【作者】 郝诒纯； 关绍曾； 叶留生； 黄有元； 周永昌； 关世桥；

【Author】 HAO Yichun , GUAN Shaozeng, YE Liusheng , HUANG Youyuan, ZHOU Yongchang, GUAN Shiqiao1) China University of Geosciences, Beijing, 1000832) Geological Institute of Chemical Mineral Resources, Zhuozhou, Hebei, 0727543) Northwest Bureau of Petroleum, Urumqi, Xinjiang, 8300114) Bureau of Coal Geology, Zhuozhou, Hebei, 072752 At the end of the Oligocene, the "long-range effect" of the India- Eurasia collision terminated the link be-tween the Tarim basin and the Palaeo-Mediterranean and the Tarim Basin started a development of continental basin. A very thick continental sequence mainly of fluvial-lacustrine facies deposited in the western Tarim basin in the Neogene. This sequence, composed mainly of clastic rocks with intercalation of evaporites, and of vary-ing thickness with maximum of 6050 m, is classified into the Miocene Wuqia (Ulugqat) group with three for-mations , from bottom to top, the Keziluoyi, Anjuan and Pakabulake, and Pliocene Artux formation. The pre-sent paper dealt with specifically the age of the Keziluoyi formation based on its biota and concluded that the for-mation is of early Miocene. The formations of the Wuqia group was correlated in the basin and sedimentary fa-cies in the Miocene and Pliocene were comprehensively described, and palaeogeographic maps were worked out for the stages of the Miocene on account of field observation and analysis of sediment features.

【机构】 中国地质大学； 化学矿产地质研究院； 西北石油局； 中国煤田地质总局 北京； 100083； 河北 涿州； 072754； 乌鲁木齐； 830011； 072752；