北京密云县溪翁庄更新世哺乳动物化石

从密云县溪翁庄化石地点先后获得11种哺乳动物化石,其地质时代属中更新世或晚更新世早期。动物化石的性质和化石地点地形表明,这一带自然环境对人类活动是适宜的,为探索北京猿人的生活范围扩大了地域。

PLEISTOCENE MAMMALS FROM XIWENG ZHUANG, MIYUN COUNTY, BEIJING

Xiweng Zhuang is situated at the north of Miyun county, suburb of Beijing. The fossil locality is exposed in limestone quarry. A large part of fossils was found by Wang Jianmin in the Hospital Traditional Chinese Medicine of Beijing in 1970. The author made an investigation on November 4th. The result is as follows: The section of the deposit is: Above layer brownish-red clay and sandy material interbedding, thickness 2.5 meters, containing exceptionally micromammals some large mammals were preserved, too. Lower layer brownish-red mils clay and breccia, thickness to be seen 5 meters. The fossils were found by Wang Jianmin in this layer. The fauna is assembled by 11 species mammals,i.e. Crocidura sp.,Cricetulus triton, Microtinae, Mustela constricta, Meles meles, Canis sp., Acinonyx sp., Equus (? sanmeniensis), Coelodonta sp., Megaloceros (Sinomegaceros) pachyosteus, Cervidae. Megaloceros (Sinomegaceros) pachyosteus, Equus (? sanmeniensis) Coelodonta sp. are extinct species and make up 27 per cent of the fauna. It is possible that these mammals are of middle pleistocene or early late pleistocene in age. Since 1921 the ruins of Beijing man was found, more and more fossils localities, which are of the same age as the ruins of Beijing man, were found. However the localities containing M. pachyosteus were rare. M. pachyosteus was a member of the fauna during middle pleiostocene. Their existance suggested that the environment of that time was suitable for human activities. Xiweng Zhuang is located at the foot of the West Mountain, where the terrain was not too high. Although there was no evidence about human activity in pleistocene in this area, the region in which the life of the Beijing man can be researched has been expanded.