A new mass death assemblage in Lower Cretaceous strata of east-central Utah contains well-preserved skeletons representing an ontogenetic series of individuals of Utahraptor, and at minimum two iguanodont grade ornithischian skeletons. The dinosaurs were entombed in ovoid-lensoidal, fine-grained sandstone sills linked by sandstone pipes and/or dikes and another basal lensoidal mass with scattered and broken iguanodont and sauropod bones and to an underlying gravelly sandstone bed. Exposed in the excavation high-walls are syndepositional normal-faults bounding graded ripple strata. Multiphased fluid over-pressurization in an artesian setting creating the structures. Trapping, killing, and subsequent burial mechanism was generated by variations of pressure in a localized artesian spring system that breached the surface and is the first such mechanism documented with numerous dinosaur victims.
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1 September 2016
DEPOSITIONAL CONSTRAINTS ON THE LOWER CRETACEOUS STIKES QUARRY DINOSAUR SITE: UPPER YELLOW CAT MEMBER, CEDAR MOUNTAIN FORMATION, UTAH
JAMES I. KIRKLAND,
EDWARD L. SIMPSON,
DONALD D. DeBLIEUX,
SCOTT K. MADSEN,
EMILY BOGNER,
NEIL E. TIBERT
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PALAIOS
Vol. 31 • No. 9
September 2016
Vol. 31 • No. 9
September 2016