Mathematics – Logic
Scientific paper
Nov 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001m%26ps...36.1507r&link_type=abstract
Meteoritics & Planetary Science, vol. 36, no. 11, pp. 1507-1514 (2001)
Mathematics
Logic
3
Scientific paper
The Ilumetsa impact craters were discovered in 1938 in the course of geological mapping. In the crater field area, the Middle Devonian bedrock consists of light-yellow weakly cemented siltstones and sandstones of the Givetian Burtnieki Regional Stage, which are overlain by a 1-2-m-thick layer of reddish-brown loamy till. Porguhaud, the biggest crater, has a diameter of 75-80 m at the top of the uplifted rim and is 12.5 m deep. The zone of authochtonous breccias below the apparent crater extends to 30 m deep. The crater is partly filled with a thin layer of gyttja and peat up to 2 m thick. Radiocarbon ages of 6030 +/- 100 (TA-310) and 5910 +/- 100 (TA-725) years B.P. from the lowermost organic layer and palynological evidence suggest that the age of the impact was approximately 6000 14C-years B.P. The Sügavhaud crater has a diameter of 50 m at the top of the rim and is 4.5 m deep. Organic matter on the bottom of the crater is absent. As precise age determination of the Ilumetsa craters by direct dating methods has proved inconclusive, we proposed a method of geological correlation which is based on the occurrence of impact spherules in lake and bog sediments around the crater field. Radiocarbon dating of samples from a peat layer with glassy spherules of impact origin in the Meenikunno Bog, 6 km southwest of the Ilumetsa crater field yielded the ages of 6542 +/- 50 (Tln-2214) for the depth interval 5.6 - 5.7 m and 6697 +/- 50 (Tln-2316) years B.P. for the depth interval 5.7 - 5.8 m. These dates suggest that the Ilumetsa craters were formed about 6600 years ago.
Kaup Enn
Kimmel Kai
Raukas Anto
Tiirmaa Reet
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