South-west England Chalk Group Lithostratigraphy: Jukes-Browne & Hill, 1903, 1904 - Cenomanian Limestone Bed B
Unit B is a hard, whitish, gritty limestone, typically with green-coated nodules at the top, characterised by the echinoid Holaster subglobosus (Jukes-Browne & Hill, 1903).
Macrofossil Biozonation: Modern biostratigraphical studies indicate assignment to the M. dixoni Zone and A. rhotomagense Zone (Wright & Kennedy, 1984)
Correlation: see Correlation with other lithostratigraphical schemes for south-west England
see Correlation with other UK regions
JUKES-BROWNE, A J & HILL, W.1903. The Cretaceous rocks of Britain. Vol. 2 - The Lower and Middle Chalk of England. Memoir of the Geological Survey of the United Kingdom.
WRIGHT, C W & KENNEDY, W J. 1984. The Ammonoidea of the Lower Chalk. Part I. Monograph of the Palaeontographical Society. London: 1-126, pls 1- 40 (Publ. No. 567, part of Vol. 137 for 1983).