Janssen , N.M.M., M.A. Rogov, and V.A. Zakharov. 2022. “Ryazanian (Berriasian) Molluscs and Biostratigraphy of the Dutch and Norwegian North Sea Area (south of Viking Graben)”. Netherlands Journal of Geosciences 101 (April). https://doi.org/10.1017/njg.2022.5.