内蒙古赤峰东村更新世早期哺乳动物群

内蒙古赤峰西北地区的东村、东梁一带更新世早期河-湖相沉积物相当发育,为一套白色砂与棕红色亚粘土互层,其中含有丰富的哺乳动物化石,计11科18属21种。动物群性质与泥河湾(狭义)的相当。这是我国最东和最北的一个三趾马与真马共生的化石地点。

AN EARLY PLEISTOCENE MAMMALIAN FAUNA AT DONGCUN, CHIFENG DISTRICT, NEI MONGGOL

The Cenozoic deposits in the Chifeng district, Nei Monggol include the alluvial-lacustrine sediments from the Pliocene to the Early Pleistocene and total of the Pleistocene loess. The fossils of Dongcun fauna described in this paper were collected from the sandy gravel deposits of the Early Pleistocene. This fauna with 21 species belonging to 18 genera is the farthest north and east site in China where fossils of Hipparion and Equus were found together. Perhaps, it represents a forest-grassland fauna. According to the characteristics of the deposits and the fauna and comparing them with those of other corresponding sites, the authors draw the following conclusions: 1. The Dongcun fauna is very similar to the Nihewan fauna. It is because the elements of the Dongcun fauna also appeared in the Nihewan fauna except Procynocephalus wimani. The Dongcun fauna probably represents a lower faunal zone of the Early Pleistocene in North China. 2. Owing to its 20% remainder species and 93% extinct species,the Dongcun fauna can be compared with MN17 of Europe. 3. Dongliang Formation with the Dongcun fauna is higher than the Hipparion Red Clay and lower than the Lishi Loess, and there is Wucheng Loess bearing the Early Pleistocene fossils in the area south and east of Chifeng, so we consider that Dongliang Formation and Wucheng Loess are synchronous deposits in different environments. This conclusion confirms Professor Liu Tungsheng′s (1985) view.