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

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The Newhaven Chalk Member, c. 60 m thick in Sussex, is marked by the lowest of the Buckle Marls at the base, and the upper of the two Castle Hill Marls at the top (Mortimore, 1986a). It comprises mostly soft, smooth-textured-chalk, with regularly developed nodular flint horizons and common marl seams throughout (Mortimore, 1986a). Occasional hard beds occur, and there are intervals of flintless chalk, but the member lacks the conspicuous tabular and semitabular flints that occur in the underlying Seaford Chalk (Mortimore, 1986a). Mortimore (1986a) subdivided the Newhaven Chalk Member as follows:

Member Beds
Newhaven Chalk Bastion Steps
Old Nore
Splash Point

Select a subdivision for more information

Macrofossil Biozonation: U. socialis Zone, M. testudinarius Zone, U. anglicus Zone, O. pilula Zone, basal G. quadrata 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