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Our contribution presents an integrated litho-, bio- and chemostratigraphic study of the best-preserved outcrops of the post-Urgonian marly cover (A¹ unit) of the North Provence carbonate platform. The study of the rich ammonite fauna from the Apt–Gargas area (SE Vaucluse) confirms that the A¹ unit is older than previously assumed and dated to the upper (but non-uppermost) part of the lower Aptian Deshayesites forbesi Zone of the Mediterranean standard zonation. This interval is assigned to the lower part of the Roloboceras hambrovi Subzone as defined in the present contribution which is time equivalent to the spreading of the OAE 1a. Microfossil occurrences previously documented in the A¹ unit are consistent with our ammonite-age calibration. Unfortunately, the curves of the carbon and oxygen stable isotopes exhibit a correlative signal probably caused by an early diagenetic overprint which questions the …