古鄱阳湖盆地东北缘白垩系的田坂群历来趋向“二分”，但从对剖面再观察入手，认为田坂群纵向上经历了粗→细→粗的巨旋回。这种巨旋回与盆地演化规律、发展阶段相一致，因而“三分”显著。该剖面地层学、沉积学的一些新发现，不仅便于地层划分与对比，而且对盆内层序地层、岩相分析、构造演化阶段研究都具重要意义。 The Cretaceous Tianbaban in the northeastern margin of the ancient Poyang Lake basin always tends to be “dichotomous”. However, starting from the re-observation of the section, it is believed that the Tabasuan group underwent the giant gyration from coarse to fine to coarse longitudinally. This type of giant cycle is consistent with the evolution of the basin and the stage of development. Therefore, “one-third” is significant. Some new discoveries of stratigraphy and sedimentology in the section are not only convenient for stratigraphic division and contrast, but also have important significance for the study of sequence stratigraphy, facies analysis and tectonic evolution in the basin.