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湘鄂边境地区泥盆系与石炭系的分界有两种意见:1.以含腕足Yunnanella-Yunnanellina组合的写经寺组之顶为界;2.以含植物Hamatophyton verticillatum-Lepidodendropsis hirmeri组合的梯子口组之顶为泥盆系的顶界,将含腕足Schuchertella geloehoense Yang的金陵组下段之底为石炭系的底界。争论的焦点在于对写经寺组之上、金陵组下段以下的
There are two kinds of opinions on the boundary between Devonian and Carboniferous in the border area of Hunan, Hubei and Hubei Province: (1) The boundary of Yunjingnella-Yunnanellina combination is composed of the top of the Sutra Temple group; (2) the ladder mouth with the combination of plants Hamatophyton verticillatum-Lepidodendropsis hirmeri The top of the group is the top boundary of the Devonian, and the bottom of the lower member of the Jinling Formation, which contains the brachiopod Schuchertella geloehoense Yang, is the bottom boundary of the Carboniferous. The focus of controversy lies on the following written by Temple Group, Jinling group below