Fine- to medium-grained sandstone (occasionally up to coarse sand and gravel), well to poorly sorted. Carbonate cement, glauconite and lignite are common. Sandstones predominantly show fining but locally coarsening upward trends.
Barrier island complex, including shoreface to foreshore and washover fans environments.
Conformable basal contact with the Oyster Ground Member is characterised by a sharp downhole change to finer-grained deposits (base of the sandstone bed), the appearance of restricted-marine (lagoonal) fossils, a change towards higher GR log readings and a more serrated sonic log pattern. In the type section well L06-02, the member unconformably rests on the Altena Group. In the deepest part of the Terschelling Basin, in well L03-01, interfingering occurs with the Oyster Ground Member.
Conformably overlain by the shallow marine calcareous claystones of the Lies Member. The top of the Terschelling Sandstone Member is diachronous.
