川西高原中三叠统研究程度较差,特别是拉丁阶尚无可靠生物化石证据。有人认为缺失拉丁阶,也有人认为中三叠统或拉丁阶存在,但都是推断。例如义敦地区的列衣组、洁地组、比友沟组、三珠山组、马索山组和马尔康—雅江地区的杂谷脑组、扎尕山群、横崖框组、马鞍梁组、杉木坪子组、两叉河子组等,过去全部或部分划为中三叠统或对比为拉丁 The study of the Middle Triassic in western Sichuan Plateau is poorly studied, especially for the evidence of reliable biological fossils in the Latin order. Some people think that there is a lack of Latin order, some people think that the Middle Triassic or Latin order exists, but are inferred. For example, the Liunai Formation, Jiedi Formation, Biyougou Formation, Sanzhushan Formation, Masuo Mountain Formation, Zhagu Mountain Formation, Zhaogashan Formation, Yuliangshan Formation, Group, Chinese fir sub-group, two fork River group, all or part of the past designated as the Middle Triassic or contrast to Latin