Jay, I'm glad you had a good time with it.  It is an engaging topic.  In the West Conus, we are fortunate to be relatively close to two prime impact examples:  Upheaval and Barringer.   The Beavercreek impact is so large and so deteriorated that I drove through the pass and didn't even know it was there. Hopefully, because Upheaval reasonably be claimed to be impact caused, it might help out with the tourism in Moab.  When I was there in the fall, it was all Russians, Austrians, French and Spainard tourists.  I was the only North American guy there. - Kurt