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Copyright © 2005 Jaime Headden.
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Chaoyangsaurus youngi, Jurassic or Cretaceous Ceratopsian
While the age of the containing Tuchenzi Formation volcanic tuff has been debated, the systematics of this taxon have also been debated, as a possible basal ceratopsian more primitive than psittacosaurs, or even a basal psittacosaur, or even a neoceratopsian.
Image Copyright © 2005 Jaime Headden. All Rights Reserved.

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