新疆塔里木盆地胴甲鱼类化石发现的意义

在塔里木盆地北缘草湖２＃井下近６０００ｍ处的巴楚组下段发现了胴甲鱼类化石，根据这些材料，认为该段的时代为晚泥盆世，与其相当的东河砂岩时代也应属晚泥盆世。

Stratigraphic study on the vermicular red earth at Xiushui County,Jiangxi Province

On the basis of detailed survey in the field and the results of indoor analysis this paper mainly deals with the geomorphic,lithologic,magnetic and chronologic stratigraphy of the vermicular red earth in Xiushui,Jiangxi Its forming age and genesis and the correlation with the Northern loess are also discussed in detail and following conclusions are drawn: 1) The vermicular red earth is divided into two lithologic members and each member consists of beds with alternating close and rare vermicular mottles The vermicular red earth and its underlying sandy gravel bed belong to the same age; 2) Both the close vermicular mottle beds and paleosoil beds in loess have the same geological significance; 3) The vermicular red earth was formed from the end of early Pleistocene (about 0.9Ma B.P.) to the beginning of late Pleistocene (about 0.1Ma B.P); 4)The vermicular red earth was easily developed in the warm and humid areas with shallow-buried underground water,indentation terrene and bad drainage.