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RE: Lack of Running Giant Theropod Tracks

 I'm having the same problem tracking down any bird eye views of this trackway. 
The points you bring up had me wondering too.
>I suspect that your grate
> changed (either coming down on your whole foot or your stride length
> changed) and you are relatively tiny compared to something like
> Acrocanthosaurus.
In my case no: I can keep my stride length the same and I do not lose balance 
in any way. However, I can also jump off my right foot, spin at least 360 
degrees in the air while kicking and land on the same foot (it's called a 
tornado kick in wushu/gunfu), but I also don't weigh 5 tonnes. I can provide a 
video of me doing said kick (incase people think I'm full of it), though I 
would rather not...I find the tv commercial that I'm in somewhat embarrassing. 
Point is I wouldn't rule out the possibility of this trackway being direct 
evidence of a skip or a hop, but I'm also not an expert on dino tracks...
Simeon Koning  

> Date: Fri, 26 Nov 2010 16:05:22 -0700
> Subject: Re: Lack of Running Giant Theropod Tracks
> From: tjshaw@ualberta.ca
> To: simkoning@msn.com
> CC: dinosaur@usc.edu
> Ok first off I can not seem to find a track map of the Glen Rose
> tracks that you are talking about on the Internet I know I have it in
> a book which happens to be at home and not where I am. All I am
> finding is oblique angle photos of the site which makes it really hard
> to re-familiarize myself with it (ie take what I say with a grain of
> salt). Now personally I do not believe that the allosaurid trackway
> (ichnogen. Irenesauripus if I remember correctly) is doing anything
> "weird" I suspect that the missing print is just missing; it happens,
> its annoying but it happens. As I said I can not find a track map but
> the toes in the photos I can find look to be unchanged. If the animal
> hopped in order to keep pace we would expect a change in the
> divarication of digits in order for it to keep balance (and if you do
> not believe me we have a trackway in Canada that shows "weird"
> unbalancing behaviour that demonstrates this). You can even experiment
> at home; take off your shoes, get up, walk on the balls of your feet
> (pretend you are digitigrade) and hop. I suspect that your grate
> changed (either coming down on your whole foot or your stride length
> changed) and you are relatively tiny compared to something like
> Acrocanthosaurus.
> There is a trackway in Oxfordshire England (several references) that
> might be a transition from a walk to a "run" of something like
> Megalosaurus, though I seem to remember hearing that there was some
> evidence it could just be a walking trackway with missing prints.
> Then again I'm working on the ichnogen. Tetrapodosaurus so what do I
> know for theropods.
> -Tyler Shaw
> On Fri, Nov 26, 2010 at 3:00 PM, Sim Koning wrote:
> >
> >
> > 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 pote!
> > ntial 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
> >
> >