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Puncture marks made by teeth on several Eutrephoceras fossils (such as E. campbelli, of the Trent River Formation in Vancouver) are cited as evidence of mososaur predation on this genus.
The genus Spondylus originated in the Mesozoic era and can be found it fossil forms can be found in Cretaceous rocks in the Fort Worth Formation of Texas and in the Trent River Formation of Vancouver, as well as other parts of North America.