Florence Bascom Geoscience Center

Publications

Filter Total Items: 388
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Year Published: 2020

Geochronologic age constraints on tectonostratigraphic units of the central Virginia Piedmont, USA

New geologic mapping coupled with uranium-lead (U-Pb) zircon geochronology (sensitive high-resolution ion microprobe-reverse geometry [SHRIMP-RG] and laser ablation-inductively coupled plasma-mass spectrometry [LA-ICP-MS]) analyses of 10 samples, provides new constraints on the tectonostratigraphic framework of the central Virginia Piedmont....

Carter, Mark W.; McAleer, Ryan J.; Holm-Denoma, Christopher S.; Spears, David B.; Regan, Sean P.; Burton, William C.; Evans, Nick H.
Carter, M.W., McAleer, R.J., Holm-Denoma, C.S., Spears, D.B., Regan, S.P., Burton, W.C., and Evans, N.H., 2020, Geochronologic age constraints on tectonostratigraphic units of the central Virginia Piedmont, USA: U.S. Geological Survey Professional Paper 1861, 28 p., https://doi.org/10.3133/pp1861.

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Year Published: 2020

Carbon release through abrupt permafrost thaw

The permafrost zone is expected to be a substantial carbon source to the atmosphere, yet large-scale models currently only simulate gradual changes in seasonally thawed soil. Abrupt thaw will probably occur in <20% of the permafrost zone but could affect half of permafrost carbon through collapsing ground, rapid erosion and landslides. Here, we...

Turetsky, Merritt R.; Abbott, Benjamin W.; Jones, Miriam C.; Walter Anthony, Katey; Olefeldt, David; Schuur, Edward A.G.; Grosse, Guido; Kuhry, Peter; Hugelius, Gustaf; Koven, Charles; Lawrence, David M.; Gibson, Carolyn; Sannel, A. Britta K.; McGuire, A.D.

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Year Published: 2020

Estimating late 19th century hydrology in the Greater Everglades Ecosystem: An integration of paleoecologic data and models

Determining hydrologic conditions prior to instrumental records is a challenge for restoration of freshwater ecosystems worldwide. Paleoecologic data provide this information on past conditions and when these data are used to adjust hydrologic models, allow conditions to be hindcast that may not be directly estimated from the paleo-data alone. In...

Marshall, Frank E.; Bernhardt, Christopher E.; Wingard, G. Lynn

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Year Published: 2019

Impacts of Hurricane Irma on Florida Bay Islands, Everglades National Park, U.S.A.

Hurricane Irma made landfall in south Florida, USA, on September 10, 2017 as a category 4 storm. In January 2018, fieldwork was conducted on four previously (2014) sampled islands in Florida Bay, Everglades National Park to examine changes between 2014 and 2018. The objectives were to determine if the net impact of the storm was gain or loss of...

Wingard, G. Lynn; Bergstresser, Sarah E.; Stackhouse, Bethany; Jones, Miriam; Marot, Marci E.; Hoefke, Kristen; Daniels, Andre; Keller, Katherine

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Year Published: 2019

Detailed Lithologic Logs from Auger Holes in southern Charleston County, southwestern Dorchester County, and eastern Colleton County, South Carolina

The lithologic logs described in this open-file report are from holes augered in the South Carolina Low Country in parts of Charleston, Dorchester, and Colleton Counties from 1998 through 2010. Lithologic units described here include not only surficial Pleistocene units but also subsurface stratigraphic units ranging as far back in age as late...

Weems, Robert E.; Lewis, William C.
Weems, R.E., and Lewis, W.C., 2019, Detailed lithologic logs from auger holes in southern Charleston County, southwestern Dorchester County, and eastern Colleton County, South Carolina: U.S. Geological Survey Open-File Report 2019–1119, 129 p., https://doi.org/10.3133/ofr20191119.

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Year Published: 2019

La Niña-driven flooding in the Indo-Pacific warm pool during the past millennium

Extreme precipitation events are one of the most consequential components of climate change for society. The El Niño-Southern Oscillation (ENSO) is the dominant mode of precipitation variability in the tropics and causes severe flooding and drought in many socioeconomically vulnerable regions. It remains unclear how tropical rainfall extremes and...

Rodysill, Jessica; Russell, James M.; Vuille, Mathias; Dee, Sylvia; Lunghino, Brent D.; Bijaksana, Satria

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Year Published: 2019

Paleoliquefaction field reconnaissance in eastern North Carolina—Is there evidence for large magnitude earthquakes between the central Virginia seismic zone and Charleston seismic zone?

In June 2016, approximately 64 kilometers (km) of riverbank were examined along the Tar and Neuse Rivers near Tarboro and Kinston, North Carolina, for evidence of liquefaction-forming earthquakes. The study area is in the vicinity of the Grainger’s fault zone in eastern North Carolina. The Grainger’s fault zone is a fault zone in the inner Coastal...

Carter, Mark W.; McLaurin, Brett T.
Carter, M.W., and McLaurin, B.T., 2019, Paleoliquefaction field reconnaissance in eastern North Carolina—Is there evidence for large magnitude earthquakes between the Central Virginia Seismic Zone and Charleston Seismic Zone?: U.S. Geological Survey Scientific Investigations Report 2019–5057, 54 p., https://doi.org/10.3133/sir20195057.

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Year Published: 2019

Mid-piacenzian of the north Atlantic Ocean

The Piacenzian Age (Pliocene) represents a past climate interval within which frequency and magnitude of environmental changes during a period of past global warmth can be analyzed, climate models can be tested, and results can be placed in a context to better prepare for future change. Here we focus on the North Atlantic region, incorporating new...

Dowsett, Harry J.; Robinson, Marci M.; Foley, Kevin M.; Herbert, Timothy D.; Otto-Bliesner, Bette L.; Spivey, Whittney

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Year Published: 2019

(U-Th)/He zircon dating of Chesapeake Bay distal impact ejecta from ODP site 1073

Single crystal (U‐Th)/He dating has been undertaken on 21 detrital zircon grains extracted from a core sample from Ocean Drilling Project (ODP) site 1073, which is located ~390 km northeast of the center of the Chesapeake Bay impact structure. Optical and electron imaging in combination with energy dispersive X‐ray microanalysis (EDS) of...

Biren, M.B.; Wartho, J.-A.; van Soest, M.C.; Hodges, K.V.; Cathey, H.; Glass, B.P.; Koeberl, C.; Horton, J. Wright; Hale, W.

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Year Published: 2019

Lithostratigraphic, geophysical, and hydrogeologic observations from a boring drilled to bedrock in glacial sediments near Nantucket Sound in East Falmouth, Massachusetts

In spring 2016, a 310-foot-deep boring (named MA–FSW 750) was drilled by the U.S. Geological Survey near Nantucket Sound in East Falmouth, Massachusetts, to investigate the hydrogeology of the southern coast of western Cape Cod. Few borings that are drilled to bedrock exist in the area, and the study area was selected to fill a gap between...

Hull, Robert B.; Johnson, Carole D.; Stone, Byron D.; LeBlanc, Denis R.; McCobb, Timothy D.; Phillips, Stephanie N.; Pappas , Katherine L. ; Lane, Jr., John W.
Hull, R.B, Johnson, C.D., Stone, B.D., LeBlanc, D.R., McCobb, T.D., Phillips, S.N., Pappas, K.L., and Lane, J.W., 2019, Lithostratigraphic, geophysical, and hydrogeologic observations from a boring drilled to bedrock in glacial sediments near Nantucket sound in East Falmouth, Massachusetts: U.S. Geological Survey Scientific Investigations Report 2019–5042, 27 p., https://doi.org/10.3133/sir20195042.

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Year Published: 2019

Endless forams: >34,000 modern planktonic foraminiferal images for taxonomic training and automated species recognition using convolutional neural networks

Accurate planktonic foraminiferal species identification is central to many paleoceanographic studies, from selecting specific species for geochemical research to elucidating the biotic dynamics of microfossil communities relevant to physical oceanographic processes and interconnected phenomena such as climate change. However, species...

Hsiang, Allison Y.; Brombacher, Anieke; Costa Rillo, Marina; Mleneck-Vautravers, Maryline J.; Connett, Stephen; Lordsmith, Sian; Jentzen, Anna; Henehan, Michael J.; Metcalfe, Brett; Fenton, Isabel; Wade, Bridget; Fox, Lyndsey; Meilland, Julie; Davis, Catherine V.; Baranowski, Ulrike; Groeneveld, Jeroen; Edgar, Kirsty M.; Movellan, Aurore; Aze, Tracy; Dowsett, Harry J.; Miller, Giles; Rios, Nelson; Hull, Pincelli M.
Hsiang, A. Y., Brombacher, A. , Rillo, M. C., Mleneck‐Vautravers, M. J., Conn, S. , Lordsmith, S. , Jentzen, A. , Henehan, M. J., Metcalfe, B. , Fenton, I. S., Wade, B. S., Fox, L. , Meilland, J. , Davis, C. V., Baranowski, U. , Groeneveld, J. , Edgar, K. M., Movellan, A. , Aze, T. , Dowsett, H. J., Miller, C. G., Rios, N. and Hull, P. M. (2019), Endless Forams: >34,000 Modern Planktonic Foraminiferal Images for Taxonomic Training and Automated Species Recognition Using Convolutional Neural Networks. Paleoceanography and Paleoclimatology, 34: 1157-1177. doi:10.1029/2019PA003612

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Year Published: 2019

Rapid inundation of the southern Florida coastline despite low relative sea-level rise rates during the late-Holocene

Sediment cores from Florida Bay, Everglades National Park were examined to determine ecosystem response to relative sea-level rise (RSLR) over the Holocene. High-resolution multiproxy analysis from four sites show freshwater wetlands transitioned to mangrove environments 4–3.6 ka, followed by estuarine environments 3.4–2.8 ka, during a period of...

Jones, Miriam; Wingard, G. Lynn; Stackhouse, Bethany; Keller, Katherine; Willard, Debra A.; Marot, Marci E.; Landacre, Bryan D.; Bernhardt, Christopher E.