Yuliangze Fm., probably Late Maastrichtian (accordingly to P. Godefroit et
al.'s publication).
As was mentioned earlier, the putative late Maastrichtian age was based
on a misinterpretation of the palynmorph Wodehousia spinata. Others give an
age of early-mid Maastrichtian for Tsagayan localities, and taxa such as
Amurosaurus, Charonosaurus etc.