The Greenland part of the Franklinian Basin was mapped systematically by the Geological Survey of Greenland in the period 1978–85. Throughout the Early Palaeozoic, the basin was divided into a southern shelf and slope and a northern deep-water trough. The shelf succession dominated by carbonates reaches 4 km in thickness whereas the trough deposits that are dominately siliciclastic rocks have a composite thickness of c. 8 km. The boundary between shelf and trough facies shifted position with time and southerly basin expansion in the Silurian resulted in a final foundering of the shelf. This facies border, the so-called Navarana Fjord Escarpment, was a dominant E–W palaeo-topographic feature with a relief of over 1 km. Stream-sediment zinc anomalies are associated with this structure. Sedimentation was brought to an end by the late Devonian – early Carboniferous Ellesmerian orogeny. The resulting orogenic belt is characterised by E–W- to NE–SW-trending folds, with deformational effects most intense in the north, and broadly parallel to the main facies boundaries within the basin.