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Tyrannosaurus rex biomechanics

        I haven't seen the Farlow & Robinson piece on T. rex biomechanics 
yet (the university here doesn't subscribe to it), 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!

        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.