Southern Region Chalk Group Lithostratigraphy: Bristow et al. (1997) - Newhaven Chalk: Difference between revisions
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The Newhaven Chalk, 50-75 m thick, equates with the greater part of the Newhaven Chalk of Mortimore (1986a). Comprising soft to medium hard chalk with regular marl seams and flint bands, the Newhaven Chalk is defined by a negative feature break at its base (approximately coincident with Buckle Marl 1 of Mortimore, 1986a) and a positive break of slope at its top (Bristow ''et al''., 1997). The stratigraphical position of the upper feature-forming boundary varies between the Meeching Marls (in the upper Newhaven Chalk of Mortimore, 1986a) and the Castle Hill Marls (at the top of the Newhaven Chalk of Mortimore, 1986a) of Mortimore (1986a) (Bristow ''et al''., 1997). The basal boundary is typically associated with abundant distinctively-shaped flints formed around the trace fossil ''Zoophycos''. | The Newhaven Chalk, 50-75 m thick, equates with the greater part of the Newhaven Chalk of Mortimore (1986a). Comprising soft to medium hard chalk with regular marl seams and flint bands, the Newhaven Chalk is defined by a negative feature break at its base (approximately coincident with Buckle Marl 1 of Mortimore, 1986a) and a positive break of slope at its top (Bristow ''et al''., 1997). The stratigraphical position of the upper feature-forming boundary varies between the Meeching Marls (in the upper Newhaven Chalk of Mortimore, 1986a) and the Castle Hill Marls (at the top of the Newhaven Chalk of Mortimore, 1986a) of Mortimore (1986a) (Bristow ''et al''., 1997). The basal boundary is typically associated with abundant distinctively-shaped flints formed around the trace fossil ''Zoophycos''. | ||
Latest revision as of 14:26, 4 October 2013
The Newhaven Chalk, 50-75 m thick, equates with the greater part of the Newhaven Chalk of Mortimore (1986a). Comprising soft to medium hard chalk with regular marl seams and flint bands, the Newhaven Chalk is defined by a negative feature break at its base (approximately coincident with Buckle Marl 1 of Mortimore, 1986a) and a positive break of slope at its top (Bristow et al., 1997). The stratigraphical position of the upper feature-forming boundary varies between the Meeching Marls (in the upper Newhaven Chalk of Mortimore, 1986a) and the Castle Hill Marls (at the top of the Newhaven Chalk of Mortimore, 1986a) of Mortimore (1986a) (Bristow et al., 1997). The basal boundary is typically associated with abundant distinctively-shaped flints formed around the trace fossil Zoophycos.
At Whitecliff [SZ 639 856], Isle of Wight, most of the Newhaven Chalk is represented by an anomalously condensed succession of chalk with conspicuous hardgrounds lacking flints and marl seams, caused probably by a tectonic influence (Mortimore & Pomerol, 1997).
Macrofossil Biozonation: U. socialis Zone, M. testudinarius Zone, U. anglicus Zone, O. pilula Zone & (locally) basal G. quadrata Zone
Correlation: see Correlation with other Southern Region successions
see Correlation with other UK successions
References
BRISTOW, C. R., MORTIMORE, R. N. & WOOD, C. J. 1997. Lithostratigraphy for mapping the Chalk of southern England. Proceedings of the Geologists' Association, Vol. 108, 293-315.
MORTIMORE, R N.1986a. Stratigraphy of the Upper Cretaceous White Chalk of Sussex. Proceedings of the Geologists' Association, Vol. 97(2), 97-139.
See: Newhaven Chalk (Mortimore, 1986a), marl, flint, Buckle Marl 1