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| U.S. Geological Survey Professional Paper 1688 |
Published 2005
Version 1.0
Edited by J. Wright Horton, Jr., David S. Powars, and Gregory S. Gohn
The late Eocene Chesapeake Bay impact structure of southeastern Virginia may be Earth's best preserved large impact crater formed in a siliciclastic continental shelf environment. The 85-kilometer-wide structure contains saline ground water and has a profound influence on water quality. The USGS-NASA Langley corehole is the first corehole to sample the entire crater fill section down to crystalline basement. The chapters in this volume present scientific results from that corehole, related coreholes, and geophysical surveys.
This report is available in Adobe Reader format. Right-click (PC) or control-click (Macintosh) on the links to download the PDF files. Each chapter is Section-508 compliant.
| Chapter | Chapter Title | PDF Link |
|---|---|---|
| Front, Back, and Inside Covers | 625 KB | |
| Front Materials | 540 KB | |
| A. | Studies of the Chesapeake Bay Impact Structure -- Introduction and Discussion, by J. Wright Horton, Jr., David S. Powars, and Gregory S. Gohn |
1.9 MB 1.5 MB [Section 508] |
| B. | Petrography, Structure, Age, and Thermal History of Granitic Coastal Plain Basement in the Chesapeake Bay Impact Structure, USGS-NASA Langley Core, Hampton, Virginia, by J. Wright Horton, Jr., John N. Aleinikoff, Michael J. Kunk, Charles W. Naeser, and Nancy D. Naeser |
2.9 MB |
| C. | Physical Geology of the Impact-Modified and Impact-Generated Sediments in the USGS-NASA Langley Core, Hampton, Virginia, by Gregory S. Gohn, David S. Powars, T. Scott Bruce, and Jean M. Self-Trail |
3.5 MB |
| D. | Paleontology of the Impact-Modified and Impact-Generated Sediments in the USGS-NASA Langley Core, Hampton, Virginia, by Norman O. Frederiksen, Lucy E. Edwards, Jean M. Self-Trail, Laurel M. Bybell, and Thomas M. Cronin |
2.5 MB |
| E. | Crystalline-Rock Ejecta and Shocked Minerals of the Chesapeake Bay Impact Structure, USGS-NASA Langley Core, Hampton, Virginia, with Supplemental Constraints on the Age of Impact, by J. Wright Horton, Jr., and Glen A. Izett |
2.6 MB |
| F. | Stratigraphy and Paleoenvironments of Early Postimpact Deposits at the USGS-NASA Langley Corehole, Chesapeake Bay Impact Crater, by C. Wylie Poag and Richard D. Norris |
7 MB 6.6 MB [Section 508] |
| G. | Physical Stratigraphy of the Upper Eocene to Quaternary Postimpact Section in the USGS-NASA Langley Core, Hampton, Virginia, by David S. Powars, T. Scott Bruce, Lucy E. Edwards, Gregory S. Gohn, Jean M. Self-Trail, Robert E. Weems, Gerald H. Johnson, Matthew J. Smith, and Colleen T. McCartan |
5.9 MB |
| H. | Paleontology of the Upper Eocene to Quaternary Postimpact Section in the USGS- NASA Langley Core, Hampton, Virginia, by Lucy E. Edwards, John A. Barron, David Bukry, Laurel M. Bybell, Thomas M. Cronin, C. Wylie Poag, Robert E. Weems, and G. Lynn Wingard |
5 MB |
| Fig. H4. | Occurrence chart showing the presence of calcareous nannofossils in samples from the postimpact units in the USGS-NASA Langley core [17 x 21 inches] | 480 KB |
| Fig. H6. | Occurrence chart showing the presence of mollusks in samples from the Chickahominy, Old Church, Calvert, St. Marys, Eastover, and Yorktown Formations in the USGS-NASA Langley core [19 x 20 inches] | 430 KB |
| I. | High-Resolution Seismic-Reflection Image of the Chesapeake Bay Impact Structure, NASA Langley Research Center, Hampton, Virginia, by Rufus D. Catchings, David S. Powars, Gregory S. Gohn, and Mark R. Goldman [The 15-MB version contains very high resolution seismic profiles for figures I6-I11.] |
15 MB 3.6 MB [Section 508] |
| J. | Audio-Magnetotelluric (AMT) Soundings across the Margin of the Chesapeake Bay Impact Structure, York-James and Middle Peninsulas, Virginia, by Herbert A. Pierce |
2.7 MB 2.5 MB [Section 508] |
| K. | Distribution, Origin, and Resource-Management Implications of Ground-Water Salinity along the Western Margin of the Chesapeake Bay Impact Structure in Eastern Virginia, by E. Randolph McFarland and T. Scott Bruce |
1.2 MB |
The printed version of this publication is available from the USGS Store:
USGS Information Services, Box 25286,
Federal Center, Denver, CO 80225
e-mail: infoservices@usgs.gov
Telephone: 1-888-ASK-USGS.
For questions about the content of this report, contact J. Wright Horton, Jr.
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