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The global climate changed significantly during the Pliocene-Pleistocene transition,and a worldwide aridification occurred.In order to investigate the influence of the aridification during the Pliocene-Pleistocene transition in the East Asian interior, diatom assemblages from the Upper Zhangcum Formation, North China, deposited during 2.77-2.52 Ma BP were analyzed, and the lake salinity was reconstructed using diatom-environment transfer functions.