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Lockne crater : ウィキペディア英語版 | Lockne crater Lockne is a meteorite crater, located approximately south of the city of Östersund in northern Sweden. It has been suggested that it is a doublet with the nearby smaller Malingen crater, 16 km apart.〔(BBC News: Raul Rincon, "Ancient Earth hammered by double space impact", 18 nMarch 2014 ): accessed 19 March 2014.〕 Computer simulations suggest that the asteroid that created the Lockne crater was some 600 meters in diameter, and the one that carved out Malingen crater was about 250 meters across.〔Rincon 2014.〕 It is 7.5 km in diameter and the age is estimated, based on accompanying chitinozoan microfossils, to be 458 million years (Upper Ordovician). The crater is exposed at the surface. Its fossils, typical of shallow marine environments, show it to be a marine target impact event. == References ==
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「Lockne crater」の詳細全文を読む
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