In a geological study of an area northeast of
the type locality of Puesto Almada, Proserpio
(1987) defined a new geological unit, the Cañadón
Calcáreo Formation, of presumably Late Jurassic
to Early Cretaceous age. Though they maintained
the denomination as “upper section of the
Cañadón Asfalto Formation,” Figari and Courtade
(1993) noted that this Cañadón Calcáreo Formation
is equivalent to their megasequence II, in
which they also included the “estratos de Almada”
(see also Cortiñas, 1996; Page et al., 1999; Figari,
2005).