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Earth Impact Database Sorted by : | Age | Diameter | Name |

 

Chesapeake Bay

Crater Name
Location
Latitude
Longitude
Diameter (km)****
Age (Ma)*
Exposed
Drilled
Target Rock**
Bolide Type***
Chesapeake Bay
Virginia, U.S.A.
N 37° 17'
W 76° 1'
40
35.5 ± 0.3
N
Y
M
-

 

3D model of the crater looking obliquely to the north. Supplied by C. Wylie Poag

Cross Section Diagram by C. Wylie Poag USGS

Gravity Map

 

References
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Wright Horton Jr., J., et al., Geologic columns for the ICDP-USGS Eyreville B core, Chesapeake Bay impact structure: Impactites and crystalline rocks, 1766 to 1096 m depth, Special Paper of the Geological Society of America, Issue 458, pp. 21-49, 2009

 

* pre-1977 K-Ar, Ar-Ar and Rb-Sr ages recalculated using the decay constants of Steiger and Jager (1977) Ages in millions of years (Ma) before present.

** Abbreviations: C - Crystalline Target; C-Ms - Metasedimentary Target; M - Mixed Target (i.e.sedimentary strata overlying crystalline basement); S - sedimentary target (i.e. no crystalline rocks affected by the impact event). From Osinski. G. R., Spray J. G., and Grieve R. A. F. 2007. Impact melting in sedimentary target rocks: A synthesis. In The Sedimentary Record of Meteorite Impacts, Geological Society of America Special Paper. Editors: Evans K. Horton W., King D., Morrow J., and Warme J. Geological Society of America: Boulder, in press.

***
From Koeberl,C. Identification of meteoritic components in impactites. 1998, Koeberl, C. The Geochemistry and Cosmochemistry of Impacts. 2007 and PASSC Files. (IAB, IIIAB, IIIB, IIID - Iron Meteorite)

****This revised diameter is the best estimate for the collapsed transient crater diameter (rim-to-rim dimension). Our previous diameters cited maximum damage diameter estimates. There is considerable confusion in the literature regarding the definition of "diameter". In the Earth Impact Database, we are striving to cite the collapsed transient crater value where possible. This can affect the order of size: for example, Sudbury's maximum damage diameter is ~260 km (as defined by the outermost ring diameter), while that of Chicxulub is ~240 km. However, the rim-to-rim diameter of Sudbury is less than that of Chicxulub's (130 versus 150 km, respectively).

 

 

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