Delden Member

Formal (Van den Bosch et al. 1975).
Lithological description

Dark greenish grey to brown loam, very sandy, and clay, very silty. Glauconite, goethite and phosphorite concretions.

Depositional setting

Warm shallow marine near-coastal (Van den Bosch et al. 1975; Van den Berg & Den Otter 1993).

Definition of lower boundary

Unconformable contact with coarser units of the Breda Formation such as the Zenderen Member.

Definition of upper boundary

Unconformable contact with coarse and shelly marine sand (Oosterhout Formation).

Thickness indication
Up to about 50 m palaeovalley setting, up to 15 m elsewhere (Van den Berg & Den Otter 1993).
Geographical distribution
Restricted to the eastern Netherlands, close to the German border.
Regional correlation
North Sea: not present; UK: not present; GER: ?; BEL: not present.
late Miocene.
Type section
Not yet determined.
Depth (thickness) AH:
Not yet determined.
Origin of name
Named after the city of Delden, in the eastern Netherlands.
Previous name(s)
Reviewed by (date)
Dirk Munsterman (2018), Sytze van Heteren (2019).
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., Den Otter, C. (eds.) 1993. Toelichtingen bij de Geologische kaart van Nederland 1: 50.000. Blad Almelo Oost/Denekamp (28O/29), Rijks Geologische Dienst, Haarlem.
Cite as
TNO-GDN ([YEAR]). Delden Member. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from