Chalk Group Lithostratigraphy: East Anglia - Nettleton Stone
The Nettleton Stone (named 'Nettleton Member' by Jeans, 1980), generally comprises indurated, gritty chalk, similar in lithology to the Totternhoe Stone, but lacking a conspicuously burrowed basal contact with underlying strata (Gallois, 1994). It has been recorded in the Stowlangtoft Borehole [TL 9475 6882] in the Bury St Edmunds district, and in north Norfolk comprises hard creamish-coloured chalk in the upper part, passing down into grey and brownish gritty marly chalk, with brownish grey marl at the base above an irregular basal contact of indurated nodular chalk (Bristow, 1990; Gallois, 1994). The Nettleton Stone is recognised in the Lower Chalk of northern England, where it is immediately underlain by the Nettleton Pycnodonte Bed (Gaunt et al., 1992), the latter represented in north Norfolk by a concentration of the oyster Pycnodonte vesiculare in the marly chalk at the base of the Nettleton Stone (Gallois, 1994). In the Southern Region, the Nettleton Stone and Pycnodonte Bed equate with Jukes-Browne Bed 7 (Gaunt et al., 1992). At most localities in north Norfolk the Nettleton Stone is less than a metre thick (Gallois, 1994).
Macrofossil Biozonation: A. jukesbrownei Zone
Correlation: see Correlation with other UK Chalk Group successions
References
BRISTOW C R. 1990. Geology of the country around Bury St. Edmunds. Memoir of the British Geological Survey.
GAUNT, G D, FLETCHER, T P & WOOD, C J. 1992. Geology of the country around Kingston-upon-Hull and Brigg. Memoir of the British Geological Survey.
GALLOIS, R W.1994. Geology of the country around King's Lynn and The Wash. Memoir of the British Geological Survey.
JEANS, C V. 1980. Early submarine lithification in the Red Chalk and Lower Chalk of eastern England: a bacterial control model and its implications. Proceedings of the Yorkshire Geological Society, Vol. 43, 81-157.
See: Jukes-Browne Bed 7 (Southern Region), Nettleton Stone (Northern Region), Nettleton Pycnodonte Bed (Northern Region), marl, nodular chalk