| Computer Code: |
CFC |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Pre-Pastonian/Baventian Stage (QV)
— Pre-Pastonian/Baventian Stage (QV) |
| Lithological Description: |
Mainly unfossiliferous pale grey silty clay, with rare sand laminae. The deposit is bioturbated and burrowed and locally contains shell debris, for example in the Captain's Wood Borehole TM35SE/62 [TM 4237 5455]. The deposit is thought to have formed on high intertidal mudflats. Studies of the palaeomagnetism, pollen and foraminifera tentatively suggest a Baventian-Pre-Pastonian age. |
| Definition of Lower Boundary: |
Gradual interbedded transition from the underlying Chillesford Church Sand Member, but locally oversteps onto Coralline Crag Formation and Red Crag Formation. |
| Definition of Upper Boundary: |
Unconformably overlain mainly by fluvial sand and gravel of the Kesgrave Formation, but also by till or sand and gravel of the Lowestoft Formation. |
| Thickness: |
6 m. |
| Geographical Limits: |
Onshore south-east Suffolk. No other occurences likely within the UK. |
| Parent Unit: |
Norwich Crag Formation (NCG)
|
| Previous Name(s): |
Chillesford Clay [Obsolete Name and Code: Use CFC]
(-3292)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Chillesford Brickyard Pit, Chillesford, Suffolk (Zalasiewicz and Mathers, 1985). |
| Reference(s): |
| Zalasiewicz, J A and Mathers, S J. 1985. Lithostratigraphy of the Red and Norwich crags of the Aldeburgh-Orford area. Southeast Suffolk Geological Magazine, Vol.122, 287-296. |
| Funnell, B M and West, R G. 1977. Preglacial Pleistocene deposits of East Anglia. 247-265 in Shotton, F W (Editor), British Quaternary studies: recent advances. [Oxford: Clarendon Press.] |
| Mathers, S J and Zalasiewicz, J A. 1988. The Red Crag and Norwich Crag formations of southern East Anglia. Proceedings of the Geologists Association, Vol.99, 261-278. |
| McMillan, A A, Hamblin, R J O, and Merritt, J W. 2011. A lithostratigraphical framework for onshore Quaternary and Neogene (Tertiary) superficial deposits of Great Britain and the Isle of Man. British Geological Survey Research Report, RR/10/03. 343pp. |
| Zalasiewicz, J A, Mathers, S J, Gibbard, Pl, Peglar, S M, Funnell, B M, Catt, J A, Harland, R, Long, P E and Austin, T J F. 1991. Age and relationships of the Chillesford Clay (Early Pleistocene-Suffolk, England). Philosophical Transactions of the Royal Society of London Series B-Biological Sciences, Vol.333, No.1266, 81-100. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E208
E225
E191
|
