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.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
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