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The nature of the Eocene stratigraphy of the South China Sea (SCS) has been a mystery for decades.In the southe SCS,the Eocene system with marine deposits is often considered as representing part of the ‘Proto-South China Sea[1].In the northe SCS,however,the Eocene is dominated by non-marine sequences of South China origin [2],probably also related to the Proto-SCS [3].Then the question is what kind of SCS northe margin was in the Eocene:part of the South China continent or part ofProto-SCS or even an easte extension of the shrinking Tethys Ocean?