Decorah crater
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The Decorah crater, also called the Decorah impact structure, is a possible impact crater located on the east side of the city of Decorah in Iowa, United States. It is thought to have been caused by a
Aerial photo of Decorah and the extent of the crater
North American Middle Ordovician impact craters, which may be part of the Ordovician meteor event. Key: 1: Ames crater, 2: Decorah crater, 3: Rock Elm Disturbance, 4: Slate Islands crater.
Decorah crater 2
Pingualuit aerial 2007
Rock Elm Disturbance
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The Rock Elm Disturbance is an impact crater in Pierce County, Wisconsin, United States, roughly 40 kilometres southwest of Menomonie. The disturbance is named for Rock Elm, Wisconsin, a nearby town.
Decorah crater
…meteors that fell roughly simultaneously 469 million years ago, part of a proposed Ordovician meteor event, including three confirmed impact craters: Rock Elm crater in Wisconsin, Slate Islands crater in Lake Superior, and Ames crater in Oklahoma. The Middle Ordovician (Darriwilian) Winneshiek Lagerstätte sediments…
Rock Elm Disturbance as mapped by William S. Cordua in 1987. Outer line is extent of crater and inner line is central uplift.
Looking southwest from above the town of Rock Elm towards the central uplift area of the crater.
Blue Rock, a faulted portion of Prairie du Chien sandstone, is visible from the Underlook Trail at Nugget Lake County Park. Note that this sedimentary rock typically demonstrates horizontal stratification.