TY JOUR TI Timan-northern Ural region — a model site for Paleozoic reef formation KW reefs KW mounds KW reef ecosystem KW reef framework KW reef formation KW evolution KW Timan-northern Ural region JO Vestnik of geosciences AU Antoshkina, A.I. PY 2026 IS 0 PB FSBI FIC "Komi Scientific Center of the Ural Branch of the Russian Academy of Sciences"