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
Stratotypes:
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. 
Reference(s):
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). 
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. 
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 http://nora.nerc.ac.uk/17121/. 
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