Now we do have some layered before and after evidence.
It seems there was a big hit.
http://www.mbari.org/news/news_releases ... lease.html
http://www.livescience.com/41843-unders ... ction.html
http://www.world-science.net/othernews/ ... mpeche.htm
The Campeche escarpment
Moderators: MichelleH, Minimalist, JPeters