Fig. 8 in Faunal dynamics across the Silurian-Devonian positive isotope excursions (δ C, δ O) in Podolia, Ukraine: Comparative analysis of the Ireviken and Klonk events

Fig. 8. Secular trends of δ13C and δ18O values in carbonate and organic matter, Δ13C and total organic carbon from section 64 near Dnistrove village (see SOM 3). Two slices S−1 to S−3 (marked by shades of grey) denote of the Silurian–Devonian transition carbon isotope excursion (SIDECIE): the interval S−3 corresponds to the isotopic highstand; S−2 to the increasing curve segment, and S−1 to the regional background. Lithology after Nikiforova et al. (1972: fig. 82), modified. Note that the Klonk biotic event (crossed band) is associated roughly with the final positive shift (S−2) and initial highstand (S−3) δ13C curve slices; its lower event boundary corresponds to a collapse of carbonate production and chitinozoan crisis near the base of Dnistrove Level, and the upper boundary is questionably placed below an acme level of brachiopod and conodont faunas (see Figs. 4 and 23).