Fig. 3: Geochemical results compared to published biodiversity data.
From: Stable ocean redox during the main phase of the Great Ordovician Biodiversification Event
Stratigraphy and geochemical data (δ238U, δ13C, U/Ca) across the Kinnekulle-1 drillcore (N 58°35.97792′, E 13°25.00083′). Conodont biostratigraphy after ref. 56. and references therein. Stage-level marine animal biodiversity (black, gray curves) and brachiopod richness (blue curve) after refs. 9,10,57. Horizontal lines represent the middle point of time bins to which biodiversity curves were calculated9,10. Stage slices sensu ref. 46. Modern seawater δ238U ~ –0.39‰40, modern carbonates δ238UCARB ~ –0.14‰34. Intervals I and II are shown next to the δ238U data. The dashed black line in the stratigraphic column marks the unconformity of the section. The blue curve corresponds to the spline interpolation of the δ238U data points. Error bars for δ238U represent analytical precision (2 s.e). NB! The U/Ca data is shown on a log-scale to emphasize the details. Dp: Dapingian, Dw: Darriwilian, 1: Dp1, L: Lasnamägi, S: Skövde Limestone, B.: B. triangularis, B. norrl.: Baltoniodus norrlandicus, L.a.: L. antivariabilis, Y. cr.: Y. crassus, P. anserinus.: Pygodus anserinus.
