Southern Region Chalk Group Lithostratigraphy: Sussex lithostratigraphy of Mortimore (1986a) - Peacehaven Beds: Difference between revisions
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The Peacehaven Beds, c. 5 m thick locally in Sussex, are marked by the Old Nore Marl at the base and the Peacehaven Marl at the top (Mortimore, 1986a). These beds comprise soft, flinty chalk with marl seams, and harder, iron-stained, spongiferous, nodular chalk beds (Mortimore, 1986a). The Old Nore Marl and succeeding Old Nore Paired Marls are each overlain by a conspicuous nodular flint (Peacehaven Flint 1 & Peacehaven Flint 2) (Mortimore, 1986a, 1986b). | The Peacehaven Beds, c. 5 m thick locally in Sussex, are marked by the Old Nore Marl at the base and the Peacehaven Marl at the top (Mortimore, 1986a). These beds comprise soft, flinty chalk with marl seams, and harder, iron-stained, spongiferous, nodular chalk beds (Mortimore, 1986a). The Old Nore Marl and succeeding Old Nore Paired Marls are each overlain by a conspicuous nodular flint (Peacehaven Flint 1 & Peacehaven Flint 2) (Mortimore, 1986a, 1986b). | ||
Latest revision as of 13:45, 4 October 2013
The Peacehaven Beds, c. 5 m thick locally in Sussex, are marked by the Old Nore Marl at the base and the Peacehaven Marl at the top (Mortimore, 1986a). These beds comprise soft, flinty chalk with marl seams, and harder, iron-stained, spongiferous, nodular chalk beds (Mortimore, 1986a). The Old Nore Marl and succeeding Old Nore Paired Marls are each overlain by a conspicuous nodular flint (Peacehaven Flint 1 & Peacehaven Flint 2) (Mortimore, 1986a, 1986b).
The fauna of the Peacehaven Beds is characterised by the echinoids Offaster pilula and Echinocorys truncata and acmes of the brachiopods Terebratulina rowei and Cretirhynchia exsculpta (Mortimore, 1986a).
Macrofossil Biozonation: upper O. pilula Zone (pars)
Correlation: see Correlation with other Southern Region Chalk Group classifications
see Correlation with other UK Chalk Group successions
References
MORTIMORE, R N.1986a. Stratigraphy of the Upper Cretaceous White Chalk of Sussex. Proceedings of the Geologists' Association, Vol. 97(2), 97-139.
MORTIMORE, R N. 1986b. Controls on Upper Cretaceous sedimentation in the South Downs, with particular reference to flint distribution, in SIEVEKING, G de C & HART, M B. The scientific study of flint and chert. (London: Cambs. Univ. Press.)
See: marl, flint