One of the controversial and still debated issues of sequence stratigraphy is the assessment of stratigraphic surfaces in a chronostratigraphic framework (Catuneanu, 2006.) To assess whether the bounding surfaces of systems tracts or sequences are isochronous or diachronous is of paramount importance for stratigraphic correlation. New software developments enable us to study stratigraphic surfaces within such a chronostratigraphic framework and allow us to predict something about their time attributes." © 2007 Society of Exploration Geophysicists."