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For the first time, from the lower part of the stratotype of the Liman Formation (district of the Mount Liman) data on diatoms and silicoflagellates were obtained, which allowed us to assign this part of the Liman Formation to the end of the Middle – beginning of the Late Miocene (Denticulopsis praedimorpha Zone, 12.9–11.5 Ma and Thalassiosira yabei Zone, 11.5–10.0 Ma by diatoms) and to establish the marine genesis of the host deposits. The upper part of the Liman Formation (district of the Peata cape) containing continental deposits, probably refers to the Late Miocene (?) – Calabrian Stage (Eopleistocene).