Argyll Group
The Argyll Group is a thick sequence of metamorphosed Neoproterozoic sedimentary rocks that outcrop across the Central Highlands of Scotland, east of the Great Glen, as well as appearing in the north of Ireland. It is a subdivision of the Dalradian Supergroup and is itself divided into four units; from oldest to youngest these are the Islay, Easdale, Crinan and Tayvallich subgroups.
| Argyll Group | |
|---|---|
| Stratigraphic range: Neoproterozoic | |
Folded and metamorphosed limestone of the Boyne Bay Formation of the Tayvallich Subgroup (the upper part of the Argyll Group) in Boyne Bay, Aberdeenshire | |
| Type | Group |
| Unit of | Dalradian Supergroup |
| Sub-units | Islay, Easdale, Crinan and Tayvallich subgroups |
| Underlies | Southern Highland Group |
| Overlies | Appin Group |
| Thickness | up to 9km |
| Lithology | |
| Primary | psammite |
| Other | semipelite, pelite, quartzite, dolomite, conglomerate |
| Location | |
| Region | Scottish Highlands |
| Type section | |
| Named for | Argyll |
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