Code
NUBRAA
Status
Formal (Van den Bosch et al. 1975).
Lithological description
Brownish grey to black clay, very silty to sandy, calcareous. Brownish grey to black sand, shelly and glauconitic.
Depositional setting
Warm delta base, delta front (Van den Berg et al. 2000).
Definition of lower boundary
Unconformable contact (Mid-Miocene Unconformity) with shallow-marine clay and sand (Rupel Formation and locally Veldhoven Formation).
Definition of upper boundary
Gradual transition into non-calcareous and micaceous shallow-marine clay and sand (Eibergen Member, Breda Formation).
Thickness indication
Up to about 20 m.
Geographical distribution
Restricted to the eastern Netherlands, close to the German border (Van den Bosch et al. 1975).
Regional correlation
North Sea: not present; UK: not present; GER: ?; BEL: not present.
Age
middle Miocene.
Type section
Well:
Not yet determined.
Depth (thickness) AH:
Not yet determined.
Origin of name
Named after the village of Aalten in the eastern Netherlands.
Previous name(s)
Aalten Deposits. Subdivided into the Miste Bed and the Stemerdink Bed (Van den Bosch et al. 1975).
Reviewed by (date)
Dirk Munsterman (2018), Sytze van Heteren (2019).
References
Van den Bosch, M., Cadée, M.C., Janssen, A.W. 1975. Lithostratigraphical and biostratigraphical subdivision of Tertiary deposits (Oligocene-Pliocene) in the Winterswijk-Almelo region (eastern part of The Netherlands). Scripta Geologica 29, 1-167.
Van den Berg, M.W., Van Houten, C.J., Den Otter, C. 2000. Toelichting bij de Geologische Kaart van Nederland 1 : 50 000, 34W, 34O/35.
Cite as
TNO-GDN ([YEAR]). Aalten Member. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from https://www.dinoloket.nl/en/stratigraphic-nomenclature/aalten-member.