|Premise||Unit, defined by Van Adrichem Boogaert and Kouwe (1995).|
|Derivatio nominis||Named after the Caumerbeek, a small stream running through the town of Heerlen, in the heart of the former Dutch coal-mining district. Several of the coal mines were situated along this stream.|
|Type section||Location map||See figure (pdf)|
|Depth||1689 to 2927 m|
|Length||1238 m along hole|
|Definition||Group of formations, comprising a thick succession of predominantly fine-grained siliciclastic deposits with intercalated coal seams. In the northwestern offshore, the subgroup contains a succession of coarse-grained, gravelly sandstones.|
|Correlation||In the UK offshore adjoining the Dutch quadrants P and K, the Westoe Coal Formation is the equivalent of the Baarlo, Ruurlo and Maurits Fms. Adjoining Quadrants J and D the Caister Coal Formation corresponds with the Klaverbank Formation. The Westoe Coal Formation is equivalent to the Maurits Formation Formation there (Cameron (1993) ). The basal interval of the Schooner Formation can be correlated with the youngest interval of the Maurits Formation Formation.|
|Age||Namurian B/C or Early Westphalian A to Early Westphalian C. Paproth (1983) give an overview of all relevant biozonations. Palynological studies were published by Smith (1967) ,van Wijhe (1974) , Clayton (1977) ; van de Laar (1990) . The ranges of some palynomorphs with stratigraphic value in the Netherlands are presented in Figure C.1 (see pdf)|
|Depositional Setting||The deposits of the subgroup reflect deltaic and fluvial-plain sedimentation in a lacustrine basin with a number of marine incursions. The continuation of the Silesian regressive megasequence is demonstrated by the gradual retreat of basin and prodelta deposition, in favour of delta- and fluvial-plain deposition. In the Baarlo Formation, prodelta deposits still constitute the bulk of each depositional cycle. These show marked coarsening-upward patterns and are 20 to 300 m thick, with an average around 100 m. In the Ruurlo Formation the sequences thin to an average of 50 m, and become more symmetrical, combined fining and coarsening. The depositional setting alternated between upper and lower delta plain. Prodelta deposits are of subordinate importance. In the Klaverbank Formation, the equivalent of the Baarlo and Ruurlo Formations in the northwestern Dutch offshore, the depositional setting alternated between delta slope and fluvial plain, but in a coarser-grained development. During the deposition of the Maurits Formation the setting changed to stable lower delta-plain facies across the entire Netherlands on- and offshore.|
|Subdivision||The Caumer Subgroup consists of four formations. The Klaverbank Formation is restricted to the northwestern Dutch offshore. The Baarlo and Ruurlo Formation are the age equivalents of this formation in the rest of the country. The Maurits Formation occurs throughout the Netherlands on- and offshore.|
|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].