Chalk Group Lithostratigraphy: Marlborough Downs/Berkshire Downs/Chilterns - Fognam Marl
The Fognam Marl occurs throughout the region, reaching a maximum thickness of 0.12 m. It equates with the Southerham Marl 2 of the Lewes Nodular Chalk Member in the Southern Region (Gale, 1996), and demonstrates that the Bottom Hardground Suite of Bromley & Gale's (1982) 'Chalk Rock Formation' represents a condensation of the greater part of the New Pit Chalk Member of the Southern Region.
Macrofossil Biozonation: upper T. lata Zone
Correlation: see Correlation with other parts of the UK
BROMLEY, R G & GALE, A S. 1982. The lithostratigraphy of the English Chalk Rock. Cretaceous Research, Vol. 3, 273 - 306.
See: Southerham Marl 2, New Pit Chalk Member (Southern Region), Lewes Nodular Chalk Member (Southern Region), Bottom Hardground Suite, hardground, marl