Publications
Filter Total Items: 899
Shallow marine ecosystem collapse and recovery during the Paleocene-Eocene Thermal Maximum Shallow marine ecosystem collapse and recovery during the Paleocene-Eocene Thermal Maximum
The Paleocene-Eocene Thermal Maximum (PETM), the most well-studied transient hyperthermal event in Earth history, is characterized by prominent and dynamic changes in global marine ecosystems. Understanding such biotic responses provides valuable insights into future scenarios in the face of anthropogenic warming. However, evidence of the PETM biotic responses is largely biased towards...
Authors
Skye Y Tian, Moriaki Yasuhara, Huai-Hsuan M Huang, Fabien L. Condamine, Marci M. Robinson
Microfossils from Calvert Cliffs give us clues to the future warmer climate Microfossils from Calvert Cliffs give us clues to the future warmer climate
No abstract available.
Authors
Seth R Sutton, Marci M. Robinson, Stephen J. Culver, David J. Mallinson, Martin A Buzas, Harry J. Dowsett
Watershed and estuarine controls both influence plant community and tree growth changes in tidal freshwater forested wetlands along two U.S. mid-Atlantic rivers Watershed and estuarine controls both influence plant community and tree growth changes in tidal freshwater forested wetlands along two U.S. mid-Atlantic rivers
The tidal freshwater zone near the estuarine head-of-tide is potentially sensitive to both sea-level rise and associated salinity increases as well as changing watershed inputs of freshwater and nutrients. We evaluated the vegetation response of tidal freshwater forested wetlands (TFFW) to changes in nontidal river versus estuarine controls along the longitudinal gradient of the...
Authors
Gregory E. Noe, Norman A Bourg, Ken Krauss, Jamie A. Duberstein, Cliff R. Hupp
The Holocene dynamics of Ryder Glacier and ice tongue in north Greenland The Holocene dynamics of Ryder Glacier and ice tongue in north Greenland
The northern sector of the Greenland Ice Sheet is considered to be particularly susceptible to ice mass loss arising from increased glacier discharge in the coming decades. However, the past extent and dynamics of outlet glaciers in this region, and hence their vulnerability to climate change, are poorly documented. In the summer of 2019, the Swedish icebreaker Oden entered the...
Authors
Matt O’Regan, Thomas M. Cronin, Brendan Reilly, Aage K. Olsen Alstrup, Laura Gemery, Anna Golub, Larry A. Mayer, Mathieu Morlighem, Matthias Moros, Ole L. Munk, Johan Nilsson, Christof Pearce, Henrieka Detlef, Christian Stranne, Flor Vermassen, Gabriel West, Martin Jakobsson
Ten years on from the quake that shook the nation’s capital Ten years on from the quake that shook the nation’s capital
No abstract available.
Authors
Thomas L. Pratt, Martin C. Chapman, Anjana K. Shah, J. Wright Horton,, Oliver S. Boyd
Mg/Ca ratios in ostracode genera Sarsicytheridea and Paracyprideis: A potential paleotemperature proxy for Arctic and subarctic continental shelf and slope waters Mg/Ca ratios in ostracode genera Sarsicytheridea and Paracyprideis: A potential paleotemperature proxy for Arctic and subarctic continental shelf and slope waters
We evaluate the potential utility of Mg/Ca ratios in the sublittoral ostracode genera Sarsicytheridea and Paracyprideis as a paleotemperature proxy for continental shelf and upper slope waters of the Arctic Ocean and adjacent seas. Using sediment core-top and surface sediment samples, the shells of three species, S. bradii, S. punctillata, and P. pseudopunctillata, were analyzed from...
Authors
Thomas M. Cronin, Gary S. Dwyer, Katherine Keller, Laura Gemery, Jesse R. Farmer
Arctic Ocean stratification set by sea level and freshwater inputs since the last ice age Arctic Ocean stratification set by sea level and freshwater inputs since the last ice age
Salinity-driven density stratification of the upper Arctic Ocean isolates sea-ice cover and cold, nutrient-poor surface waters from underlying warmer, nutrient-rich waters. Recently, stratification has strengthened in the western Arctic but has weakened in the eastern Arctic; it is unknown if these trends will continue. Here we present foraminifera-bound nitrogen isotopes from Arctic...
Authors
Jesse R. Farmer, Daniel Sigman, Julie Granger, Ona M. Underwood, Francois Frapiat, Thomas M. Cronin, Alfredo Martinez-Garcia, Gerald H. Haug
Miocene neritic benthic foraminiferal community dynamics, Calvert Cliffs, Maryland, USA: Species pool, patterns and processes Miocene neritic benthic foraminiferal community dynamics, Calvert Cliffs, Maryland, USA: Species pool, patterns and processes
The presence/absence and abundance of benthic foraminifera in successive discrete beds (Shattuck “zones”) of the Miocene Calvert and Choptank formations, exposed at the Calvert Cliffs, Maryland, USA, allows for investigation of community dynamics over space and time. The stratigraphic distribution of benthic foraminifera is documented and interpreted in the context of sea-level change...
Authors
Stephen J. Culver, Seth R Sutton, David J. Mallinson, Martin A Buzas, Marci M. Robinson, Harry J. Dowsett
The Chesapeake Bay program modeling system: Overview and recommendations for future development The Chesapeake Bay program modeling system: Overview and recommendations for future development
The Chesapeake Bay is the largest, most productive, and most biologically diverse estuary in the continental United States providing crucial habitat and natural resources for culturally and economically important species. Pressures from human population growth and associated development and agricultural intensification have led to excessive nutrient and sediment inputs entering the Bay...
Authors
Raleigh Hood, Gary W. Shenk, Rachel L Dixon, Sean M. C. Smith, William P. Ball, Jesse Bash, R. Batiuk, Kathy Boomer, Damian C Brady, Carl Cerco, Peter Claggett, Kim de Mutsert, Zachary M. Easton, Andrew J Elmore, Marjorie A. M. Friedrichs, Lora A. Harris, Thomas F. Ihde, Iara Lacher, Li Li, Lewis C. Linker, Andrew Miller, Julia Moriarty, Gregory E. Noe, George Onyullo, Kenneth A Rose, Katherine Skalak, Richard Tian, Tamie L Veith, Lisa A. Wainger, Donald E. Weller, Yinglong J. Zhang
Borehole sampling of surficial sediments in Northern Virginia and Southern Maryland Borehole sampling of surficial sediments in Northern Virginia and Southern Maryland
From 2014 to 2017, the U.S. Geological Survey’s Florence Bascom Geoscience Center (FBGC) entered into an inter-agency agreement with the Federal Highway Administration’s Turner-Fairbank Highway Research Center (TFHRC) to assist in field site selection and auger drilling fieldwork. The TFHRC was developing a device to measure the erosional properties of clay-rich sediments to be used for...
Authors
Peter G. Chirico, Jessica D. DeWitt, Sarah E. Bergstresser
Afghanistan artisanal and small-scale mining sector Afghanistan artisanal and small-scale mining sector
For millennia, extractive activity in Afghanistan (officially the Islamic Republic of Afghanistan, or IRA) has been entirely artisanal or small-scale in scope. Various international governments, organizations, and companies have supported the growth of the sector, and the Government of the Islamic Republic of Afghanistan (GoIRA) views its mineral wealth as vital to the country’s...
Authors
Jessica D. DeWitt, Sindhuja Sunder, Kathleen M Boston
Age and tectonic setting of the Quinebaug-Marlboro belt and implications for the history of Ganderian crustal fragments in southeastern New England, USA Age and tectonic setting of the Quinebaug-Marlboro belt and implications for the history of Ganderian crustal fragments in southeastern New England, USA
Crustal fragments underlain by high-grade rocks represent a challenge to plate reconstructions, and integrated mapping, geochronology, and geochemistry enable the unravelling of the temporal and spatial history of exotic crustal blocks. The Quinebaug-Marlboro belt (QMB) is an enigmatic fragment on the trailing edge of the peri-Gondwanan Ganderian margin of southeastern New England...
Authors
Gregory J. Walsh, John N. Aleinikoff, Robert A. Ayuso, Robert P. Wintsch