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通过对文县一带 1∶ 5万区域地质调查 ,认为该区内白垩系紫红色砾岩、泥岩、灰色页岩 ,系受秦岭造山带燕山期构造控制的山麓 -河湖相沉积。在灰色页岩中首次发现了 Lycoptera sp.鱼类及丰富的植物化石 ,证实其属早白垩世沉积。将其与徽成盆地的东河群相对比 ,为秦岭中生代地史演化提供了新的信息。根据沉积学研究将其划分为4种类型 ,圈定了其空间展布。砾岩、砂岩系碎屑流沉积 ,而紫红色泥岩、灰色页岩则为典型的湖盆相沉积 ,两者在很大程度上属同期异相沉积。
Through the 1: 50000 regional geological survey in Wenxian area, it is concluded that the Cretaceous purplish red conglomerate, mudstone and gray shale in this area are impacted by the foothills of the Yanshanian structure of the Qinling orogenic belt. Lycoptera sp. Fishes and abundant plant fossils were first found in gray shale, confirming the Early Cretaceous sediments. Compared with Donghe Group in Hui-Cheng Basin, it provides new information for the evolution of Mesozoic geography in the Qinling Mountains. According to sedimentology research it is divided into four types, delineating its spatial distribution. Conglomerates and sandstones are clastic flow depositions, while mauve mudstone and gray shale are typical lacustrine facies sediments, both of which are largely belong to contemporaneous heterogeneous deposition.