Biostratigraphical and event-stratigraphical boundary of the ludlow and pridoli on the western slope of Subpolar Urals

The new results of studying of the geological structure of the Upper Silurian deposits on the Western slope of the Subpolar Urals are presented. Data analyses and synthesis allow us to establish bio- and event-stratigraphical boundary of the Ludlow-Pridoli and discover disconformity at the terminal Ludlow. These results suggest revision of the correlation of the Ludlow-Pridoli boundary beds of the Subpolar Urals and Estonia.