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.
| 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 |
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
edit- ^ 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".