Chalk Group Lithostratigraphy: Northern England - Ulceby Marl

This marl, up to 70 mm thick, is distinguished from all other marls by being hard, silty and grey-brown in colour and characterised by abundant small crinoid columnals (Wood & Smith, 1978). It equates with the West Tofts Marl of the East Anglian Chalk Group succession and the Lewes Marl of the Lewes Nodular Chalk Member in southern England, and like the latter, is typically underlain by orange-stained, indurated chalk (Mortimore & Wood, 1986; Gaunt et al., 1992).

Macrofossil Biozonation: S. plana Zone

Correlation: see Correlation with other UK Chalk Group successions

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.

MORTIMORE, R N & WOOD, C J.1986. The distribution of flint in the English Chalk, with particular reference to the 'Brandon Flint Series' and the high Turonian flint maximum. In SIEVEKING, G de C & HART, M B. The scientific study of flint and chert. Cambridge University Press, Cambridge.

WOOD C J & SMITH, E G.1978. Lithostratigraphical classification of the Chalk in North Yorkshire, Humberside and Lincolnshire. Proceedings of the Yorkshire Geological Society, Vol. 42(2), 263-287.