Chronostratigraphy
Status 2006 of Chronostratigraphic terminology in use: http://popups.ulg.ac.be/Geol/sommaire.php?id=979
Francis ROBASZYNSKI MAASTRICHTIAN
Thierry MOORKENS & Jacques HERMAN DISUSED CRETACEOUS REGIONAL STAGE FROM BELGIUM: HERVIAN
Status 2006 of Chronostratigraphic terminology in use: http://popups.ulg.ac.be/Geol/sommaire.php?id=979
Francis ROBASZYNSKI MAASTRICHTIAN
Thierry MOORKENS & Jacques HERMAN DISUSED CRETACEOUS REGIONAL STAGE FROM BELGIUM: HERVIAN