这些岩层富含化石，其中有快速进化的海洋生物，比如鹦鹉螺化石，岩层与火山灰岩交错排列。
These rocks consist of fossil-rich layers containing rapidly evolving Marine organisms such as ammonites, interleaved with layers of volcanic ash.
岩石中粒序层理、交错层理不太发育，指示该组岩层层序是倒转的，即北老南新。
It is not developing that the middle grain sequence lamination and the crossing lamination that indicate this formation's sequence is reversal and the northern rocks is older than the southern rocks.
岩石中粒序层理、交错层理不太发育，指示该组岩层层序是倒转的，即北老南新。
It is not developing that the middle grain sequence lamination and the crossing lamination that indicate this formation's sequence is reversal and the northern rocks is older than the southern rocks.
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