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西和县位于秦岭山脉西段和甘肃省东南部。该区的泥盆纪地层最初由叶连俊、关士聪(1944)命名为西汉水系(1959年全国第一次地层会议更改为西汉水群),根据所含化石,时代大致定为中泥盆世。近年来,甘肃有色冶金勘探公司在进行矿产普查的同时,将洞山地区的泥盆纪地层命名为洞山组,并分为四个岩性段,第一、二段主要岩性为绿色板岩、钙质板岩、中厚层砂岩、砂质板岩夹泥质条带灰岩,第三段为灰色中至巨厚层祜结灰岩及泥粒灰岩,
West County is located in the western Qinling Mountains and southeastern Gansu Province. The Devonian strata in this area was originally named Yehliu Jun and Guan Shicong (1944) as the Western Han River System (the first strata conference was changed to the West Han River Group in 1959). According to the fossils contained, the age was roughly defined as the Middle Devonian. In recent years, Gansu non-ferrous metallurgical exploration company in mineral prospecting at the same time, the Dongshan area of the Devonian strata named Dongshan Formation and divided into four lithological sections, the first and second sections of the main lithology green slate, Calcareous slate, medium-thick sandstone and sandy slate with argillaceous limestone, the third segment is gray medium-thick layer of limestone and limestones,