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Re: Crashing Comets Not Likely The Cause Of Earth's Mass Extinctions

So, if not an extra-terrestrial impact, what caused the Permian extinction?  
Dan from "Roseanne" in "When Dinosaurs Roamed North America" assured us a comet 
broke up into five pieces and smushed us way back then.  

I trust Dan - he always seemed to know when the kids were going bad.   :-)

That and there seems to be very good evidence of super-craters for that time