Keerduo Mountain in Xianza, Tibet (88.694, 31.182, Dewukaxia Formation)
Ni, Y.N. 1987.  Lower Silurian graptolites from Xainza, northern Xizang. Bulletin of Nanjing Institute of Geology and Palaeontology, Academica Sinica No. 11, 232-268, with 14 plates.