to their scheme, the “estratos de Almada” belong to
megasequence II, whereas the Cañadón Asfalto
Formation sensu Stipanicic et al. (1968) belongs to
the megasequence I, with both sequences being
separated by a slight angular unconformity. These
authors accepted the Callovian-Oxfordian age for
the megasequence I (Cañadón Asfalto Formation
sensu Stipanicic et al., 1968), but argued for a latest
Jurassic to Early Cretaceous age for their
megasequence II, citing biostratigraphic evidence
from unpublished internal reports of the oil company