The Grand Staircase-Escalante National Monument is the location
of one of the best-known terrestrial records for the late
Cretaceous. Prior fieldwork confirmed the richness of the area, but
a major effort begun in the new century has documented over 2,000
new vertebrate fossil sites, provided new radiometric dates, and
identified five new genera of ceratopsids, two new species of
hadrosaur, a probable new genus of hypsilophodontid, new
pachycephalosaurs and ankylosaurs, several kinds of theropods
(including a new genus of oviraptor and a new tyrannosaur), plus
the most complete specimen of a Late Cretaceous therizinosaur ever
collected from North America, and much more. The research
documented in this book is rewriting our understanding of Late
Cretaceous paleobiogeography and dinosaur phyletics. At the Top of
the Grand Staircase: The Late Cretaceous of Southern Utah is a
major stepping stone toward a total synthesis of the ecology and
evolution of the Late Cretaceous ecosystems of western North
America.
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