Chalk Group Lithostratigraphy: Northern England - Riby Marl
The Riby Marl, up to 50 mm thick, is named after Riby Quarry [TA 174 062] (Wood & Smith, 1978), and falls in the interval between the Southerham Marl 2 and Caburn Marl of the lower Lewes Nodular Chalk Member in southern England, and between the Mt. Ephraim Marl and Twin Marl in the East Anglian Chalk Group succession (Mortimore & Wood, 1986).
Macrofossil Biozonation: T. lata Zone
Correlation: see Correlation with other UK Chalk Group successions
References
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: Southerham Marls, Caburn Marl, Lewes Nodular Chalk, Mt Ephraim Marl, Twin Marl