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西秦岭南带志留系已发现１４个笔石层位，划分为１０ 个笔石带，４ 个笔石层，它们分别是：下志留统８ 个笔石带，２ 个笔石层；中志留统２ 个笔石带；上志留统２ 个笔石层。
14 Silurian strata have been discovered in the Silurian System of the southwestern Qinling Mountains. They are divided into 10 penoliths and 4 penoliths. They are: the Lower Silurian, 8 pen-shaped straps and 2 penoliths; In the Uranus 2 pen stone belt; Ulysses left two pen layers.