Code
ORPA
Status
Formal (Van Adrichem Boogaert & Kouwe 1994).
Lithological description
Grey and green-grey, silty claystones containing a few thin sandstone beds and some thin, brown, intercalated dolomite beds.
Depositional setting
Floodplain and limnic depositional environment.
Definition of lower boundary
Overlies the Caledonian basement unconformably.
Definition of upper boundary
Overlain conformably by the sandstone-dominated Buchan Formation.
Thickness indication
Up to 296 m.
Geographical distribution
Regional correlation
UK: ?; GER: ?; BEL: ?
Age
Givetian - Frasnian.
Holostratotype
Well:
Depth (thickness) AH:
2717 - 3013 m (296 m)
Origin of name
Named after the South West Patch, a shoal in the central North Sea.
Previous name(s)
None.
Reviewed by (date)
Tom van Hooff (2017).
References
Van Adrichem Boogaert, H.A. & Kouwe, W.F.P. 1994. Stratigraphic nomenclature of The Netherlands; revision and update by RGD and NOGEPA, Section B, Devonian and Dinantian. Mededelingen Rijks Geologische Dienst, 50, 1-20.
Cite as
TNO-GDN ([YEAR]). Patch Formation. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from https://www.dinoloket.nl/en/stratigraphic-nomenclature/patch-formation.