Southern Region Chalk Group Lithostratigraphy: The North Downs (Robinson, 1986) - Akers Steps Member

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The Akers Steps Member (stratotype: Akers Steps [TR 297 394]), 22.9 m thick at Akers Steps, comprises nodular chalk with regularly occurring laterally persistent flints and marl seams (Robinson, 1986). The base is marked by the first (un-named) laterally persistent flint in the North Downs Chalk Group succession, and the top is the base of the Crab Bay Marl, at the base of the overlying Ramsgate Chalk Formation (Robinson, 1986). Key markers include the Lydden Spout Flint, a distinctive large nodular flint with scattered smaller burrow-form flints below it, and the four Langdon Bay Marls, the lowest (c. 12cm thick) and highest (c. 9 cm thick) of which are the most conspicuous (Robinson, 1986).

Macrofossil Biozonation: T. lata Zone (pars)

Correlation: see Correlation with other lithostratigraphical schemes for the Southern Region

see Correlation with other UK regions.

References

ROBINSON, N D.1986. Lithostratigraphy of the Chalk Group of the North Downs, southeast England. Proceedings of the Geologists' Association, Vol. 97, 141-170.

See: flint, Ramsgate Chalk Formation

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