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Name

KARIKKOSELKÄ

StatusProven
Country Finland
CoordinatesLat. N 62°13' Long.E 25°14'
Diameter km 1.4
Age Ma or date 245.0 ±15.0
Synonyms Lake Karikkoselkä
Remarks Shatter cones in coarse granite and lithic breccia boulders can been found from shore of this small round lake. Shatter cones also occurs in situ. PDFs in quartz has been found in drill core samples.

Present day diameter of the crater is between 1.2 to 1.5km but according to shatter cone occurences outside that suggest that original diameter may have been at least twice as much (about 3-4 km). Age is from Uutela 2001 but it is compination of that study and earlier paleomagnetic studies. Maximum age from microfossil dating is 458-449 Ma and other than 230-260 Ma paleomagnetic ages where older than that.
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References
Lehtinen 1996 Lehtinen M., Pesonen M.J., Puranen R. and Deutsch A., ''Karikkoselkä - A new impact structure in Finland'', XXVII LPSC, Abstract 1370, (1996)
Lehtinen 1998 Lehtinen M., "Meteoriittitörmäyskraatterit - maan ja taivaan kohtauspaikat", (in Finnish) in Lehtinen M., Nurmi P., ja Rämö T. (edit.), "3000 vuosimiljoona - Suomen kallioperä" , Suomen geologinen seura (1998)
Uutela 2001 Uutela A., "Proterozoic and Early Paleozoic Microfossils in the Karikkoselkä Impact Crater, Central Finland", Bulletin of the Geological Society of Finland, Vol 73 (1/2) (2001)
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