Abstract
The Calcaire de Blacourt and the lower part of the Schistes de Beaulieu exposed in the new railroad trench Caffiers-Ferques and in the Griset Quarry (Boulonnais, France) contain well-preserved miospore assemblages which have been previously described from continental beds in Scotland, Spitsbergen and the Canadian Arctic Islands. Their distribution is presented in relation to a conodont zonation, ranging from the Icriodus obliquimarginatus Zone to the lower Polygnathus asymmetricus Zone, and allows accurate correlations with the type sections of Givet and Frasnes in Belgium where several optimal horizons could be selected to fix the Givetian/Frasnian (Middle-Upper Devonian) boundary.
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