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Geolocation
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Author - title
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Year
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| details | Ypresian | Belgium | De Coninck,J. Stratigraphic application of organic microfossils in the Ypresian of the Belgian Basin. | 1971 | |
| details | Ypresian | Belgium | De Coninck,J. Ypresian organic walled microfossils from the Belgian Basin. | 1975 |