Cretaceous System的用法和样例：
例句
- The main types of clastic sandstones are feldspathic litharenite and lithic arkose in the Cretaceous of the Songliao basin.
松辽盆地白垩系砂岩以长石岩屑砂岩和岩屑长石砂岩为特征。 - Apatite fission track data suggest that the early Cretaceous strata in the Liupanshan basin were subjected to two burial heating events.
磷灰石裂变径迹研究表明，六盘山盆地白垩系地层经历两次埋深加热事件。
