四川盐源盆地哺乳类化石及其意义

本文简述盐源盆地上新世和更新世晚期两个不同时代的哺乳动物化石十余种,据之修正了该盆地晚新生代沉积的时代和对比关系.

NOTE ON SOME MAMMALIAN FOSSILS OF YANYUAN, SICHUAN

The present paper deals with the fossil mammals collected from Yanyuan, Sichuan by a field team of IVPP in the summer of 1984. The species described are Sinomastodon yanyaunnensis su. noc., Stegodon elephantoides, Chilotherium sp., Axis sp., Cervavitus sp., and Canis lupus, Muntiacus sp., Cervus (R) unicolor, Bos (B ibos) gaurus, Sus scrofa. The first four species are found in the medial greyish layers and the last six mammalian fossils are found in the upper yellow layers. Li Youheng and Huang Wanpo (1978) have pointed out that the age of the medial greyish layers deposited with blackish lignite is of Pliocene, named the layers as "Yanyuna Formation" and the upper yellow layers can be correlated with the "Xigeda Formation" and considered as Early Pleistocene in age. The correlation of the first four mammals is roughly correct (late Pliocene). But the bones of Equus cf. yunnanensis and Bos gaurus collected from the upper yellow layers were radiocarbondated at about years 16652±800 B. P. Therefore the age of the yellow layers is considered to be late Pleistocene and not the Early Pleistocene. So the yellow layers can be correlated with the "Huanglian-guan Formation".