| Dalradian Supergroup | |
|---|---|
| Stratigraphic range: 725–470 Ma | |
 Folded Dalradian phyllites of the Ediacaran to lower Cambrian Ben Ledi Grit Formation, part of the Southern Highland Group | |
| Type | Geological supergroup |
| Sub-units | Grampian Group, Appin Group, Argyll Group, Southern Highland Group, Trossachs Group |
| Underlies | Old Red Sandstone, Highland Border Ophiolite (tectonic contact) |
| Overlies | Loch Ness Supergroup |
| Thickness | >20 km (summing the individual groups) |
| Lithology | |
| Primary | Psammite, quartzite, semipelite, pelite, limestone |
| Other | diamictite |
| Location | |
| Region | Grampian Highlands, Shetland, County Antrim, County Tyrone, County Londonderry, Northern and Western Region |
| Country | Scotland, Northern Ireland, Republic of Ireland |
| Type section | |
| Named for | Dál Riata (Dalriada) |
The Dalradian Supergroup (informally and traditionally the Dalradian) is a stratigraphic unit (a sequence of rock strata) in the lithostratigraphy of the Grampian Highlands of Scotland and in the north and west of Ireland. The diverse assemblage of rocks which constitute the supergroup extend across Scotland from Islay in the west to Fraserburgh in the east and are confined by the Great Glen Fault to the northwest and the Highland Boundary Fault to the southeast. Much of Shetland east of the Walls Boundary Fault is also formed from Dalradian rocks. Dalradian rocks extend across the north of Ireland from County Antrim in the north east to Clifden on the Atlantic coast, although obscured by younger Palaeogene lavas and tuffs or Carboniferous rocks in large sections.