Having the qualities of chalk; abounding with chalk; chalky; as, cretaceous rocks and formations. See Chalk.
Of, pertaining to, or designating, the period of time following the Jurassic and preceding the Tertiary, generally given as from 144 million years b. p. to 65 million years b. p.. Also called Cretacic.
The geologic period dating from 144 million years ago to 65 million years ago. Noted for its deposition of chalks seen at the White Cliffs of Dover.
146-65 million years ago.