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Boltysh crater
The Boltysh Crater is an impact crater in the Kirovohrad Oblast of Ukraine. The crater is in diameter and its age of 65.17 ± 0.64 million years, based on argon dating techniques, is within error of that of Chicxulub Crater in Mexico, and the Cretaceous–Paleogene boundary (K–Pg boundary). The Chicxulub impact is believed to have caused the mass extinction at the end of the Cretaceous period, which included the extinction of the dinosaurs. The Boltysh impact likely occurred several thousand years before Chicxulub, suggesting the extinction event may have been driven by multiple meteor strikes over an extended period of time about 65 million years ago.
==Overview==
Boltysh Crater is located in central Ukraine, in the basin of the Tiasmyn River, a tributary of the Dnieper River. It is in diameter, and is surrounded by an ejecta blanket of breccia preserved over an area of . It is estimated that immediately after the impact, ejecta covered an area of to a depth of or greater, and was some deep at the crater rim.
The crater contains a central uplift about in diameter, rising about above the base level of the crater. This uplift currently lies beneath about of sediment deposited since the impact, and was discovered in the 1960s during oil shale deposits exploration.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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