Florence Bascom Geoscience Center

Publications

Filter Total Items: 388
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Year Published: 2019

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...

Aubry, Marie-Pierre; Fluegeman, Richard H.; Edwards, Lucy E.; Pratt, Brian R.; Brett, Carlton E.

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Year Published: 2019

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...

Jones, Miriam; Anderson, Lesleigh; Keller, Katherine; Nash, Bailey; Littell, Virginia; Wooller, Matthew J.; Jolley, Chelsea

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Year Published: 2019

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...

Belkin, Harvey E.; Repetski, John E.; Dulong, Frank T.; Hickling, Nelson L.

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Year Published: 2019

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...

Toomey, Michael; Cantwell, Meagan; Colman, Steven; Cronin, Thomas M.; Donnelly, Jeffrey P.; Giosan, Liviu; Heil, Clifford; Korty, Robert L.; Marot, Marci E.; Willard, Debra A.

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Year Published: 2019

Paleocene–Eocene Thermal Maximum prolonged by fossil carbon oxidation

A hallmark of the rapid and massive release of carbon during the Palaeocene–Eocene Thermal Maximum is the global negative carbon isotope excursion. The delayed recovery of the carbon isotope excursion, however, indicates that CO2 inputs continued well after the initial rapid onset, although there is no consensus about the source of this...

Lyons, Shelby L.; Baczynski, Allison A.; Babila, Tali L.; Bralower, Timothy J.; Hajek, Elizabeth A.; Kump, Lee R.; Polites, Ellen G.; Self-Trail, Jean M.; Trampush, Sheila M.; Vornlocher, Jamie R.; Zachos, James C.; Freeman, Katherine H.

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Year Published: 2019

The planktonic foraminiferal response to the Paleocene-Eocene thermal maximum on the Atlantic coastal plain

Planktonic foraminiferal assemblages in two cores from Maryland and New Jersey show evidence for significant changes in surface ocean habitats on the continental shelf during the Paleocene-Eocene Thermal Maximum (PETM). At both sites, significant assemblage shifts occur immediately before the onset of the event. These changes...

Livsey, Caitlin M.; Babila, Tali; Robinson, Marci M.; Bralower, Timothy J.

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Year Published: 2019

Chesapeake Bay impact structure—Development of "brim" sedimentation in a multilayered marine target

The late Eocene Chesapeake Bay impact structure was formed in a multilayered target of seawater underlain sequentially by a sediment layer and a rock layer in a continental-shelf environment. Impact effects in the “brim” (annular trough) surrounding and adjacent to the transient crater, between the transient crater rim and the outer margin,...

Dypvik, Henning; Gohn, Greg; Edwards, Lucy; Horton, J. Wright; Powars, David; Litwin, Ronald

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Year Published: 2019

Evidence for shelf acidification during the onset of the Paleocene-Eocene Thermal Maximum

A transect of paleoshelf cores from Maryland and New Jersey contains a ~0.19 m to 1.61 m thick interval with reduced percentages of carbonate during the onset of the Paleocene-Eocene Thermal Maximum (PETM). Outer paleoshelf cores are barren of nannofossils and correspond to two minor disconformities. Middle paleoshelf cores contain a mixture of...

Bralower, Timothy J.; Kump, Lee R.; Robinson, Marci M.; Self-Trail, Jean M.; Lyons, Shelby L.; Babila, Tali; Ballaron, Edward; Freeman, Katherine H.; Hajek, Elizabeth A.; Rush, William; Zachos, James C.

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Year Published: 2019

Appalachian Basin stratigraphy, tectonics, and eustasy from the Blue Ridge to the Allegheny Front, Virginia and West Virginia

This guide is from a two-day field trip in western Virginia and eastern West Virginia held before the 2015 Geological Society of America annual meeting in Baltimore, Maryland. The field trip examines exposures of Paleozoic sedimentary strata in the Appalachian Basin starting in the Blue Ridge physiographic province, going through the Valley and...

Haynes, John T.; Pitts, Alan D.; Doctor, Daniel H.; Diecchio, Richard J.; Blake, Mitchell B.

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Year Published: 2019

The impact of late Holocene land-use change, climate variability, and sea-level rise on carbon storage in tidal freshwater wetlands on the southeastern United States Coastal Plain

This study examines Holocene impacts of changes in climate, land use, and sea-level rise (SLR) on sediment accretion, carbon accumulation rates (CAR), and vegetation along a transect of tidal freshwater forested wetlands (TFFW) to oligohaline marsh along the Waccamaw River, South Carolina (4 sites) and along the Savannah River, Georgia (4 sites)....

Jones, Miriam; Bernhardt, Christopher E.; Krauss, K.W.; Noe, Gregory B.

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Year Published: 2018

Surficial materials of Massachusetts—A 1:24,000-scale geologic map database

The surficial materials geologic map database defines the distribution of nonlithified earth materials at the land surface in the 189 7.5-minute, 1:24,000-scale quadrangles that cover the Commonwealth of Massachusetts (index map). Across the State, these materials range in thickness from a few feet to more than 500 feet (ft). In some places,...

Stone, Janet Radway; Stone, Byron D.; DiGiacomo-Cohen, Mary L.; Mabee, Stephen B.
Stone, J.R., Stone, B.D., DiGiacomo-Cohen, M.L., and Mabee, S.B., comps., 2018, Surficial materials of Massachusetts—A 1:24,000-scale geologic map database: U.S. Geological Survey Scientific Investigations Map 3402, 189 sheets, scale 1:24,000; index map, scale 1:250,000; 58-p. pamphlet; and geodatabase files, https://doi.org/10.3133/sim3402.

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Year Published: 2018

Ecological changes in the nannoplankton community across a shelf transect during the onset of the Paleocene-Eocene Thermal Maximum

Warming and other environmental changes during the Paleocene‐Eocene thermal maximum (PETM) led to profound shifts in the composition and structure of nannoplankton assemblages. Here we analyze the nature of these changes in expanded records from the Cambridge‐Dorchester and Mattawoman Creek‐Billingsley Road cores in Maryland. These cores comprise...

León y León, Isabel A.; Bralower, Timothy J.; Self-Trail, Jean M.