main Maurits member

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

Succession of mainly light-grey mudstones with relatively frequent intercalations of coal seams and subordinate intercalations of grey and buff, (sub-)angular, poorly- to moderately-sorted, very fine- to coarse-grained, argillaceous sandstones.

Depositional setting

Lacustrine with intermittent swamp and fluvial-plain (meandering and anastomosing fluvial systems) conditions and rare marine incursions.

Definition of lower boundary

Conformably on the Klaverbank or the Ruurlo Formation. The contact is characterised by an abrupt upward increase in clay and coal-seam content. This level marks the top of the overall coarsening-upward trend in the lower part of the Limburg Group. In the onshore, this boundary can be somewhat difficult to discern because of the argillaceous, locally coal-rich nature of the underlying Ruurlo Formation.

Definition of upper boundary

Conformable contact with overlying Kemperkoul Member.

Thickness indication
Not thicker than the Maurits Formation.
Regional correlation
UK: Westoe Coal Formation & Schooner Formation; GER: Horst, Dorsten & Lembeck Formations; BEL: Charleroi and Flénu Formations.
latest Bashkirian - Moscovian.
Origin of name
Named after the former colliery Maurits in the south of the province of Limburg. In the coal-mining nomenclature this name referred to the Upper Westphalian B.
Previous name(s)
Reviewed by (date)
Geert-Jan Vis (2019).
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]). main Maurits member. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from