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Author - title
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Year
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| details | Ordovician | Early Devonian | USSR(Buryat ASSR) | Butov,Y.P. Some problems of Pre-Mesozoic stratigraphy of Savan-Baikal Mountain Region. 2. New data on the age of Pre-Mesozoic deposits. | 1986 |
| details | Silurian | Early Devonian | USSR(Vologda) | Batanova,G.P. et al. Age of Pre-Middle Devonian sediments of the Volgograd District. | 1972 |