|Premise||This unit corresponds with the upper part of the former coal-mining group Jabeek. It correlates with the upper part of the Productive Measures and the lower part of the Tubbergen Sandstone Formation of NAM (1980) .|
|Derivatio nominis||Named after the village of Kemperkoul in the south of the province of Limburg.|
|Type section||Location map||See figure (pdf)|
|Depth||498 to 935 m|
|Length||437 m along hole|
|Definition||Succession of light- to dark-grey mudstones with frequent intercalations of coal seams and intervals of grey and buff, (sub-)angular, fairly- to poorly-sorted, very fine- to coarse-grained channel and sheet sandstones of 5 to 15 m thick. Fining- as well as coarsening-upward trends are common. The dark mudstones can contain a fresh- or brackish-water fossil assemblage.|
|Upper Boundary||The formation is unconformably covered by the Chalk Group in the type well, but it can be succeeded conformably by the massive sandstones of the Neeroeteren Formation, e.g. Belgian wells Gruitrode (KB 172) and Neerglabbeek (KB 146: Dusar (1989) ).|
|Lower Boundary||The basal contact with the main Maurits member is situated at the base of the lowermost massive sandstone bed which has a thickness of several metres.|
|Correlation||The Tubbergen Formation is its lateral equivalent in the Ems Low, whereas the Hellevoetsluis Formation and the Strijen Formation are the lateral equivalents in the western and central Campine Basin.|
|Distribution||Restricted to the southeastern Campine Basin. It grades into the Dinkel Subgroup towards the north and northwest.|
|Age||Late Westphalian C - earliest Westphalian D. The base of the member in the type section practically coincides with the so-called Hagen-1 Tonstein bed. This horizon corresponds with the boundary between Lower and Upper Westphalian C Paproth et al (1983) . In Belgium, first ocurrence of Neuropteris ovata (defining the base of the Westphalian D) has been encountered in the uppermost interval of this member (Dusar (1989) ).|
|Depositional Setting||The deposits reflect an alternation of lake, swamp and flood-plain deposits. Sandstones were deposited as low- and high-sinuosity fluvial channel fills, associated overbank deposits and lacustrine deltas. Provenance studies have indicated that the sandstones in the Kemperkoul Member were at least partly sourced from the London-Brabant Massif (Pagnier, pers. comm.). Therefore this high appears to have started supplying coarse-grained sediments into the eastern Campine Basin in the Late Westphalian C.|
|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].