Strijen Formation

Formal (Van Adrichem Boogaert & Kouwe 1995).
Lithological description

Predominantly reddish-brown, but also beige, grey or variegated, silty to very fine-grained sandy mudstones. Intercalated sandstone beds consist of sheets of 2 to 30 m thick. The sands are light, greenish to yellowish, grey or red, subangular to rounded, moderately- to well-sorted, fine- to coarse-grained. The mudstone intervals are between 10 and 70 m thick, averaging around 40 m. Carbonaceous particles are common in grey mudstone intervals, especially in the lower part. Coal seams are very rare to absent.

Depositional setting

Predominantly well-drained, distal fluvial-plain or flood-plain setting, with sheet floods and minor channelised fluvial systems.

Definition of lower boundary

Placed at the base of the first mudstone interval which is more than 60 m thick, overlying the uppermost massive sandstone bed of the Hellevoetsluis Formation. Where sediments are too fine-grained to be called Hellevoetsluis Formation, the Strijen Formation can (more or less conformably) rest on the Maurits Formation.

Definition of upper boundary

Truncated by the Saalian Unconformity. Formerly, the Carboniferous in most of the Campine Basin has been thought to be overlain directly by the Lower Germanic Trias Group.

Thickness indication
Up to 668 m.
Geographical distribution
Regional correlation
UK: Brig Formation; GER: ?; BEL: Strijen Formation.
Depth (thickness) AH:
2288 - 2957 m (669 m)
Depth (thickness) AH:
3409.5 - 3766 m (356.5 m)
Depth (thickness) AH:
1434 - 1689 m (225 m)
Origin of name
Named after the village of Strijen in the south of the province of Zuid-Holland, where the one of the first wells revealing this interval, is located.
Previous name(s)
Reviewed by (date)
Tom van Hoof (2017).
Van Adrichem Boogaert, H.A. & Kouwe, W.F.P. 1995. Stratigraphic nomenclature of The Netherlands, revision and update by RGD and NOGEPA, Section C, Silesian. Mededelingen Rijks Geologische Dienst, 50, 1-40.
Cite as
TNO-GDN ([YEAR]). Strijen Formation. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from