The Eocambrian Lower and Upper Tillite Formations, and associated sediments, are described from the Tanafjord area, Finnmark, northern Norway. Four main facies and several sub-facies have been recognised: tillites (poorly and well stratified), turbidites (distal and proximal), mudstones (black, green, purple and grey, with ripple-drift sandstone layers, unidirectional isolated ripples, “linsen- und flaserschichten”, and silty streaks) and sandstones (regularly bedded, cross-stratified and herringbone cross-stratified, and in places deformed into ball-and-pillow layers).Interpretation of the processes, environments and control of sedimentation is based upon the lateral and vertical facies relationships, and upon a new classification of glacial deposits. It is concluded that the Lower and Upper Tillite Formations are glacio-marine over most of the Tanafjord area, and two models of glacial marine sedimentation are suggested. The other facies represent environments ranging from a quiet marine basin to sub-tidal, tidal and possibly fluvial conditions.Interpretation of the facies relationships has also indicated the relative importance of basin subsidence, eustatic changes of sea-level and isostatic movements of the land at different times during basin evolution.