This complex of carbonatites and fenites covers 15 km2, is poorly exposed, and is the only known Mesozoic carbonatite in Greenland. It comprises a number of ring dykes of carbonatite enclosing and surrounded by fenitized Precambrian granitic and granodioritic gneisses. The ring dyke carbonatites are principally sovites with locally small areas of dolomitic and rare earth carbonate rocks. They contain a little dark mica, magnetite, apatite, aegirine, alkali amphibole and pyrochlore. Silicocarbonatites and ultramafic rocks with dominant and variable phlogopite, alkali amphiboles and olivine are also present. Late carbonatite dykes are beforsites of dolomite and ankerite and these grade locally into breccias. The fenites involve the replacement of quartz, mainly by albite, aegirine and alkali amphiboles; fenite blocks in carbonatite have mica-rich rims. Late lamprophyric dykes with large phlogopites are also associated with the complex (Knudsen, in press a).