TY JOUR TI Conodont stratigraphy and correlation of the Ordovician volcanogenic and volcanogenic sedimentary sequences in the South Urals KW Stratigraphy KW Ordovician KW conodonts KW formations KW "faunal beds'' KW biofacies KW volcanogenic sedimentary deposits KW South Urals. JO Russian Journal of Earth Sciences AU Dubinina, S.V. AU Ryazantsev, A.V. PY 2008 IS 10 PB Geophysical Center of the Russian Academy of Sciences