Derivation of name. The new name refers to the stratotype locality.
Stratotype. The road cut near the farm Skyberg, Mjøsa District (Lower Allochthon) is designated as the stratotype section. Here both the lower and upper boundaries of the new member are exposed or can easily be excavated. A simplified log is shown by Vidal & Nystuen (1991, fig. 5); a re-measured section is included in the composite log shown in Figure 9.
Lithology. The member consists of greenish-grey rather homogenous mudstone with sporadic small phosphorite nodules. There is a discontinuous sand- stone bed, up to 0.25 m thick, c. 1.4-1.6 m below top of the unit.
Boundaries. The Skyberg Member rests on the Evjevik Member with a sharp boundary. Upwards, it is unconformably overlain by the Alum Shale Formation.
Distribution and thickness. The new member is so far known only from the stratotype locality within the Lower Allochthon, where it is c. 7 m thick. The equivalent level is not preserved in the Parautochthon and Autochthon (Hawke Bay unconformity).
Age. The Skyberg Member contains sparse trilobites, which seemingly are indicative of the 'Ornamentaspis' linnarssoni Zone, but as yet no systematic study has been made of the fauna. Acritarchs, most of which are biostratigraphically undiagnostic, have been reported from the lower part of the unit (Vidal & Nystuen 1991). The presence of Baltisphaeridium [= Lophosphaeridium] dubium indicates that the level is older than the Eliasum-Cristallinium acritarch assemblage zone (cf. Hagenfeldt 1989a; Eklund 1990).
From: A.T. Nielsen & N.H. Schovsbo, 2007