Pickerill, R. and Peel, J. 1991. Gordia nodosa isp nov and other trace fossils from the Cass Fjord Formation (Cambrian) of North Greenland. Rapport Grønlands Geologiske Undersøgelse. 150, (Jan. 1991), 15–28. DOI:https://doi.org/10.34194/rapggu.v150.8136.