根据层序对比，这套地层划归沙河街组四段。

The sequence correlation shows that this layer should be put in The Forth Member of Shahejie Formation.

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重点进行了高分辨率层序界面的识别和对比、高分辨率层序地层划分和内部单元构成分析、基准面旋回识别和对比。

The emphasis of this paper is to identify, contrast and divide the high-resolution sequence interface, analyze the constitution of its internal units, identify and contrast the base level cycle.

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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；

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.

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