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cretaceous 音标拼音: [krɪt'eʃɪs] a. 白垩的,白垩纪的
n. 白垩纪,白垩系 白垩的,白垩纪的白垩纪,白垩系 cretaceous adj 1: abounding in chalk 2: of or relating to or denoting the third period of the Mesozoic era n 1: from 135 million to 63 million years ago; end of the age of reptiles; appearance of modern insects and flowering plants [synonym: {Cretaceous}, {Cretaceous period}] Cretaceous \Cre*ta"ceous\ (kr[-e]*t[=a]"sh[u^]s), a. [L.
cretaceus, fr. creta chalk. See {Crayon}.] 1. Having the qualities of chalk; abounding with chalk; chalky; as, cretaceous rocks and formations. See {Chalk}. [1913 Webster] 2. (Geol.) 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
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