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



Crater Name
Diameter (km)
Age (Ma)*
Target Rock**
Bolide Type***
Kentucky, U.S.A.
N 36° 37'
W 83° 44'
< 300


Aerial photographs - Kentucky Geological Survey.
The rim of the impact feature is visible in the right portion.
Courtesy of the website of Gary J. Ferland, U of Kentucky

Black, D. F. B., Cryptoexplosive structure near Versailles, Kentucky. U.S. Geology Survey Professional Paper 501-B, pp. B9-12. 1964.
Cockell, C. S., Lee, P., The Biology of Impact Craters - a review. Biol. Rev., 77, P. 279 - 310. 2002.
Dietz, R. S., Shatter cones at the Middlesboro structure, Kentucky. Meteoritics, v. 3, pp. 27-29. 1966.
Englund, K. J., Roen, K.J. and DeLaney,A.O., Geology of the Middlesboro north quadrangle, Kentucky. U.S. Geological Survey Geologic Quadrangle Map GQ-300, scale 1:24,000. 1964.
Englund, K. J., Geology of the Middlesboro south quadrangle, Tennessee-Kentucky-Virginia. U.S. Geological Survey Geologic Quadrangle Map GQ-301, scale 1:24,000. 1964.
Englund, K. J., Roen, J. B., Origin of the Middlesboro basin, Kentucky. U.S. Geological Survey Professional Paper 450-E, pp. E20-E22. 1963.
Grieve, R. A. F., The record of impact on Earth: Implications for a major Cretaceous/Tertiary impact event. Geological Society of America, Special Paper 190, pp. 25-37. 1982.
Gurov, E. P., Gurova, E. P., Impact structures on the Earth's surface (in Russian). Geologicheskii Zhurnal, v. 47, pp. 117-124. 1987.
Masaitis, V. L., Danilin, A.N., Maschak, M.S., Raykhlin, A.I., Selivanovskaya, T.V. and Shadenkov,Ye.M., The Geology of Astroblemes (in Russian). Leningrad, Nedra, 231 p. 1980.
Milam, K. A., Kuehn, K. W., Middlesboro, KY: Further evidence for an impact origin, 1999 GSA Annual Meeting - Denver, Colorado. Abs. No. 52183. 1999.
Seeger, C. R., Geophysical investigations of the Versailles cryptoexplosion structure, and the Middlesboro basin cryptoexplosion structure, Kentucky (abstract). EOS, v. 51, p. 342. 1970.
Steinemann, C. F., A gravity study of the Middlesboro cryptoexplosive structure. Thesis, University of Kentucky, 41 p. 1980.


* 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)



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