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From
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To
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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 |
| details | Couvinian | Late Givetian | Libya | Massa,D. et al. Stratigraphic and palynological synthesis of the Devonian system in Western Libya. | 1976 |