| 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.
The Pegwell Silt is early to mid-Thanetian in age (NP6 to NP8), based on microfossils (especially nannofossils) (King, in prep.) and magnetostratigraphy (Ali and Jolley, 1996). |
| 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 13 m 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 [Obsolete Name and Code: Use PGWS]
(-5091)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| 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. |
| Reference(s): |
| 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. 2014. The stratigraphical framework for the Palaeogene successions of the London Basin, UK. British Geological Survey Open Report OR/14/008. 95 pp. |
| Ward, D J. 1977. The Thanet Beds exposure at Pegwell Bay, Kent. Tertiary Research, Vol. 1, p. 69-76. |
| 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. |
| 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. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
