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湘西北区,也即湖南武陵山脉的西北部,下石炭统的分布范围是一直有争论的问题。1973年中南矿冶学院地质系四○三教改队(以下简称矿冶教改队)在石门太清山南坡孙家墩附近找到Kueichouphyllum sinense,Fusella sp.,Camarotoechia kinglingensis等早石炭世的标准化石,证明该区有下石炭统无疑。胡坪——磺厂——新铺一线以南的绝大部分地区,下二叠统黔阳段假整合于晚泥盆世或更古老的地层之上,无下石炭统,其意见也比较一致。问题在于这两区之间的地带有无下石炭统。争论的焦点往往归结于含Yunnanella动物群的写经寺组泥灰岩之上的一套“砂页岩系”是属于晚泥盆世还是早石炭世。1985年,笔者在澧县羊耳山一带指导填图实习,正在这有争议的区域内,对该区有无下石炭统作了些探讨。
The northwestern part of Hunan, ie, the northwestern part of Wuling Mountain in Hunan Province, has been the subject of controversy over the distribution of the Lower Carboniferous. 1973 Zhongnan Mining and Metallurgy Institute Department of Geology 403 reform team (hereinafter referred to as the Mining and Metallurgical Reform Team) found in the Shimen Taiqingshan southern slope near the Sunjundun found Kueichouphyllum sinense, Fusella sp., Camarotoechia kinglingensis other standard carboniferous fossils, that There is no doubt that the area is under the Carboniferous. Huping - Sulfur Factory - most of the area south of the new shop, the Lower Permian and Qianyang sections are integrated into the Late Devonian or older strata, with no Lower Carboniferous, and their views are also compared Consistent. The problem is that there is no Lower Carboniferous zone between these two areas. The focus of the debate is often attributed to whether a set of “sand shale” above the Writings of the Yunnanella fauna belongs to the Late Devonian or the Early Carboniferous. In 1985, the author guided the mapping practice in the area of Sheyangshan in Shexian County. In this controversial area, there are some discussions on the existence of the Lower Carboniferous in this area.