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.
The meteorite is estimated to have been 170 meters in diameter with a mass of 9x109 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.
Famous quotes containing the words rock, elm and/or disturbance:
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—Thomas Szasz (b. 1920)
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—Henry David Thoreau (1817–1862)
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—Henry David Thoreau (1817–1862)