| Computer Code: |
CNLH |
Preferred Map Code: |
CL |
| Status Code: |
Full |
| Age range: |
Neoproterozoic Era (AZ)
— Neoproterozoic Era (AZ) |
| Lithological Description: |
Schistose to gneissose semipelite, garnetiferous, with interbanded micaceous psammite. Minor feldspathic and siliceous psammite beds; calc-silicate lenses common. |
| Definition of Lower Boundary: |
Sharp contact with underlying grey feldspathic psammites of the Gairbeinn pebbly psammite member - well exposed in Garbh Choire [NN 4628 9895] and south of Uinneag Mhin Choire [NN 4651 9955]. |
| Definition of Upper Boundary: |
Transitional through upper psammite and semipelite unit defined by incoming of thick turbiditic psammites of the Loch Laggan Psammite Formation. |
| Thickness: |
c. 500 m. |
| Geographical Limits: |
Central Highlands of Scotland, sheets 63W, 63E and 74W. |
| Parent Unit: |
Corrieyairack Subgroup (GRCO)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Summit area of Gairbeinn [2940'] to Coire nan Laogh. Basal contact well exposed. |
| Reference Section |
Northeast flank of A'chailleach. Top and basal contacts well-exposed. |
| Reference(s): |
| Haselock, P J, Whinchester, J A and Whittles, K H, 1982. The stratigraphy and structure of the southern Monadhliath Mountains between Loch Killin and Upper Glen Roy. Scottish Journal of Geology, Vol. 18, p. 275 - 290. |
| 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
|
