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: Westray Group, the Lark Formation”. GEUS Bulletin 12 (June 29, 2007): 63–73. Accessed November 22, 2024. https://geusbulletin.org/index.php/geusb/article/view/4937.