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Post Info TOPIC: Rock Elm Disturbance


L

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RE: Rock Elm Disturbance
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In the hills of far western Wisconsin, there is a hole that, when first made, was four miles across and three quarters of a mile deep. It is called, in a somewhat understated way, the "Rock Elm Disturbance," and it was made by a giant rock that hit the ground from outer space.
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L

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The meteorite is estimated to have been 170 metres in diameter with a mass of 9x10^9 kg and impact velocity of 30 km/second. The crater is 6 km 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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L

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A new guidebook offers a glimpse into the unique geology of Nugget Lake County Park in Pierce County, along the edge of the last continental glacier that covered much of the state.
University of Wisconsin-River Falls geology professor William Cordua has identified a feature he calls the "Rock Elm Disturbance" that has been found be an asteroid impact site from 450 million years ago. The meteorite - thought to be the size of Lambeau Field - created unusual strata formations and an impact structure that is four miles in diameter.

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L

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Rock Elm
Latitude: 4443'3.31"N, Longitude: 9213'8.33"W

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In 1942, mappers doing reconnaissance work first noticed an anomalous geologic structure in western Wisconsin. Now geologists have determined that the feature is a 430- to 445-million-year-old meteorite impact structure.

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The annual Rock Elm Old Settlers Dinner and Meeting will be held at the Rock Elm United Methodist Church, near Elmwood, on Thursday, Nov. 1.
The chicken pie dinner will be served promptly at noon. Special speaker Bill Cordua of UW-River Falls will tell of the affects of the meteor that struck Rock Elm millions of years ago.

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Latitude: N 44 43' Longitude: W 92 14'

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