Schiøler, Poul, Jan Andsbjerg, Ole R. Clausen, Gregers Dam, Karen Dybkjær, Lars Hamberg, Claus Heilmann-Clausen, Erik P. Johannessen, Lars E. Kristensen, Iain Prince, and Jan A. Rasmussen. “Lithostratigraphy of the Palaeogene – Lower Neogene Succession of the Danish North Sea”. GEUS Bulletin 12 (June 29, 2007): 1–77. Accessed November 30, 2021. https://geusbulletin.org/index.php/geusb/article/view/5249.