Publications
Filter Total Items: 824
(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 zircon grains from this late Eocene sediment shows clear evi
Authors
M.B. Biren, J.-A. Wartho, M.C. van Soest, K.V. Hodges, H. Cathey, B.P. Glass, C. Koeberl, J. Wright Horton, W. Hale
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 comprehensive geologic datasets inland to the north and ma
Authors
Robert B. Hull, Carole D. Johnson, Byron D. Stone, Denis R. LeBlanc, Timothy D. McCobb, Stephanie N. Phillips, Katherine L. Pappas, John W. Lane
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 identification varies among taxonomic schools, few resources ex
Authors
Allison Y. Hsiang, Anieke Brombacher, Marina Costa Rillo, Maryline J. Mleneck-Vautravers, Stephen Connett, Sian Lordsmith, Anna Jentzen, Michael J. Henehan, Brett Metcalfe, Isabel Fenton, Bridget Wade, Lyndsey Fox, Julie Meilland, Catherine V. Davis, Ulrike Baranowski, Jeroen Groeneveld, Kirsty M. Edgar, Aurore Movellan, Tracy Aze, Harry J. Dowsett, Giles Miller, Nelson Rios, Pincelli M. Hull
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 enhanced climate variability. We calculate a RSLR ra
Authors
Miriam Jones, G. Lynn Wingard, Bethany Stackhouse, Katherine Keller, Debra A. Willard, Marci E. Marot, Bryan D. Landacre, Christopher E. Bernhardt
Sampling the volatile-rich transition zone beneath Bermuda
Intraplate magmatic provinces found away from active plate boundaries, provide direct sampling of the Earth’s mantle composition and heterogeneity. Observed chemical heterogeneities in the mantle are commonly attributed to recycling during subduction1-3, which allows for the addition of volatiles and incompatible elements into the mantle. Although many intraplate volcanoes sample deep mantle reser
Authors
Sarah E. Mazza, Esteban Gazel, Michael Bizmis, Robert Moucha, Paul Beguelin, Elizabeth A. Johnson, Ryan J. McAleer, Alexander Sobolev
The benthic foraminifera cassidulina from the Arctic Ocean: Application to paleoceanography and biostratigraphy
We investigated the morphology, biostratigraphy, shell stable isotope composition and paleogeography of the common Arctic benthic foraminifera, Cassidulina teretis (Tappan 1951) (sometimes assigned to Islandiella (Nørvang 1958), for application to Quaternary paleoceanography. Cassidulina teretis, which has been studied by several generations of Arctic foraminiferal specialists, is used in Arctic
Authors
Thomas M. Cronin, Julia Seidenstein, Katherine Keller, Kristin McDougall-Reid, Ana Reufer, Laura Gemery
Geology of the Cornwall Quadrangle, Virginia
No abstract available.
Authors
Matthew J. Heller, Mark W. Carter, G.P. Wilkes, R.L. Coiner
Permafrost collapse is accelerating carbon release
This much is clear: the Arctic is warming fast, and frozen soils are starting to thaw, often for the first time in thousands of years. But how this happens is as murky as the mud that oozes from permafrost when ice melts.As the temperature of the ground rises above freezing, microorganisms break down organic matter in the soil. Greenhouse gases — including carbon dioxide, methane and nitrous oxide
Authors
Merritt R. Turetsky, Benjamin W. Abbott, Miriam Jones, Katey Walter Anthony, David Olefeldt, Edward A. Schuur, Charles Koven, A.D. McGuire, Guido Grosse, Peter Kuhry, Gustaf Hugelius, David M. Lawrence, Carolyn Gibson, A. B. K. Sannel
The Appalachian Geo-STEM Camp: Learning about geology through experiential adventure recreation
The inaugural Appalachian Geo-STEM Camp (AGC) was a partnership between West Virginia University (WVU), the U.S. Geological Survey (USGS) and the West Virginia Geological and Economic Survey (WVGES). Designed to engage high school students in geoscience-oriented Science, Technology, Engineering and Mathematics (STEM) activities through adventure-based outdoor recreation, the inaugural AGC took pl
Authors
Robert Burns, Mark W. Carter, John Brock, Jonas Leveque, Emily Bunse, Monica Palaseanu-Lovejoy, Gerald F. Guala, Nathan Harlan, Mitchel Blake, Jasmine Moreira, Jim Britton, Kenny Ashton, Barnes Nugent, Michael Marketti
Stratigraphic occurrences of sub-polar planktic foraminifera in pleistocene sediments on the Lomonosov Ridge, Arctic Ocean
Turborotalita quinqueloba is a species of planktic foraminifera commonly found in the sub-polar North Atlantic along the pathway of Atlantic waters in the Nordic seas and sometimes even in the Arctic Ocean, although its occurrence there remains poorly understood. Existing data show that T. quinqueloba is scarce in Holocene sediments from the central Arctic but abundance levels increase in sediment
Authors
Matt O'Regan, Helen Coxall, Thomas M. Cronin, Richard Gyllencreutz, Martin Jakobsson, Stefanie Kaboth, Ludvig Löwemark, Steffen Wiers, Gabriel West
The Value of Data – The Qatar Geologic Mapping Project
The State of Qatar is in a period of rapid development, modernization, and population growth. One of the most important factors influencing the long-term success and sustainability of future development is a comprehensive understanding of the region’s geologic regime, geotechnical conditions, natural resources, and environmental constraints. To obtain this understanding, the Ministry of Municipal
Authors
Joseph T. Krupansky, Michael A. Knight, Randall Orndorff, Khaled M. Al-Akhras, Ara G. Mouradian, Ali F. Saleh
Environmental and geomorphological changes on the eastern North American Continental Shelf across the Paleocene-Eocene Boundary
Foraminiferal evidence from two sites in southern Maryland, eastern United States, reveals a series of rapid ecological changes on the continental shelf during the onset of the Paleocene-Eocene Thermal Maximum (PETM). Benthic and planktic foraminifer assemblages from the South Dover Bridge (SDB) and Mattawoman Creek-Billingsley Road (MCBR) cores in the central Salisbury Embayment record changing l
Authors
Marci M. Robinson, Whittney Spivey