The Tartoq Group on Nuna qaqertoq and in the Iterdlak area, South-West Greenland

The Tartoq Group schists of Nuna qaqertoq appear to have comprised pillow lavas, sills and sediments. Those of the Iterdlak area appear to have been composed of sills and a variety of sedimentary rocks, including a conglomerate. Both areas of schists have suffered deformation and metamorphism under high greenschist facies conditions, and have in part been extensively veined by pegmatite or aplite. Comparisons of the structures in these schists with those in the gneisses of adjacent areas supports the view that these gneisses represent the gneissified, deformed basement on which the Tartoq Group was deposited.