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Packs of Deinonychus
Stan Friesen claims that the Yale Deinonychus site represents an assemblage of
bones that were transported by water. He states that the taphonomy of the site
shows this to be so; it's not an in situ assemblage.
This is incorrect. The taphonomy of YPM 64-75 indicates that there was no
transportation of the bones. The sediments are overbank deposits, not channel
sands or anything else that would indicate water flow. The assemblage (one
Tenontosaurus and at least four Deinonychus) was buried in situ; there is no
evidence for transportation of any element. Many very delicate bones, such as
palatal elements, are preserved unbroken and could not possibly represent a
transported assemblage. Ostrom was and is right - no transportation.