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. 
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. 
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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable