Chalk Group Lithostratigraphy: Northern England - Deepdale Lower Marl

The Deepdale Lower Marl (stratotype: Deepdale Pit [TA 0455 1820] ), immediately overlying chalk with large specimens of the bivalve Inoceramus, is c. 80 mm thick, with a sharply defined base and gradational top (Wood & Smith, 1978). It equates with the Twin Marl of the East Anglian Chalk Group succession, and the Caburn Marl in the lower Lewes Nodular Chalk of southern England (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: Twin Marl, Caburn Marl, Lewes Nodular Chalk