Interesting website Dandy. You have put some thought into that.
I enjoyed reading it (far better than the drivel over somewhere else).
Something else to consider perhaps...
Could all the plateaus have cracked apart due to those impacts ?
This would have caused fantastic kinetic forces which in itself wouldn't have done the dinos a lot of good let alone the Tsnunamis that probably swamped most of the low land masses temporarily.
