Facies, origin, and palaeontological inventory of an Early Carboniferous neptunian dyke in the Devonian reef limestone near Rösenbeck (Brilon Anticline, Rhenish Mountains)

Abstract

Abstract. The Devonian reef limestone complex of Rösen-beck near Brilon (Rhenish Mountains) shows numerous neptunian dykes and other hollows which have been filled with Carboniferous siliciclastic as well as fossil-rich carbonate sediments with ammonoids, conodonts, and chondrichthyan fish. While the shales of the infill can be interpreted as autochthonous sediments, the carbonates represent erratic blocks of sediments which were deposited in elevated areas but subsequently eroded and transported as erratic blocks into the karstic cavities. The biota of the carbonates demonstrates that two stratigraphic intervals are represented: (1) the Tournaisian-Viséan boundary interval, which can be identified by the presence of trilobites, and (2) the late Viséan (Asbian-Brigantian), proven by the presence of ammonoids and conodonts embedded in shales that probably have an early Serpukhovian age. Two carbonate facies can be distinguished in the Late Viséan blocks: (1) low-energy micritic sediments with Goniatites crenistria, which are probably equivalent to the crenistria Limestone and (2) high-energy (tempestite) sediments with numerous ammonoid specimens and in a more subordinate role other to fossil groups.

Mississippian (Early Carboniferous) sequence stratigraphy of the Rhenish Kulm Basin, Germany

“…from the Brilon reef area (Bär, 1968;Heuer et al, 2015), from the Warstein reef area (Uffenorde, 1977;Clausen et al, 1982; and, in the northeastern prolongation of the RKB, from the Iberg Reef in the Harz Mountains (Franke, 1973;Gischler, 1992Gischler, , 1996. For the latter, stratigraphic equivalence is well proved by ammonoids and trilobites (see compilation in Krebs, 1968b, and references therein).…”

“…5.9. Relictic late Viséan-basal Namurian sequences on high rising intrabasinal swells Heuer et al (2015) described the sedimentary fill of a neptunian dyke from the Brilon reef area. The results show the controlling factor of sea-level for the late Viséan-basal Namurian sedimentary history on top of a high rising intrabasinal swell and the applicability of sequence stratigraphy in this setting.…”