TY JOUR TI Lower Serpukhovian carbonate psephitolites in the central part of the Chernyshev Ridge KW carbonate psephitolites KW Serpukhovian KW Lower Carboniferous KW Chernyshev Ridge JO Vestnik of geosciences AU Sandula, A.N. PY 2022 IS 0 PB FSBI FIC "Komi Scientific Center of the Ural Branch of the Russian Academy of Sciences"