Sequence of red-brown, siliciclastic sediments and basaltic volcanics, in highly variable proportions.
Fluvial. Arid to semi-arid environment and basaltic lava flows, related to late Hercynian rifting.
Disconformably overlies the erosion surface at the top of the Limburg Group. It succeeds mainly fine-grained red beds or coal measures. The lower boundary has been placed at this disconformity, which may be difficult to distinguish in a red-bed succession.
The upper boundary is formed by the top of the volcanics. The group is dis- or unconformably overlain by the black shales of the Coppershale Member of the Zechstein 1 (Werra) Formation or by the sandstones and red-bed mudstones of the Upper Rotliegend Group, which does not contain volcanics.