“Gordia Nodosa Isp Nov and Other Trace Fossils from the Cass Fjord Formation (Cambrian) of North Greenland”. Rapport Grønlands Geologiske Undersøgelse 150 (January 1, 1991): 15–28. Accessed October 23, 2025. https://geusjournals.org/index.php/rapggu/article/view/8136.