Maastrichtian-Danian chalks of well 1/6-3 (Albuskjell structure, North Sea) contain large-scale allochthonous chalk units that were emplaced by slumping, debris flows, turbidity flows, and other bottom-traction processes in a slope and a base-of-slope environment. The triggering mechanisms for allochthonous deposition are thought to have been gravitational instability and/or seismic shocks caused by small-scale movement along faults of the North Sea Central graben system, with possible local influence of halokinesis. Implications of this allochthonous deposition on existing theories of North Sea chalk formation are presented, with special reference to nearby Ekofisk chalks.

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