| Site of Special Scientific Interest | |
  Location within Carmarthenshire | |
| Location | Carmarthenshire |
|---|---|
| Grid reference | SN333146 |
| Coordinates | 51°48′19″N4°25′03″W / 51.80515°N 4.41739°W |
| Area | 0.04 hectares (0.099 acres) |
| Notification | 1981 |
Coed Cochion Quarry is a Site of Special Scientific Interest (SSSI) in Carmarthenshire, Wales, in which the geology of the site has preserved rare Precambrian fossils. [1] [2]
Coed Cochion Quarry SSSI is a very small quarry of 0.4 hectares (0.99 acres) located approximately 1 mile (1.6 km) south of Llangynog and 1.3 miles (2.1 km) north of Llanybri, north-east of the Taf Estuary. [1] [2]
The site is a rare example in the world of Precambrian fossil records - greater than 0.5 billion years old - found in the ashy siltstone sedimentary rock. A number of fossils of medusoid creatures - visually like, but maybe not in fact contemporary jellyfish - are present, as are feeding trails of other creatures. The evidence is that the site was once a sandy, silty shoreline in which soft-bodied fauna became buried. [2] [3]