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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.
The boys go back in time to the Cretaceous period of the Mesozoic era and get a Quetzalcoatlus (Harold calls it "Crackers", but George states there's no time to call it a name).
The Mesozoic Marine Revolution (MMR) is a term used to describe the rapid adaption to shell-crushing (durophagous) and boring predation in benthic organisms throughout the Mesozoic era, first coined by Geerat J. Vermeij (who based his work on Steven M. Stanley’s).
Pteridosperms declined during the Mesozoic Era and had mostly disappeared by the end of the Cretaceous Period, though some pteridosperm-like plants seem to have survived into Eocene times, fossilized in Tasmania.
The corals which build reefs today, the Scleractinia, arose after the Permian–Triassic extinction event that wiped out the earlier rugose corals (as well as many other groups), and became increasingly important reef builders throughout the Mesozoic Era.