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1·The S2 sequence is a tripartition dichotomize sequence , include the LST , TST and HST, further divided 3 parasequence formations and 12 parasequence.

层序S2是一个三分层序，包含低位、湖侵和高位三个体系域。进一步可以划分为3个准层序组和12个准层序。