Graptolites et Chitinozoaires Siluriens de la vallée de la Burdinale, Massif du Brabant, Belgique

Assemblages of graptolites and chitinozoans are descnbed respectively by B. RICKARDS and J. VERNIERS from Silurian deposits which were studied in the Burdinale valley by J. VERNIERS (Ph. D. dissertation, 1976). These assemblages allow biostratigraphic zonations covering a time interval from late Llandovery to middle Wenlock.