Figure 2. Geochemical records of oceanic anoxic event (OAE) 1b sediments from Deep Sea Drilling Project (DSDP) Site 545 (see Fig. 1A): stable carbon isotopes of bulk carbonate (¹³ C_carb) and organic carbon (OC) (¹³ C_org), content of total OC (TOC) and carbonate (CaCO₃), compound-specific stable carbon isotope data from marine C₂₇-sterenes and averaged terrestrial long-chain C₂₇, C₂₉, C₃₁ n-alkanes, and TEX₈₆-based estimates of sea surface temperature (SST). TEX₈₆-SST data are presented for Ocean Drilling Program (ODP) Site 1049 at Blake Nose. Stratigraphic position of OAE 1b (light gray shading) is based on biostratigraphy (Leckie, 1984; Herrle et al., 2004) combined with ¹³ C_carb (Herrle et al., 2004), in agreement with sections from the Vocontian Basin (Herrle et al., 2003) and ODP Site 1049 (Erbacher et al., 2001). Gray shaded interval indicates depth interval representing OAE 1B.