Strijen Formation DCHS

 

Premise Unit, defined by Van Adrichem Boogaert and Kouwe (1995).
Derivatio nominis 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.
Type section Location map See figure (pdf)
  Well Hellevoetsluis-1 (pdf)
  Location N 51°51’28.3
E 04°10’20.2
  Depth 2288 to 2957 m
  Length 669 m along hole
Additional section Location map See figure (pdf)
  Well De Lier-45 (pdf)
  Location N 51°59’06.9
E 04°13’33.1
  Depth 3409.5 to 3766 m
  Length 356.5 m along hole
  Well Rijsbergen-1 (pdf)
  Location N 51°31’44.3
E 04°41’21.6
  Depth 1434 to 1689 m
  Length 255 m along hole
Definition Succession of 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.
Upper Boundary The top of the formation is 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. Recent investigations revealed the widespread presence of a red-bed interval of Upper Rotliegend sandstones and Zechstein claystones beneath the Triassic in the Campine Basin (Geluk (1993) ., in press; this publication, sections D and E). Previously, these intervals had been interpreted as ‘Barren Measures’ of the Limburg Group (e.g. wells Rijsbergen-1 (see pdf) , Werkendam-2, P13-01).
Lower Boundary The base of the Strijen Formation has been 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 the Upper Westphalian C is too fine-grained to be called Hellevoetsluis Formation, the Strijen Formation can (more or less conformably) rest on the Maurits Formation. That unit is characterised by grey mudstones with abundant coal seams.
Correlation The Brig Formation is the lateral equivalent in the southern UK offshore. As a consequence of the diachronous character of the bounding surface with the Hellevoetsluis Formation, the latter is a lateral equivalent along the eastern margin of the Campine Basin (Maasbommel High). The Kemperkoul Member of the Maurits Formation is age-equivalent to the older intervals of the Strijen Formation in the southeastern Campine Basin. The Neeroeteren Formation appears to be a sandstone-dominated equivalent of the younger Strijen Formation in the same area. The transitions of the Kemperkoul Member and the Neeroeteren Formation into the Strijen Formation have not yet been discovered. Analogy with the Tubbergen and De Lutte Formation in the Ems Low area suggests that these transitions are probably gradual and fault-controlled.
Distribution Western and central part of the Campine Basin. The formation is developed thicker along the northern flank of the London-Brabant Massif.
Age Late Westphalian C to Westphalian D and Stephanian(?) van Wijhe (1974) . Difficult to date palynologically because of its predominantly barren, oxidised character.
Depositional Setting Deposited in a predominantly well-drained, distal fluvial-plain or flood-plain setting, with sheet floods and minor channelised fluvial systems. Carbonaceous matter, very rare coal seams, ferruginous soil profiles, (oxidised) plant remains and bioturbation reflect periods of poorly-drained soil conditions in the oldest part of the formation.
References See References Upper Carboniferous

Van Adrichem Boogaert, H.A. & Kouwe, W.F.P., 1993-1997. [Stratigraphic unit]. In: Stratigraphic Nomenclature of the Netherlands.
Retrieved [Datum] from [url].