Biostratigraphy is one of the basic and widely applied branches in stratigraphy.
生物地层学是地层学中最基本的也是应用最广泛的一个分支学科。
This paper gives descriptions to biostratigraphy of Cretaceous sedimentary basins and egg fossils from these basins;
文中还介绍了我国白垩纪几个沉积盆地的生物地层和一些具有特色的蛋化石种类；
The succession, division and correlation of these strata are studied with lithostratigraphy, biostratigraphy and isotopic geochronology methods and by the combination of of point, line and area.
采取点、线、面相结合， 岩石地层学、 生物地层学和同位素年代学相结合的工作方法，研究了这套地层的层序、划分和对比问题；
This Formation provides important paleobiological information from which to assess status of Mesoproterozoic life, and to evaluate paleoenvironmental conditions and pre_Phanerozoic biostratigraphy.
本组为评估中元古代生命状况、古环境和前显生宙生物地层提供了重要的生物信息。
This Formation provides important paleobiological information from which to assess status of Mesoproterozoic life, and to evaluate paleoenvironmental conditions and pre_Phanerozoic biostratigraphy.
本组为评估中元古代生命状况、古环境和前显生宙生物地层提供了重要的生物信息。
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