甘肃境内北秦岭的泥盆系,沉积厚度巨大,构造复杂。天水以南舒家坝一带地层的时代及层序,由于缺乏化石,长期以来成为区域地质工作的难点。以舒家坝一带最为发育的舒家坝群,原为关士聪、叶连俊命名的西汉水系的一部分。1968年,陕西地质局区测队进行1:20万填图时,将西汉水系以高桥一罗琐大断裂为界,分为南北两个相区,北区舒家坝一带为以砂岩、板岩和千枚岩为主并夹有火山岩及少量碳酸 The Devonian in the North Qinling Mountains in Gansu Province has a huge thickness and complex structure. The era and sequence of the strata in Shujiaba area, south of Tianshui, have long been the difficulty of regional geological work because of the lack of fossils. Shujiaba area to the most developed Shujiaba group, formerly known as Guan Shicong, Ye Lianjun part of the Western Han River system. In 1968, the Shaanxi Geological Bureau survey team 1: 200000 mapping, the Western Han River to Takahashi-Luozuo big fault as a boundary, divided into two north-south phase zone, the north area of ​​Shujiaba sandstone, Slate and phyllite dominated by volcanic rocks and a small amount of carbonated