manicouagan

Iso-Naakkima

 Crater Name  Location  Latitude  Longitude  Diameter (km)  Age (Ma)  Exposed  Drilled  Target Rock**  Bolide Type***
 Iso-Naakkima  Finland  N 62° 11'  E 27° 9'  3  > 1000  N  Y  S  -
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1. Ground photo View from the west shore towards the buried center, which is approx. 50 m away in the center of the picture., Photo Sept. 2001 Submitted by Harald Stehlik

2. Map by Jarmo Moilanen

3. Photograph of the north western part of the crater by Jarmo Moilanen

References
Abels A., Plado J., Pesonen L.J., Lehtinen M., The impact cratering record of Fennoscandia - a close look at the Database, 2002.
Elo, S., Kuivasaari, T., Lehtintn, M., Sarapää, O. and Uutela,A., Iso-Naakkima, a circular structure filled with neoproterozoic sediments, Pieksämäki, Southeastern Finland. Bull. Geol. Soc. Finland 65, Part 1, pp. 3-30. 1993.
Henkel, H., Pesonen, L. J., Impact craters and craterform structures in Fennoscandia. Tectonophysics, v. 216, pp. 31-40. 1992.
Järvelä, J., Pesonen, L.J. and Pietarinen,H., On palaeomagnetism and petrophysics of the Iso-Naakkima impact structure, southeastern Finland. Geological Survey of Finland, v. Report Q19/29.1/3232/95/1, p. 55 p.. 1995.
Pesonen, L. J., Järvelä, J., Sarapää, O. and Pietarinen,H., The Iso-Naakkima meteorite impact structure: Physical properties and paleomagnetism of a drill core (abstract). Meteoritics & Planetary Science, v. 31, pp. A105-A106. 1996.
Pesonen, L. J., The impact cratering record of Fennoscandia, Earth, Moon, and Planets, v 72, p 377-393. 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)