| Computer Code: |
ARDR |
Preferred Map Code: |
AR |
| Status Code: |
Full |
| Age range: |
Neoproterozoic Era (AZ)
— Neoproterozoic Era (AZ) |
| Lithological Description: |
Interbedded schistose semipelite and micaceous psammite in roughly equal proportions |
| Definition of Lower Boundary: |
Transitional with underlying micaceous psammites of the Loch Laggan Psammite Formation.Marked by increase in semipelite and thin-banded micaceous psammite content. |
| Definition of Upper Boundary: |
Sharp to transitional with thinly bedded feldspathic and micaceous psammites of the Creag Meagaidh Psammite Formation |
| Thickness: |
770m in type area. |
| Geographical Limits: |
South-western Monadhliath Highlands, Glen Roy - Glen Banchor, and Adverikie and Ben Alder Forest areas. |
| Parent Unit: |
Corrieyairack Subgroup (GRCO)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Reference Section |
Roadcuts on north side of A86, north of Lower Laggan Reservoir. |
| Type Area |
South wall of Coire Ardair on Creag Meagaidh |
| Reference Section |
Summit area of Creag Pitridh - upper contact. |
| Reference(s): |
| British Geological Survey. 1995. Glen Roy, Scotland sheet 63W. Solid Geology 1:50 000 (Keyworth, Nottingham: British Geological Survey.) |
| Key, R M, Clark, G C, May, F, Phillips, E R, Chacksfield, B C and Peacock, J D, 1997. Geology of the Glen Roy district. Memoir of the British Geological Survey, Sheet 63W [Scotland]. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S074
S063
S063
S073
|
