Cruciplacolithus cf. hayi Black, 1973
Black, M. 1973. British Lower Cretaceous Coccoliths. I-Gault Clay (Part 2). Palaeontographical Society Monograph 127: 49-112.
Jakubowski, M., 1986. New calcareous nannofossil taxa from the Lower Cretaceous of the North Sea. INA Newsletter. 8, 38-42.