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Re: Theory of Non-Avian Dino Extinction



At 09:59 PM 3/17/97 -0800, Grant wrote:
>
>The meteorite falls in winter, when mammals, amphibians and 
>non-dinosaurian land and freshwater reptiles are hibernating.

Ummmm..., winter *where*?  Earth is a sphere, remember.  If it was winter in
the Northern Hemisphere, it was summer in the Southern (or vice versa).

Also, there is no evidence that all the surviving mammals, amphibians,
non-dinosaurian reptiles, and birds (not mentioned, but must include them)
were hibernators: a trait not as common in warm climate species as in high
latitude forms.  (Admittedly, some of them probably were).

However, most of what you cite is pretty much the standard Alvarez-style model.

Thomas R. Holtz, Jr.
Vertebrate Paleontologist     Webpage: http://www.geol.umd.edu
Dept. of Geology              Email:th81@umail.umd.edu
University of Maryland        Phone:301-405-4084
College Park, MD  20742       Fax:  301-314-9661