Computer Code: |
CNSS |
Preferred Map Code: |
notEntered |
Status Code: |
Full |
Age range: |
Neoproterozoic Era (AZ)
— Neoproterozoic Era (AZ) |
Lithological Description: |
Dark grey gneissose semipelite composed mainly of muscovite, biotite, quartz, some plagioclase and garnet, with local thin fine-grained biotite-rich and quartoze psammite interbeds. |
Definition of Lower Boundary: |
Top of the predominantly psammite beds belonging to the Creag Dhubh Psammite Formation, below the predominantly semipelitic beds of the Creag na Sanais Semipelitic Formation. |
Definition of Upper Boundary: |
Base of the predominantly psammitic Allt nam Biorag Member, Fara Psammite Formation, above the predominantly semipelitic beds of the Creag na Sanais Semipelite Formation. |
Thickness: |
100 - 200m |
Geographical Limits: |
South of Newtonmore, west of Crubenmore on Sheet 64W |
Parent Unit: |
Glen Spean Subgroup (GRGS)
|
Previous Name(s): |
Part of the Schists within the Moine Series [Obsolete Name and Code: Use CNSS]
(-3315)
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
Type Section |
Outcrops south of Creag na Sanais Leslie, A G. et al., BGS Internal Report IR/03/048 |
Reference(s): |
Leslie, A G, Krabbendam, M and Smith, R A, 2003. Progress Report on the Geology of 1:50 k Sheet 64W (Newtonmore) British Geological Survey Internal Report, IR/03/048. 23pp. |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
none recorded or not applicable |