| Computer Code: |
LESI |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Devensian Stage (QD)
— Holocene Epoch (QH) |
| Lithological Description: |
Very fine- to coarse-grained sand, silt and clay, grey and brownish grey, well laminated to thin-bedded, some pebbles up to 4cm, finely micaceous, rooty near top below sub-Carse Peat (where developed), depending on location within the palaeo-estuary, the dominant material varies from sand to clay. The deposit forms a series of buried raised beaches/terraces related to transgressive and regressive cycles of sea-level change. |
| Definition of Lower Boundary: |
Unconformable and transgressive base on older units including the Bothkennar Gravel, Abbotsgrange Silt and Kinneil Kerse Silt members of the Forth Clay Formation and the Errol Clay Formation. |
| Definition of Upper Boundary: |
Overlain unconformably by the sub-Carse Peat (where present) and transgressive estuarine clay, silt and sand of the Carse of Stirling Clay Member. |
| Thickness: |
Up to 9m |
| Geographical Limits: |
Forth valley west of Aberfoyle to the Forth estuary at Grangemouth. |
| Parent Unit: |
Carse Clay Formation (CARCL)
|
| Previous Name(s): |
Letham Beds [Obsolete Name and Code: Use LESI]
(-1650)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
M876 13/1 Borehole, BGS Ref. NS88SE/SE2567 13/1, from 6.20m to 11m depth. |
| Reference(s): |
| Browne, M A E, Graham, D K, and Gregory, D M. 1984. Quaternary estuarine deposits in the Grangemouth area, Scotland. Report of the Institute of Geological Sciences, No.16/3. |
| Paul, M A, Peacock, J D and Wood, B F. 1992. The engineering geology of the Carse Clay at the SERC Soft Clay Research Site, Bothkennar. |
| Paul, M A, Peacock, J D and Barras, B F. 1995. Flandrian Stratigraphy and Sedimentation in the Bothkennar-Grangemouth area, Scotland. Quaternary Newsletter, February 1995, No.75, 22-35 |
| Cameron, I B, Aitken, A M, Browne, M A E and Stephenson, D. 1998. Geology of Falkirk District. Memoir of the British Geological Survey Sheet 31E (Scotland). |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S038
S039
S031
S032
S038
|
