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. References Geologic formations of England Lower Cretaceous Series of Europe Albian Stage Aptian Stage Sandstone formations Siltstone formations Mudstone formations