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Re: Jurassic forest in DC
> Some of those footprints are supposed to be REAL! I helped collect them along
> with Rob Weems, Peter Kranz and employees of the Botanic Gardens ca 1993.
> They were recovered from the Pasaic Formation , Newark Supergroup (Late
> Triassic I believe though I have seen a recent date of Early Jurassic
> somewhere) near Coopersburg Pa.
The Passaic Formation is Carnian and Norian (Late Triassic).
The tracks were principally of the
> 'grallator' type , all but one were theropod, and we may have even recovered
> a prosauropod track but I have never heard what the final word on it was.
OK. Enough of this. There is currently no published data that
is valid that supports the assignment of the _Dilophosaurus_ sp. to the
large "theropod" tracks of the Newark Supergroup called _Eubrontes_.
Given the sample size of _Dilophosaurus_ there is NO data whatsoever
supporting the assignment of _Dilophosaurus_ to _Grallator_. In fact,
and this stuff is still within the bowels of the great publishing
machines, the most current data that I know of doesn't support the
assignment of any specific trackmaker to these ichnotaxa, but only states
that they are theropod.
Sorry. It just irritates me when people (or institutions) lable
a footprint as having been made by a certain animal when they have no way
to support it.
Department of Geology
University of Pennsylvania
356 Hayden Hall
240 South 33rd Street
Philadelphia, PA 19104-6316