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. Combined fining- and coarsening-upward trends are observed. Some dark-grey mudstone intervals contain brackish-water fossil assemblages.
On wire-line logs the formation stands out by its relatively smooth GR-log pattern, combined with highly serrate patterns in other logs. Coals seams can be recognized by spikes of low acoustic velocity and low density with a high resistivity.
Predominantly lacustrine setting with intermittent swamp and fluvial-plain (meandering and anastomosing fluvial systems) conditions and rare marine incursions.
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.
Practically all formations of the Limburg Group can be overlain unconformably by the Lower Rotliegend Group, Upper Rotliegend Group, Zechstein Group, Rijnland Group, or Chalk Group. In the specific unit definitions these truncated situations will not be mentioned separately. Over large areas, late-diagenetic reddening has penetrated several tens of metres into the top of the Limburg Group. If a reddened interval of the Limburg Group is covered unconformably by a younger red-bed unit, the exact boundary can be difficult to pick.
