Chalk Group Lithostratigraphy: Northern England - Grasby Marl
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The Grasby Marl is c. 20 mm thick at Welton Wold Quarry [SE 970 282] (Whitham, 1991), and equates with the Methwold Marl of the East Anglian Chalk Group succession (Arthurton et al., 1994).
Macrofossil Biozonation: T. lata Zone
Correlation: see Correlation with other UK Chalk Group successions
References
ARTHURTON, R S, BOOTH, S J, MORIGI, A N, ABBOTT, M A W & WOOD, C J. 1994. Geology of the country around Great Yarmouth. Memoir of the British Geological Survey.
WHITHAM, F.1991. The stratigraphy of the Upper Cretaceous Ferriby, Welton and Burnham formations north of the Humber, north-east England. Proceedings of the Yorkshire Geological Society, Vol. 48(3), 227-255.
See: Methwold Marl