Fine- to very fine-grained, argillaceous sandstones with intense bioturbation. Sands are often slightly calcareous, glauconitic, with thin streaks of lignite. Cores show some intercalations of up to coarse, glauconitic and sometimes argillaceous sandstone.
Shoreface to offshore setting.
Mild unconformity with underlying Scruff Spiculite Member or undifferentiated Scruff Greensand Formation in the Terschelling Basin. The boundary is placed at the discontinuity (consistent basal peak) of the GR-log. In the case of a contact with the Scruff Spiculite Member, a downhole increase in the sponge spiculae content may be taken as an additional criterion. In the southern Central Graben the base may be unconformably underlain by the Skylge or Friese Front formations.
Conformably overlain by the Schill Grund Member (Lutine Formation). In the southern Dutch Central Graben an unconformable upper contact with the Vlieland Claystone Formation (Rijnland Group) may be possible locally.
