1. Akinin, V.V. and Miller, E. L., Evolution of calc-alkaline magmas of the Okhotsk-Chukotka volcanic belt, Petrology, 2011, vol. 19, pp. 237–277.
2. Akinin, V.V., Golovneva, L.B., and Shczepetov, S.V., Isotopic age of flora-bearing beds from the Amka Formation stratotype, Okhotsk–Chukotka volcanic belt, Paleobotany, 2016, vol. 7, pp. 38–46.
3. Akinin, V., Golovneva, L., Salnikova, E., Anisimova, I., Shczepetov, S., and Nosova, N., The composition and age of the Ul’ya flora (Okhotsk-ChukotkaVolcanic Belt, North-East of Russia): Paleobotanical and geochronological constraints, Acta Palaeobot., 2019, vol. 59, no. 2, pp. 251–276.
4. Anorov, P.N., Yudina, G.M., Zimenko, M.I., et al., Otchet o proizvodstve geologicheskogo doizucheniya masshtaba 1 : 200 000 na ploshchadi listov R-56-XXXI, XXXII; O-56-I, II (nov. ser.) (Report on the 1 : 200 000 Geological Additional Site Appraisal of Sheets of R-56-XXXI, XXXII; O-56-I, II (New Ser.)), Magadan: Fondy FGUP “Magadangeologiya,” 2001 [in Russian].
5. Bakharev, A.G., Stratigraphy and compositional features of volcanogenic formations of the Ul’ya superimposed depression, in Vulkanicheskie i intruzivnye formatsii Priokhot’ya (Volcanic and Intrusive Formations of the Cis-Okhotsk Region), Novosibirsk: Nauka, 1976, pp. 53–76.