Bunes Member
(Bunesleddet)
(Harland 1980)
Main Lithologies. Thickly bedded limestone with organic buildups.
Basal stratotype. Skien-Langesund: Bunes (Harland 1980 Fig. 5) (NL 406 449).
Definition. The Bunes (formerly Bunæs) Member marks the base of the formation throughout Skien-Langesund, and is dominantly a thickly bedded, dark bioclastic limestone with 'patch reefs' (Harland 1980, 1981 a) 4-6m thick developed in its lower half. The member is 21.6m thick at Bunes where it is overlain by the Langesundstangen Member. It has a maximum thickness of 23m at Brevik and thins southwards to 17.2m at Steinvika in which direction its upper parts pass laterally into the Langesundstangen Member. The Bunes Member also thins northwards where its upper part passes into the Åsstranda Member (see Fig. 18).
Fauna. Harland (1980 pp.272-3) noted the rich shelly fauna in the algal-stromatoporoid-coral bioherms (see also Bockelie 1979, p.395) and recognised two brachiopod dominated assemblages at other levels in the member. The trilobites Stenopareia glaber (Kjerulf) and Toxochasmpos extensus (Boeck) occur in the more diverse of these associations.
(From Owen et al., 1990: The Ordovician Successions of the Oslo Region, Norway. NGU Special Publication 4. Figs. refer to the printed version.