Chalk Group Lithostratigraphy: East Anglia - Paramoudra Chalk

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The Paramoudra Chalk is exposed on the Norfolk coast between East Runton [TG 2010 4210] and Cromer [TG 2200 4220] (Peake & Hancock, 1970; Pitchford, 1990a). In the Trunch Borehole [TG 2933 3455] this unit may be 60 m thick (Arthurton et al., 1994), but Pitchford (1990a) and Johansen & Surlyk (1990) estimate c. 22-25 m. This division is characterised by vertical columns of cylindrical flints (paramoudras) up to several metres in height (Wood, 1988; Pitchford, 1990a). Paramoudras, formed around the burrow Bathichnus paramoudrae (Bromley et al., 1975), appear sporadically in the higher part of the Beeston Chalk, but become especially abundant in the lower part of the Paramoudra Chalk in the Norwich area, where a twofold subdivision is recognised (Paramoudra1 & Paramoudra2) (Wood, 1988). The coastal succession is apparently rather barren of fauna (Wood, 1988), and there is no published lithological log to compare with the Norwich succession. East of Cromer, there are (?glacially disturbed) subtidal reefs of (?Paramoudra) chalk (Peake & Hancock, 1970). The top of the Paramoudra Chalk is marked by the Overstrand Pyramidata Hardground.

Macrofossil Biozonation: top B. mucronata Zone

Correlation: see Correlation with other UK Chalk Group successions

References

BROMLEY, R G & GALE, A S. 1982. The lithostratigraphy of the English Chalk Rock. Cretaceous Research, Vol. 3, 273 - 306.

JOHANSEN, M B & SURLYK, F.1990. Brachiopods and the stratigraphy of the Upper Campanian and Lower Maastrichtian Chalk of Norfolk, England. Palaeontology, Vol. 33(4), 823-872.

PEAKE, N B & HANCOCK, J M. 1970. The Upper Cretaceous of Norfolk [reprinted with corrigenda and addenda] In LARWOOD, G P & FUNNELL, B M (eds.), The Geology of Norfolk. London & Ashford.

PITCHFORD, A J.1990a. A Summary of the stratigraphy of current exposures of Belemnitella mucronata Zone Chalk (Campanian, Upper Cretaceous) in Norfolk. Bulletin of the Geological Society of Norfolk, Vol. 40, 3-24.

WOOD, C J. 1988. The stratigraphy of the Chalk of Norwich. Bulletin of the Geological Society of Norfolk, No. 38, 3- 120.

See: Overstrand Pyramidata Hardground, Paramoudras, flint

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