Two small  collections of cephalopods from the Aifat Formation, Aifam Group of western lrian Jaya comprise
  taxa most closely comparable with forms, from the late Lower Pennian (Artinskian Series, Baigendzhinian
  Stage).  This dating supports a recent dating of the same strata by means of brachinpods.  The Pseudoschisto-
  cerax irianense, sp.nov. from the Aifam River, may be conspecific with specimens described from the Bitauni
  area of Timor.  Other congeneric species occur in the Artinskian of Timor and Western Australia.  Nautiloids
  frorn the Aifat River, referred to ?Gzheloccras sp., have their closest relatives in the Baigendzhinlan Stage of
  the Southern Urals, and possibly also in beds of comparabte age at Bitauni.