| Computer Code: |
S753 |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Early Pleistocene (QPE)
— Mid Pleistocene (QPM) |
| Lithological Description: |
Cross-bedded and massive, moderately-sorted sand and gravel. |
| Definition of Lower Boundary: |
Unconformable on bedrock. |
| Definition of Upper Boundary: |
Overlain by mid-Pleistocene glacigenic deposits. Upper boundary may be difficult to determine where overlain by glaciofluvial sand and gravel, but the presence of more angular clasts, chalk, and poorer sorting in the latter is usually helpful. |
| Thickness: |
The aggradations are generally entrenched into bedrock with a difference in surface elevation in the order of 5 m. |
| Geographical Limits: |
Ancestral Thames Valley. |
| Parent Unit: |
Colchester Formation (CCHR)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| none recorded or not applicable |
| Reference(s): |
| Allen, P. 1984. Field guide to the Gipping and Waveney valleys, Suffolk, May 1984. Cambridge, Quaternary Research Association. |
| Bridgland, D R. 1988. The Pleistocene fluvial stratigraphy and palaeogeography of Essex. Proceedings of the Geologists' Association, Vol. 99, 291-314. |
| Whiteman, C A and Rose, J. 1992. Thames river sediments of the British Early and Middle Pleistocene. Quarterly Science Reviews, Vol.11, 363-375. |
| 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. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
