Publications
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PLIOMAX: Pliocene maximum sea level project PLIOMAX: Pliocene maximum sea level project
No abstract available.
Authors
M.E. Raymo, Paul Hearty, R. DeConto, M. O’Leary, Harry Dowsett, Marci Robinson, J.X. Mitrovica
Radiocarbon ages and age models for the past 30,000 years in Bear Lake, Utah and Idaho Radiocarbon ages and age models for the past 30,000 years in Bear Lake, Utah and Idaho
Radiocarbon analyses of pollen, ostracodes, and total organic carbon (TOC) provide a reliable chronology for the sediments deposited in Bear Lake over the past 30,000 years. The differences in apparent age between TOC, pollen, and carbonate fractions are consistent and in accord with the origins of these fractions. Comparisons among different fractions indicate that pollen sample ages...
Authors
Steve Colman, Robert Rosenbauer, Darrell Kaufman, Walter Dean, John McGeehin
Interacción termal entre magmas graníticos laramídicos y rocas encajonantes mesoproterozoicas: Historia de enfriamiento de intrusivos de la sierrita blanca, NW Sonora Interacción termal entre magmas graníticos laramídicos y rocas encajonantes mesoproterozoicas: Historia de enfriamiento de intrusivos de la sierrita blanca, NW Sonora
A semi-quantitative thermochronological study, combining U-Pb and 40Ar/39Ar geochronology, has allowed assessment of the crystallization and cooling history of the Laramide Sierrita Blanca granite as well as the thermal effects resulting from the intrusion into the Mesoproterozoic host rocks (~1.1 Ga Murrieta granite). The U-Pb zircon age discrepancy between two samples of the Sierrita...
Authors
Monica Enriquez-Castillo, Alexander Iriondo, Gabriel Chavez-Cabello, Michael Kunk
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 Dowsett, Marci Robinson
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 Edwards, Ronald 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 Powars, Rufus Catchings, Mark Goldman, Gregory Gohn, J. Wright Horton,, Lucy Edwards, Michael 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 Edwards, David Powars, Gregory Gohn, H. Dypvik
Bedrock geology of the Montpelier area, central Vermont Bedrock geology of the Montpelier area, central Vermont
No abstract available.
Authors
Gregory Walsh, Jonathan Kim, Marjorie 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 Powars, Rufus Catchings, Mark Goldman, Gregory S. Gohn, J. Wright Horton, Lucy Edwards, Michael Rymer, Gini Gandhok
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 Batiuk, Denise Breitburg, Robert Diaz, Thomas Cronin, David 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 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 Edwards, David Powars, P.P. McLaughlin, A.D. Harris, M.D. Feigenson