Munsterman , D., Verreussel , R., Mijnlieff , H., Witmans , N., Kerstholt-Boegehold , S. and Abbink , O. (2014) “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, 91, pp. 555-590. doi: 10.1017/S001677460000038X.