| Computer Code: |
RUVN |
Preferred Map Code: |
R |
| Status Code: |
Full |
| Age range: |
Neoproterozoic Era (AZ)
— Neoproterozoic Era (AZ) |
| Lithological Description: |
Coarsely foliated, migmatic semipelite and pelite with subordinate striped psammites with bands of calcsilicate rock. Minor amphibolite pods and lenses. |
| Definition of Lower Boundary: |
Marked lithological contact with underlying arkosic psammites of the Glenshirra Subgroup, commonly attenuated locally, possibly unconformable. |
| Definition of Upper Boundary: |
Poorly exposed, incoming of well-bedded psammites [turbiditic] of the Loch Laggan Psammite Formation. |
| Thickness: |
In excess of 200 m - difficult to estimate due to complex fold patterns. |
| Geographical Limits: |
Strath Nairn and north-western part of Monadhliath Mountains, Central Highlands, 1:50 K sheets 73E and 74W. |
| Parent Unit: |
Corrieyairack Subgroup (GRCO)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Reference Section |
Roches moutonees immediately northeast of Achneim House, Strath Nairn. |
| Type Area |
Prominent ice-sculptured crags of Craig Ruthven and Stac Gorm on the southern shores of Loch Ruthven. |
| Reference Section |
Crags some 200 m - 300 m south and east of Milton Farm, Strath Nairn = upper parts of formation. |
| Reference(s): |
| none recorded or not applicable |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S074
S073
S073
|
