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一、自然条件定西位于陇中高原的南部,大致位于北纬36°20′东经104°20′.而榆河社处于定西县东南10公里处.每一个到过陇中高原的人都知道,高原的东界为六盘山,西为河西走廊和祁连山,北为内蒙古高原,南为高耸云霄的秦岭.从地质构造上来看,定西属于陇西地块部分,陇西地块于下古生代时,四周被海水浸淹,地块成为孤岛.石炭纪时陇西地块与中朝地块和连,到二叠纪初期,则为中朝地块的一部分,而陇西地块的北部和西部的祁连山、南部秦岭地槽却受海西宁造山运动的影响成为折皱区.
I. Natural Conditions Dingxi is located in the south of the Longzhong Plateau, roughly at latitude 36o 20’N 104o 20 ’east longitude and Yuhe Club is 10 km southeast of Dingxi County. Everyone who has been to the Longzhong Plateau knows that the plateau East of the Liupanshan, west of the Hexi Corridor and the Qilian Mountains, north of the Inner Mongolia Plateau, south of the towering sky Qinling Geological structure from the point of view, Dingxi is part of Longxi block, Longxi block in the Paleozoic, surrounded by seawater During the Carboniferous, the Longxi block was connected with the Sino-DPRK block and even to the early Permian, it was part of the Sino-Korean block, while the northern and western Longxi block and Qilian Mountain in the west and the southern Qinling The trough has been affected by the Hercynian orogeny into a crumpled area.