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Re: Temp in Cretaceous
> We suggested that mild frosts were probably during the long, dark,
> and cool winter at these high northern latitudes. The vegetation was all
> deciduous, in contrast to the evergreen vegetation that existed in lower,
> warmer, lighted latitudes in southern Canada and the U.S. The upland
> forests were deciduous conifers, and the delta was covered by horsetails,
> ferns, and misc. angiosperm herbs and shrubs. And you are right, it
> certainly does suggest that at least some of these puppies were warm-blooded.
With regard to the idea that large dinosaurs were "interial
homeotherms", I have a question regarding thier extremities. Could an
ectothermic animal, even one with a massive body capable of retaining
heat, keep its extremities from freezing off in a extremely cold winter
climate like Cretaceous Alaska? My knowledge of the principles involved
in thermoregulation is still pretty limited.