Code
SLD
Status
Formal (NAM & RGD 1980). Ammended (Herngreen & Wong 1989; Van Adrichem Boogaert & Kouwe 1993).
Lithological description
Sequence of rapidly alternating paralic sands and shales, with some coal beds and with common lignitic matter. Towards the basin centre there is a major intercalation of marine clays (NAM and RGD 1980).
Depositional setting
Proximal marine.
Definition of lower boundary
In type area unconformable over the Altena Group. Conformably upon the Niedersachsen Group in Central Netherlands and Vlieland Basins (NAM and RGD 1980).
Definition of upper boundary
Unconformably followed by the Rijnland Group (NAM and RGD 1980).
Thickness indication
Up to 850 m.
Geographical distribution
Regional correlation
UK: Humber Group; GER: ?; BEL: -.
Age
Kimmeridgian - Berriasian.
Holostratotype
Depth (thickness) AH:
1052 - 1942 m (890 m)
Hypostratotype
Well:
Depth (thickness) AH:
1559 - 2270 m (711 m)
Origin of name
Named after the polder authority of Delfland in the province of Zuid Holland.
Previous name(s)
None.
Reviewed by (date)
Sander Houben (2017).
References
NAM & RGD 1980. Stratigraphic nomenclature of The Netherlands. Verhandelingen van het Koninklijk Nederlands Geologisch Mijnbouwkundig Genootschap 32, 77 p.
Herngreen, G.F.W. and Wong, Th.E. 1989. Revision of the ’Late Jurassic’ stratigraphy of the Dutch Central North Sea Graben - Geol. en Mijnbouw, 68, p. 73-105.
Van Adrichem Boogaert, H.A. & Kouwe, W.F.P. 1993. Stratigraphic nomenclature of The Netherlands; revision and update by RGD and NOGEPA, Section G, Upper Jurassic and Lower Cretaceous. Mededelingen Rijks Geologische Dienst, 50, 1-80..
Cite as
TNO-GDN ([YEAR]). Delfland Subgroup. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from https://www.dinoloket.nl/en/stratigraphic-nomenclature/delfland-subgroup.