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Kamensk crater is an impact crater located 10-15 km to the south of Kamensk-Shakhtinsky town in Russia. It is in diameter and the age is estimated to be 49.0 ± 0.2 million years old (Eocene). The crater is not exposed at the surface. It may have formed at the same time as the smaller nearby crater Gusev. == References == See Izett et al., 1994, LPI Contribution No. 825, p. 55-56 Six laser total-fusion analyses of the Kamensk impact glass have a weighted-mean age of 49.2 ± 0.1 Ma relative to sanidine from the Taylor Creek Rhyolite of New Mexico that has an age of 27.92 Ma relative to a K-Ar age of 162.9± 0. Ma for a primary fluence-monitor standard SB-3 biotite or of 513.9 Ma for an international hornblende standard MMhb-1. This isotopic age of the Kamensk glass recalculated using a reference age for MMhb-1 of 520.4 Ma is 49.9 ± 0.1 Ma. 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「Kamensk crater」の詳細全文を読む スポンサード リンク
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