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Chesapeake Bay Impact Structure Deep Drilling Project

Project Acronym: CBAY | State: Completed | Expedition ID: 5001

The late Eocene Chesapeake Bay impact structure is among the largest and best preserved impact craters on Earth.

The subsurface structure of the Chesapeake Bay crater is constrained by several shallow coreholes, marine seismic-reflection surveys, and gravity analyses. Major subdivisions of the structure are a circa 38-km-diameter central crater, enclosed by a 24-km-wide annular trough. 

Research topics include studies of impact processes, regional basin evolution (comparing impact effects with "normal" effects produced by tectonics, global sea-level, and sediment supply on a passive continental margin), hydrogeology, borehole and regional geophysics, and the deep biosphere.

Keywords: North America, USA, Virginia, Chesapeake Bay, Cenozoic Sequence, Climate Change, Eocene, Global Environment, Impact Crater, Paleoclimatology, Sea-level Changes


Cores are stored at U.S. Geological Survey, Core Research Center, Denver, USA.

Project Details

Project Location

Project Timeline

Sampling Party

15 June 2006

Drilling 2

1 April - 31 May 2006

Drilling 1

15 September - 9 December 2005

Full Proposal Approved

Workshop Held

22 - 24 September 2003 in Reston, Virginia, USA

Workshop Proposal Approved