所有资料均证明在西秦岭北坡(甘肃南部)到处分布着上泥盆纪的磨拉石建造(大草滩群)。这种事实说明北秦岭地槽在中泥盆纪后已完全迴返。但在石炭一二迭纪时,在迴返后形成的山前凹陷基础上又发展成为上古生代的残余地槽带,一直到海西末期(部分到印支期)才完全迴返。西秦岭地槽发育的特点是多旋迴的,大致可分为早期的地槽阶段与晚期的残余地槽阶段两部分,在早期地槽阶段形成火山喷发沉积及类複理石建造等,而晚期残余地槽阶段则多形成碳酸盐建造,这种情况在南北秦岭地槽的发育过程中均能见到。所有贷料同样也证明南秦岭加里东地槽和中秦岭海西残余地槽在秦岭东西段是都发育的,而北秦岭海西地槽仅发育在西段(甘肃南部及更西地方),它向东被秦岭地轴封闭了,推测封闭处是深断裂带。 All the data show that the Upper Devonian molasse (the Grand Beach Complex) is distributed in the northern slope of West Qinling (southern Gansu). This fact shows that the North Qinling Gully has completely returned after the Middle Devonian. However, on the basis of the piedmont depression formed after the return of Carboniferous and Permian, it developed into a remnant zone of the Upper Paleozoic and did not return completely till the end of the Hercynian period (part of the Indosinian period). The features of the West Qinling geosyncline are multi-cycle. They can be roughly divided into two parts, the early geosyncline and the late tectonic stage, and the formation of volcanic eruptions and the class of flysch formation in the early geosyncline. In the late stage of residual geosyncline, more carbonates were formed, which can be seen during the development of the Qinling terrane in both North and South China. All loans also prove that both the Caledonian trough in the South Qinling Mountains and the remnant troughs in the West Qinling Hercynian are developed in the east and west Qinling Mountains, while the Haixi trough in the North Qinling only develops in the western (southern Gansu and westward) It is closed to the east by the Qinling axis, suggesting that the seal is a deep fault zone.