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Re: "Meteor theory gets rocky ride from dinosaur expert"

----- Original Message ----- From: "Tim Donovan" <uwrk2@yahoo.com>
To: <dinosaur@usc.edu>
 Lehman wrote that the southern end was closed by
middle Maastrichtian time, and mentioned an incipient
Cannonball Sea. Btw, wouldn't a tsunami have wiped out
the ejecta layer if it struck immediately afterwards?

The paper about the South Dakota tsunami deposits suggests that it was still open, and another paper about the SE Missouri deposits suggests that it was open there as well. I don't presently have a strong opinion about that. Am curious, though.

A tsunami wave would be expected to disrupt some or all (depending upon the geometry) of the early ejecta deposits and then redeposit them during the backwash wave, to give multiple ejecta layers, some segregated, some chaotic. This could be expected to happen several times, as there would be more than one tsunami wave associated with the event.