View source for Chalk Group Lithostratigraphy: Northern England - North Ormsby Marl

This is a laminated marl, up to 110mm thick, with a sharp base and gradational top (Wood & Smith, 1978), equating with the Grimes Graves Marl of the East Anglia Chalk Group succession and the Bridgewick Marl 1 of the Lewes Nodular Chalk Member in southern England (Mortimore & Wood, 1986). In Germany the probable correlative of the North Ormsby Marl is a similarly thick marl designated M<sub>E </sub>(Gaunt ''et al''., 1992) In conjunction with the underlying Ravendale Flint and Triple Tabular Flint, and overlying Ludborough Flint, it forms a mappable feature that equates with the Brandon Flint Series of East Anglia and the Basal Complex of the North Downs (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.

See: Brandon Flint Series, Basal Complex

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