New data on stratigraphy and an updated correlation scheme of the Upper Ordovician and Silurian of the Timan-Pechora oil and gas province and the North of the Urals

The paper presents the results of studies which contribute to solving the most controversial problems of the Silurian disintegration, the position of the regional boundaries of the Ordovician-Silurian, Llandovery-Wenlock, Ludlow-Pri-doli, which showed the need to review and clarify the existing stratigraphic schemes of the study area. The correlation diagram of the Upper Ordovician and Silurian strata drilled by wells in the northeastern subregion of the East European platform (Timan- Pechora region) and coeval deposits of the West Urals subregion is given. The correlation of age and facies complexes of fossil marine fauna, as well as data on the isotopic composition of carbon in carbonates, allowed us to conclude that there were interruptions in sedimentation at the turn of Llandove-ry and Wenlock and at the end of Ludlow.