| Sandrock Formation | |
|---|---|
| Stratigraphic range: | |
| Type | Geological formation |
| Unit of | Lower Greensand Group |
| Underlies | Monk's Bay Sandstone Formation |
| Overlies | Ferruginous Sands |
| Thickness | up to 70 metres (230 ft) |
| Lithology | |
| Primary | Sandstone, siltstone, mudstone |
| Location | |
| Region | Europe |
| Country |  UK |
| Extent | Isle of Wight, Dorset |
 Exposure of the Sandrock Formation on the southern half of the Isle of Wight | |
The Sandrock Formation is a geological formation in England, part of the Lower Greensand Group, it is found on the Isle of Wight and in the northern part of Swanage Bay. It consists of a cyclic rhythm of sandstones, siltstones, and mudstones.[1]