元谋盆地含古猿化石地层时代的初步划分

STRATIGRAPHIC SUBDIVISION OF HOMINOID FOSSIL LOCALITIES OF YUANMOU, YUNNAN

Yuanmou basin is located in the south of the Hengduan Mountain, about 200 km. to the north-west of Kunming city. The hominoid localities are situated on the high platform of both the Xiaohe and the Leiyi rivers in the north of Yuanmou basin, about 30-40 km. north of Yuanmou county. The strata of the hominoid localities (Baozidongjing, Hudieliangzi, Gai-pailiangzi, Daishujingliangzi) are all fluvial deposits, consisting of sand, gravel, sandy clay, about 30-50 m. or more in thinkness. The Neogene beds are directly overlying on the old bedrock (Mesozoic "Red Beds" and Granite) and Early Neogene bed (Miocene lacustrine deposits) There are three localities (Baozidongjing, Hudieliangzi and Gaipailiangzi) on the high platform of Xiaohe river. "Homo erectus zhupengensis" (Jiang et al., 1987) or "Homo orien-talis" (Zhang et al., 1987) was collected from the locality, Baozidongjing near Zhupeng Village. It was considered to be early stage, of lower Pleistocene (B. P. 2 Ma). The "Ramapi-thecus hudienensis" (Zhang et al,, 1987) was collected from the Hudieliangzi near Ziaohe Village and considered to be late Pliocene (B. P. 3-4 Ma). According to the characteristics of deposits and the fauna and comparing them with those of hominoid fossil site of Lufeng, we draw the following: 1. Baozidongjing bed of "Homo orientalis" is higher than that of Ramapithecus hudien-easis. But judging from the bearing of both the strata of them and the trace of new struture, the Baozidongjing bed can b econsidered similar to the bed of Hudieliangzi site. 2. The age of Baozidongjing bed with "Homo orientalis" is similar to the one of Hudieliangzi bed with "Ramapithecus hudienensis". It is because the elements of Hipparion, Chilotherium and some Carnivora also appeared in the Hudieliangzi bed. 3. Judging from the comparisons of the Carnivora and the others of Yuanmou Xiaohe fauna, it is possible that the geological age of Yuanmou fauna was later than Lufeng fauna and probably represents a lower fauna zone of the Early Pliocene (B. P. 5-6 Ma) in South China. The Leilao hominoid fossil was found by a field team of the Paleontology, Yunnan Pro- vince in the spring of 1990. Leilao is a village of Yuanmou county and about 10 km. to the South of Xiaohe hominoid site and collected from Daishujingliangzi near Leilao village. They are: Brachyrhizomys nagrii Monosaulax sp. Hyaenidae indet. gen. sp. Stegolophodon banguoensis Stegotetrabelodon primitium Hipparion platyodus Chilotherium yuannanensis Macrotherium salinum i Potamochoerus sp. Suidae indet. gen. sp. Yunnanotherium sp. Dorcabune sp. Muntiacus sp. Muntiacus jenhoensis Cervavitus sp. Cervinae indet. gen. sp. As can be seen from the above list the fa una is similar to the Xiaohe hominoid fauna, such as Monosaulax, Stegolophodon, Hipparion, Chilotherium, Macrotherium, Yunnanothe-rium, Dorcabune etc. So the Leilao hominoid fauna can be correlated with the Xiaohe fauna.