Harlech Grits Group
| Harlech Grits Group | |
|---|---|
| Stratigraphic range: early Cambrian | |
Sandstones of the Rhinog Formation, Rhinog Fawr, Snowdonia | |
| Type | Group |
| Sub-units | Gamlan Formation, Barmouth Formation, Hafotty Formation, Rhinog Formation, Llanbedr Formation, Dolwen Formation |
| Underlies | Mawddach Group |
| Overlies | Bryn-teg Volcanic Formation |
| Thickness | about 2,000 m (6,600 ft) |
| Lithology | |
| Primary | sandstones |
| Other | mudstones, siltstones, greywacke |
| Location | |
| Region | Northwest Wales |
| Country | United Kingdom |
| Type section | |
| Named for | Harlech (town) |
The Harlech Grits Group is a lower to middle Cambrian lithostratigraphic group (a sequence of rock strata) in northwest Wales. The name is derived from the town of Harlech in Gwynedd.