Computer Code: |
INVG |
Preferred Map Code: |
INV |
Status Code: |
Full |
Age range: |
Devensian Stage (QD)
— Devensian Stage (QD) |
Lithological Description: |
Sandy diamictons (till), sand, gravel, silt and clay. Clasts are derived predominantly from the comminution of Devonian (Old Red Sandstone) sandstone, siltstone and conglomerate. |
Definition of Lower Boundary: |
Sharp, unconformable, uneven contact with bedrock. |
Definition of Upper Boundary: |
Ground surface or unconformable contact with various Holocene deposits. |
Thickness: |
Up to 40 m. |
Geographical Limits: |
The hinterland of the Moray Firth, including the north-eastern end of the Great Glen, the southern shores of the Moray Firth as far east as Buckie, the Black Isle, and the land surrounding the Cromarty and Dornoch firths. |
Parent Unit: |
Caledonia Glacigenic Group (CALI)
|
Previous Name(s): |
Central Grampian Drift Group [Obsolete Name and Code: Use IAG]
(-772)
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
Type Area |
See the stratotypes of constituent formations, including the Finglack Till, Kincrdy Silts, Red Craig Gravels, Athais Till, Allt Odhar Peat, Odhar Gravel and Dalcharn Palaeosol. |
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. |
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. |
Fletcher, T P et al. 1996. Geology of the Fortrose and eastern Inverness district. Memoir of the British Geological Survey, Sheet 84W (Scotland). |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
none recorded or not applicable |