Appin Group
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
Ballachulish Subgroup
Lochaber Subgroup
This whole succession reflects alternate periods of deepening and filling of the sedimentary basin.
