TY JOUR TI Middle Darriwilian Small Stromatolite Bioherms and Spheroids (Oncoids) From the Moyero River Section (Siberian Platform) KW Middle Ordovician KW Siberian platform KW stromatolites KW oncoids KW microbialites KW Great Ordovician Biodiversification Event (GOBE) KW reservoirs JO Russian Journal of Earth Sciences AU Lykov, N.A. AU Zueva, O.. AU Dronov, A.. AU Postnikova, O.V. PY 2025 IS 25 PB Geophysical Center of the Russian Academy of Sciences