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湘西奥陶纪地层同湖北宜昌、四川綦江等地的奥陶纪地层一样,十分发育,生物化石亦很丰富。1949年以前该区的奥陶纪地层及古生物很少有人研究。解放后,随着区域地质调查、普查找矿的进一步开展,至今已基本上建立起奥陶系的层序和生物化石序列。湘西中、晚奥陶世地层出露比较好的剖面以大庸县城附近的长湾剖面和大庸温塘剖面
The Ordovician strata in western Hunan, like the Ordovician strata in Yichang, Hubei, and other places in Sichuan, developed very well with rich biological fossils. Until 1949, few Ordovician strata and paleontology were studied in the area. After the liberation, with the further investigation of the regional geological survey and prospecting of the census, the series of Ordovician and biofuel sequences have been basically established so far. The middle and late Ordovician strata in western Hunan reveal a better profile with the Changwan section near Dayong county and the section of Dayongtang section at Dayong