Stramproy Formation

Formal (De Lang & Weerts 2003).
Lithological description

Pale brown to greyish white very fine to medium sand, bleached, quartz-rich, stable heavy-mineral association, commonly non-calcareous. Grey to brownish grey loam beds and greenish grey to brown clay beds. Local peat horizons and layers of fine gravel.

Depositional setting

Small-scale fluvial (rivers draining northern Belgium), fluvio-aeolian (periglacial), local colluvial, estuarine (Westerhoff 2008) and shallow marine.

Definition of lower boundary

Sharp contact with fluvial clay (Waalre Formation), gradual transition into fluvial sand (Kieseloolite Formation).

Definition of upper boundary

Sharp contact with coarser fluvial sand (Sterksel, Urk and Kreftenheye Formations). Gradual to diffuse transition into younger aeolian and local river sand (Boxtel Formation).

Thickness indication
Up to about 100 m.
Geographical distribution
Regional correlation
North Sea: not distinguished; UK: not present; GER: Hauptterrassen; BEL: Beerse Member of the Weelde Formation (former Kempen Complex; Wouters & Vandenberghe 1994), part of the Ravels Formation and Mol Formation (Maatheide Member), sandy part of the Jagersborg Member (Kieseloolite Formation).
early Pleistocene - Middle Pleistocene (Tiglian - early Cromerian).
Depth (thickness) AH:
46.30 - 136.80 m (90.5 m) below land surface
Origin of name
Named after the village of Stramproy in the southeastern Netherlands.
Previous name(s)
Part of the Kedichem Formation that was not deposited by Rhine and Meuse (Doppert et al. 1975).
Reviewed by (date)
Wim Dubelaar (2018), Sytze van Heteren (2019).
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.
De Lang, F.D. Weerts, H.J.T. 2003. Beschrijving lithostratigrafische eenheid. Nederlands Instituut voor Toegepaste Geowetenschappen TNO. Utrecht.
Westerhoff, W.E. 2009. Stratigraphy and sedimentary evolution. The lower Rhine-Meuse system during the Late Pliocene and Early Pleistocene (Southern North Sea Basin). PhD Thesis Vrije Universiteit Amsterdam. In: Geology of the Netherlands 2. TNO - Geological Survey of the Netherlands, 168 p.
Wouters, L., Vandenberghe, N. 1994. De Geologie van de Kempen: een synthese. NIRAS, NIROND 94-11, 208 p.
Cite as
TNO-GDN ([YEAR]). Stramproy Formation. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from