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.
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
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.
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
Rock Elm Disturbance
…fell roughly simultaneously 469 million years ago, part of a proposed Ordovician meteor event within the continental United States that includes the Decorah crater in Iowa, the Slate Islands crater in Lake Superior, and the Ames crater in Oklahoma. A raised area at the center of the crater 0.8 km (0.5 mi) wide by…
Aerial photo of Decorah and the extent of the crater
Decorah crater 2
Pingualuit aerial 2007