Fig. 2: Stratigraphy and isotope geochemistry of two Pliensbachian-Toarcian successions.
From: Ocean acidification at the Toarcian Anoxic Event captured by boron isotopes in the lime mud record
Boron isotope (δ11B) record (propagated uncertainty given as 2sƒ) for micrites, brachiopods and bivalves from Spain and Portugal (Methods). Cumulative carbon (δ13C) and oxygen (δ18O) isotope data (2sdmean uncertainty) from bivalves and brachiopods (combined under one symbol) and bulk rock from the two sections14. For comparison, micrite and bulk rock carbonate carbon isotope data from the Iberian (Spain14) and the Lusitanian Basin (Portugal14,18,55,56,57) are plotted. The shaded colored area represents the extent of the chemostratigraphically (negative CIE) defined T-OAE interval14,54. Lithological log of Spain modified after79 and for Portugal after80,81. Ammonite biostratigraphic zones for Submediterranean (Spain) and Mediterranean provinces (Portugal) are from82. Ages are given in million years (Ma) according to Geological Time Scale 201683.
