Chalk Group Lithostratigraphy: Northern England - Ulceby Oyster Bed
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Comprises up to 0.2 m of distinctly soft, marly chalk with abundant pycnodonteine oysters, and brachiopods (Wood & Smith, 1978).
Macrofossil Biozonation: S. plana Zone
Correlation: see Correlation with other UK Chalk Group successions
References
WOOD C J & SMITH, E G.1978. Lithostratigraphical classification of the Chalk in North Yorkshire, Humberside and Lincolnshire. Proceedings of the Yorkshire Geological Society, Vol. 42(2), 263-287.