Chalk Group Lithostratigraphy: Northern England - Upper Orbirhynchia Bed

A thin unit of pale nodular limestones, with an acme of the brachiopod Orbirhynchia mantelliana and large ammonites of the genus Austeniceras (Gaunt et al., 1992). A similar horizon was described in East Anglia. This Orbirhynchia acme equates with the highest of the three O. mantelliana-rich bands recognised in the Lower Chalk at Folkestone by Gale (1989).

Macrofossil Biozonation: A. rhotomagense Zone

Correlation: see Correlation with other UK Chalk Group successions

References

GALE, A S. 1989. Field meeting at Folkestone Warren, 29th November, 1987. Proceedings of the Geologists' Association, Vol. 100 (1), 73-82.

GAUNT, G D, FLETCHER, T P & WOOD, C J. 1992. Geology of the country around Kingston-upon-Hull and Brigg. Memoir of the British Geological Survey.

See: Upper O. mantelliana Band (East Anglia), Upper O. mantelliana Band (Folkestone)