| Computer Code: |
NWHAG |
Preferred Map Code: |
NWHA |
| Status Code: |
Full |
| Age range: |
Cromerian Stage (QC)
— Wolstonian Stage (QO) |
| Lithological Description: |
[Obsolete]
A suite of glacial, glaciofluvial and glaciolacustrine deposits that contain clasts derived predominantly from Lewisian, Torridonian, Cambrian, Caledonian igneous and Moine psammitic rocks of the northern Highlands. Including sandy diamictons (till), sand, gravel, silt and clay. Deposited by ice that radiated outwards from an ice divide positioned inland of the western seaboard of the Northern Highlands.
Provisional term listed in McMillan et al. (2005) not required in the present framework. |
| Definition of Lower Boundary: |
Sharp, unconformable contact with bedrock. |
| Definition of Upper Boundary: |
Unconformable contact with units of the Northwest Highlands Glacigenic Subgroup, or Flandrian deposits, predominantly peat. |
| Thickness: |
To 5m |
| Geographical Limits: |
The Northwest Highlands north of the Great Glen and the Inner Hebrides from Mull northwards, but excluding Caithness, the hinterland of Inverness and the Western Isles. |
| Parent Unit: |
none recorded or not applicable
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
The Northwest Highlands north of the Great Glen and the Inner Hebrides from Mull northwards, but excluding Caithness, the hinterland of Inverness and the Western Isles. |
| 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. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
