Delwijnen Member

Code
NUBXDE
Status
Formal (Schokker et al. 2005; Schokker et al. 2007).
Lithological description

Grey to brown fine to medium sand, moderately sorted, mostly non-calcareous but calcareous near base, sporadic silt layers or granule laminae.

Depositional setting

Periglacial aeolian (in floodplain next to dry river bed).

Definition of lower boundary

Sharp contact with fluvial sand (Kreftenheye Formation) and sandy silt (Wijchen Member, Kreftenheye Formation).

Definition of upper boundary

Locally exposed at the surface. Sharp contact with fluvial sand and clay (Echteld Formation) or peat (Basal Peat Bed, Nieuwkoop Formation).

Thickness indication
Up to about 20 m.
Geographical distribution
Clustered patches in the Rhine-Meuse floodplain of the western and central Netherlands.
Regional correlation
North Sea: not differentiated; UK: not present; GER: not present; BEL: part of Gent Formation, Wildert Member (in Scheldt floodplain) (Vernes et al. 2018).
Age
Late Pleistocene (Late Weichselian) - Greenlandian (early Holocene).
Type section
Well:
Not yet determined.
Depth (thickness) AH:
Not yet determined.
Origin of name
Named after the village of Delwijnen, south of Utrecht in the central Netherlands (Törnqvist et al. 1994).
Previous name(s)
Riverdune deposits formerly part of the Kreftenheye Formation (Doppert et al. 1975).
Reviewed by (date)
Wim Dubelaar (2018), Sytze van Heteren (2019).
References
Doppert, J.W.Chr., Ruegg, G.H.J., Van Staalduinen, C.J., Zagwijn, W.H., Zandstra, J.G. 1975. Formaties van het Kwartair en Boven-Tertiair in Nederland. In: Zagwijn, W.H., Van Staalduinen, C.J. (eds.): Toelichting bij geologische overzichtskaarten van Nederland. Rijks Geologische Dienst, Haarlem, 11-56.
Schokker, J, De Lang, F.D., Weerts, H.J.T., Den Otter, C., Passchier, S. 2005. Beschrijving lithostratigrafische eenheid. Nederlands Instituut voor Toegepaste Geowetenschappen TNO. Utrecht.
Schokker, J., Weerts, H.J.T., Westerhoff, W.E., Berendsen, H.J.A., Den Otter, C. 2007. Introduction of the Boxtel Formation and implications for the Quaternary lithostratigraphy of the Netherlands. Netherlands Journal of Geosciences / Geologie en Mijnbouw, 86, 197-210.
Törnqvist, T.E., Weerts, H.J.T., Berendsen, H.J.A. 1994. Definition of two new members in the upper Kreftenheye and Twente Formations (Quaternary, the Netherlands): a final solution to persistent confusion? Geologie en Mijnbouw, 72, 251-264.
Vernes, R.W., Deckers, J., Bakker, M.A.J., Bogemans, F., De Ceukelaire, M., Doornenbal, J.C., den Dulk, M., Dusar, M., Van Haren, T.F.M., Heyvaert, V.M.A., Kiden, P., Kruisselbrink, A.F., Lanckacker, T., Menkovic, A., Meyvis, B., Munsterman, D.K., Reindersma, R., ten Veen, J.H., van de Ven, T.J.M., Walstra, J., Witmans, N. 2018. Geologisch en hydrogeologisch 3D model van het Cenozoïcum van de Belgisch-Nederlandse grensstreek van Midden-Brabant / De Kempen (H3O – De Kempen). Studie uitgevoerd door VITO, TNO-Geologische Dienst Nederland en de Belgische Geologische Dienst in opdracht van Vlaams Planbureau voor Omgeving, Vlaamse Milieumaatschappij, TNO, Geologische Dienst Nederland, Nederlandse Provincie Noord-Brabant, Brabant Water, Programmabureau KRW/DHZ Maasregio.
Cite as
TNO-GDN ([YEAR]). Delwijnen Member. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from http://www.dinoloket.nl/en/stratigraphic-nomenclature/delwijnen-member.