Authors Year Title
Andrianov 1966 Verkhnepaleozoiskie otlozhenia zapadnogo Verkhoiania (Tompo-etchiskoe mezhdurechie).
1-131, 28 text-figs., 3 pls., Moskva (Nauka).
Andrianov 1985 Permskie i nekotorye kamennougol'nye ammonoidei Severo-Vostoka Azii.
Novosibirsk Izdatel'stvo Nauka, Sibirskoe Otdelenie, 1985: 1-180, fig.1-54, pl.A,B,1-21; Novosibirsk.
Bogoslovskaya, Leonova & Shkolin 1995 The Carboniferous-Permian boundary and ammonoids from the Aidaralesh section, southern Urals.
Journal of Paleontology 69: 288-301, 12 figs., Lawrence, KS.
Nassichuk & Spinosa 1972 Early Permian (Asselian) ammonoids from the Hare Fiord Formation, Northern Ellesmere Island.
Journal of Paleontology, 46 (4): 536-544, fig.1-5, tab.1-3, 1pl.; Tulsa, Okla.
Sheng & Liu 1983 Early Permian ammonites fauna from Jiajia area, Xizang (Tibet).
The geology of the Qinghai-Xizang (Tibet) Plateau: 237-252, fig.1-11, pl.20; Beijing.
Zhou 1989 Age of the Longyin Formation in Southwest Guizhou province.
Science in China (ser.B) 32: 1361-1370, 1 fig., 2 tabl., 1 pl.