The paper presents the results of studying the geological structure of the Ludlowian boundary sediments and data on lithology, bio-and chemostratigraphy, and large-scale biotic reconstruction at the boundary Ludlow-Pridoli. The results obtained make it possible to draw a conclusion about the stratigraphic incompleteness of the Ludlow section in the Subpolar Urals and the interruption in sedimentation at the end of the Ludlow.
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