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Author - title
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Year
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| details | Late Kimmeridgian | Late Volgian | USSR(WSL) | Voitsel,Z.A. et al. Spore and pollen assemblages of Jurassic deposits of the Ob'-Irtysh interfluve and their importance for stratigraphy. | 1966 |
| details | Ufimian | USSR(Kazakh SSR) | Zamarenov,A.K. et al. The Upper Permian sediments of the eastern side of the Fore-Caspian Depression. | 1972 |