Fluvial (Eridanos, Baltic River System), shallow-marine (delta front; very fine to fine sand at base), coastal and river plain (delta top; sand with clay layers).
Commonly marked by clay layers (Balk Member). Sharp contact with glauconitic, commonly shelly, shallow-marine fine sand (Breda Formation). Gradual transition (where base is fine) into or sharp contact with finer and more calcareous shallow-marine sand (Oosterhout and Maassluis Formations). Gradual transition into non-calcareous, micaceous and brown fluvial sand and clay (Waalre Formation).
Locally marked by a unit with cobbles (Hattem Layers, cf. Zandstra 1971). Commonly, gradual transition into multi-coloured, calcareous fluvial sand and gravel (a.o. lydite and milky quartz; Appelscha, Sterksel and Urk Formations), or into fluvial sand and clay (Waalre Formation).