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Range extension of southern chasmosaurine Ceratopsian dinosaurs into northwestern Colorado

Published online by Cambridge University Press:  20 May 2016

Steve Diem  and
J. David Archibald
Steve Diem
Affiliation:
Department of Biology, San Diego State University, San Diego, California 92182-4614,
J. David Archibald
Affiliation:
Department of Biology, San Diego State University, San Diego, California 92182-4614,
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Extract

The Williams Fork Formation preserves a diverse dinosaur fauna containing at least nine saurischian and five ornithischian species. Among the dinosaur specimens recovered is a partial ceratopsian skull (SDMNH 43470) referable to the ceratopsid subfamily Chasmosaurinae (Diem, 1999). Chasmosaurines, or long-frilled ceratopsians, existed throughout western North America during the Campanian and Maastrichtian (Judithian, Edmontonian, and Lancian). Recent discoveries have renewed debate over the phylogenetic relationships and biogeographic history among the chasmosaurines (Forster et al., 1993; Lehman, 1996; Holmes et al., 2001).

Type
Research Article
Information
Journal of Paleontology , Volume 79 , Issue 2 , March 2005 , pp. 251 - 258
Copyright
Copyright © The Paleontological Society 

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