Chalk Group Lithostratigraphy: East Anglia - Paradoxica Bed

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The Paradoxica Bed, 0.2-0.5 m thick, forms the base of the Chalk Group in north Norfolk, and is named after the abundant Thalassinoides paradoxicus burrows, formerly thought to be the remains of the sponge Spongia paradoxica, but now interpreted as crustacean burrows (Gallois, 1994). The bed comprises hard, porcellaneous, chalky limestone with erosive hardgrounds, representing a highly condensed succession equivalent to the Porcellaneous Beds in the southern part of East Anglia (Gallois, 1994). Fossils include varoius species of brachiopod, the bivalve Aucellina and the belemnite Neohibolites ultimus (Gallois, 1994).

Macrofossil Biozonation: M. mantelli Zone, N. carcitanense Subzone

Correlation: see Correlation with other UK Chalk Group successions

References

GALLOIS, R W.1994. Geology of the country around King's Lynn and The Wash. Memoir of the British Geological Survey.

See: Porcellaneous Beds, hardground

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