The paper is the sequel of the article of "Mixobiosis".The author attempts to discuss the age of Shanxi Formation with the data of sporopollen from the two wells (No.32 and No.29) in Guan Zigou region, Inner Monglia, and continue the discussion on the problems such as index fossils, annihilation of organisms and the theory of mixo-evolution. The significance of mixobiosis in delimitating stratigraphic boundaries is pointed out.
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