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According to field logging of wells in Lower Carboniferous strata, the uplift is definitely marked with two stratigraphic boundaries – top of Zavolzhskian carbonate horizon of the Upper Devonian and top of Tulskian clastic complex of the Lower Carboniferous. The analysis of thickness between them shows that the Tulskian surface repeats Zavolzhskian surface, while modern surface of Tournaisian sediments has a complex differentiated nature due to erosion-karst processes. The reconstructed Tournasian surface repeats Zavolzhskian surface, i.e. we trace heredity of the Lower Carboniferous structural plan from the Upper Devonian.

The Results of Stratification of Tournasian Deposits on Uplifts with Erosion-karst Surface on the Example of Zyuzeevsky Field