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本文论述的北秦岭地区是指武山—天水以南,岷县—宕昌以北的秦岭北部地区。在地质历史上,本区是个沉降速度和堆积速度都很快的地区。由于受这种特殊构造条件和沉积环境的控制,所以泥盆纪沉积物主要是粗细不等的碎屑岩,沉积厚度巨大。叶连俊、关士聪曾将这套地层称为“西汉水系”,认为其时代相当于欧洲的吉维特阶。随着研究工作的不断深
The North Qinling area discussed in this article refers to the northern part of the Qinling Mountains to the north of Tianshui and Wushan to Minxian-Dangchang. In geological history, this area is a settlement speed and accumulation speed is very fast area. Due to this special tectonic setting and sedimentary environment control, the Devonian sediments are mainly clastic rocks of different thicknesses and thick sediments. Ye Lianjun, Guan Shicang called this formation “the Western Han River System”, believing that its era is equivalent to the Jeweled order of Europe. With the deepening of research work