在大巴山陕西岚皋白崖垭的红椿坝—曾家坝深大断裂带一带，志留系的陡山沟组和吴家河组的含碳粉砂质页岩和笔石页岩与辉绿岩、火山集块岩、粗面质玄武岩岩层和岩体相互间隔出现，特别是在粗面质玄武岩和火山集块岩岩体之上，整合覆盖着一层厚约19m的生物碎屑灰岩、20m左右的黑色笔石页岩和30m的绢云母化片岩，在笔石页岩中产丰富的早志留世晚期和中志留世的笔石化石：Oktavites spiralis， Cyrtograptus centrifugus 等。这一发现对确定大巴山区早古生代的岩浆活动的时限提供了可靠的化石证据，也为探讨秦岭岩浆活动的时代以及秦岭大地构造格局及其演化史具有重要意义。 In the Daba Shan Shaanxi Langyao Baiyaya red caves - Zengjiaba deep fault zone, Silurian Doushangou Formation and Wujiahe Formation carbonaceous silt shale and penolith shale and diabase, Volcanic rocks, coarse basaltic rock formations and rock mass are spaced apart from each other, especially on the top of the crude basalts and volcanic aggregates. The assemblage is covered by a layer of bioclastic limestone of about 19 m in thickness, Black penolith shale and 30m sericitized schist, and the rich early Silurian petroglyphs of the Early Silurian and Middle Silurian rocks in the penolith shale: Oktavites spiralis, Cyrtograptus centrifugus and so on. This finding provides reliable fossil evidence for determining the age of the Early Paleozoic magmatism in the Daba Mountains and is of great significance in exploring the age of the Qinling magmatism and the geotectonic structure and evolution history of the Qinling Mountains.