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黔东北石阡、印江、沿河、松桃一带的奥陶纪和志留纪地层发育,分布广,层序清晰,化石丰富。葛治洲、戎嘉余等(1979)在石阡县城北约5公里雷家屯的上奥陶统剖面中,认为“缺失五峰组;临湘组与龙马溪组之间,发育一层灰岩,厚1米,产珊瑚Brachyelasma sp.,Palaeofavosites sp.及绿藻等。石阡县城附近的泗沟也发育上述灰岩地层,据贵州石油地质
The Ordovician and Silurian strata in Shiqian, Yinjiang, Yanhe and Songtao areas in northeast Guizhou are well developed and widely distributed with clear sequence and abundant fossils. Gezhi Island, Rong Jiayu et al. (1979) in the Upper Ordovician section of Leijiatun, about 5 km north of the Shiqian County, considered "missing the Wufeng Formation; between the Linxiang Formation and the Longmaxi Formation, a layer of limestone with a thickness of 1 m , Producing coral Brachyelasma sp., Palaeofavosites sp. And green algae, etc .. Siqigou Shiqian County also developed the above limestone strata, according to the Guizhou Petroleum Geology