The BGS Lexicon of Named Rock Units — Result Details

Lessness Shell Bed

Computer Code: LNSH Preferred Map Code: notEntered
Status Code: Full
Age range: Ypresian Age (GY) — Ypresian Age (GY)
Lithological Description: The Lessness Shell Bed comprises fine- to medium-grained sand with shelly lenses and scattered very well-rounded flint gravel. It interfingers with non-shelly buff-coloured sand. It contains a varied fossil fauna including brackish to marine molluscs, fish teeth, birds and a significant, diverse assemblage of terrestrial mammals (Hooker, 1991, 2010; King, 1981, p.20).
Definition of Lower Boundary: The Lessness Shell Bed is underlain by bedded white sand, within the Blackheath Member (Hooker, 2010).
Definition of Upper Boundary: The Lessness Shell Bed is overlain by non-shelly buff-coloured sand or by gravels in the upper part of the Blackheath Member.
Thickness: The Lessness Shell Bed varies in thickness from 0 to 2m over only a few metres lateral distance.
Geographical Limits: The Lessness Shell Bed occurs in south-east London.
Parent Unit: Blackheath Member (BLB)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Type Section  Charlton Pit (or Gilbert’s Pit), just south-west of Maryon Park, Charlton, London Borough of Greenwich. Daley, 1999; Hooker, 2010. 
Reference Section  Abbey Wood, London Borough of Bexley. Hooker, 2010. 
Ellison, R A, Woods, M A, Allen, D J, Forster, A, Pharaoh, T C and King, C. 2004. Geology of London. Memoir of the British Geological Survey, Sheets 256 (North London), 257 (Romford), 270 (South London), 271 (Dartford) (England and Wales). 
Aldiss, D.T., 2012. The stratigraphical framework for the Palaeogene successions of the London Basin, UK. British Geological Survey Open Report OR/12/004. Available from 
Hooker, J J. 2010. The mammal faunas of the early Eocene Blackheath Formation of Abbey Wood, London. Monograph of the Palaeontographical Society, London, 164, 1-162. 
Hooker, J J. 1991. The sequence of mammals in the Thanetian and Ypresian of the London and Belgian basins. Location of the Palaeocene-Eocene boundary. Newsletters in Stratigraphy, Vol. 25, 75-90. 
Daley, B. 1999. London Basin: eastern localities, In: Daley, B., Balson, P. (Eds.), British Tertiary Stratigraphy. Geological Conservation Review Series 15, pp. 23-72. 
King, C, 1981. The stratigraphy of the London Clay and associated deposits. Tertiary Research Special Paper No.6. (Backhuys: Rotterdam). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable