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| details | Oxfordian | France(Calvados) | Deflandre,G. On the microplankton of Jurassic Seas preserved in the organic matter state in the marls of Villers-sur-Mer. | 1938 | |
| original | Early Oxfordian | France(Calvados) | Deflandre,G. On the microplankton of Jurassic Seas preserved in the organic matter state in the marls of Villers-sur-Mer. | 1938 |