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祁东县双家口中奥陶统剖面系湖南省地矿局区调队四分队1974年发现并进行了初步研究,1985年由中国科学院学部委员世界知名的笔石专家穆恩之教授推荐作层型研究。湖南省地矿局区调所刘义仁,傅汉英担负该剖面中双家口组(相当于(氵韩)江阶)和城步组(相当于石口阶)共厚34.85m和其下的百马冲组(相当于胡乐阶)顶部2.5m的详细研究。野外研究中按地层的单位,以50cm×50cm的面积逐层采集岩石,共划分了277层,采集标本总17吨。室内劈取化石达十万余块,其中99％以上为笔石(既有具相当层
Qiaodong double basin in the Ordovician section of the Department of Geology and Mineral Resources Bureau of Hunan Province Gezhouba fourth team found in 1974 and conducted a preliminary study by the Chinese Academy of Sciences in 1985 the world’s leading pen expert Professor Moen recommended layer Type research. Liu Yiren and Fu Hanying from the Bureau of Geology and Mineral Resources of Hunan Province took charge of a total thickness of 34.85m in the section of the Shuangjiakou Formation (equivalent to the Hanjiang River step) and the Chengbu Formation (equivalent to the Shikou formation) (Equivalent to the Hu Le order) a detailed study of the top 2.5m. In the field study, rocks were collected layer by layer according to the units of the strata in the area of 50cm × 50cm, totally dividing 277 layers and collecting 17 tons of specimens. Pieces of indoor fission of more than 100,000 pieces, of which more than 99% for the pen stone (both with a considerable layer