Hospital Ground Formation

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

Alternated sheet-like, amalgamated channel sandstones, red-bed mudstones, with few thin, grey mudstone beds with rare coal seams. Sands are cream to pink, fine- to very coarse-grained, micaceous, locally conglomeratic, rounded to subangular, well- to poorly-sorted and well-cemented. Red-orange, white, and rarely variegated sandy mudstone intervals.

Depositional setting

Well- to poorly-drained fluvial fan to fluvial plain. Sandstones: small-scale braided fluvial channel systems and sheet floods. The fluvial systems formed sheets of stacked channel fills.

Definition of lower boundary

Placed at the base of the lowermost massive sandstone interval, overlying light-grey mudstones with frequent coal seams of the Maurits Formation.

Definition of upper boundary

Conformably by the Step Graben Formation, drawn above the uppermost massive sandstone which is succeeded by a mudstone interval of more than 60 m thick. In most wells the top of the formation is formed by the unconformable contact with the Upper Rotliegend Group. The precise boundary can be difficult to pick. Generally, a higher degree of lithification can be observed in the Carboniferous section. Moreover, Pennsylvanian (Silesian) sandstones tend to be more micaceous. In the northeastern offshore, the Hospital Ground Formation grades into grey, fine-grained, carbonaceous deposits, which belong to the upper part of the Maurits Formation.

Thickness indication
Up to 388 m.
Geographical distribution
Regional correlation
UK: Schooner Formation; GER: -; BEL: -.
Age
Moscovian.
Holostratotype
Depth (thickness) AH:
4058 - 4241 m (183 m)
Parastratotype
Depth (thickness) AH:
3575 - 3773 m (198 m)
Parastratotype
Depth (thickness) AH:
3633 - 3742 m (109 m)
Origin of name
Named after the Hospital Ground, a fishing ground in the vicinity of the type well.
Previous name(s)
None.
Reviewed by (date)
Tom van Hoof (2017).
References
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]). Hospital Ground Formation. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from http://www.dinoloket.nl/en/stratigraphic-nomenclature/hospital-ground-formation.