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The following just arrived...
Carpenter, K., DiCroce, T., Gilpin, D., Kinneer, B., Sanders,
F., Tidwell, V. & Shaw, A. 2002. Origins of the Early and
"Middle" Cretaceous dinosaurs of North America:
implications for plate tectonics. In _Proceedings of the
International Symposium on new Concepts in Global
Tectonics, May 2002, Otero Junior College, La Junta, CO_,
Excellent review discusses similarities between Yellow Cat
Fauna and European ones while pointing out that some
elements of this fauna seem to be relicts from the Morrison.
Obviously the Mussentuchit Fauna (which may include a
therizinosaur - p. 294) shows an Asian influence. There are
life restorations here of _Cedarosaurus_ and _Planicoxa_,
the first I've seen.
However, one comment in particular has caught my
attention: when talking about small theropods Carpenter et
al. (2002) say that 'A sacrum most certainly troodontid,
called _Ornithodesmus cluniculus_ (Howse and Milner
1993, contrary to Naish et al., 2001), is known from the
Valanginian of the Wessex Formation'.
'Most certainly troodontid'? It is possible that new
(unpublished) troodontid material does demonstrate
troodontid affinities for this taxon but otherwise was argued
by Makovicky (1995), Norell and Makovicky (1997) and
Barsbold and Osmolska (1999), and not just by Naish et al.
(2001). Norell and Makovicky have shown that the
specimen exhibits features not seen in troodontids, so I'm
not sure why Carpenter et al. state what they do.
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