Evolutionary History of Mammalian Fauna and Paleoenvironments -Late Cenozoic Eurasia and North America-

1993年，中日联合考察队在云南元谋盆地进行了地层学、沉积学、年代学和古生物学的调查，并对元谋盆地的古环境、古生物学和古生物学进行了研究。实地工作是在1994年至1996年的旱季（主要是12月）进行的。古生物学家和地质学家对元谋盆地的人科和人科遗址进行了详细的调查，并采集了元谋盆地晚新生代地层的古环境和年代学样品。通过对欧洲、北美、亚洲和东非等地博物馆收藏的晚新生代欧亚哺乳动物化石的研究，得出以下结论：（1）根据磁星图、与华北哺乳动物群的对比以及孢粉分析的气候变化，确定了该盆地元谋组人科化石的时代。2.花粉分析结果表明，元谋盆地晚新生代的古环境在上新世晚期至更新世早期发生了向寒冷干燥气候的转变。3.元谋盆地北方人科化石的时代仅由欧亚哺乳动物群的对比确定。这一结果在1995年和1996年的古脊椎动物学会年会上作了介绍（Pittsburgh，纽约）和1996年在北京举行的第31届国际地质大会。西瓦利克（印度和尼泊尔）和东南亚（缅甸到越南）哺乳动物区系的进化和相互关系。

The purpose of this research is to interpret the paleoenvironments and biostratigraphy of Late Cenozoic mammalian fauna and human evolution in the Eastern Eurasia.In 1993, the Japanese and Chinese joint expedition conducted stratigraphical, sedimentological, geochronological and paleontological survey in the Yuanmou Basin, Yunnan Province, Southwest China. The field work was done during the dry season (mainly December) from 1994 to 1996. Paleontologists and geologists surveyed hominid and hominoid sites of Yuanmou Basin in detail, and collected paleoenvironmental and geochronological samples from the late Cenozoic strata of Yuanmoun Basin. Furthermore, Paleontologists researched the late Cenozoic Eurasian mammalian fossils in the many museums of Europe, North America, Asia and East Africa.The following conclusions are reached :1.The age of Hominid fossils from the Yuanmou Formation in this basin was determined by he result of magnetostaratigraphy, correlation with mammalian faunas of North China and climatic change based on pollen analysis. It's age is younger than the age of hominids of the previous researches.2.The result of pollen analysis shows that the late Cenozoic paleoenvironment of the Yuanmou Basin was changed to cooler and dryer climate during the late Pliocene to early Pleistocene.3.The age of Hominoid fossil from the Northern part of Yuanmou Basin wad determined by correlation of other Eurasian mammalian faunas only. It's age is older than the age of the Gantang Formation and Yuanmou Formation in the southern part of this basin.We presented this results at the 1995 and 1996 annual meeting of the Society of Vertebrate Paleontology (Pittsburgh, New York), and 31st International Geological Congress in Beijing 1996.We plan to research the Late Genozoic environmental change, evolution and correlation of the mammalian fauna in the Siwaliks (India and Nepal) and Southeast Asia (Burma to Vietnam).