Characteristics and significance of the Late Permian sporopollen assemblage in the Gongjiubu area, Ngamring, southern Tibet, China.

The Dibuco Formation in the Gongjiubu area is distributed in the Lunggar-Namling stratigraphic subregion. It contains abundant sporopollen, which is characterized by sporopollen of the Cathaysia flora and a plenty of plant fossils. They are early Late Permian in age. The sporopollen Vetreisporites signatus-Limitisporites rectus assemblage may be established on the basis of the characteristics of the sporopollen evolution, which enriches the content of paleontological research and provides fundamental data for the study of the Late Permian sedimentary environment, paleoecology, biogeographic provinces and geological evolutionary history. According to these data, combined with regional geological data, it is thought that the sporopollen assemblage has undergone a gradual evolutionary process from the mixture of the Gondwana flora and Cathaysia flora to the typical Cathaysia.