Site of Special Scientific Interest | |
Location | Carmarthenshire |
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Grid reference | SN424084 |
Coordinates | 51°47′58″N 3°48′12″W / 51.79933°N 3.80342°W |
Area | 2.4 hectares (0.02400 km2; 0.009266 sq mi) |
Notification | 1988 |
Cwm Twrch is a Site of Special Scientific Interest (SSSI) in Carmarthenshire, Wales. [1] [2]
Cwm Twrch SSSI is located on and around the Afon Twrch approximately 0.9 miles (1.4 km) north-east of Ystradowen, and covers 2.4 hectares (5.9 acres). [1] [2]
The site is notable for its geology, where river erosion provides the best exposes the Amman Marine Band, a sedimentary layer showing a diverse fauna, and which marks the Westphalian A – Westphalian B boundary in this Carboniferous rock strata. [2]