odds with the assumed Early Cretaceous age of
the Cañadón Calcáreo Formation. Curiously, however,
they did not apply the same logic to the conflicting
dates of the Las Chacritas and Puesto
Almada members, though the time difference
between the radiometric Tithonian age of Puesto
Almada and the assumed Valanginian age of the
type section of the Cañadón Calcáreo Formation is
considerably less than that between the former and
the radiometrically obtained Bajocian-Bathonain
age for the Las Chacritas Member (≈9 m.y. versus
≈20 m.y.; Gradstein et al., 2004) of the Cañadón
Asfalto Formation.