Chalk Group Lithostratigraphy: East Anglia - Cambridge Greensand

The Cambridge Greensand is as described in the adjacent Chilterns region. In recent surveys it has been recorded around Sudbury (Pattison et al., 1993) and Bury St Edmunds (Bristow, 1990) in Suffolk, and in the Ely district, Cambridgeshire. In these areas it is usually less than a metre in thickness, although up to 1.8 m was proved in boreholes in the Bury St Edmunds district (Bristow, 1990). The most northerly occurrence of the Cambridge Greensand is in the BGS Marnham Borehole [TF 7051 0803] (Morter & Wood, 1983). Gallois (1988) noted that over 40 different igneous and high-grade metamorphic rock types, with no known local provenance, formed angular boulders in the Cambridge Greensand, some over 0.5 m across and weighing up to 60 kg.

Macrofossil Biozonation:  ? M. mantelli Zone,  ? N. carcitanense Subzone (indigenous fauna)

Correlation: see Correlation with other UK successions

References

BRISTOW C R. 1990. Geology of the country around Bury St. Edmunds. Memoir of the British Geological Survey.

GALLOIS, R W.1988. Geology of the country around Ely. Br. Geol. Surv. Memoir.

MORTER, A A & WOOD, C J.1983. The biostratigraphy of Upper Albian - Lower Cenomanian Aucellina in Europe. Zitteliana, Vol. 10, 515-529.

PATTISON, J., BERRIDGE, N. G., ALLSOP, J. M. & WILKINSON, I. P. 1993. Geology of the country around Sudbury (Suffolk). Memoir of the British Geological Survey, Sheet 206 (England & Wales).

See: Cambridge Greensand (Chilterns and adjacent areas)