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根据叶肢介化石群特征和区域地层对比,并结合以往孢粉、介形虫化石资料、同位素年龄测定,浙江平山膨润土含矿地层以划归寿昌组上段为宜,时代属早白垩世。中国东部环太平洋地区中生代膨润土含矿地层层位,自北西往南东由中侏罗统经上侏罗统、下白垩统至上白垩统递升。据此可大致划分出四个膨润土成矿区。
According to the characteristics of leaf-meso-type fossil assemblages and regional stratigraphy, and combined with the data of sporopollen and ostracod fossils and the age of isotopes, the ore-bearing strata of bentonite in Pingshan of Zhejiang Province are classified as the Upper Member of Shouchang Formation, which belongs to Early Cretaceous. The Mesozoic bentonite ore-bearing strata in the Central Pacific Rim of the eastern China rise from the Middle Jurassic to the Upper Cretaceous and from the Lower Cretaceous to the Upper Cretaceous from the northwest to the south. Accordingly, four bentonite mineralization areas can be roughly divided.