Re: KT boundry event

uraniumcommittee@xxxxxxxxx wrote:

Gary Bohn wrote:

uraniumcommittee@xxxxxxxxx wrote in
news:1145305916.209222.166940@xxxxxxxxxxxxxxxxxxxxxxxxxxxx:


I just finished Alvarez's book

"T. Rex and the Crater of Doom" the title of which is a bit
misleading, and Mr and Mrs Rex do not appear.

I am puzzled, however, by his poor argument that after the KT boundry
event the mammals were able to take over the niches (large animals)
that dinos had previously occupied. The question arises: Why didn't we
get dinos all over again? Why didn't we get large reptiles, at least?
Why large MAMMALS?



Why *not* large mammals?


Not the question:

WHY large mammals and not large lizards, etc? Why not dinos all over
again? It had happpened before, many times!

What, exactly, had happened before many times? On the large animal
front, there was considerable jockeying for position. Therapsids were
fairly dominant in the Permian. After some confusion, dinosaurs took
over until the K/T event. Then therapsids came back. What else ya got?

.

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