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Author - title
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Year
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| details | Late Oligocene | USSR(Kazakh SSR) | Boytsova,E.P. et al. Data on stratigraphy of continental Oligocene and Miocene formations of Turgai Depression. | 1954 | |
| details | Early Jurassic | Early Cretaceous | USSR(Urals) | Pokrovskaya,I.M. The Basic Stages in the development of the vegetation of the Urals in the Mesozoic and Cenozoic from the data of pollen analysis | 1950 |