Fig. 1
From: Enhanced flux of extraterrestrial 3He across the Permian–Triassic boundary
Lithology and geochemical profiles of the study section. Stratigraphic column showing samples, lithologies, total organic carbon contents (TOC, wt.%), and organic carbon isotopic values (δ13Corg, VPDB‰, divided into carbon isotope zones, CIZ). Modified after Sano et al. (2012a)