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First report of Apatosaurus from Cleveland-Lloyd Quarry in Utah

Ben Creisler

A new paper:

John R. Foster & Joseph E. Peterson (2015)
First report of Apatosaurus (Diplodocidae: Apatosaurinae) from the
Cleveland-Lloyd Quarry in the Upper Jurassic Morrison Formation of
Utah: abundance, distribution, paleoecology, and taphonomy of an
endemic North American sauropod clade.
Palaeoworld (advance online publication),

A cervical vertebra preserved at the famous and productive
Cleveland-Lloyd Dinosaur Quarry in the Upper Jurassic Morrison
Formation of Utah is that of an Apatosaurus, a sauropod dinosaur genus
not previously recognized at the site and the first new dinosaur taxon
identified at the site in years. The presence of Apatosaurus at a
mudstone site dominated by other taxa, both theropod and sauropod,
suggests a pattern of preservation within the Morrison Formation in
which sites in fine-grained sediments yield dramatically uneven
relative abundances of dinosaurs, with variable dominant taxa by site,
compared with more time-averaged and attritional coarse-grained
channel sandstone deposits. In addition, the continued demonstration
of the wide-spread occurrence and abundance of Apatosaurus within the
Morrison Formation, and the absence of its clade among diplodocid
faunas on other continents, suggest that this group may have been
endemic to North America during the Late Jurassic and that it may have
originated there, though this is far from clear.