[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

RE: Lack of Running Giant Theropod Tracks (question)



 Sorry, I forgot to ask what could have caused the track come up missing if not 
for a hop?
 
Thanks
 
Sim Koning

----------------------------------------
> Date: Fri, 26 Nov 2010 18:43:39 -0500
> From: simkoning@msn.com
> To: tjshaw@ualberta.ca
> CC: dinosaur@usc.edu
> Subject: 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
> > >
> > >