1981  Wang, p.480: upper Yamansu Fm. (lower Carboniferous), lower part with Dombarites, Platygoniatites, Irinoceras, lower Eumorphoceras Zone (E1), middle part with Proshumardites  (E2), upper part with Gastrioceras, Branneroceras, Syngastrioceras located in lowermost Dikar Group in the Yamansu area of Eastern Xinjiang. From upper Yamansu Fm. in southeastern Aqishan area only one specimen, holotype of Aqishanoceras bellum, not definitely  assigned to stage or group. Smilarity of conch, ornamentation and suture suggests that genus Aqishanoceras belongs to Diaboloceras-Winslowoceras Genozone or younger.