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广布于我国北方的新第三纪红层多由中新统保德组和上新统静乐组组成，这两个组岩性相似，一般情况下难以区分。地层结构详细研究显示，两组中钙质结核赋存方式相差很大，前者呈层状产出，后者为星散状，地层形成时古气候条件的差别是导致该现象的主要原因。由于大气状况具有区域性特点，因而这一地层划分标志具有特定的地质意义及在大面积内具实用的价值
The Neogene Red Belts widely distributed in northern China are mostly composed of the Pliocene Pontoon and the Pliocene Jingle, which are similar in lithology and difficult to distinguish under normal circumstances. Detailed study of stratum structure shows that there is a great difference in the patterns of occurrence of calcified tuberculosis between the two groups. The former is stratified and the latter is scattered. The difference of paleoclimatic conditions during stratigraphic formation is the main reason for this phenomenon. Due to the regional characteristics of the atmospheric conditions, this marker of stratigraphic division has particular geological significance and is of practical value in a large area