Someren Member

Code
NMVESO
Status
Formal (Van Adrichem Boogaert & Kouwe 1997).
Lithological description

Clayey sands grading upwards into very fine-grained sands. The colour of the sand is greenish-grey and the glauconite content is low. Marine shells occur locally. Can only be easily recognised in the Roer Valley Graben. Represents the sandy upper part of the Veldhoven Formation.

Depositional setting

Inner-neritic marine environment.

Definition of lower boundary

Conformably overlies the Wintelre Member. The transition is gradual. On the Peel Block and the Venlo Block, the Veldhoven Formation consists mainly of sands with only a very thin Wintelre Member. There, the Someren Member can only be identified with the help of biostratigraphical data.

Definition of upper boundary

Unconformably overlain by the Breda Formation, except possibly in the Roer Valley Graben. In the graben the upper boundary is marked by a change in pattern of SP-log readings, from rather gradually decreasing values below the boundary, to medium- to high-amplitude variations above it. On the Venlo and Peel Blocks, the transition is expressed on the gamma-ray log as an overall change towards lower readings. The lowermost few metres of the Breda Formation, however, have relatively high gamma-ray readings because of their high glauconite content.

Thickness indication
Up to ~100 m.
Geographical distribution
Regional correlation
UK: ?; GER: ?; BEL: ?
Age
early Miocene (Burdigalian).
Holostratotype
Depth (thickness) AH:
867 - 952 m (85 m)
Parastratotype
Depth (thickness) AH:
860 - 935 m (75 m)
Parastratotype
Depth (thickness) AH:
223 - 244 m (21 m)
Origin of name
Named after the village of Someren.
Previous name(s)
None.
Reviewed by (date)
Dirk Munsterman (2018).
References
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.
Cite as
TNO-GDN ([YEAR]). Someren Member. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from http://www.dinoloket.nl/en/stratigraphic-nomenclature/someren-member.