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Author - title
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Year
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| details | Early Eocene | Middle Oligocene | USSR(WSL) | Lyubomirova,K.A. Paleogene Hamamelidaceae spores from Northwestern Siberia | 1965 |
| details | Bartonian | USSR(WSL) | Kulkova,I.A. Eocene plant microfossils of West Siberia. (In: Mikrofitofossilii i stratigrafiya Mezozzoya i Kainozoya Sibiri. S.B. Shatskiy, editor) | 1988 |