Chronostratigraphy
original chronostratigraphic description (Geologica Belgica 2006)
- CHRONOSTRATIGRAPHIC UNITS NAMED FROM BELGIUM AND ADJACENT AREAS - Preface
Alain PREAT, Pierre BULTYNCK & Denise BRICE GIVETIAN- Marie Coen-Aubert & Frédéric BOULVAIN FRASNIAN
- Jacques THOREZ, Roland DREESEN & Maurice STREEL FAMENNIAN
Maurice STREEL, Denise BRICE & Bruno MISTIAEN STRUNIAN