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Middlesboro

 Crater Name  Location  Latitude  Longitude  Diameter (km)  Age (Ma)  Exposed  Drilled  Target Rock**  Bolide Type***
 Middlesboro  Kentucky, U.S.A.  N 36° 37'  W 83° 44'  6  < 300  Y  Y  S  -

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

References
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., Deane B., Petrogenesis of central uplifts in complex terrestrial impact craters, 2005.
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)