Grey to brown very fine to very coarse sand, locally gravelly. Dark grey to dark brown laminated clay (stiff, silty, calcareous), locally glauconitic, shelly, layered with silty fine to medium sand, with dropstones. Peripheral coarse sand.
Glaciolacustrine, with accumulation of suspended sediment in tongue basins partly flanked by steep ice-pushed ridges (source of coarse sand deposited by mass flow caused by slumping; De Gans et al. 1987, 2000).
Generally sharp contact with mostly gravelly fluvial sand.
Sharp contact with coarse fluvial sand (Kreftenheye Formation), gradual transition into fine to medium marine clay (Eem Formation) or fluviolacustrine clay (Kreftenheye Formation).