S.V.Nikolaeva, E.I.Kulagina, V.I.Pazukhin, N.A.Kucheva, T.I.Stepanova, N.N.Kochetova,
N.B.Gibshman, E.O.Amon, V.A.Konovalova & G.F. Zainakaeva:

Conclusions:

(1) Based on this study the correlation of the regional stages (horizons) previously
established in the Russian Platform and the Urals is updated.
 (2) The Venevian in the South Urals is dated by the conodonts Lochriea nodosa and
L. mononodosa and ammonoids of the Hypergoniatites-Ferganoceras Genozone.  
These ammonoids are similar to those from the Viséan C in Germany, and the lower
P2 in the UK (uppennost Brigantian).  Correlation with the ornatissimum
 Zone in Texas is also possible.
 (3) The base of the Serpukliovian equates to the base of the Kosogorskian and
 corresponds to the base of the Lochriea ziegleri Zone. This level in the type
Serpukhovian section in Zaborie is close to the appearance of the foraininifers
"Millerella" tortula and Neoarchaediscus postrugosus, which may be useful for
correlation witli the Chesterian.
(4) The base of the Uralopronorites-Cravenoceras
 Genozone at Verkhnyaya Kardailovka is about 75 cm above
 the first appearance of Lochriea zi'egleri.  However, it is
 evidentIy not the oldest Uralopronorites-Cravenoceras ammonoid fauna,
 because the mixed assemblage containing uppennost Viséan and lowermost
 Serpukhovian ammonoid taxa reported by Ruzhencev and Bogoslovskava
 from Dombar and Kzyl-Shin has not yet been found at Verkhnyaya Kardailovka.
 (5) The interval of beds 22-24 (all of the Kosogorskian and the lower part of
 the Khudolazovian) (=Uralopronorites-Cravenoceraas Genozone) correlates to
 the A1 Zone and probably the Tumulites varians Zone in
 America.   Species Cravenoceras of similar age are found
 in the Tarusian and Steshevian in the Moscow Basin.
 (6) The base of the Khudolazoviali coincides with the appearance of the
  forarninifer Eostaffellina paraprotvae. It is reliably correlated to the upper
   Steshevian in the Moscow Basin. The upper Khudolazovian contains
   ammonoids of the lower part of the Fayettevillea-Delepinoceras Genozone
    (= E. paucinodum -E.rotuliforme in America and the Lower Arnsbergian in Europe).
    (7) The Yuldubaevian is dated by ammonoids characteristic of the upper
    part of the Fayettevillea-Delepinoceras Genozone. Eumorphoceras trans-
    uralense, which is similar to Eumorphoceras species from the E2 in Europe,
    suggests correlation with the Upper Arnsbergian and the Eumorphoceras
    girtyi, Cravenoceratoides nititoides, and Delepinoceras thallasoide
     Zones in America. The foraminifer Monotaxinoides transitorius suggests
     correlation with the Zapaltyubinian of the Donets Basin and the upper part
     of the Upper Arnsbergian Cf 7 Zone in the Dinant Basin.