Appin Group | |
---|---|
Stratigraphic range: Neoproterozoic | |
Type | Group |
Unit of | Dalradian Supergroup |
Sub-units | Lochaber, Ballachulish and Blair Atholl subgroups |
Underlies | Argyll Group |
Overlies | Grampian Group |
Thickness | up to 4km |
Lithology | |
Primary | psammite |
Other | semipelite, quartzite, pelite, schist, limestone, slate |
Location | |
Region | Central Highlands |
Type section | |
Named for | Appin |
The Appin Group is a thick sequence of metamorphosed Neoproterozoic sedimentary rocks that outcrop across the Central Highlands of Scotland, east of the Great Glen. It forms a part of the Dalradian Supergroup.
It is divided into three subgroups each consisting of multiple named formations. In stratigraphic order i.e. youngest at the top, these are:
Blair Atholl Subgroup
- Islay Limestone Formation
- Mullach Dubh Phyllites Formation
- Lismore Limestone Formation
- Cuil Bay Slates Formation
Ballachulish Subgroup
- Appin Phyllite & Limestone Formation
- Appin Quartzite Formation
- Ballachulish Slate Formation
- Ballachulish Limestone Formation
Lochaber Subgroup
- Leven Schist Formation
- Glencoe Quartzite Formation
- Binnein Schist Formation
- Binnein Quartzite Formation
- Eilde Schist Formation
- Eilde Quartzite Formation
This whole succession reflects alternate periods of deepening and filling of the sedimentary basin.[1] [2]
References
- ↑ Strachan, R.A., Harris, A.L., Fettes, D.J. & Smith, M. 2002 The Highland and Grampian Terranes. In: Trewin, N.H. (ed) The Geology of Scotland. The Geological Society, London pp 96-99
- ↑ "BGS Lexicon of Named Rock Units - Result Details".
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