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Table 3

Stable isotope data for stromatolites and nodules sampled at Créchy (CRE), Montaigu-le-Blin (MLB), Chavroches (CHA) and Gannat (GAN).

Age Biozone Stromatolite δ18OPDB δ13CPDB Nodules δ18OPDB δ13CPDB
Aquitanian MN2 MLB
(4)-MLB −4.5 −9.1
Near the Chattian/Aquitanian boundary MP30/MN1 CRE (3) −2.2 1.5 (3)-CRE −5.1 −4.5
Chattian MP30 GAN
CRE (2)
  MP29 CRE (1) (average) −2.9 −4.2      

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