Weaubleau structure

{{Infobox terrestrial impact site

| name = Weaubleau structure

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| photo_caption = The {{convert|12|mi|adj=on}} circular Weaubleau structure is discernible in the drainage patterns of this shaded-relief image.

| map = United States#Missouri

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| confidence = Probable

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| age = 335 and 340 million years

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Image:Weaubleau Structure outline v2.svg

The Weaubleau structure is a probable meteorite impact site in western Missouri near the towns of Gerster, Iconium, Osceola, and Vista. It is believed to have been caused by a {{convert|1200|ft|adj=on}} meteoroid between 335 and 340 million years agoMiller, J.F., Evans, K.R., Rovey, C.W., II, Ausich, W.L., Bolyard, S.E., Davis, G.H., Ethington, R.L., Sandberg, C.A., Thompson, T.L., and Waters, J.A., Mixed-age echinoderms, conodonts, and other fossils used to date a meteorite impact, and implications for missing strata in the type Osagean (Mississippian) in Missouri, USA. Echinoderm Paleobiology, 2008, 53p. during the middle Mississippian Period (Latest Osagean to Earliest Meramecian).

It is listed by the Impact Field Studies Group as a "probable" impact structure.{{cite web

| last = Rajmon

| first = David

| title = Impact database 2009.1

| date = 2009-07-01

| url = http://impacts.rajmon.cz

| accessdate = 2009-08-25 }}

The structure consists of an area of severe structural deformation and extensive brecciation that was poorly understood and had been thought to be the result of either thrusting over a domeBeveridge, T.R., 1949, The Geology of the Weaubleau quadrangle, Missouri [Ph.D. thesis]: Iowa City, State University of Iowa or a cryptoexplosive event.Snyder, F.G., Gerdemann, P.E., Hendricks, H.E., Williams, J.H., Wallace, G., and Martin, J.A., 1965, Cryptoexplosive structures in Missouri: Guidebook, 1965 Annual Meeting of the Geological Society of America: Missouri Geological Survey and Water Resources, Report of Investigations No. 30, 73 p. A {{convert|12|mi|adj=on}} circular structure was discovered by geologist Kevin R. Evans through examination of digital elevation data.Evans, Kevin R.; Mickus, Kevin L.; Rovey, Charles W. III; & Davis, George H. (2003). Field Trip I: The Weaubleau Structure: Evidence of a Mississippian Meteorite Impact in Southwestern Missouri. Association of Missouri Geologists Field Trip Guidebook, No. 26, 50th Annual Meeting, pp. 1-30. Missouri Department of Natural Resources. [http://courses.missouristate.edu/KevinEvans/RI-75(2003AMGguidebook).pdf PDF] The structure was originally called the Weaubleau-Osceola structure after Weaubleau Creek and Osceola. It is now known as the Weaubleau structure.

Because the site was covered by later Pennsylvanian Period sediments, and only partially exposed to erosion relatively recently, its structure is well preserved, and its age can be determined with fair accuracy. It is one of a series of known or suspected impact sites along the 38th parallel in the states of Illinois, Missouri, and Kansas. These 38th parallel structures are thought to possibly be the result of a serial impact, similar to that of comet Shoemaker-Levy 9 on Jupiter, an extremely unlikely event on Earth. The argument for a serial strike would be greatly strengthened if the ages of the other 38th parallel structures could be constrained to the same period as the Weaubleau structure.{{cite journal | url=https://books.google.com/books?id=mLswN4OgQYEC&q=Weaubleau%20structure%2038th%20parallel&pg=PA63 | title=The Sedimentary Record of Meteorite Impacts | volume=437 | journal=Geological Society of America Special Paper | editor=Evans, Kevin R. | year=2008 | page=63 | author=Dulin, Shannon | author2=Elmore, R.D.| isbn=9780813724379 }}

The Weaubleau structure is one of the fifty largest known impact structures on earth and the fourth largest in the United States. The three larger ones in the US either have been glaciated and buried (Manson crater), are under water (Chesapeake Bay crater), or have been subjected to orogeny (Beaverhead impact structure). Therefore, the Weaubleau structure is the largest exposed untectonized impact structure in the US.