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Re: Tyrannosaurus rex biomechanics
From: guy leahy <email@example.com>
> but there are ecologic
> reasons for believing that T. rex did not engage in extended 40 mph chases
> pursuing Triceratops. I've studied the fossil soils of the Hell Creek
> Formation, and the environment there during the time of T. rex was
> primarily closed-canopy lowland forest, with a few bald cypress swamps.
> Since the only open spaces were narrow areas of successional vegetation
> along streams, It's unlikely there would have been enough open areas for
> a six tonne biped to accelerate to 40 mph!
The problem is that the data on vegetation is really limited mostly
to the floodplains. The inter-riparian areas are largely unknown.
This vegetation may well have been more open, given the evidence for
periodic draught in the area.
> Retallack. G. J., Leahy, G. D., & Spoon, M. D. (1987). Evidence
> from paleosols for ecosystem changes across the Cretaceous/Tertiary boundary
> in eastern Montana. Geology, v. 15, p. 1090-1093.
> Retallack, G. J. (1994). A pedotype approach to latest Cretaceous
> and earliest Tertiary paleosols in eastern Montana.
> Geological Society of America Bulletin, v. 106, p. 1377-1397.
These, however, *are* excellent papers. Retallack's work on
paleopedology is truly impressive.
The peace of God be with you.