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Geolocation
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Author - title
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Year
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| details | Ufimian | USSR(Kazakh SSR) | Kukhtinov,D.A. et al. The Ufimian Stage of the South-East Russian Platform. (In: The Phanerozoic of the Northern European Part of the USSR.) | 1980 | |
| details | Kungurian | USSR(Russian Platform) | Abramova,S.A. et al. The problem of classifying forms of genus Vittatina, Lub., and forms with a ribbed body and air sacs. (Taxonomy and Methods for the Study of Fossl Pollen and Spores. V.N. Saks and A.F. Khlonova, editors) | 1964 |