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Geolocation
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Author - title
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Year
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| details | Early Permian | Late Permian | USSR(Komi ASSR) | Telnova,V.D. Correlation of Permian deposits of different facies in the northern part of the Cis-Urals Trough and in the Northeasern Part of the Russianp Latform. | 1974 |
| details | Early Westphalian D | West Virginia | Pierce,B.S. et al. Comparison of the petrography, palynology and paleobotany of the Stockton Coal Bed, West Virginia and implications for paleoenvironmental interpretation. | 1993 |