| Computer Code: |
CHAK |
Preferred Map Code: |
CH |
| Status Code: |
Full |
| Age range: |
Devensian Stage (QD)
— Devensian Stage (QD) |
| Lithological Description: |
Reddish brown, sandy, silty, clayey, stony diamicton with clasts of greywacke, red sandstone, siltstone and grey granodiorite. Generally very compact. |
| Definition of Lower Boundary: |
Unconformable on bedrock. |
| Definition of Upper Boundary: |
Sharp, erosional contact with deposits of the overlying Plumpe Sand and Gravel Formation (or members thereof). |
| Thickness: |
20 m. |
| Geographical Limits: |
Solway lowlands. |
| Parent Unit: |
Irish Sea Coast Glacigenic Subgroup (ISCG)
|
| Previous Name(s): |
Lower Boulder Clay [Obsolete Name and Code: Use CHAK, STIL, SEAG, RVTI, LWTI, STPTG]
(-2079)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
River cliff of the Logan Burn, 1.5 km south of Chapelknowe, Dumfries-shire. Geologists' field locality card ME300. |
| Reference(s): |
| 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. |
| McMillan, A A, Merritt, J W, Auton, C A and Golledge, N R [In preparation]. The Quaternary geology of the Solway area. BGS Research Report. |
| Trotter, F M. 1929. The glaciation of the Eastern Edenside, the Alston Block, and the Carlisle Plain. Quarterly Journal of the Geological Society of London, Vol.85, 549-612. |
| Trotter, F M and Hollingworth, S E, 1932. The glacial sequence in the North of England. Geological Magazine, Vol.69, 374-380. |
| Trotter, F M, 1922. Report from the Cumberland District. In: Summary of the Progress of the Geological Survey of Great Britain for 1921, 46-48. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
