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From
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To
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Geolocation
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Author - title
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Year
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| details | Permian | USSR(Urals) | Zauer,V.V. The Permian flora of Solikamsk | 1965 | |
| details | Kungurian | USSR(Urals) | Abramova,S.A. et al. Palynological investigations of Upper Kama's potassium deposits, underlying Kungurian Salt Layers. | 1960 |