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Among various paleoenvironmental proxy records across the lower Aptian Selli Level (Umbria-Marche basin, Italy) and its equivalents (i.e., sedimentary expressions of oceanic anoxic event [OAE] 1a), one very intriguing feature is a prominent negative δ13C excursion at the base of this sedimentary unit, generally by as much as a few per mil in marine carbonates. This early Aptian δ13C event has received special attention as an important clue to the genesis of OAE 1a, but the exact amplitude of this relatively short lived δ13C variation is not precisely constrained, and this fact has been...

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