Chronostratigraphy
Status 2006 of Chronostratigraphic terminology in use: http://popups.ulg.ac.be/Geol/sommaire.php?id=979
Dominique DELSATE & Frédéric BOULVAIN DISUSED JURASSIC REGIONAL STAGE FROM BELGIUM: VIRTONIAN
Status 2006 of Chronostratigraphic terminology in use: http://popups.ulg.ac.be/Geol/sommaire.php?id=979
Dominique DELSATE & Frédéric BOULVAIN DISUSED JURASSIC REGIONAL STAGE FROM BELGIUM: VIRTONIAN