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长期以来,地质工作者一直将陕西省山阳县、凤县、旬阳县等地区的石炭系底界置于界河街组底部,认为该区石炭系缺失杜内期沉积,而把属于微宪期沉积的界河街组视为早石炭世的最低层位。近年来,笔者在参加《陕西秦巴地区泥盆系研究》工作中,曾多次对凤县瓦房坝熊家山剖面,山阳县板岩镇剪子沟—北沟寺山岔剖面,以及旬阳县冷水河南羊山和镇安腰庄河水田沟等剖面上的泥盆、石炭系介线,进行了系统的生物地层研究,结果发现原划上泥盆统九里坪组或铁山组顶部有一套化石丰富、厚约26—50m 的地层,整合于现划上泥盆统南
For a long time, geologists have placed the bottom of the Carboniferous in Shanyang, Fengxian, Xunyang and other areas of Shaanxi Province at the bottom of the Jiefangjie Formation. They believe that the Carboniferous in this area lacks the Dunesian sediments, The Jiehejie Formation deposited as the lowest stage of the Early Carboniferous. In recent years, the author participated in the “Shaanxi Qinba Basin Devonian Research” work, many times on the Fengxian Wafangba Xiongjiashan section, Sanyo County, Slate Town Shek Ziguo - Beigou Temple Shancha profile, as well as Xunyang And the Devonian and Carboniferous lineages in the Lengshu River in South Yangxian County and the Zhenzhuang Longzhuang River. The results show that there is a Set of fossil rich, about 26-50m thick strata, integrated in the Devon South