Florence Bascom Geoscience Center

Publications

Filter Total Items: 616
Publication Thumbnail
Year Published: 2021

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...

Noe, Gregory B.; Bourg, Norman A; Krauss, Ken; Duberstein, Jamie A.; Hupp, Cliff R.

Publication Thumbnail
Year Published: 2021

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...

Culver, Stephen J.; Sutton, Seth R; Mallinson, David J.; Buzas, Martin A; Robinson, Marci M.; Dowsett, Harry J.

Publication Thumbnail
Year Published: 2021

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...

Hood, Raleigh; Shenk, Gary Wynee; Dixon, Rachel L; Smith, Sean M. C.; Ball, William P.; Bash, Jesse; Batiuk, R.; Boomer, Kathy; Brady, Damian C; Cerco, Carl; Claggett, Peter R.; de Mutsert, Kim; Easton, Zachary M.; Elmore, Andrew J; Friedrichs, Marjorie A. M.; Harris, Lora A.; Ihde, Thomas F.; Lacher, Iara; Li, Li; Linker, Lewis; Miller, Andrew; Moriarty, Julia; Noe, Gregory B.; Onyullo, George; Rose, Kenneth A; Skalak, Katherine; Tian, Richard; Veith, Tamie L; Wainger, Lisa A.; Weller, Donald E.; Zhang, Yinglong J.

Publication Thumbnail
Year Published: 2021

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...

Chirico, Peter G.; DeWitt, Jessica D.; Bergstresser, Sarah E.
Chirico, P.G., DeWitt, J.D., and Bergstresser, S.E., 2021, Borehole sampling of surficial sediments in Northern Virginia and Southern Maryland: U.S. Geological Survey Open-File Report 2021–1038, 27 p., https://doi.org/10.3133/ofr20211038.

Publication Thumbnail
Year Published: 2021

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...

DeWitt, Jessica D.; Sunder, Sindhuja; Boston, Kathleen M
DeWitt, J.D., Sunder, S., and Boston, K.M., 2021, Afghanistan artisanal and Small-scale mining sector, Delve Country Profile, World Bank Extractives Global Programmatic Support Multi-Donor Trust Fund, Pact, in collaboration with the U.S. Geological Survey and the U.S. Agency for International Development, Washington, D.C., 52 p.

Publication Thumbnail
Year Published: 2021

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...

Walsh, Gregory J.; Aleinikoff, John N.; Ayuso, Robert A.; Wintsch, Robert P.

Publication Thumbnail
Year Published: 2021

Permafrost thaw in northern peatlands: Rapid changes in ecosystem and landscape functions

Peatlands within the northern permafrost region cover approximately 2 million km2 and are characterized by organic soils that can be several meters thick, and a fine-scale mosaic of permafrost and non-permafrost landforms interspersed by shallow ponds and lakes. Ongoing permafrost thaw is transforming these peatlands, causing abrupt changes...

Olefeldt, David; Hefferman, Liam; Jones, Miriam C.; Sannel, A. Britta; Treat, Claire C.; Turetsky, Merritt R.

Publication Thumbnail
Year Published: 2021

Enhanced terrestrial runoff during Oceanic Anoxic Event 2 on the North Carolina Coastal Plain, USA

A global increase in the strength of the hydrologic cycle drove an increase in the flux of terrigenous sediments into the ocean during the Cenomanian–Turonian Oceanic Anoxic Event 2 (OAE2) and was an important mechanism driving nutrient enrichment and thus organic carbon burial. This global change is primarily known from isotopic records, but...

Lowery, Christopher M; Self-Trail, Jean M.; Barrie, Craig

Publication Thumbnail
Year Published: 2021

Estimating Piacenzian sea surface temperature using an alkenone-calibrated transfer function

Stationarity of environmental preferences is a primary assumption required for any paleoenvironmental reconstruction using fossil materials based upon calibration to modern organisms. Confidence in this assumption decreases the further back in time one goes, and the validity of the assumption that species temperature tolerances have not changed...

Dowsett, Harry J.; Robinson, Marci M.; Foley, Kevin M.
Dowsett, H.J., Robinson, M.M., and Foley, K.M., 2021, Estimating Piacenzian sea surface temperature using an alkenone-calibrated transfer function: U.S. Geological Survey Scientific Investigations Report 2021–5051, 17 p., https://doi.org/10.3133/sir20215051.

Publication Thumbnail
Year Published: 2021

Biogeography and ecology of Ostracoda in the U.S. northern Bering, Chukchi, and Beaufort Seas

Ostracoda (bivalved Crustacea) comprise a significant part of the benthic meiofauna in the Pacific-Arctic region, including more than 50 species, many with identifiable ecological tolerances. These species hold potential as useful indicators of past and future ecosystem changes. In this study, we examined benthic ostracodes from nearly 300 surface...

Gemery, Laura; Cronin, Thomas M.; Cooper, Lee W.; Dowsett, Harry J.; Grebmeier, Jacqueline M.

Publication Thumbnail
Year Published: 2021

Capturing the transient hydrological response in sandy soils during a rare cloudburst associated with shallow slope failures; A case study in the Atlantic Highlands, New Jersey, USA

A cloudburst on 7 August 2018 in the coastal bluffs of the Atlantic Highlands, New Jersey, induced flooding, erosion and multiple shallow slope failures that adversely affected the surrounding hillside residential area. Historically, short-duration deluges are rare in the New York Bay region, with only eight cloudbursts of greater magnitude...

Ashland, Francis; Reilly, Pamela A.; Fiore, Alex R.

Publication Thumbnail
Year Published: 2021

Quantifying diagenesis, contributing factors, and resulting isotopic bias in benthic foraminifera using the Foraminiferal Preservation Index: Implications for geochemical proxy records

Geochemical records generated from the calcite tests of benthic foraminifera, especially those of the genera Cibicidoides and Uvigerina, provide the basis for proxy reconstructions of past climate. However, the extent to which benthic foraminifera are affected by postdepositional alteration is poorly constrained. Furthermore, how...

Poirier, Robert; Gaetano, Madison Q.; Acevedo, Kimberly; Morgan F. Schaller, Morgan F.; Raymo, Maureen E.; Kozdon, Reinhard