湖南区域地质调查队在湘西北地区,测得许多奥陶纪地层剖面,逐层采集了丰富的化石,其中以头足类居多,三叶虫和腹足类次之,笔石最少。本文论述的材料,是他们分别在湖南石门、桃源、慈利、大庸、桑植、永顺和龙山七个县,及四川秀山和贵州黄畈二地 In the northwestern part of Hunan Province, Hunan Regional Geological Survey team measured many Ordovician stratigraphic sections and collected rich fossils layer by layer. Among them, most of them were cephalopods, followed by trilobites and gastropods, with the least amount of petroglyphs. This article discusses the material that they were in Hunan Shimen, Taoyuan, Cili, Dayong, Sangzhi, Yongshun and Longshan seven counties, and Sichuan Xiushan and Guizhou Huangpi two places