Des Plaines, Illinois impact crater
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.
