| Computer Code: |
DBCM |
Preferred Map Code: |
CMQ |
| Status Code: |
Full |
| Age range: |
Neoproterozoic Era (AZ)
— Neoproterozoic Era (AZ) |
| Lithological Description: |
Massive white pebbly quartzite and rusty gritty psammite, with local pink feldspathic quartzite and calcareous semipelite. |
| Definition of Lower Boundary: |
First appearance of massive pebbly quartzite within 80m transition zone from impure quartzites and semipelites of Killiecrankie Schist Formation. |
| Definition of Upper Boundary: |
Point within transitional sequence where micaceous, graphitic pelite typical of Ben Eagach Schist Formation dominates over quartzite. |
| Thickness: |
0 - 900m in Sheet 55W |
| Geographical Limits: |
From Creag Sparadain [NN 968 653], where it is cut off by the Killiecrankie Slide, southwards via the north side of Beinn Eagagach [NN 855 575] and Carn Mairg [NN 683 515], to Loch Awe [NN 11 26], where it is cut off by the Etive Complex. |
| Parent Unit: |
Easdale Subgroup (DBED)
|
| Previous Name(s): |
Carn Mairg Quartzite [Obsolete Name and Code: Use DBCM]
(-194)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Summit ridge of Carn Mairg from boundary with Killiecrankie Schist (to north) to boundary with Ben Eagach Schist (to south). |
| Reference(s): |
| Bailey, E B, and McCallien, W J. 1937. Perthshire tectonics: Schiehallion to Glen Lyon. Transactions of the Royal Society of Edinburgh, Vol. 59, 79-117. |
| Stephenson, D and Gould, D. 1995. British Regional Geology: the Grampian Highlands (4th edition). (London: HMSO for the British Geological Survey), 67-68. |
| Treagus, J E. 2001. Solid geology of the Schiehallion district. Memoir of the British Geological Survey, Sheet 55W (Scotland). |
| Bailey, E B. 1925. Perthshire tectonics: Loch Tummel, Blair Atholl and Glen Shee. Transactions of the Royal Society of Edinburgh, Vol. 53, 671-698. |
| Barrow, G, Grant Wilson, J S, and Cunningham Craig, E H. 1905. The geology of the country around Blair Atholl, Pitlochry and Aberfeldy. Memoir of the British Geological Survey, Scotland (Sheet 55). |
| Harris, A L, Haselock, P J, Kennedy, M J and Mendum, J R, 1994. The Dalradian Supergroup in Scotland, Shetland and Ireland. 33-53 in Gibbons, W E and Harris, A L (editors). A revised correlation of Precambrian rocks in the British Isles. Special Report of the Geological Society, London, No.22. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S055
S055
S054
S046
S045
S046
S046
|
