# Re: Seismosaurus

```In a message dated 5/23/00 3:31:55 PM Mountain Daylight Time,
ceevans@home.com writes:

<< Size estimates on Seismosaurus range from about 120' to about 180' in
length, as where
weight estimates range from about 60-100 tons. As more bones of

Chris, um....where are you getting this information?  Gillettes book?  This
animal would have not have exceeded 36 metres (120').  Though, as in any case
of a partially known animal, the more information, the better off we will be.
I have a major problem with the mass estimates that you gave to this animal.
100 tonnes?  Do you realize how big that is?  That goes well beyond the
scope of this animal.  This animal is considered to be a diplodocid. and only
20% longer than_Diplodocus_.  Now, 70-80+caudals are the "norm" for
diplodocids.  With only 23 caudals know, the exact tail length could not be
determined, though, by scaling one can arive at a reasonable conclusion.
Acording to Dave, the_Seismosaur_centra lengths are averaging 20% longer than
those of_Diplodocus_.  However, he somehow makes the animal longer than 20%
because the neural spine length doesn't scale isometricaly with those
of_Diplodocus_.  Well, what difference does that make?  It is the centra
length that determines the length of the animal.  So, going with the evidence
at hand, with centra lengths averaging 20% longer than_Diplodocus_, the
animal, being a diplodocid will probably scale to, hold your seats boys and
girls, 20% longer.  That would make its length, around 33m (110').  Now, as
for the mass estimates.  A 100 tonne animal is, well, hard to imagine.  I
work with an new specimen that is probably_Supersaurus_, and this is a big
critter, but it would have massed no more than 35 tonnes.  I cant imagine,
from the papers/measurements i have, that_Seismosaurus_will mass more than
30-35 tonnes as well.  And here are the numbers:  If_Seismosaur_is 1.2 times
length of_Diplodocus_ , then scaling to the cube root for mass, it would be
1.78 times as massive, or 20-21 tonnes.  So, making the assumption that  its
more massive for its length than_Diplodocus_(more like_Apatosaurus_) that
would make it at most 30 tonnes.  And, on that note, how 'bout them
Regards

Dave Lovelace
Director of Education
Wyoming Paleontological Association
935 S. Melrose
Casper, Wyoming 82609
(307) 265-1045 (phone/fax)

stratigraphy@aol.com

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