The sporopollen assemblage found from the upper part of the Totohe formation are characterized by the dominace of angiospermous pollen, most of the sporopollens being the common elements of Paleogene.

• 沱沱河组上部的孢粉化石组合以被子植物花粉为主，且主要为三沟和三孔沟类，包括栎粉属（尤其是小栎粉和小亨氏栎粉）、楝粉属、坡氏粉属和三孔沟粉属等，具孔类花粉很少，大部分属种为古近纪常见分子；