| 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): |
| Aldiss, D T. 2012. The stratigraphical framework for the Palaeogene successions of the London Basin, UK. British Geological Survey Open Report OR/12/004. |
| 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). |
| 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. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
