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Geolocation
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Author - title
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Year
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| details | Couvinian | Givetian | Belgium | Streel,M. Palaeobotanic information on the Lower-Middle Devonian boundary in the Ardenno-Rhenean Geosyncline. | 1965 |
| original | Early Givetian | Belgium | Streel,M. An association of spores from the Lower Givetian of the Vesdre at Goe, Belgium. | 1964 |