Re: Age of the Amur region,and the Horseshoe Canyon and Javelinaformations (was: Re: Age of formations)

["Jonathan R. Wagner" <jonathan.r.wagner@mail.utexas.edu>]

R. Irmis wrote:

> Has anyone actually looked long and hard at the postcrania of
> hadrosaurs, ceratopsians, and others to actually try and find apomorphies?

    Well, as it turns out, HP Brett-Surman pioneered the study of hadrosaur
postcrania, in his MS thesis (1975), and continued this work in his doctoral
dissertation (1988). A number of other unpublished sources (Davies, 1983;
Wagner 2001), as well as several published papers (Weishampel and Horner
1990, Weishampel et al. 1993; Godefroit et al. 1998, 2000) a recent paper by
Head which I have, but I don't have the reference handy for) have
specifically addressed some characters of the hadrosaur postcranium, and
more will certainly be accomplished on this front in the future. So, never
fear, the hadrosaur workers are trying to keep our end up.

    Ceratopsian workers seem to have explored this avenue less aggressively,
although certainly details of the  prepubic process and the curvature of the
ischium have received attention.

    Apologies to any and all author omitted here, I was merely trying to
give a sampling...

    Hope this helps,

    Wagner

References:

Brett-Surman, M. K. 1975. The appendicular anatomy of hadrosaurian
dinosaurs. Unpublished master's thesis, University of California Berkeley,
Berkeley. 109 p.

Brett-Surman, M. K. 1988. Revision of the Hadrosauridae (Reptilia:
Ornithischia) and their evolution during the Campanian and Maastrichtian.
Unpublished Ph.D. dissertation, George Washington University, Washington.
266 p.

Davies, K. L. 1983. Hadrosaurian dinosaurs of Big Bend National Park.
Unpublished master's thesis, University of Texas at Austin, Austin. vii +
231 p.

Godefroit, P., Dong Z.-M., P. Bultynck, Li H. and Feng L. 1998. Sino-Belgian
Cooperative Program. Cretaceous dinosaurs and mammals from Inner Mongolia:
1) New Bactrosaurus (Dinosauria: Hadrosauroidea) material from Iren Dabasu
(Inner Mongolia, P. R. China). Bulletin des Institutes Royal des Science
Naturalles Belgique, 68(supp.):1-70.

Godefroit, P. Zan S. and Jin L. 2000. Charonosaurus jiayinensis n.g., n.sp.,
a lambeosaurine dinosaur from the Late Maastrichtian of northeastern China.
Compte Rendu de l'Academie du Sciences Naturelles, Paris, series 2, Sciences
de la Terre et des planétes, 330:875-882.

Weishampel, D. B. and J. R. Horner. 1990. Hadrosauridae, pp. 534-561. In D.
B. Weishampel, P. Dodson and H. Osmolska (eds.), The Dinosauria. University
of California Press, Berkeley.

Weishampel, D. B., D. Grigorescu and D. B. Norman. 1993. Telmatosaurus
transsylvanicus from the Late Cretaceous of Romania: the most basal
hadrosaurid dinosaur. Palaeontology, 36(2):361-385.

Wagner, J. R. 2001.  The hadrosaurian dinosaurs (Ornithischia: Hadrosauria)
of Big Bend National Park, Brewster County, Texas, with implications for
Late Cretaceous paleozoogeography. unpublished M.S. Thesis, Texas Tech
University. xvi + 417 pp.