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川西北地区三叠系广泛发育，其地层层序及岩性特征与相邻的西秦岭南部一带十分相似。根据若尔盖—南坪实测地层剖面资料的对比研究，将该区三叠系划分为：中三叠统光盖山组和上三叠统咀朗组、纳鲁组、卡车组４个岩石地层单位。通过沉积相标志的综合分析，该区中—晚三叠世时期主要有以下几种沉积类型：碳酸盐岩碎屑流沉积，等深流沉积，陆源碎屑浊流沉积，非重力流正常深海盆碳酸盐岩及碎屑岩沉积。表明该区为大陆斜坡至深海盆地环境
The Triassic in northwestern Sichuan developed widely, and its stratigraphic sequence and lithological characteristics are very similar to those of the adjacent western Qinling Mountains. According to the data of Zoigai-Nanping stratigraphic data, the Triassic strata of the area are divided into three parts: the Middle Triassic Guangaishan Formation and the Upper Triassic Mulang Formation, Naru Formation and Trucks Formation . Based on the comprehensive analysis of sedimentary facies markers, the following sedimentary types are mainly found in the middle-late Triassic: Carbonate clastic flow deposition, isochord flow sedimentation, terrigenous debris turbidity flow deposition, non-gravity flow normal Deep basin carbonate and clastic sediments. It shows that the area is from continental slope to deep sea basin environment