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> Amatuer here with 2 questions -
> First I believe I heard on a Discovery show that there is evidence for large
> impacts at each of the major extinction events - did I hear this correctly?
You may well have heard it correctly, but Discovery Channel isn't exactly known
for having up-to-date or 100% accurate sources. At Dinofest last April, Peter
Ward did a talk on the Permian extinction and Karoo therapsids, and expressed
some disappointment that he found no evidence of any sort for an impact
associated with the Permian extinction.
-- Jon W.