| Geology | The fossil-bearing slab does not yield any microfossils for dating; the same horizon on the Yunnan side of the Huangnihe River contains conodonts belonging to the Paragondolella naantangensis- P. polygnathiformis Assemblage Zone, Carnian, early Late Triassic (Yang et al., 1995; Wang, 1996; Wang et al., 1998; 2001).
Carnian |