Paschenyi et al., 1992
From dinoflaj3
Paschenyi, G.V., Bogdanovich, V.V., Kulish, L.I. and Orlovskii, G.N., 1992: Stratigrafiya i litologiya rudonosnoii i podstilayushchiknee tolshch Oligotsena nikopolskogo Margantsevorudnogo Basseina. Geologicheskii Zhurnal, no.6, p.66-76.