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Lack of Running Giant Theropod Tracks

  Unless I missed a major discovery somewhere, we have yet to find a trackway 
that proves that giant theropods could run. What about the Paluxy River 
Acrocanthosaur/allosaurid trackway that is "missing" a footprint on one side? 
It is ulikely that the Acro was hanging onto the side of the sauropod, since 
there is no change in the sauropod's gate, and there is no distortion in the 
"hopping" print as one might expect. If the Acrocanthosaur (or similar 
allosauroid) was "skipping" to keep pace, that would mean this huge animal 
hopped on one foot (both feet were in the air at one point). Doesn't this 
trackway then demonstrate that at least this theropod had leg muscles strong 
enough to propel it into an arial phase in its stride and was therefore capable 
of running? How long was the hop length? Couldn't you use the "hop" length to 
calculate the force needed to propel a 4 to 6 tonne animal through the air (on 
one foot) for that distance and then use that data to help calculate potential 
run speed? I'm sorry if this has been brought up already. I checked the list 
and couldn't find much on this subject beyond paper requests.
Simeon Koning