The BGS Lexicon of Named Rock Units — Result Details

Pegwell Silt Member

Computer Code: PGWS Preferred Map Code: notEntered
Status Code: Full
Age range: Thanetian Age (GT) — Thanetian Age (GT)
Lithological Description: The Pegwell Silt Member comprises interbedded silty sands, some clayey, and sandy or silty clays, with sparse bivalve fossils.
Definition of Lower Boundary: The base of the Pegwell Silt Member occurs at the appearance of fine-grained sand above the Stourmouth Silt Member (STMH).
Definition of Upper Boundary: The top of the Pegwell Silt Member is taken at the transitional change to more uniform fine-grained sands of the overlying Kentish Sands Member (KNTS).
Thickness: About 13m in east Kent, diminishing westwards.
Geographical Limits: North-east Kent, probably extending to Essex and west Kent.
Parent Unit: Thanet Formation (TAB)
Previous Name(s): Pegwell Marls (-5091)
Alternative Name(s): none recorded or not applicable
Partial Type Section  Cliffs and foreshore east of Herne Bay, Kent. This locality exposes the upper part of the formation as Beds A to I of Ward (1978), probably with several metres overlap with the more proximal sequence at Pegwell Bay (Knox et al., 1994, p.49, Curry, 1981; Daley, 1999; Ward, 1978). 
Partial Type Section  Cliffs near Little Cliffsend, Pegwell Bay, Kent. These cliffs expose the lower part of the Thanet Formation. Curry, 1981; Daley, 1999; Ward, 1977. 
Curry, D. 1981. Thanetian. 255-265 in Stratotypes of Palaeogene stages. POMEROL, C (editor). Mémoire Hors Série du Bulletin d'Information des Géologues du Bassin du Paris, No. 2. 
Ward, D J, 1978. The Lower London Tertiary (Palaeocene) succession of Herne Bay, Kent. Institute of Geological Sciences, Report 78/10. 
King, C. in prep. A revised correlation of Palaeogene and Neogene deposits in the British Isles. Geological Society of London Special Report. 
Ali, J R, and Jolley, D W. 1996. Chronostratigraphic framework for the Thanetian and lower Ypresian deposits of southern England. Geological Society, London, Special Publications, Vol. 101, 129-144. 
Haynes, J. 1956. Certain smaller British Paleocene foraminifera. Contributions from the Cushman Foundation for foraminiferal research, Vol. 7, 79-101. 
Knox, R W O, Hine, N M, and Ali, J R. 1994. New information on the age and sequence stratigraphy of the type Thanetian of southeast England. Newsletters on Stratigraphy, Vol. 30, 45-60. 
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 
Daley, B. 1999. London Basin: eastern localities, In: Daley, B., Balson, P. (Eds.), British Tertiary Stratigraphy. Geological Conservation Review Series 15, pp. 23-72. 
Jolley, D W, 1992. Palynofloral association sequence stratigraphy of the Palaeocene Thanet Beds and equivalent sediments in eastern England. Review of Palaeobotany and Palynology, Vol.74, p.207-237. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable