TY JOUR TI Microstructural features of Lower Permian ooid limestones (South Timan) KW carbonates KW limestones KW ooids KW organomineralization KW diagenesis KW biogenic microstructures JO Vestnik of geosciences AU Vetoshkina, O.S. PY 2025 IS 0 PB FSBI FIC "Komi Scientific Center of the Ural Branch of the Russian Academy of Sciences"