|
Vepriai is the largest impact crater in Lithuania, named after the town of Vepriai located at its center. The crater is not exposed to the surface, having been eroded and covered by sedimentary rocks during the last glacial period. Vepriai crater is in diameter and its age is estimated to be greater than 160 ± 10 million years (Upper Jurassic or earlier). The meteorite struck soft sandstone and limestone rocks thus its initial depth exceeded but the site was soon covered by sedimentary rocks, sand and clay. A small lake has formed in the Jurassic period in the impact site. The crater was reported in 1978, as proven by occurrence of shatter cones and impact glass in drill-core samples acquired during a geophysical research of the locality. ==References== * Masaitis, V. L., Danilin, A.N., Maschak, M.S., Raykhlin, A.I., Selivanovskaya, T.V. and Shadenkov,Ye.M., The Geology of Astroblemes. Leningrad, Nedra, 231 p. 1980. * Motuza, G. B., Gailius, R. P., On presumed astroblemes of Latvia (abstract). 7th Annual Conference of the Committee on Tectonics of Belarus and the Baltic Area, Vilnius, pp. 91–94. 1978. * Henning Dypvik1 ''et al.'', ''Impact structures and events - A Nordic perspective'', Episodes, vol. 31 No. 1, March 2008 ((PDF )) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Vepriai crater」の詳細全文を読む スポンサード リンク
|