Shujiaba Group (D_2-3S) is an important ore-bearing stratum of the tectonic altered rock type gold deposits in the northern belt of the West Qinling Mountains. It is a set of shallow metamorphic fine clastic rocks with the sedimentary characteristics of flysch and a small quantity of carbonate rocks. The combined rocks were formed in Middle-Late Devonian. According to the 1:50 000 regional geological survey, a set of volcanic-pyroclastic rock series was formed in the Haibangou in northern Liangdang County of West Qinling, which was originally designated as Shujiaba Group. According to zircon LA-ICP-MS U-Pb dating, the weighted mean average age of rhyolitic crystal tuff is 204±2 Ma and that of dacite porphyry is 209±3 Ma respectively, indicating that the volcanic-pyroclastic rock series was formed in the Late Triassic. Therefore, it was disintegrated from Shujiaba Group and is temporarily placed in the Huari Formation (T₃hr).