Wijchen Bed

Code
NUBEWY
Status
Formal (Westerhoff & Weerts 2003; Busschers & Weerts 2003).
Lithological description

Typically stiff reddish brown to grey clay, silty, locally fine sandy. Humic, non-calcareous, especially at the organic-rich top, which may be marked by a palaeosol. A similar deposit is found at the top of the Kreftenheye Formation (Rhine).

Depositional setting

Floodplain of a transitional braided to meandering river (Meuse; Törnqvist et al. 1994; Makaske & Nap 1995; Busschers 2008; Autin 2008).

Definition of lower boundary

Commonly sharp contact with fluvial channel sand (Beegden Formation).

Definition of upper boundary

Partly exposed at the surface. Gradual transition into softer fluvial clay (Echteld Formation). Sharp contact with aeolian river-dune sand (Delwijnen Member, Boxtel Formation).

Thickness indication
0.2 - 2 m.
Geographical distribution
Directly along the Meuse river.
Regional correlation
UK: not present; GER: ?; BEL: not present.
Age
Late Pleistocene (Allerød/Late Weichselian) - early Holocene.
Type section
Well:
Not yet determined.
Depth (thickness) AH:
Not yet determined.
Origin of name
Named after the village of Wijchen, southeast of Utrecht, close to the German border.
Previous name(s)
Wijchen Member (Törnqvist et al. 1994).
Reviewed by (date)
Wim Dubelaar (2018), Sytze van Heteren (2019).
References
Autin, W.J. 2008. Stratigraphic analysis and paleoenvironmental implications of the Wijchen Member in the lower Rhine-Meuse Valley of the Netherlands. Netherlands Journal of Geosciences, 87 (4), 291-307.
Busschers, F.S. 2008. Unravelling the Rhine. Response of a fluvial system to climate change, sea-level oscillation and glaciation. PhD Thesis, Vrije Universiteit Amsterdam, 184 p.
Busschers, F.S., Weerts, H.J.T. 2003. Beschrijving lithostratigrafische eenheid. Nederlands Instituut voor Toegepaste Geowetenschappen TNO. Utrecht.
Makaske, B., NAP, R.L. 1995. A transition from a braided to a meandering channel facies, showing inclined heterolithic statification (Late Weichselian, central Netherlands). Geologie en Mijnbouw, 74, 1-8.
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.
Cite as
TNO-GDN ([YEAR]). Wijchen Bed. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from http://www.dinoloket.nl/en/stratigraphic-nomenclature/wijchen-bed.