“…Barbosa et al (1970), while studying the occurrences of the Areado Group in the regions of Patos de Minas and Carmo do Paranaíba, Minas Gerais State, recovered ostracods, charophytes and bone fragments. They determined that the ostracod fauna corresponded to that found in the Santana Formation, attributing an Aptian-Albian chronostratigraphic interval to the Quiricó Formation.Additionally, palynological studies by PETROBRAS on the black papyraceous shale from the Presidente Olegário region indicated a lower Aptian age(Barbosa et al 1970) Lima (1979). identified the Transitoripollis crisopolensis Palynozone, coded as P-230, corroborated by Arai et al (1995), which attributed the papyraceous shale to the Barremian(Campos & Do Carmo 2005).…”