Echelle stratigraphique des systèmes cambrien et silurien en Belgique 
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SOC. GÉOL. DE BELG. ,T. XXXVIII. 
BIB.. 2. 
malis. Rhyolites anciennes. 
Schiste grisâtre celluleux à Phacops Stockesii. Porphy- 
roïdes. 
