Chalk Group Lithostratigraphy: East Anglia - Mount Ephraim Marl

This marl was identified and named by Ward et al. (1968) in the Middle Chalk of the Thetford district where it is 100-120mm thick, and it has also been correlated in borehole resistivity logs across East Anglia (Murray, 1986). It equates with the Melton Ross Marl of the northern England Chalk Group succession (Mortimore & Wood, 1986; Gaunt et al., 1992), and in the Trunch Borehole [TG 2933 3455] in north Norfolk is represented by a 80 mm marl with its base at a depth of 478.03 m (Arthurton et al.,1994).

Macrofossil Biozonation: T. lata Zone

References

ARTHURTON, R S, BOOTH, S J, MORIGI, A N, ABBOTT, M A W & WOOD, C J. 1994. Geology of the country around Great Yarmouth. Memoir of the British Geological Survey.

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.

WARD, W H, BURLAND, J B & GALLOIS, R W. 1968. Geotechnical assessment of a site at Mundford, Norfolk, for a large Proton Accelerator. Géotechnique, Vol. 18, 399-431.