Loose blocks of nepheline syenite occur at Nagtivit in the mouth of Sermilik Fjord, Angmagssalik district. They are presumed to originate from a hitherto undiscovered intrusion high up the Fjord.
GLEADOW, A.J.W. and BROOKS, C.K. 1979. Fission track dating, thermal histories and tectonics of igneous intrusions in East Greenland. Contributions to Mineralogy and Petrology, 71: 45-60.