Skavråk Member
(Skavråkerleddet)
(Harland 1980)
Main Lithologies. Limestone and mudstone.
Basal Stratotype. Skien-Langesund: Skavråker (Harland 1980 Fig. 8) (NL 388 489).
Definition. This uniform sequence of thin beds of bioturbated calcilutites and mudstones constitutes the uppermost part of the Steinvika Formation over the whole of Skien-Langesund. It rests on, and interfingers slightly with, the Åsstranda Member in the north of the district and the Langesundstangen Member over the rest of the area (see Fig. 18). The member maintains a fairly constant thickness over the district being 12.45m thick at the type locality and between 8.3m-10.9m elsewhere (Harland 1980 p.275). The top of the member is the abrupt change to dark shales of the Venstøp Formation.
Fauna. The Skavråker Member contains a sparse fauna of brachiopods, trilobites and echinoderms and many horizons are heavily bioturbated (Harland 1980 p.276).
(From Owen et al., 1990: The Ordovician Successions of the Oslo Region, Norway. NGU Special Publication 4. Figs. refer to the printed version.