Uitdam Member

NUDRUI

Formal (Bakker et al. 2003).

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).

Up to about 60 m in tongue basins, up to 5 m elsewhere.

Central Netherlands and locally offshore.

North Sea: Cleaver Bank Formation (defined and mapped in conjunction with the British Geological Survey; Laban 1995); UK: part of Wolston Glacigenic Formation (McMillan et al. 2011); GER?; BEL: not present.

late Middle Pleistocene (Late Saalian).

Named after the village of Uitdam, northeast of Amsterdam.

Cleaver Bank Formation.

Wim Dubelaar (2018), Sytze van Heteren (2019).

Bakker, M.A.J., Den Otter, C. Weerts, H.J.T. 2003. Beschrijving lithostratigrafische eenheid. Nederlands Instituut voor Toegepaste Geowetenschappen TNO. Utrecht.

De Gans, W., Beets, D.J., Centineo, M.C. 2000. Late Saalian and Eemian deposits in the Amsterdam glacial basin. In: Van Kolfschoten, Th., Gibbard, P.L. (eds.): The Eemian – local sequences, global perspectives. Geologie en Mijnbouw / Netherlands Journal of Geosciences, 79, 147-160.

De Gans, W., De Groot, Th., Zwaan, H. 1987. The Amsterdam basin, a case study of a glacial basin in The Netherlands. In: Van der Meer, J.J.M. (ed.): Tills and Glaciotectonics, 205-216.

Laban, C. 1995. The Pleistocene glaciations in the Dutch sector of the North Sea. A synthesis of sedimentary and seismic data. PhD Thesis, University of Amsterdam, 194 p.

McMillan, A.A., Hamblin, R.J.O., Merritt, J.W. 2011. A lithostratigraphical framework for onshore Quaternary and Neogene (Tertiary) superficial deposits of Great Britain and the Isle of Man. British Geological Survey Research Report, RR/10/03, 343 p.