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| details | Visean | USSR(Urals) | Byvsheva,T.V. Palynological character and stratigraphical arrangement of the Bobrikov horizon as found in the Lower Carboniferous Period of the Volga-Urals Region. | 1967 | |
| details | Early Carboniferous | USSR(Moscow Basin) | Byvsheva,T.V. Palynological character and stratigraphical arrangement of the Bobrikov horizon as found in the Lower Carboniferous Period of the Volga-Urals Region. | 1967 |