About a gap below the Upper Frasnian strata in the southern part of the Ukhta anticline

A gap below the Upper Frasnian strata in sections located in the southern part of the Ukhta Anticline is recognized. An unconformity related to the gap is expressed in formation of «hard ground», by development of algal-stromatolitic buildups. The transgressiv type is bedded thickness of clays with the marine fauna and miospore Upper Evlanovo subhorizon. On this boundary take weight up of the isotope carbon and decrease in the oxygen isotope values.