A profile through the boundary between the Neoproterozoic Smalfjord (glacial; sensu-lato) and Nyborg (post-glacial) Formations at Hammarnes,
East Finnmark, shows lithologies of the two units are intercalated, with rocks diagnostic of the Nyborg Formation ( cap-dolostones, red shales)
underlying Smalfjord-type clastic sediments (conglomerates, dark grey shales, pale grey sandstones). Since these latter rocks are almost certainly
post-glacial, identical rocks underlying the lowest Nyborg-type lithologies must also be post-glacial. Thus the base of the Nyborg Formation
cannot be unequivocally taken as the onset of post-glacial sedimentation; a small, but unknown amount of the Smalfjord Formation is probably
also of post -glacial age, reflecting localized rework.ing of older, glacial sediments.