Southern Region Chalk Group Lithostratigraphy: Sussex lithostratigraphy of Mortimore (1986a) - Seaford Chalk Member

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The Seaford Chalk Member, c. 65 m thick, is marked by the upper of the two Shoreham Marls at the base, and the lowest of the Buckle Marls at the top (Mortimore, 1986a). The member comprises soft, pure white, regularly flinty chalk, with marl seams in the lower part, and locally conspicuous beds of inoceramid bivalve shell fragments (Mortimore, 1986a). Mortimore (1986a) subdivided the Seaford Chalk as follows:

Member Beds
Seaford Chalk Haven Brow
Belle Tout

Macrofossil Biozonation: M. coranguinum Zone

Correlation: see Correlation with other Southern Region Chalk Group classifications

see Correlation with other UK Chalk Group successions


MORTIMORE, R N.1986a. Stratigraphy of the Upper Cretaceous White Chalk of Sussex. Proceedings of the Geologists' Association, Vol. 97(2), 97-139.

See: marl, flint, Shoreham Marls