Formal (Munsterman et al. 2012).
Alternating slightly silty to sandy claystones, glauconitic sandstones. Bioturbation is often present. Locally pyrite, lignite and/or shell fragments are present.
Restricted to shallow marine conditions.
Definition of lower boundary
Conformably overlies the Friese Front Formation. Based on the top of the first variegated or grey, non- marine clay-/siltstones or thick sand bed.
Definition of upper boundary
In the southern Central Graben unconformably overlain by the Scruff Greensand Formation. The boundary with the Scruff Greensand Formation is recorded by a funnel- shaped GR-log pattern, resulting from the upward decreasing clay content.
UK: Humber Group; GER: ?; BEL: -.
late Kimmeridgian - middle Tithonian.
Origin of name
Named after the Frysian name of the Wadden island Terschelling.
Munsterman, D.K., Verreussel, R.M.C.H., Mijnlieff, H.F., Witmans, N., Kerstholt-Boegehold, S. & Abbink, O.A. 2012. Revision and update of the Callovian-Ryazanian Stratigraphic Nomenclature in the northern Dutch Offshore, i.e. Central Graben Subgroup and Scruff Group. Netherlands Journal of Geosciences-Geologie en Mijnbouw, 91 (4), 555-590.
TNO-GDN ([YEAR]). Skylge Formation. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from https://www.dinoloket.nl/en/stratigraphic-nomenclature/skylge-formation.