A New Ammonite Biostratigraphic Framework for Distal Urgonian Successions of North Provence and a Correlation with Southern Vercors

New ammonite discoveries from the south-facing flank of Mont Ventoux (southern France) provide robust and refined age constraints on the maximum northward progradation of Urgonian depositional environments in northern Provence during the late Barremian to early Aptian. The succession records distal Urgonian depositional environments during the late Barremian, spanning from the Toxancyloceras vandenheckii to the upper Gerhardtia sartousiana Zone, followed by strongly progradational distal Urgonian deposits with an age interval from the terminal Barremian into the early Aptian. These new data permit an updated and simplified regional correlation of Urgonian successions across the Barremian–Aptian boundary in northern Provence and along the northern margin of the Vocontian Basin. Our correlations reveal clear, coeval sedimentary signals across both regions, emphasizing the regional synchronicity of Urgonian platform development at the basin scale.