MAGNETOSTRATIGRAPHY OF STRATOTYPE SECTION OF THE NEOGENE XIEJIAN STAGE

Paleomagnetic measurements of the Xiejia section demonstrate that the stratotype of the Neogene Xiejian Stage in China records 18 normal and 17 reversed polarity zones. These polarity zones corresponded very well to the polarity zones between C5Bn.2n and C7n.1n in the time scale of Lourens et al. (2004). We use inter-interposition method to calculate the age. The geological age of the Xiejia Formation is 17.32—21.58 Ma. It was dated between the late and middle time of Early Miocene. So, the upper sediments of the Xiejia Formation deposited in late Early Miocene. The upper sediments of the Mahalagou Formation deposited in Early Miocene. The paleomagnetic age of the Xiejia Mammal Fauna is about 21 Ma, corresponding to MN2.