Fig. 2 in Middle Ordovician Drepanoistodus (Vertebrata, Conodonta) from Baltica, with description of three new species

Fig. 2. The Middle Ordovician stratigraphy of the St. Petersburg region with Baltoscandian and global stratigraphy for comparison (modified from Lindskog et al. 2020, and references therein; additions after Pärnaste et al. 2013; Bauert et al. 2014; Gradstein et al. 2020). The pink area indicates the approximate stratigraphic range of the outcrop at the Lynna River, with ranges of selected Drepanoistodus species indicated. For more detailed information on the local conodont biostratigraphy and ranges of individual species, see Lindskog et al. (2020: fig. 6).