Paleoecological and paleobiogeographical regularities in the evolution of tabulates in late Ordovician and early Silurian in the north of the Urals

The paper analyzes paleoecological and paleobiogeographic regularities of tabulation evolution in the Late Ordovician and Early Silurian in the north of the Urals. By now there are no works completely describing the taxonomic composition, stratigraphic and geographical distribution and evolutionary development of Ordovician and Silurian tabulates of the north of the Urals. It is important to study the temporal and spatial distribution of tabulates, which is necessary for a more complete use of this group of benthos for practical purposes.