Publications
Filter Total Items: 921
Chesapeake Bay impact structure: A blast from the past Chesapeake Bay impact structure: A blast from the past
About 35 million years ago, a 2-mile-wide meteorite smashed into Earth in what is now the lower Chesapeake Bay in Virginia. The oceanic impact vaporized, melted, fractured, and displaced rocks and sediments and sent billions of tons of water, sediments, and rocks into the air. Glassy particles of solidified melt rock rained down as far away as Texas and the Caribbean. Large tsunamis...
Authors
David S. Powars, Lucy E. Edwards, Gregory S. Gohn, J. Wright Horton
Geologic map of Kundelan ore deposits and prospects, Zabul Province, Afghanistan; modified from the 1971 original map compilations of K.I. Litvinenko and others Geologic map of Kundelan ore deposits and prospects, Zabul Province, Afghanistan; modified from the 1971 original map compilations of K.I. Litvinenko and others
This map and cross sections are redrafted modified versions of the Geological map of the Kundelan ore deposit area, scale 1:10,000 (graphical supplement no. 18) and the Geological map of the Kundelan deposits, scale 1:2,000 (graphical supplement no. 3) both contained in an unpublished Soviet report by Litvinenko and others (1971) (report no. 0540). The unpublished Soviet report was...
Authors
Robert D. Tucker, Stephen G. Peters, Will R. Stettner, Linda M. Masonic, Thomas W. Moran
On the reconstruction of palaeo-ice sheets: Recent advances and future challenges On the reconstruction of palaeo-ice sheets: Recent advances and future challenges
Reconstructing the growth and decay of palaeo-ice sheets is critical to understanding mechanisms of global climate change and associated sea-level fluctuations in the past, present and future. The significance of palaeo-ice sheets is further underlined by the broad range of disciplines concerned with reconstructing their behaviour, many of which have undergone a rapid expansion since the...
Authors
Chris R. Stokes, Lev Tarasov, Robin Blomdin, Thomas M. Cronin, Timothy G. Fisher, Richard Gyllencreutz, Clas Hattestrand, Jakob Heyman, Richard C. A. Hindmarsh, Anna L. C. Hughes, Martin Jakobsson, Nina Kirchner, Stephen J. Livingstone, Martin Margold, Julian B. Murton, Riko Noormets, W. Richard Peltier, Dorothy M. Peteet, David J. W. Piper, Frank Preusser, Hans Renssen, David H. Roberts, Didier M. Roche, Francky Saint-Ange, Arjen P. Stroeven, James T. Teller
Accommodation space, relative sea level, and the archiving of paleo-earthquakes along subduction zones Accommodation space, relative sea level, and the archiving of paleo-earthquakes along subduction zones
The spatial variability of Holocene relative sea-level (RSL) change influences the capacities of coastal environments to accommodate a sedimentary record of paleoenvironmental change. In this study we couch a specific investigation in more general terms in order to demonstrate the applicability of the relative sea-level history approach to paleoseismic investigations. Using subsidence...
Authors
Harvey M. Kelsey, Simon E. Engelhart, Jessica E. Pilarczyk, Benjamin P. Horton, Charles Rubin, Mudrik Daryono, Nazli Ismail, Andrea D. Hawkes, Christopher E. Bernhardt, Niamh Cahill
Volcanic ash hazards and aviation risk: Chapter 4 Volcanic ash hazards and aviation risk: Chapter 4
The risks to safe and efficient air travel from volcanic-ash hazards are well documented and widely recognized. Under the aegis of the International Civil Aviation Organization, globally coordinated mitigation procedures are in place to report explosive eruptions, detect airborne ash clouds and forecast their expected movement, and issue specialized messages to warn aircraft away from...
Authors
Marianne C. Guffanti, Andrew C. Tupper
The geology of Burnsville Cove, Bath and Highland Counties, Virginia The geology of Burnsville Cove, Bath and Highland Counties, Virginia
Burnsville Cove is a karst region in Bath and Highland Counties of Virginia. A new geologic map of the area reveals various units of limestone, sandstone, and siliciclastic mudstone (shale) of Silurian through Devonian age, as well as structural features such as northeast-trending anticlines and synclines, minor thrust faults, and prominent joints. Quaternary features include erosional...
Authors
Christopher S. Swezey, John T. Haynes, Richard A. Lambert, William B. White, Philip C. Lucas, Christopher P. Garrity
NACSN, note 67--Application for revision of Articles 36 and 37, Lithodemic units of the North American stratigraphic code NACSN, note 67--Application for revision of Articles 36 and 37, Lithodemic units of the North American stratigraphic code
Currently the North American Stratigraphic Code, (NACSN 2005, Article 37) sets restrictions on the use of the term “complex” for lithodemic units. With exceptions for “volcanic complex” and “structural complex,” a complex must consist of more than one genetic class of rock (i.e., sedimentary, igneous or metamorphic). Thus, the use of the term “complex” to describe masses of intrusive...
Authors
Robert M. Easton, Lucy E. Edwards, Randall C. Orndorff, Manuel Duguet, Ismael Ferrusquia-Villafranca
Synthesis on Quaternary aeolian research in the unglaciated eastern United States Synthesis on Quaternary aeolian research in the unglaciated eastern United States
Late-middle and late Pleistocene, and Holocene, inland aeolian sand and loess blanket >90,000 km2 of the unglaciated eastern United States of America (USA). Deposits are most extensive in the Lower Mississippi Valley (LMV) and Atlantic Coastal Plain (ACP), areas presently lacking significant aeolian activity. They provide evidence of paleoclimate intervals when wind erosion and...
Authors
Helaine W. Markewich, Ronald J. Litwin, Douglas A. Wysocki, Milan J. Pavich
Comparison of three preservation techniques for slowing dissolution of calcareous nannofossils in organic rich sediments Comparison of three preservation techniques for slowing dissolution of calcareous nannofossils in organic rich sediments
In an attempt to halt or reduce dissolution of calcareous nannofossils in organic and/or pyrite-rich sediments, three different methods of short-term storage preservation were tested for efficacy: vacuum packing, argon gas replacement, and buffered water. Abundance counts of calcareous nannofossil assemblages over a six month period showed that none of the three preservation methods were...
Authors
Ellen Seefelt, Jean Self-Trail, Arthur P. Schultz
Ordovician of Germany Valley, West Virginia: 12th International Symposium on the Ordovician System mid-conference field trip Ordovician of Germany Valley, West Virginia: 12th International Symposium on the Ordovician System mid-conference field trip
No abstract available.
Authors
John T. Haynes, Keith E. Goggin, Randall C. Orndorff
Modelling the enigmatic Late Pliocene Glacial Event - Marine Isotope Stage M2 Modelling the enigmatic Late Pliocene Glacial Event - Marine Isotope Stage M2
The Pliocene Epoch (5.2 to 2.58 Ma) has often been targeted to investigate the nature of warm climates. However, climate records for the Pliocene exhibit significant variability and show intervals that apparently experienced a cooler than modern climate. Marine Isotope Stage (MIS) M2 (~ 3.3 Ma) is a globally recognisable cooling event that disturbs an otherwise relatively (compared to...
Authors
Aisling M. Dolan, Alan M. Haywood, Stephen J. Hunter, Julia C. Tindall, Harry J. Dowsett, Daniel J. Hill, Steven J. Pickering
Testing a small UAS for mapping artisanal diamond mining sites in Africa Testing a small UAS for mapping artisanal diamond mining sites in Africa
Remote sensing technology is advancing at an unprecedented rate. At the forefront of the new technological developments are unmanned aircraft systems (UAS). The advent of small, lightweight, low-cost, and user-friendly UAS is greatly expanding the potential applications of remote sensing technology and improving the set of tools available to researchers seeking to map and monitor terrain...
Authors
Katherine C. Malpeli, Peter G. Chirico