Someren Member

The information on this page is a summary description.
The full formal description is available here: Someren Member

Abbreviation VdSo
Parent unit Veldhoven Formation
Child units
Lithological description Light grey to green fine to very fine glauconiferous mollusc-bearing sand is characteristic for the Someren Member.
Age No datation in Belgium is available. The age is Aquitanian to Burdigalian, based on datation in the Netherlands.
Thickness There is only one site in Belgium where the Someren Member has been positively identified in a borehole, at Molenbeersel, borehole Molenbeersel, designated as new Belgian parastratotype for the Veldhoven Formation. The Someren Member attains a thickness of 94 m in this well, for a total thickness of 295 m of the entire formation, according to Table 1 in Dusar & Vandenberghe, 2020 (cf. Matthijs et al., 2016).
Area of occurrence The upper unit or Someren Member is only known from the deepest parts of the Roer Valley Graben in Belgium and extends over adjoining tectonic blocks in The Netherlands.
Type locality Borehole Veldhoven-1 (NAM) in Veldhoven (NL), [TNO-GDN (2021), formation-nmve]. 860-935 m is the stratotype for the Veldhoven Formation. Parastratotype: Borehole Asten-1 (NAM) in Asten (NL), is also the stratotype for the Someren Sand Member (interval 867 – 952 m). Name derived from Someren, commune in Noord-Brabant, in proximity to location of the parastratotype borehole Asten-1. Additional Belgian parastratotype borehole Molenbeersel, drilled 1988 till final depth of 1773 m; GeoDoc 049W0226, ground level +33 m; Lambert coordinates x 247660, y 207752, Someren Member: 680 – 774 m from ground level.
Alternative names HCOVv2 hydrostratigraphic code (operated by VMM (2019)) for the Someren Member (named Voort zand 2): A0257.
Authors Dusar, M. & Vandenberghe, N.
Date 01/09/2023
Cite as Dusar, M. & Vandenberghe, N., 2023. The Someren Member, 01/09/2023. National Commission for Stratigraphy Belgium.
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