“…In most cases, the curves reconstructed from rocks broadly follow the brachiopod values (Balaban, 2007;Cramer, Kleffner, et al, 2010;Kaljo et al, 2001). In the present study, we used the more continuous mudstone samples for the analysis instead of brachiopods, under the assumtion that these According to the Palaeozoic δ 13 C and δ 18 O curves recorded from different palaeocontinents (Azmy et al, 1999;Cramer, Loydell, et al, 2010;Cramer, Kleffner, et al, 2010;Lehnert et al, 2007;Lehnert, Männik, Joachimski, Calner, & Frýda, 2010;Žigaitė et al, 2010), three (Ruban, 2013). The global change since the early Telychian stage was associated with biotic extinction events, including conodonts, graptolites, and trilobitesp (Kaljo et al, 2001;Loydell, 2007;Ruban, 2013;.…”