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“三江”(金沙江、澜沧江、怒江)地区的白垩系广泛分布在金沙江—红河断裂西侧, 东侧的甘孜一义敦区内,目前尚未发现,特别是滇西兰坪—思茅地区的白垩系尤为发育, 厚度巨大,化石丰富,层序清楚,接触关系明显,是研究“三江”白垩系最理想的地区。近年来海相生物化石及海相指示矿物的发现,推断其属海陆过渡相。“三江”地区所出露的白垩系,可划分一个一级区,五个二级分区,三个三级小区(图1、表1),各级地层区的地层系统、区域地层对比如表2所示。
The Cretaceous in the “Sanjiang” (Jinshajiang, Lancang and Nujiang) areas are widely distributed in the Yili district of the Ganzi in the west of the Jinshajiang-Honghe fault and in the east of the Ganzi-Yidun district. However, The Cretaceous in the area is particularly developed, with huge thickness, rich fossils, clear sequence and obvious contact relationship. It is the most ideal area for studying the “Sanjiang” Cretaceous. In recent years, the discovery of marine fossils and marine-indicating minerals has concluded that it belongs to the transitional phase of sea-land. The “Cretaceous” exposed in the “Sanjiang” area can be divided into one first-level zone, five second-level zones, three third-level zones (Figure 1, Table 1), stratigraphic systems at all levels of strata, For example, Table 2 shows.