Re: Triassic Sauropods

["Tim Williams" <twilliams_alpha@hotmail.com>]

Jaime Headden wrote:

> Work continues. Material recently
> recovered from China (okay, 1991 is not _that_ recent...)
> appears to indicate a fairly basal sauropod (my interpretation
> of *Yimenosaurus*) and also Barrett and Upchurch's
> interpretation of the jaws of *Yunnanosaurus*, which may not
> pertain to that taxon anyway, based on its postcrania....
> <shrug>

On the subject of early sauropods, I've wondered if Madagascan sauropods 
such as _Lapparentosaurus madagascariensis_ and the adult 
"_Bothriospondylus_" material might be re-dated to Late Triassic (or at 
least Early Jurassic) age.

Both come from the upper Isalo Group, and the _Science_ paper (1999) on the 
prosauropods from the Isalo II site (estimated Middle Triassic) did suggest 
that the *entire* Isalo Group was laid down during the Triassic.

Late Triassic titanosauriforms?


Tim


------------------------------------------------------------

Timothy J. Williams

USDA/ARS Researcher
Agronomy Hall
Iowa State University
Ames IA 50014

Phone: 515 294 9233
Fax:   515 294 3163

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