermont through the collection of field data at a scale of 1:24,000. The majo
Authors
Douglas W. Rankin