N. Mouravieff

A preliminary study of Ashgill carbonate beds from the lower part of the Fosses Formation (Condroz, Belgium)

B. Mamet, A. Préat, F. Tourneur, 1993, Geological Magazine.

Upper Givetian and Frasnian ichthyoliths from Bas-Boulonnais (Pas-de-Calais, France) : preliminary records

C. Derycke, A. Blieck, D. Brice, 1995 .

The Frasnian-Famennian Boundary in Belgium.

J. Thorez, M. Streel, J. Bouckaert, 1972 .