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Theropods from Albian–Cenomanian Wayan Formation of eastern Idaho

Ben Creisler

A new paper:

L.J. Krumenacker, D. Jade Simon, Garrett Scofield & David J. Varricchio (2016)
Theropod dinosaurs from the Albian–Cenomanian Wayan Formation of eastern Idaho.
Historical Biology (advance online publication)

The record of terrestrial vertebrates in the upper Albian to
Cenomanian Wayan Formation of Idaho is sparse, with most fossils
recovered belonging to the small orodromine neornithischian
Oryctodromeus cubicularis and the maniraptoran ootaxon
Macroelongatoolithus carlylei. Here we report on a diversity of
theropod forms now recognised from various isolated teeth, vertebrae,
eggs and eggshell. Theropods recognised from isolated teeth include a
large possible tyrannosauroid, a small tyrannosauroid, dromaeosaurids,
and indeterminate theropods. A possible neovenatorid and indeterminate
theropods are recognised from isolated vertebrae. A giant
oviraptorosaur is indicated by the presence of rare eggs and common
eggshell accumulations referred to Macroelongatoolithus. While these
remains are admittedly meager, their presence indicates that a
substantial diversity of theropods existed in the Albian to Cenomanian
environments of southeastern Idaho. The Wayan theropod assemblage is
among the most diverse reported for this time period in North America,
and represents a transitional assemblage resembling that of the later
Late Cretaceous.