1. G. N. Rodzyanko, in The Neogene System, Ed. by M. V. Muratov and L. A. Nevesskaya (Nedra, Moscow, 1986), semivol. Vol. 1, pp. 268–287 [in Russian].
2. V. P. Kolesnikov, in Stratigraphy of the USSR, Vol. 12: The Neogene of the USSR, Ed. by A. D. Arkhangel’skii (USSR Acad. Sci., Moscow, Leningrad, 1940), pp. 253–256 [in Russian].
3. N. A. Sokolov, Izv. Geol. Kom. 10 (2), 1–23 (1891).
4. Yu. O. Gavrilov, E. V. Shchepetova, E. A. Shcherbinina, et al., Lithol. Miner. Resour. 52 (6), 447–467 (2017).
5. P. D. Frolov, G. A. Danukalova, and E. M. Osipova, Palaeontol. Electron. 23 (1), a20 (2020). https://doi.org/10.26879/936