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四川若尔盖巴西—求吉地区晚三叠世首次发现了丰富的遗迹化石，经鉴定有２２个遗迹属、３４个遗迹种。根据不同遗迹属在不同层位中的相对丰度，建立了４个遗迹组合：（１）Ｈｅｌｍｉｎｔｈｏｐｓｉｓ—Ｐｈｙｃｏｓｉｐｈｏｎ组合；（２）Ｄｅｎｄｒｏｔｉｃｈｎｉｕｍ—Ｎｅｏｎｅｒｅｉｔｅｓ组合；（３）Ｐａｌｅｏｄｉｃｔｙｏｎ组合；（４）Ｔａｅｎｉｄｉｕｍ—Ｃｏｓｍｏｒｈａｐｈｅ组合。上述遗迹组合大致相当于Ｓｅｉｌａｃｈｅｒ的Ｚｏｐｈｙｃｏｓ遗迹相和Ｎｅｒｅｉｔｅｓ遗迹相。依据遗迹化石进行了沉积环境分析，认为该区晚三叠世的沉积环境经历了大陆斜坡中下部—大陆斜坡下部—深海盆地的演变。
For the first time, abundant trace fossils were found in the Late Triassic of Brazil-Ruichi area in Ruoergai, Sichuan. Twenty-two remains and 34 remains were identified. According to the relative abundance of different vestiges in different layers, four relic combinations were established: (1) Helminthopsis-Phycosiphon assemblage; (2) Dendrotichnium-Neonereites assemblage; (3) Paleodictyon assemblage; (4) Taenidi um-Cosmorhaphe combination. These relic combinations roughly correspond to Seilacher’s Zophycos and Nereites relics. Based on the analysis of the sedimentary environment of the trace fossils, the sedimentary environment of the Late Triassic in this area experienced the evolution of the mid-lower continental slope-lower continental slope-deep sea basin.