The miospore genus Archaeoperisaccus is restricted to the late Givetian – possibly early Famennian, is most common in the Frasnian, and is known from northern Canada, Spitsbergen, western and eastern USSR, and China. Twenty-three species are briefly discussed and three, A. art us, A.regalis, and A. signus, are described as new. Eight species occur in the Frasnian portion of the Imperial Formation, District of Mackenzie.

You do not currently have access to this article.