Bowman et al., 2012
From dinoflaj3
Bowman, V.C., Francis, J.E., Riding, J.B., Hunter, S.J. and Haywood, A.M., 2012: A latest Cretaceous to earliest Paleogene dinoflagellate cyst zonation from Antarctica, and implications for phytoprovincialism in the high southern latitudes. Review of Palaeobotany and Palynology, v.171, p.40-56, pl.1-2.