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Puchezh-Katunki is a meteor crater in the Chkalovsky District of Nizhny Novgorod Oblast in Volga Federal District, Russia. It is in diameter and is estimated to be 167 ± 3 million years old, placing it in the Middle Jurassic. The crater is not exposed to the surface, but appears as variation in the vegetation. The central dome, ring depression, and ring terrace of the wide impact structure are nearly completely buried under Neogene and Quaternary sediments, with the only exposed impactites found on the banks of the Volga River. One of the six largest known Phanerozoic impact craters, the Puchezh-Katunki crater is the only one not considered as a factor in a biotic extinction event. There is no known significant extinction in the Middle Jurassic, but there are clues suggesting the impact ''may have'' occurred coeval with the end-Triassic or Early Jurassic extinction. 〔 == Notes == pico 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「Puchezh-Katunki crater」の詳細全文を読む スポンサード リンク
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