Fine to very coarse sand, gravelly. Greyish blue to brownish grey fine sand, gravelly (up to boulder size) and poorly sorted, very silty, slightly calcareous. Greyish blue to brownish grey clay and loam, very sandy to very silty, gravelly. Dark grey to dark brown silty clay, stiff, laminated.
Glacial, including subglacial (till; diamict), fluvioglacial (sandur, kame and esker; sand), and glaciolacustrine (varved clay). Crystalline gravel originates from Scandinavian bedrock.
Typically sharp and unconformable. Diffuse where coarse gravelly sand overlies older fluvial units.
In the northern Netherlands, till locally exposed at the surface. Generally, sharp contact with aeolian and local river sand (Boxtel Formation). Diffuse where coarse gravelly sand underlies younger fluvial units (Kreftenheye Formation).
