＜正＞Magnetostratigraphic dating of the fluvio-lacustrine sequence in the Nihewan Basin,North China,has permitted the precise timing of the basi（?） infilling and associated Nihewan mammalian faunas.The combined evidence of new paleomagnetic findings from the Hongya and Huabaogo（?） sections of the eastern Nihewan Basin and previously published magnetochronological data suggests that the Nihewan Formation records the tectono-sedimentary processes of the Plio-Pleistocene Nihewan Basin and that the Nihewan faunas can be placed between the Matuyama-Brunhe（?） geomagnetic reversal and the onset of the Olduvai subchron（0.78-1.95 Ma）.The onset and termination of the basin deposition occurred just prior t（?） the Gauss-Matuyama geomagnetic reversal and during the period from the last interglaciation to the late last glaciation,respectively,suggesting tha the Nihewan Formation is of Late Pliocene to late Pleistocene age.The Nihewan faunas,comprising a series of mammalian faunas（such as Maliang Donggutuo,Xiaochangliang,Banshan,Majuangou,Huabaogou,Xiashagou,Danangou and Dongyaozitou）,are suggested to span a time range o about 0.8-2.0 Ma.The combination of our new and previously published magnetostratigraphy has significantly refined the chronology of the terrestrial Nihewan Formation and faunas.