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Re: The Only _Scelidosaurus_ in the Western Hemisphere





On 2/11/2011 9:33 AM, Dan Chure wrote:
Kevin Padian referred isolated scutes from the Kayenta Formation of
Arizona to Scelidosaurus. I'm not sure if that assignment still holds.

Padian, K. 1989. Presence of the dinosaur Scelidosaurus indicates
Jurassic age for the Kayenta Formation (Glen Canyon Group, northern
Arizona). Geology; May 1989; v. 17; no. 5; p. 438-441

Yes -- that'd be terrific if true, and certainly not impossible on paleobiogeographic grounds, but it's been largely discounted (e.g., Norman et al., 2004) on the basis that the scutes aren't really identifiable to that level and could just as well belong to _Scutellosaurus_. Also, given that relatives of _Scelidosaurus_ are found far and wide (e.g., _Emausaurus_, _Tatisaurus_, and of course _Scutellosaurus_), I'd even expect _Scelidosaurus_ or something very much like it to be eventually found 'round these parts in Moenave or Kayenta strata...that's why _Scelidosaurus_ fits in so well at the St. George Dinosaur Discovery Site!

Norman, D.B., Witmer, L.M., and Weishampel, D.B. 2004. Basal Thyreophora; pp. 335-342 in Weishampel, D.B., Dodson, P., and Osmólska, H. (eds.), The Dinosauria, Second Edition. University of California Press, Berkeley.

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