The purpose of the present paper is to show the succession and diversity of goniatites in
  this area.  The distribution of ammonoids in northern Russia is reviewed at the generic
  level in terms of global ammonoid genus-zones proposed by V.E. Ruzhencev and M.F. Bo-
  goslovskaya in 197 1. The record of goniatites in the northeastern Europe commences with
  the Upper Tournaisian, whereas in eastern Siberia their distribution is confined mainly to
  Upper Visean deposits.  Unequal investigation of Lower Carboniferous ammonoids in dif-
  ferent areas makes possible only a rough correlation of Russian genus-zones with other
  more detailed biozonations.
        Ammonoids of the Protocanites-Pericyclus and Merocanites-Ammonellipsites ge-
  nus-zones in Pai-Khoy and Pre-Polar Ural are the most diverse, and the latter zones are
  easily correlatable with mid-Dinantian zones of the British Isles (Riley, 1990a,b) where
  ammonoids from this interval are rather well represented, and some genera and species
  show similarity o those of Pai-Khoi and Pre-Polar Urals.  Late Visean goniatites are not so
  abundant in northern Russia as in Central Europe, on the basis of which a detailed bio-
  zonation was elaborated.  In this case, only a rough correlation is possible.  Two Serpu-
  khovian assemblages are the most abundant and diverse in reefal deposits on Berch Island.
        The genera recorded are mostly cosmopolitan.  The apparent endemic distribution of
  several genera known in mid-Dinantian deposits probably reflects the insufficient study of
  ammonoids from this interval in other areas.