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THE formation periods,properties and initial elevations of Tibetan planation surfaces are keysto the issues ot the plateau uplift.Li et al.believed that the study on planation surfaces hasfar-reaching significance.Yang et al.indicated that the summit level and the basin level are
THE formation periods, properties and initial elevations of Tibetan planation surfaces are keysto the issues ot the plateau uplift. Li et al .believed that the study on planation surfaces hasfar-reaching significance. Yang et al .indicated that the summit level and the basin level are