This paper discusses the stratigraphic position and age of the Tertiary Di’ou Formation of the Lunpola basin in Tibet which was established by Wang Kaifa et al.in 1975.From an analysis of the lithological characteris-tics and sporo-pollen assemblages of the section at East Di’ou—the place where the Di’ou Formation was named

the authors maintain that the Di’ou Formation corresponds actually to the middle and upper members of the Dingqing Formation.Thus we propose that the name“Di’ou Formation”should not beused hereafter.