New data on Devonian and carboniferous boundary deposits in the Subpolar Urals (r. Syvyu)

The article presents new results of biostratigraphic and isotopic analyses for the Upper Famennian - Lower Tournaisian deep-water deposits of the Syvyu River section. Ostracode and conodont faunal changes, interpretation of lithological particularities and O and C isotopic variations enabled description of the boundary of the Systems, and identify stratigraphic equivalents of the Hangenberg Shale.