Glover Bluff

 Crater Name  Location  Latitude  Longitude  Diameter (km)  Age (Ma)  Exposed  Drilled  Target Rock**  Bolide Type***
 Glover Bluff  Wisconsin, U.S.A.  N 43° 58'  W 89° 32'  8  < 500  Y  Y  S  -

Topographic Map


Cannon, W. F., Mudrey, M. G. Jr., The potential for diamond-bearing kimberlite in Northern Michigan and Wisconsin. U.S. Geological Survey Circular 842, 15 p. 1981.
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Dietz, R. S., McHone, J. F., Astroblemes recently confirmed with shatter cones (abstract). Meteoritics, v. 26, p. 332. 1991.
Ekern, G. L., Thwaites, F., The Glover Bluff structure, a disturbed area in the Paleozoics of Wisconsin. Wisconsin Academy of Sciences, Transactions, v. 25, pp. 89-97. 1930.
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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.
Read, W. F., Impact bombs in Middle Ordovician marine sediments of southeastern Wisconsin (abstract). Lunar and Planetary Science XVI, pp. 687-688. 1985.
Read, W. F., The circular structure at Glover Bluff: What and where it is (abstract). Meteoritics, v. 19, pp. 295-296. 1984.
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* 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)