The conodonts from the Xiaohaizi section of the Bachu area in Xinjiang were identified by some authors as Icriodm deformatus, who placed the Frasnian-Famennian boundary at the base of the Middle Member of the Bachu Formation, and assigned the Donghetang Formation to the Frasnian in age. However, their identification is incorrect; it is not Icriodus deformatus, but may be a new species of Icriodm, in the late Famennian. The Devonian-Carboniferous boundary should fall within the lower part of the Middle Member of the Bachu Formation, and the Donghetang Formation may be Famennian in age.