| Computer Code: |
MXGL |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Devensian Stage (QD)
— Devensian Stage (QD) |
| Lithological Description: |
Head, scree and slope wash deposits, covering upland areas (Snaefell Formation). These include boulder scree, and some redeposited gravels and diamictons. |
| Definition of Lower Boundary: |
Generally unconformable on bedrock. |
| Definition of Upper Boundary: |
Generally the ground surface, locally overlain unconformably by deposits of gravel, sand, silt, clay and peat of the Britannia Catchments Group. |
| Thickness: |
Unrecorded, less than 10 m. |
| Geographical Limits: |
Mainly the central uplands of the Isle of Man, but also present on low ground around the coast (50k sheets,36, 45, 46, 56, 57). |
| Parent Unit: |
Caledonia Glacigenic Group (CALI)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
The valley of Druidale, 3.5km west of Snaefell, Isle of Man. Chadwick, R A et al. (2001). |
| Reference(s): |
| McMillan, A A, Hamblin, R J O and Merritt, J W. 2005. An overview of the lithostratigraphical framework for the Quarternary and Neogene deposits of Great Britain (onshore). British Geological Survey Research Report RR/04/04. |
| Chadwick, R A, Jackson, D I, Barnes, R P, Kimbell, G S, Johnson, H, Chiverell, R C, Thomas, G S P, Jones, N S, Riley, N J, Pickett, E A, Young, B, Holliday, D W, Ball, D F, Molyneux, S G, Long, D, Power, G M and Roberts, D H. 2001. Geology of the Isle of Man and its offshore area. British Geological Survey Research Report, RR/01/06. |
| 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. |
| Thomas, G S P. 1999. Northern England. 91-98 in Bowen, D Q (Editor), A revised correlation of Quaternary and Neogene deposits in the British Isles. Geological Society Special Report No.23. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
