Chalk Group Lithostratigraphy: Northern England - Maidlands Lower Marls
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A group of three grey, chalky marls, c. 20-50 mm thick, in a c. 1.4 m interval of chalk (Whitham, 1993).
Macrofossil Biozonation: U. socialis Zone
Correlation: see Correlation with other UK Chalk Group successions
References
WHITHAM, F.1993. The stratigraphy of the Upper Cretaceous Flamborough Chalk Formation north of the Humber, north-east England. Proceedings of the Yorkshire Geological Society, Vol. 49(3), 235-258.