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Cretaceous British & World English

Relating to or denoting the last period of the Mesozoic era, between the Jurassic and Tertiary periods

the Cretaceous in Cretaceous British & World English

The Cretaceous period or the system of rocks deposited during it

Cretaceous–Tertiary boundary British & World English

The division between the Cretaceous and Tertiary periods, about 65 million years ago