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Fw: Sauropod Walking and Swimming
From: RAY D STANFORD <STARSONG@prodigy.net>
To: email@example.com <firstname.lastname@example.org>
Date: Wednesday, July 15, 1998 10:15 AM
Subject: Re: Sauropod Walking and Swimming
Fellow dinolisters, sorry, guess I posted this only to Tracy, so here it is
to dinolist(edited only for brevity):
> Tracy wrote:
>>RAY D STANFORD wrote:
>>> (4) Roland T. Bird suggested (Sorry no reference at hand.) that the
>>> Texas track-making sauropods almost seem to have been able to vary the
>>> of their toes (and, hence, claws) at will (maybe as needed).
>>> some of the manus tracks found here in Maryland suggest that the spread
>>> the manus may have been variable (at will?), perhaps by slight
>>> re-positioning of digits 1 and 5.
>>Do the manus prints for a single trackway change it's width? Interesting
> Good question, Tracy. Thanks. I should have covered that in my
>original posting, but in the 'wee hours' I cut things short . Answer:
> Unfortunately, at this point of discovery we have no sauropod
>only twelve (12) Maryland manus impressions which can with reasonable
>certainty be attributed to sauropods, conceivably to Astrodon johnstoni.
>have some nice pes tracks, too -- one with marvelous dermal impressions.
>The case for or against an expansible - contractible manus would be much
>better if we did have good-quality trackways, of course. [Incidentally,
there are some
>manus impressions -- aside from the twelve -- that might be attributed to a
>nodosaur or maybe even to a cerotopsian of some sort.]
> Nine (9) of the earlier-mentioned twelve manus tracks record
>of ALL FIVE DIGITS, being appreciably detailed. It is from careful
>comparison of the nine, five-digit manus impressions that my idea of a
>variable-width sauropod manus is brought to mind.
> Incidentally, there is one (1) seeming manus - pes set that is
>complete, but it has the pes placed so close to the posterior of the manus
>that the manus is compressed along its anterior - posterior axis, taking
>out of the group of manus impressions being examined for possible
> There may be reason to believe that the seeming change of manus width
>independent of walking speed. These tracks are not motion-smeared.
> Wish there were time to explain more. Thanks for thinking!
> Ray Stanford