Figure 1
From: Bioindicators of severe ocean acidification are absent from the end-Permian mass extinction
Stratigraphic succession of the Permian–Triassic transition at Lusitaniadalen, Svalbard. Inset shows the location of the studied section (marked by the star). The samples that yielded fossils are shown with the main fossil groups and their shell mineralogy. The two hypothesised ocean acidification intervals being tested in this study are shown to the left of the stratigraphic log. The position of the Permian/Triassic boundary is based on the occurrence of H. parvus in the nearby Deltadalen section following Zuchuat et al.26. KS = Kapp Starostin Formation. Note: 0 m marks the base of the Vikinghøgda Formation and the extinction horizon is inferred from the disappearance of intense bioturbation, following Nabbefeld et al.27.The inset map is a sketch map based on https://toposvalbard.npolar.no/.
