Chalk Group Lithostratigraphy: East Anglia - Brandon Flint Series

The Brandon Flint Series is named after Brandon, Norfolk, where the large flints that comprise the interval were worked in prehistoric and recent times. At Grimes Graves [TL 818 898] the series consists of a c. 8 m thick interval of large nodular and semitabular flints, and a conspicuous marl, named the Grimes Graves Marl (Mortimore & Wood, 1986). The flints have received local flint miners names, in ascending order: Rough and Smooth Blacks, Floorstone, Wallstone, Upper Crusts and Toppings; between the Rough and Smooth Blacks and the Floorstone is the Grimes Graves Marl (Mortimore & Wood, 1986). This succession equates with the flint and marl-rich 'Basal Complex' of the North Downs, both being markers for the base of the Upper Chalk in the absence of the Chalk Rock (Mortimore & Wood, 1986). In northern England, the Brandon Flint Series equates with the interval between the Ravendale Flint and the Ludborough Flint, and in Sussex is represented by the Bridgewick Marls and associated Bridgewick Flints (Mortimore & Wood, 1986). In the northern England Chalk Group, the Grimes Graves Marl equates with the North Ormsby Marl, and in southern England, with Bridgewick Marl 1 (Mortimore & Wood, 1986).

Macrofossil Biozonation: basal S. plana Zone

Correlation: see Correlation with other UK Chalk Group successions

References

MORTIMORE, R N & WOOD, C J.1986. The distribution of flint in the English Chalk, with particular reference to the 'Brandon Flint Series' and the high Turonian flint maximum. In SIEVEKING, G de C & HART, M B. The scientific study of flint and chert. Cambridge University Press, Cambridge.

See: flint, Basal Complex, Chalk Rock, Ravendale Flint, Ludborough Flint, Bridgewick Marl 1