Scruff Spiculite Member

SGGSP

Formal (Van Adrichem Boogaert & Kouwe 1993).

Light green-grey, fine-grained, glauconitic and slightly argillaceous intensely bioturbated sandstones. Primary sedimentary structures are absent. Sponge spicules may make up the bulk of the framework forming a bioclastic sandstone.

Offshore to shoreface environment.

Marked by an increase in GR-log readings, resulting from the downward increasing clay content. A hiatus occurs in the Central Graben, but deposition was continuous in the depocentre of the Terschelling Basin (Abbink et al. 2006). The abundant occurrence of the sponge spiculae or its moulds may be taken as an additional criterion.

Overlain by the Stortemelk Member, boundary is placed at the transition of a cylinder- or funnel-shaped GR-log pattern (Scruff Spiculite Member) to a bell-shaped pattern (Stortemelk Member). This level is nearly always marked by a clear GR-log peak, belonging to the Stortemelk Member.

Up to 140 m (L03-01).

UK: Humber Group; GER: ?; BEL: -.

middle Tithonian - early Berriasian.

Named after the offshore Upper Scruff Bank near well F03-03.

None.

Sander Houben (2017).

Van Adrichem Boogaert, H.A. & Kouwe, W.F.P. 1993. Stratigraphic nomenclature of The Netherlands; revision and update by RGD and NOGEPA, Section G, Upper Jurassic and Lower Cretaceous. Mededelingen Rijks Geologische Dienst, 50, 1-80..

Abbink, O.A., Mijnlieff, H.F., Munsterman, D.K. & Verreussel, R.C.M.H. 2006. New stratigraphic insights in the ‘Late Jurassic’ of the Southern Central North Sea Graben and Terschelling Basin (Dutch Offshore) and related exploration potential. Netherlands Journal of Geosciences 85, 221-238.