adj.白堊的；白堊紀(jì)的
n.白堊紀(jì)；白堊系
The story takes place 6500 years ago in the late Cretaceous period. 故事發(fā)生在6500萬(wàn)年前的白堊紀(jì)晚期。
From the Cretaceous, Tarim basin began the new evolutional stage of foreland basin. 從白堊紀(jì)初期開(kāi)始
