| Computer Code: |
WALD |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Quaternary Period (Q)
— Quaternary Period (Q) |
| Lithological Description: |
Sand and gravel, containing only durable, mostly angular and sub-angular lithologies, particularly flint. Also contains significant quartz and quartzite clasts. Compared to older members the Waldringfield Member contains more flint, and quartzites are less commonly colourless. Palaeo current directions are to the north-east. |
| Definition of Lower Boundary: |
Unconformable on bedrock. |
| Definition of Upper Boundary: |
Overlain by Lowestoft Formation till and outwash sand and gravel. Outwash sand and gravel may contain chalk clasts and is generally less well sorted than the Waldringfield Member. Palaeo-current directions in the overlying sands and gravels are typically towards the south or south-east. |
| Thickness: |
Up to 5.3 m. |
| Geographical Limits: |
Restricted to course of early River Thames in Suffolk and Essex. |
| Parent Unit: |
Colchester Formation (CCHR)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
Kesgrave Sands and Gravels [Obsolete: use KGCA]
|
| Stratotypes: |
| Type Section |
Waldringfield. Allen, 1984; Rose and Allen, 1977. |
| Reference(s): |
| Allen, P. 1984. Field guide to the Gipping and Waveney valleys, Suffolk, May 1984. Cambridge, Quaternary Research Association. |
| Rose, J and Allen, P, 1977. Middle Pleistocene stratigraphy in south-east Suffolk. Quarterly Journal of the Geological Society of London, Vol.133, p.83-102. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
