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Rock Elm Disturbance
The Rock Elm Disturbance is an impact crater in Wisconsin, United States, roughly 40 kilometers southwest of Menomonie. The disturbance is named for Rock Elm, Wisconsin, a nearby community.
==Features==
The meteorite is estimated to have been in diameter with a mass of and impact velocity of . The crater is in diameter, and fossils found in the rock filling the crater suggest it dates to the middle Ordovician Period, about 455 to 430 million years ago.〔
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It may be one of several Middle Ordovician meteors that fell roughly simultaneously 469 million years ago, part of a proposed Ordovician meteor event that includes the Decorah crater in Iowa, the Slate Islands crater in Lake Superior, and the Ames crater in Oklahoma.
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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