Cromhall Quarry
| Site of Special Scientific Interest | |
| Location | Avon |
|---|---|
| Grid reference | ST704916 |
| Interest | Geological |
| Area | 2.7 hectare |
| Notification | 1966 |
| Location map | English Nature |
Cromhall Quarry, also known as Slickstones Quarry, (grid reference ST704916) is a 2.7 hectare flooded former limestone quarry near the village of Cromhall, South Gloucestershire, England notified in 1966.
The quarry is a designated Site of Special Scientific Interest (SSSI) due to its geological and biological significance, which includes the presence of the protected Great Crested Newt (Triturus cristatus). In recent years, the quarry has transitioned into a maritime training facility operated by South West Maritime Academy, while also offering open water swimming, scuba diving, and paddleboarding through The Lake.
The site shows red Triassic rocks from the Magnesian Conglomerate in fissures of older carboniferous limestone from the Friars Point Limestone.
The fossils of two Clevosaurus species, Cryptovaranoides microlanius and Hwiccewyrm trispiculum have been recovered from Slickstones Quarry in 1939 and 1988, 1953, and the 1970s respectively.