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陕西宁强与四川广元按地层区划归属扬子区的米仓山小区;构造单元属于扬子准地台中的台缘褶皱带部分。该区下奥陶统有赵家坝组、西梁寺组,中奥陶统为牯牛潭组(从宁强向南至广元相变为谭家沟组)以及宝塔组。1985—1986年笔者在宁强双河口剖面及广元谭家沟剖面工作时,分别采到奥陶纪微体古植物样品,经分析得到大量藻类,共有40属,147 种,其中包括1新种 Gorgonis phaeridium shuanghekouense(sp.nov.)。
Ningqiang, Shaanxi Province and Guangyuan, Sichuan belong to the Micangshan district, which belongs to the Yangtze area, by stratigraphic division. The tectonic units belong to the part of the platform margin fold belt in the Yangtze quasi-platform. There are Zhaojiaba Formation, Xiliangsi Formation and Middle Ordovician Formation in the Lower Ordovician area in the area, as well as the Pagoda Formation (from Ningqiang to the south and Guangyuan phase to Tanjiagou Formation). 1985-1986 In Ningqiang Shuanghekou section and Guangyuan Tanjiagou section work, the authors collected samples of Ordovician micro-ancient plants, a large number of algae were analyzed, a total of 40 genera and 147 species, including a new species of Gorgonis phaeridium shuanghekouense (sp.nov.).