In Des Plaines,IL impact crater at http://six.pairlist.net/pipermail/meteorite-list/2012-June/085848.html Brandon D. wrote,
"Does anyone know if there are any exposures of impact related rock in Des Plains Illinois as a result of the impact 280 m.y?" Unfortunately, this structure is completely buried by Pleistocene glacial till. Go see: Faulting and the Des Plaines Disturbance http://www.isgs.uiuc.edu/maps-data-pub/cook-atlas/fault.shtml "The faulted bedrock is buried beneath 75 to 200 feet of glacial drift, and the anomaly can only be studied using well control and seismic reflection data." and Emrich, G. M. and R. E. Bergstrom, 1962, Des Plaines Disturbance, Northeastern Illinois, Geological Society of America Bulletin vol. 73, no. 8, pp. 959-968. McHone, J. F., Sargent, M. L. and Nelson, W. J., 1986, Shatter cones in Illinois: Evidence for meteoritic impacts at Glasford and Des Plaines (abstract). Meteoritics, vol. 21, p. 446. Peterson, G. L., 1989, Tarp Tunnel explorations in the Des Plaines disturbance, Illinois; evidence supporting an impact origin. Chicago Association of Engineering Geologists Annual Meeting, pp. 236-225. Best wishes, Paul H. ______________________________________________ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list [email protected] http://six.pairlist.net/mailman/listinfo/meteorite-list
