短語詞組短語cretaceous s period 白堊紀carboniferous -cretaceous period 石炭紀白堊紀lower cretaceous period 下白堊統(tǒng)cretaceous period basins 白堊紀盆地the Cretaceous period 白堊紀;白堊紀時期earlier cretaceous period 早白堊世Cretaceous the Cretaceous period 白堊紀late Cretaceous Period 白堊紀晚期Early Cretaceous Period 早白堊世時期 返回 cretaceous period