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Kashpir section is one of the most well-studied sections in Subboreal Realm. Even if it is highly condensed, it contains a number of potential direct markers (ammonites, belemnites, buchiids and dinocysts; palaeomagnetic reversal and stable isotope data), which could be used for interregional correlation of J/K boundary interval (Figs. 1, 2). Unfortunately only stable isotopes and palaeomagnetic reversals one may use for the direct Boreal–Tethyan correlation of the both Tithonian / Volgian and Berriasian / Ryazanian. It needs additional study. Nevertheless, Kashpir section could be proposed as auxiliary section in Subboreal Realm to the GSSP, which hopefully will be chosen in the future.