| Monk's Bay Sandstone | |
| Period: | Albian |
| Type: | Geological formation |
| Prilithology: | Sands |
| Unitof: | Lower Greensand Group |
| Underlies: | Gault Formation |
| Overlies: | Sandrock Formation |
| Thickness: | up to 21.9m (71.9feet), 5 cm in Swanage |
| Region: | England |
| Extent: | Isle of Wight, Dorset |
The Monk's Bay Sandstone, formerly known as the Carstone Formation of the Isle of Wight (or similar) is a geological formation in England, present on the Isle of Wight and marginally in Swanage. Its lithology consists of gritty, reddish-brown sands with pebbles and phosphatic nodules[1]