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In recent years, δ¹³C and δ¹⁸O chemostratigraphy has become a powerful tool used to solve controversial results using different biological time markers from shallow-marine carbonate environments and establish long-distance correlations across proximal and distal settings. However, its reliability was recently questioned due to the impact of diagenesis on stable isotope records. The ammonite-calibrated, platform-to-basin transect of the late Barremian–early Aptian Urgonian Provence platform is made particularly relevant to challenge chemostratigraphy-based correlation methods in shallow carbonate series at different scales. The origin, preservation and stratigraphic potential of isotopic signatures are herein discussed along 11 shallow-marine and basinal sections. In the proximal settings of the Provence domain, tight carbonates—either resulting from muddy depositional textures or early cementation—likely …