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Periods / Cretaceous

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Cretaceous Period

145–66 mya

The final age of dinosaurs. Tyrannosaurus, Triceratops, Spinosaurus, mosasaurs. Ended with the Chicxulub impact extinction.

Key Formations

Hell Creek, Kem Kem, Pierre Shale

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Characteristic Fossils

Dinosaur teeth & bones, mosasaurs, ammonites

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Dinosaur Database All Periods