| Computer Code: |
CAVM |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Quaternary Period (Q)
— Quaternary Period (Q) |
| Lithological Description: |
Sandy flint gravel. |
| Definition of Lower Boundary: |
Generally unconformably overlying Chalk bedrock or chalky till, but also overlying glacial silt infilling buried valleys. |
| Definition of Upper Boundary: |
At surface. |
| Thickness: |
Generally up to about 4 m but in places up to about 13 m thick. |
| Geographical Limits: |
Within the valley of the River Lark especially around Cavenham, Sicklesmere and between Tuddenham and Culford, Timworth and Hengrave, and the Lark tributaries, the Kennet and the Black Bourn. |
| Parent Unit: |
Lark Valley Formation (LKVY)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
2nd Terrace Of River Lark (Bristow,1990)
|
| Stratotypes: |
| Type Area |
The stratotype is the large area of terrace extending north from Cavenham (Clayton, 1983). |
| Reference(s): |
| Bristow, C R. 1990. Geology of the country around Bury St Edmunds. Memoir of the British Geological Survey, Sheet 189 (England and Wales). |
| Bowen, D Q. 1999. A revised correlation of Quaternary deposits in the British Isles. Geological Society Special Report, No. 23. |
| Clayton, A R. 1983. The sand and gravel resources of the country between Maidenhall and Barrow, Suffolk: description of 1:25000 Sheets TL76, TL77 and part of TL87. Mineral Assessment Report, 123, Institute of Geological Sciences, London. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E189
|
