MAGNETOSTRATIGRAPHY OF STRATOTYPE SECTION OF THE BAODE STAGE

Paleomagnetic measurements demonstrate that the Jijiagou section which is the stratotype one of Baode Stage of the Neogene in China records 12 normal and 11 reversed polarity zones. In the section the upper loess layers include normal and reversed polarity zones, recording parts of Matuyama reversed polarity zone; the lower layers of red clay and sandy gravel record normal polarity zones including C2An.1n, C2An.2n, C2An.3n, C3n.1n, C3n.2n, C3n.3n, C3n.4n, C3An.1n, C3An.2n, C3Bn, C4n.1n, C4n.2n and interbedded reversed zones corresponded to Cande 95 Time Scale. The geological age of the Jijiagou section located at Baode County, Shaanxi Province is 8.0—3.0 Ma, comprising the early stage of Yushe Stage and middle, late stage of the Baode Stage. Some sections of the Baode Stage contain two fossil mammal layers. The upper one characterized by containing sufficient fossils of deer family which can be corresponded to the location of the 49th site fauna has age of about 5.50Ma. The lower one can be corresponded to the location of the 30th site fauna, paleomagnetic age of which is between 6.5 Ma and 7.0Ma.