Crater Name  Location  Latitude  Longitude  Diameter (km)  Age (Ma)  Exposed  Drilled  Target Rock**  Bolide Type***
 Gardnos  Norway  N 60° 39'  E 9° 0'  5  500 ± 10  Y  N  C  Chondrite

Geology map


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Grier, J. A., Swindle, T.D., Kring, D.A. and Melosh,H.J., Investigation of the Gardnos impact structure: Argon-40/Argon-39 results (abstract). Meteoritics, v. 30, pp. 513-514. 1995.
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Wolbach, W. S., French, B. M., Widicus., Carbon- Bearing Impactites from the Gardnos Impact Structure, Norway: No Evidence for Soot, LPSC XXX, Lunar and Planetary Institute, Houston, TX, Abstr. 1043 (CD-ROM). 1999.
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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)