The BGS Lexicon of Named Rock Units — Result Details

Sheppey Member

Computer Code: SHEP Preferred Map Code: notEntered
Status Code: Full
Age range: Ypresian Age (GY) — Ypresian Age (GY)
Lithological Description: The Sheppey Member comprises silty clay diffusely interbedded with sandy clayey silt; it is commonly glauconitic. There are several layers of calcareous concretions.
Definition of Lower Boundary: The base of the Sheppey Member is marked by a change upwards from mainly homogeneous silty clay of the Aveley Member to silty clay with common sandy clayey silt interbeds.
Definition of Upper Boundary: The top of the Sheppey Member is marked by a change upwards from silty clay with common sandy clayey silt interbeds, to silty clay with sandy laminae, of the Claygate Member.
Thickness: About 55m in the type section (King, 1981, in prep.).
Geographical Limits: The Sheppey Member is present throughout the Hampshire and London basins, except in the west.
Parent Unit: London Clay Formation (LC)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Partial Type Section  Partial type section: Cliff section at The Naze, Walton-on-the-Naze. This exposes the lower 15 m of the unit. (Daley, 1999; King, 1981, fig. 14). 
Partial Type Section  Cliff and foreshore sections on the north side of the Isle of Sheppey, north Kent. King, 1984; King in prep. 
Reference(s):
King, C. 1984. The stratigraphy of the London Clay Formation and Virginia Water Formation in the coastal sections of the Isle of Sheppey, (Kent, England). Tertiary Research, Vol.5, 121-158. 
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/. 
King, C. in prep. A revised correlation of Palaeogene and Neogene deposits in the British Isles. Geological Society of London Special Report. 
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