Lower Llanvirn (Ordovician) Graptolites and Acritarchs from the "Assise de Huy", bande de Sambre-et-Meuse, Belgium

The Huy formation («assise de Huy») is the oldest unit present in outcrops in the Belgian «Bande de Sambre-et-Meuse». Graptolites and acritarchs show that the beds are of early Llanvirn Didymograptus artus Biozone age. The localities of Huy and of Sart-Bernard and the Wépion borehole are reinvestigated and the collection of Maillieux, 1939 is restudied.