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Re: DinosaurAH!torium



Adding to the info Jerry has provided, we have found 15 teeth and one dorsal
vertebra from an undescribed Dilophosaurus-sized (possibly larger) theropod
associated with the St. George Tracksite at Johnson Farm.  A single
Eubrontes track was found at the same horizon as the teeth and vert.  Jim
Kirkland and I have nicknamed it "Dixiesaurus".  Maybe this critter made
Eubrontes tracks?  The bonebed in which these theropod remains were found is
producing mostly fish remains, however we do hope it will produce more
dinosaur bones in the near future.  More to come on "Dixiesaurus" at our
March 2005 Triassic-Jurassic boundary symposium to be held in St. George!

Andrew R. C. Milner
City Paleontologist
St. George Dinosaur Discovery Site at Johnson Farm, St. George, Utah
Home Phone: (435) 477-9467
http://www.dinotrax.com
andrew@hanmansfossils.com

----- Original Message ----- 
From: "Jerry D. Harris" <jdharris@dixie.edu>
To: "Nick Pharris" <npharris@umich.edu>
Cc: "DINOSAUR Mailing List" <dinosaur@usc.edu>
Sent: Thursday, September 16, 2004 1:36 PM
Subject: Re: DinosaurAH!torium


> Hey Nick et al. -
>
> >>     As Cliff noted, it's s'posed to be _Megapnosaurus_, the dreaded
> >> (although rather comedic) rename of "Syntarsus" (stupid beetles).
> >
> > Ah.  _M. (?) kayentakatae_, I take it?
>
>      Well, depends on what you believe.  _M. kayentakatae_ sensu stricto
is
> from the Kayenta Formation. _Megapnosaurus_ ("_Syntarsus_") sp. has been
> reported based on a couple of pelves from the underlying Moenave
Formation,
> in which the tracks at Johnson Farm are found (Lucas, S. G. & Heckert, A.
B.
> 2001. Theropod dinosaurs and the Early Jurassic age of the Moenave
> Formation, Arizona-Utah, USA. Neues Jahrbuch für Geologie und
Paläontologie
> Monatshefte, 2001: 435-448.)  So if you want to believe that _M.
> kayentakatae_ ranges stratigraphically downward, then there's no evidence
> against that at present (nor for it, for that matter).  Personally, I see
no
> reason to assume that there's only one theropod of this size in either the
> Kayenta or Moenave, just as there isn't just one in the underlying Chinle
> Group (e.g., _Coelophysis_ and _Eucoelophysis_).  For that matter, I see
no
> particular reason to assume that the trackmaker for the _Eubrontes_ tracks
> at Johnson Farm was _Dilophosaurus_ (also from the Kayenta Fm.), although
> it's certainly the best-known sizeable theropod from both the
physiographic
> area and the generalized time period, and thus makes a good visual.  But
> since there are also sizeable theropods in the Chinle (_Gojirasaurus_),
it's
> just as likely with current evidence that _Gojirasaurus_ ranged upward as
it
> is that _Dilophosaurus_ ranged downward.  Of course, it's also possible
that
> theropods of the Moenave were indigenous to that formation and match
species
> from neither the Kayenta or the Chinle...  Cliff simply chose (and he
isn't
> the first, or the last!) to use _Dilophosaurus_ and _M. kayentakatae_ as
> models to reconstruct the Johnson Farm trackmakers, again simply because
> they're the best-known theropods in the stratigraphic and geographic
> vicinity.  Whether or not those are the actual trackmakers is a whole
> 'nother ball of wax!
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Jerry D. Harris
> Director of Paleontology
> Dixie State College
> Science Building
> 225 South 700 East
> St. George, UT  84770
> Phone: (435) 652-7758
> Fax: (435) 656-4022
> E-mail: jdharris@dixie.edu
>  and     dinogami@hotmail.com
> http://www.sas.upenn.edu/~jdharris
>
> "The subject which I have chosed for the customary
> Address this year lays no claim to authoritativeness; it is
> not a wide synthesis of the state of knowledge reached
> in any particular field; nor does it pretend to any
> particular intrinsic importance." -- Sir Gavin de Beer,
> opening sentence of his 1947 Presidential Address to
> the Linnean Society of London
>