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| details | Valanginian | Hauterivian | USSR(Yakut ASSR) | Pokrovskaya,I.M. Lower Cretaceous spore-pollen complexes Anabar-Kha Tanga interfluv, Khatanga and Pre-Verkhoyansk Synec Lises and Vilyuy Depression. (In: Atlas of Lower Cretaceous spore-pollen complexes of some regions of USSR. I.M.Pokyovsksys and N.K.Stel'mak, editors) | 1964 |
| details | Tithonian | USSR(Yakut ASSR) | Vakhrameev,V.A. et al. Paleobotanical data and the Border Line between Jurassic and Cretaceous Systems. | 1973 |