Formal (Van Adrichem Boogaert & Kouwe 1994).
Claystones and sandstones with minor coal seams, and a variable amount of intercalated limestone and dolomite beds.
Under paralic conditions. Periods of active delta-front deposition alternated with repeated marine incursions, during which marine limestones and claystones were formed. In places a fluvial regime prevailed, resulting in a thick succession of stacked channel fills.
Definition of lower boundary
Overlies the Old Red Group conformably. Its base is marked by the lowermost carbonate bed.
Definition of upper boundary
Placed at the top of the highest limestone. Here the typical coarsening upward claystone/sandstone sequences of the conformably overlying Epen Formation (Limburg Group) begin. In areas which were subjected to later erosion, the group is overlain unconformably by younger formations (Rotliegend to Chalk groups).
UK: Farne Group; GER: Condroz Sandstone?; BEL: Condroz Sandstone?
Tournaisian - late Visean/early Serpukhovian.
Origin of name
Named after the Farne Islands off the north-east coast of England.
Van Adrichem Boogaert, H.A. & Kouwe, W.F.P. 1994. Stratigraphic nomenclature of The Netherlands; revision and update by RGD and NOGEPA, Section B, Devonian and Dinantian. Mededelingen Rijks Geologische Dienst, 50, 1-20.
TNO-GDN ([YEAR]). Farne Group. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from http://acc.dinoloket.nl/en/stratigraphic-nomenclature/farne-group.