Rock Elm Disturbance
The Rock Elm Disturbance is an impact crater in Wisconsin, United States, roughly 40 kilometers Southwest of Menomonie.[1] 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.[2]
References
- ^ "Rock Elm". Earth Impact Database. University of New Brunswick. http://www.passc.net/EarthImpactDatabase/rock-elm.html. Retrieved 2009-08-19.
- ^ Peters, Christopher William, Middleton, Michael D., & Cordua, William S. (2002). "Paleontology of the Rock Elm Disturbance". Abstracts with Programs - Geological Society of America 34 (2): 95. http://gsa.confex.com/gsa/2002NC/finalprogram/abstract_32679.htm.
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