Publications
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Paleontological interpretations of crater processes and infilling of synimpact sediments from the Chesapeake Bay impact structure Paleontological interpretations of crater processes and infilling of synimpact sediments from the Chesapeake Bay impact structure
Biostratigraphic analysis of sedimentary breccias and diamictons in the Chesapeake Bay impact structure provides information regarding the timing and processes of late-stage gravitational crater collapse and ocean resurge. Studies of calcareous nannofossil and palynomorph assemblages in the International Continental Scientific Drilling Program (ICDP)-U.S. Geological Survey (USGS)...
Authors
Jean Self-Trail, Lucy E. Edwards, Ronald J. Litwin
High-resolution seismic-reflection images across the ICDP-USGS Eyreville deep drilling site, Chesapeake Bay impact structure High-resolution seismic-reflection images across the ICDP-USGS Eyreville deep drilling site, Chesapeake Bay impact structure
The U.S. Geological Survey (USGS) acquired two 1.4-km-long, high-resolution (~5 m vertical resolution) seismic-reflection lines in 2006 that cross near the International Continental Scientific Drilling Program (ICDP)–USGS Eyreville deep drilling site located above the late Eocene Chesapeake Bay impact structure in Virginia, USA. Five-meter spacing of seismic sources and geophones...
Authors
David S. Powars, Rufus D. Catchings, Mark R. Goldman, Gregory Gohn, J. Wright Horton,, Lucy E. Edwards, Michael J. Rymer, G. Gandhok
Geologic columns for the ICDP-USGS Eyreville A and B cores, Chesapeake Bay impact structure: Sediment-clast breccias, 1096 to 444 m depth Geologic columns for the ICDP-USGS Eyreville A and B cores, Chesapeake Bay impact structure: Sediment-clast breccias, 1096 to 444 m depth
The Eyreville A and B cores, recovered from the “moat” of the Chesapeake Bay impact structure, provide a thick section of sediment-clast breccias and minor stratified sediments from 1095.74 to 443.90 m. This paper discusses the components of these breccias, presents a geologic column and descriptive lithologic framework for them, and formalizes the Exmore Formation. From 1095.74 to ~867...
Authors
Lucy E. Edwards, David S. Powars, Gregory Gohn, H. Dypvik
Mid-Pliocene equatorial Pacific sea surface temperature reconstruction: a multi-proxy perspective Mid-Pliocene equatorial Pacific sea surface temperature reconstruction: a multi-proxy perspective
The Mid-Pliocene is the most recent interval of sustained global warmth, which can be used to examine conditions predicted for the near future. An accurate spatial representation of the low-latitude Mid-Pliocene Pacific surface ocean is necessary to understand past climate change in the light of forecasts of future change. Mid-Pliocene sea surface temperature (SST) anomalies show a...
Authors
Harry J. Dowsett, Marci M. Robinson
Derivation of habitat-specific dissolved oxygen criteria for Chesapeake Bay and its tidal tributaries Derivation of habitat-specific dissolved oxygen criteria for Chesapeake Bay and its tidal tributaries
The Chesapeake 2000 Agreement committed its state and federal signatories to “define the water quality conditions necessary to protect aquatic living resources” in the Chesapeake Bay (USA) and its tidal tributaries. Hypoxia is one of the key water quality issues addressed as a result of the above Agreement. This paper summarizes the protection goals and specific criteria intended to...
Authors
Richard A. Batiuk, Denise L. Breitburg, Robert J. Diaz, Thomas M. Cronin, David H. Secor, Glen Thursby
Report 11 - Revised articles of organization and procedure of the North American commission on stratigraphic nomenclature Report 11 - Revised articles of organization and procedure of the North American commission on stratigraphic nomenclature
No abstract available.
Authors
D.E. Owen, N.P. Lasca, Lucy E. Edwards
Postimpact deposition in the Chesapeake Bay impact structure: Variations in eustasy, compaction, sediment supply, and passive-aggressive tectonism Postimpact deposition in the Chesapeake Bay impact structure: Variations in eustasy, compaction, sediment supply, and passive-aggressive tectonism
The Eyreville and Exmore, Virginia, core holes were drilled in the inner basin and annular trough, respectively, of the Chesapeake Bay impact structure, and they allow us to evaluate sequence deposition in an impact crater. We provide new high-resolution geochronologic (
Authors
A.A. Kulpecz, K.G. Miller, J.V. Browning, Lucy E. Edwards, David S. Powars, P.P. McLaughlin, A.D. Harris, M.D. Feigenson
Bedrock geology of the Montpelier area, central Vermont Bedrock geology of the Montpelier area, central Vermont
No abstract available.
Authors
Gregory J. Walsh, Jonathan Kim, Marjorie H. Gale
High-resolution seismic-reflection images across the ICDP-USGS Eyreville deep drilling site, Chesapeake Bay impact structure High-resolution seismic-reflection images across the ICDP-USGS Eyreville deep drilling site, Chesapeake Bay impact structure
The U.S. Geological Survey (USGS) acquired two 1.4-km-long, high-resolution (~5 m vertical resolution) seismic-reflection lines in 2006 that cross near the International Continental Scientific Drilling Program (ICDP)-USGS Eyreville deep drilling site located above the late Eocene Chesapeake Bay impact structure in Virginia, USA. Five-meter spacing of seismic sources and geophones...
Authors
David S. Powars, Rufus D. Catchings, Mark R. Goldman, Gregory S. Gohn, J. Wright Horton, Lucy E. Edwards, Michael J. Rymer, Gini Gandhok
The Eocene-Oligocene sedimentary record in the Chesapeake Bay impact structure: Implications for climate and sea-level changes on the western Atlantic margin The Eocene-Oligocene sedimentary record in the Chesapeake Bay impact structure: Implications for climate and sea-level changes on the western Atlantic margin
A multidisciplinary investigation of the Eocene-Oligocene transition in the International Continental Scientific Drilling Program (ICDP)-U.S. Geological Survey (USGS) Eyreville core from the Chesapeake Bay impact basin was conducted in order to document environmental changes and sequence stratigraphic setting. Planktonic foraminifera and calcareous nannofossil biostratigraphy indicate...
Authors
P. Schulte, B.S. Wade, A. Kontny, Jean Self-Trail
Geologic columns for the ICDP-USGS Eyreville A and C cores, Chesapeake Bay impact structure: Postimpact sediments, 444 to 0 m depth Geologic columns for the ICDP-USGS Eyreville A and C cores, Chesapeake Bay impact structure: Postimpact sediments, 444 to 0 m depth
A 443.9-m-thick, virtually undisturbed section of postimpact deposits in the Chesapeake Bay impact structure was recovered in the Eyreville A and C cores, Northampton County, Virginia, within the "moat" of the structure's central crater. Recovered sediments are mainly fine-grained marine siliciclastics, with the exception of Pleistocene sand, clay, and gravel. The lowest postimpact unit...
Authors
Lucy E. Edwards, David S. Powars, J.V. Browning, P.P. McLaughlin, K.G. Miller, A.A. Kulpecz, T. Elbra
A simulation of historic hydrology and salinity in Everglades National Park: Coupling paleoecologic assemblage data with regression models A simulation of historic hydrology and salinity in Everglades National Park: Coupling paleoecologic assemblage data with regression models
Restoration of Florida’s Everglades requires scientifically supportable hydrologic targets. This study establishes a restoration baseline by developing a method to simulate hydrologic and salinity conditions prior to anthropogenic changes. The method couples paleoecologic data on long-term historic ecosystem conditions with statistical models derived from observed meteorologic and...
Authors
Frank E. Marshall, G. Lynn Wingard, Patrick A. Pitts