本文是刘孝忠同志所著“秦岭中段几个地质问题”一文中的一部分,该文的其余部分是:“秦岭中段的火成岩”,由于全文过长,无法一次刊登,所以这里先发表一部分。因作者本人不在西安,曾由编者作了一些文字上的更动.以后又根据作者的来信,作了几处修正。本文是作者56—58三年中在秦岭中段工作的成果,有一些新的资料与见解,特别可贵的是一些化石的获得,对解决秦岭地质问题提供了新的线索。 This article is part of a paper entitled “Several Geological Issues in the Middle Qinling Mountains” written by Comrade Liu Xiaozhong. The rest of the article is: “Igneous rocks in the middle part of Qinling Mountains”. Since the full text is too long to be published at the same time, we will first publish a part here. Because the author was not in Xi’an, he made some textual changes by the editor, and later made several amendments according to the author’s letter. This paper is the result of author 56-58 working in the middle section of Qinling in the past three years. There are some new data and opinions. What is particularly valuable is the acquisition of some fossils, which provides new clues for solving the geological problems in the Qinling Mountains.