Formal (Munsterman et al. 2012).
Moderately to well-sorted, greenish-grey, slightly argillaceous, occasionally calcite cemented, glauconitic sandstones. Sediments show bioturbation and are locally pyritic, lignitic, and/or characterised by shell debris.
Shallow marine environment, ranging from offshore to lower shore face.
Definition of lower boundary
With the Oyster Ground Member (Skylge Formation) is marked by a sharp downward increase in GR-log readings.
Definition of upper boundary
With the Scruff Spiculite Member is marked by funnel-shaped GR-log pattern, resulting from the upward decreasing clay content.
Up to 316 m (F18-11).
UK: Humber Group; GER: ?; BEL: -.
Origin of name
Named after the shoal in the western part of the Wadden island Terschelling.
Reviewed by (date)
Sander Houben (2017).
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]). Noordsvaarder Member. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from http://www.dinoloket.nl/en/stratigraphic-nomenclature/noordsvaarder-member.