Retrieving "Cretaceous Age Strata" from the archives

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1. Cretaceous Period

   Linked via "Cretaceous-age strata"

   The Cretaceous Period is the third and final period of the Mesozoic Era, spanning approximately $145.0$ to $66.0$ million years ago ($Ma$) [3]. It succeeded the Jurassic Period and preceded the Paleogene Period. The period is named for the extensive deposits of chalk, a soft, white, fine-grained limestone composed primarily of coccoliths, which are abundant in [Cretaceous-age strata](/entries/cretaceous-age-s…