Sheldon, Emma, Caterina Morigi, and Sarah D. Møller. “Calcareous Nannofossil and Foraminifer Biostratigraphy of the Campanian–Maastrichtian Chalk of the Femern Bælt (Denmark–Germany)”. GEUS Bulletin 31 (June 25, 2014): 31–34. Accessed December 9, 2021. https://geusbulletin.org/index.php/geusb/article/view/4647.