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Author - title
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Year
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| details | Late Volgian | Berriasian | Russia(Siberia) | Lebedeva,N.K. et al. Dinoflagellate cysts and microforaminifera of the Lower Cretaceous Yatria River section, Subarctic Ural, northwest Siberia (Russia). Biostratigraphy, palaeoenvironmental and palaeogeographic discussion. | 1999 |
| details | Late Eocene | Rupelian | Belgium | De Coninck,J. Organic-walled phytoplankton biostratigraphy of the Eocene - Oligocene transition in the Kallo Borehole and the Rupelian stratotype area (northwestern Belgium). | 1999 |