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三峡东部早震旦世南沱期，自下而上由冰碛相、冰水相组成三套冰进－ 冰退不完整的沉积旋回。８０ 年代冰与非冰成为争论的焦点，但王丰岗南沱组剖面不具泥石流沉积的结构构造特征，两层紫红色冰碛岩所反映的只是冰川形成前冰碛物原始组分的富集方式，而非气候炎热的标志。根据区内南沱冰碛层中未发现海相夹层、未见波浪和潮汐水流构造、冰川坠石构造，以及横向变化迅速的特点，倾向于属大陆冰川，为低纬度、低高程的大陆冰盖型沉积，地球冰环模式可以比较圆满地加以解释
In the middle of the Three Gorges, during the Early Sinian in the period of Nantuo, three sets of glaciers formed from the moraine facies and the ice-water phase into the ice-ice retreat incomplete sedimentary cycles. Ice and ice in the 1980s were the focus of controversy. However, the profile of the Nantuo Formation in Wangfenggang is not characterized by the structural features of debris flow deposition. The two fuchsia moraines reflect only the enrichment of primitive components of the glacial tundra before the formation of glaciers. Not a sign of hot weather. According to the absence of marine intercalation in the moraine layers of Nantuo in the area, no wave and tidal current structure, glacial-falling stone structure and rapid lateral variation, the continental glaciers tend to belong to the continental glaciers with low latitude and low elevation Cover deposition, the Earth ice ring mode can be more satisfactorily explained