Cyatheacea
- Citations total:
- 2
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| details | Oligocene | Early Miocene | USSR(Ukrainian SSR) | Rotman,R.N. Spore-pollen composition of the Brown Coals of the Chesterintzy deposits of the Knieper Basin of USSR | 1956 |
| details | Middle Oligocene | Late Oligocene | USSR(Primorsk Kray) | Akhmeteev,M.A. The Oligocene and Miocene floras in the Soviet South Far East as indicators of climatic environments | 1974 |