Pickerill, R.K, and J.S Peel. “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 July 3, 2024. https://geusjournals.org/index.php/rapggu/article/view/8136.