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| details | Keuper | USSR(Tadzhik SSR) | Kuzichkina,Y.M. et al. Trial stratigraphic separation of Lower Mesozoic Continental deposits of Central Asia. (In: Problems of Biostratigraphy of the Continental Massif) | 1959 | |
| original | Late Triassic | USSR(Pre-Urals) | Brik,M.I. et al. Some Mesozoic ferns of SW Preurals and their spores. | 1955 |