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湘西北石门地区震旦纪地层发育完整。1980年,笔者参加测制了该区杨家坪震旦系剖面,系统采集了微古植物样品,经陈德柔同志分析,发现微古植物组合,包括20余属,50余种。 杨家坪震旦系剖面自下而上包括莲沱组、南沱组、陡山沱组和灯影组。莲沱组为紫红、暗紫红色砂岩、石英砂岩、含砾砂岩与块状砾岩,厚400余米,与下伏冷家溪群为不整合接触。南沱组为冰碛砾岩,厚98m。陡山沱组下部主要为灰黑色炭质、泥质灰岩,上部为白云岩夹磷矿层,共厚481m。灯影组下部为白云岩、硅质白云岩,含礈石条带白云岩,
The Sinian strata in the Shimen area of western Hunan are well developed. In 1980, I participated in the determination of the Yangjiaping Sinian section of the area, the system collected samples of the micro-ancient plants, Comrade Chen De Rou analysis found that the combination of micro-ancient plants, including more than 20 genus, more than 50 species. The Yangjiaping Sinian section includes bottom-up Liande Formation, Nantuo Formation, Doushantuo Formation and Deng Ying Formation. The Lintuo Formation is purple-red, dark purple-red sandstone, quartz sandstone, pebbly sandstone and massive conglomerate with a thickness of over 400 meters, which is unconformable contact with the Xiajiaxi Group. Nantuo Formation is a moraine conglomerate, thickness 98m. The lower part of the Doushantuo Formation is mainly composed of gray-black carbonaceous and argillaceous limestone with dolomite-bearing phosphate rock formations in the upper part, a total of 481m thick. The lower part of the Dengying Formation is a dolomite, a siliceous dolomite, a dolomite with a limonite band,