TY JOUR TI Paleoproterozoic stromatolites Segosia columnaris and Sundosia mira of the Eastern part of the Fennoscandian Shield: microstructure and 3D modeling KW stromatolites KW paleoproterozoic KW scanning electron microscopy KW 3D modeling KW carbonaceous matter JO Vestnik of geosciences AU Lyutikov, A.V. PY 2024 IS 0 PB FSBI FIC "Komi Scientific Center of the Ural Branch of the Russian Academy of Sciences"