manicouagan

Calvin

 Crater Name  Location  Latitude  Longitude  Diameter (km)  Age (Ma)  Exposed  Drilled  Target Rock**  Bolide Type***
 Calvin  Michigan, USA  N 41° 50'  W 85° 57'  8.5  450 ± 10  N  Y  S  -

Map

References
Buthman, D. B., Global hydrocarbon potential of impact structures. Ames Structure in Northwest Oklahoma and Similar Features: Origin and Petroleum Production (1995 Symposium), K. S. Johnson and J. A. Campbell, Oklahoma Geological Survey, Norman, Oklahoma, v. Circular 100, pp. 83-99. 1997.
Donofrio, R. R., Survey of hydrocarbon-producing impact structures in North America: Exploration results to date and potential for discovery in Precambrian basement rock. Ames Structure in Northwest Oklahoma and Similar Features: Origin and Petroleum Production (1995 Symposium), K. S. Johnson and J. A. Campbell, Oklahoma Geological Survey, Norman, Oklahoma, v. Circular 100, pp. 17-29. 1997.
Milstein, R. L., The Calvin impact crater, Cass County, Michigan: Identification and analysis of a subsurface Ordovician astrobleme (abstract). Ames Structure and Similar Features - A Workshop -, p. 37. 1995.
Milstein, R. L., The Calvin impact crater, Cass County, Michagan: Identification and anlaysis of a subsurface Ordovician astrobleme. Ph. D. Ph.D. Thesis, Oregon State University, 86. 1994.
Milstein, R. L., Impact origin of the Calvin 28 cryptoexplosive distrunbance, Cass County, Michigan. Michigan Department of Natural Resources, Geological Survey Division, v. Report of Investigation 28, pp. 1-33. 1988.
Milstein, R. L., The Calvin 28 structure: Evidence for impact origin. Canadian Journal of Earth Sciences, v. 25, pp. 1524-1530. 1988.
Milstein, R. L., The Calvin 28 cryptoexplosive distrubance, Cass County, Michigan. Geological Society of America Centennial Field Guide - North-Central Section, pp. 315-320. 1987.
Naeye, R., The hole in Nebraska. Discover, p. s. 1993.
Westbroek, H., Stewart, R., The formation, morphology, and economic potential of meteorite impact craters, CREWES Research Report v. 8, p. 1-26. 1996.
* 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)