Formal (Van Adrichem Boogaert & Kouwe 1997). Amended, name change (2018).
Grey to greenish grey clays, locally with brownish colours. Becomes more silty and sandy towards the top. Most typically developed in the Roer Valley Graben. On the Peel and Venlo Blocks it is only a thin clay layer between the Voort and Someren members.
Inner-neritic marine environment. Intervals with high abundance of agglutinated species may have been deposited in deeper water.
Definition of lower boundary
Conformably or mildly unconformably overlies the Voort Member in its southern area of distribution. Where the Voort Member is absent, the Wintelre Member can be distinguished from the underlying Boom Member by the higher silt content in the upper part of latter, expressed on the gamma-ray log by a lower reading. Furthermore, the Boom Member shows a typical brownish colour, whereas the Wintelre Member exhibits greenish-grey aspects.
Definition of upper boundary
Overlain conformably by the Someren Member in the Roer Valley Graben and on the Peel and the Venlo Blocks. Elsewhere it is unconformably overlain by the Breda Formation.
UK: Lark Formation; GER: -; BEL: Veldhoven Member of the Voort Formation Marechal & Laga (1988).
Lower part: late Oligocene (Chattian). In the additional reference well Broekhuizenvorst the age is early Miocene (late Acquitanian - early Burdigalian).
Origin of name
Named after the village of Wintelre.
Veldhoven Clay Member (Van Adrichem Boogaert & Kouwe 1997). The name was changed because Veldhoven was already in use as formation name. Furthermore, the aim is to avoid lithology in lithostratigraphic names (e.g. 'clay').
Maréchal, R., Laga, P. (eds.) 1988. Voorstel lithostratigrafische indeling van het Paleogeen - Nationale Commissies voor Stratigrafie. Commissie: Tertiair, Belgische Geologische Dienst, Brussel, 208 p.
Van Adrichem Boogaert, H.A. & Kouwe, W.F.P. 1997. Stratigraphic nomenclature of The Netherlands, revision and update by RGD and NOGEPA, Section I, Tertiary. Mededelingen Rijks Geologische Dienst, 50, 1-39.
TNO-GDN ([YEAR]). Wintelre Member. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from https://www.dinoloket.nl/en/stratigraphic-nomenclature/wintelre-member.