Informal (Van Adrichem Boogaert & Kouwe 1993).
Claystone, siltstone, sandstone and some minor coal.
Strata between the Rifgronden and Oyster Ground members are assigned to the undifferentiated Friese Front Formation and indicated informally as ‘main Friese Front member’.
Definition of lower boundary
Definition of upper boundary
late Callovian - early Tithonian.
Origin of name
Named after the Friese Front, a fisherman’s name for a shallower area north of the Wadden Islands, near the type locality.
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..
TNO-GDN ([YEAR]). main Friese Front member. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from http://www.dinoloket.nl/en/stratigraphic-nomenclature/main-friese-front-member.