Uitdam Member

Formal (Bakker et al. 2003).
Lithological description

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.

Depositional setting

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).

Definition of lower boundary

Generally sharp contact with mostly gravelly fluvial sand.

Definition of upper boundary

Sharp contact with coarse fluvial sand (Kreftenheye Formation), gradual transition into fine to medium marine clay (Eem Formation) or fluviolacustrine clay (Kreftenheye Formation).

Thickness indication
Up to about 60 m in tongue basins, up to 5 m elsewhere.
Geographical distribution
Central Netherlands and locally offshore.
Regional correlation
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).
B25F0154 (Uitdam)
Depth (thickness) AH:
51.0 - 111.2 m (60.2 m) below land surface
Origin of name
Named after the village of Uitdam, northeast of Amsterdam.
Previous name(s)
Cleaver Bank Formation.
Reviewed by (date)
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.
Cite as
TNO-GDN ([YEAR]). Uitdam Member. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from https://www.dinoloket.nl/en/stratigraphic-nomenclature/uitdam-member.