Chalk Group Lithostratigraphy: Northern England - Un-named Marl

Immediately above the erosion surface at the top of the Hunstanton Formation, there is a marl (un-named; c. 0.025 m thick in the Hull-Brigg district; Gaunt et al., 1992) the off-shore correlative of which expands to a c. 0.4 m thick bed containing the bivalve Aucellina (Lott et al., 1985). In the Hunstanton district, this marl contains the belemnite Neohibolites ultimus (Gaunt et al., 1992). The association of Aucellina and N. ultimus is indicative of the earliest Cenomanian N. carcitanense Subzone of the M. mantelli Zone (Morter & Wood, 1983).

References

GAUNT, G D, FLETCHER, T P & WOOD, C J. 1992. Geology of the country around Kingston-upon-Hull and Brigg. Memoir of the British Geological Survey.

LOTT, G K, BALL, K C & WILKINSON, I P. 1985. Mid-Cretaceous stratigraphy of a cored borehole in the western part of the Central North Sea Basin. Proceedings of the Yorkshire Geological Society, Vol. 45, 235-248.

MORTER, A A & WOOD, C J.1983. The biostratigraphy of Upper Albian - Lower Cenomanian Aucellina in Europe. Zitteliana, Vol. 10, 515-529.

See: M. mantelli Zone, marl