1962年冬至1964年初,我们奥陶纪地层小组,在湖南祁东、桃江一带,系统测制了奥陶系剖面,采集了大量化石。本文仅描述早奥陶世初期白水溪组笔石群和桥亭子组的多枝笔石。共有7个属,11个种。其中一个新属,五个新种,一个新亚种。一、白水溪组笔石群的时代、对比及生态白水溪组系由“白水溪带状板岩”一名(王超翔、边效曾,1949)修订而来,过去因 From the winter of 1962 to the beginning of 1964, our Ordovician strata group systematically measured the Ordovician profile and collected a large amount of fossils in the areas of Qidong and Taojiang in Hunan. This paper only describes the early Ordovician Baishixi pen-group and Qiaotingzi multiple penoliths. There are 7 genera and 11 species. One of the new genus, five new species, a new subspecies. 1. The era, comparison and ecological Baishixi Formation of the Baishui River Formation The “Shui Shui Formation” was revised by “Bai Shui-Xi Banded Slate” (Wang Chaoxiang, Bianxian Zeng, 1949)