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Author - title
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| original | Bajocian | Bathonian | France(Poitou) | Valensi,L. Microfossils from flint of the Middle Jurassic. Petrographic remarks. | 1953 |
| original | Bajocian | France(Poitou) | Valensi,L. Microfossils from flint of the Middle Jurassic. Petrographic remarks. | 1953 |