Crater Name  Location  Latitude  Longitude  Diameter (km)  Age (Ma)  Exposed  Drilled  Target Rock**  Bolide Type***
 Obolon'  Ukraine  N 49° 35'  E 32° 55'  20  169 ± 7  N  Y  M  Iron?

A. Schematic cross-section of the Obolon impact structure in the NW-SE direction (from Gurov et al., 2000): 1 - overlaying sediments; 2 - filling sediments; 3 - allogenous impact rocks; 4 - pre-impact sediments of the crater basement; 5 - rocks of the crystalline basement. B. Sections of the filling and allogenous rocks of Obolon impact structure in the boreholes Nos 6301 and 5302: 1 - clays, shales; 2 - sandstones; 3 - allogenous breccias; 4 - rocks of the crystalline basement


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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)