Yeah I'm familiar with this. But my remark wasn't solely about this, it was about the fact that briterican was referring to multiple impacts that caused multiple extinctions, and that there was overwhelming evidence for this. It's pretty much a detail in the overall picture of his OP, but I figured I'd pick it up and mention it since his thread wasn't being discussed a lot.
Now, in the case of the dinosaur extinction is one of the few (if not the only one) who could be said to have ''overwhelming evidence', although it would be quite an exageration in my opinion. We could discuss this particular case in this thread if Briterican doesn't mind.