Cwm Twrch is a

Site of Special Scientific Interest A Site of Special Scientific Interest (SSSI) in Great Britain or an Area of Special Scientific Interest (ASSI) in the Isle of Man and Northern Ireland is a conservation designation denoting a protected area in the United Kingdom and Isle of ...

(SSSI) in

Carmarthenshire Carmarthenshire ( cy, Sir Gaerfyrddin; or informally ') is a county in the south-west of Wales. The three largest towns are Llanelli, Carmarthen and Ammanford. Carmarthen is the county town and administrative centre. The county is known as ...

, Wales.

SSSI

Cwm Twrch SSSI is located on and around the

Afon Twrch The Afon Twrch is a river which rises in the Black Mountain in south Wales. It forms the boundary between the counties of Brecknockshire (currently administered as part of the unitary authority of Powys) and Carmarthenshire and, downstream of ...

approximately north-east of

Ystradowen Ystradowen is a small village twelve miles west of Cardiff, located in the Vale of Glamorgan in south Wales; its nearest town is Cowbridge which is about three miles to the south. The village was served by Ystradowen railway station between 18 ...

, and covers . The site is notable for its geology, where river erosion provides the best exposes the Amman Marine Band, a

sedimentary Sedimentary rocks are types of rock (geology), rock that are formed by the accumulation or deposition of mineral or organic matter, organic particles at Earth#Surface, Earth's surface, followed by cementation (geology), cementation. Sedimentati ...

layer showing a diverse fauna, and which marks the Westphalian A – Westphalian B boundary in this

Carboniferous The Carboniferous ( ) is a geologic period and system of the Paleozoic that spans 60 million years from the end of the Devonian Period million years ago ( Mya), to the beginning of the Permian Period, million years ago. The name ''Carbonifero ...

rock

strata In geology and related fields, a stratum ( : strata) is a layer of rock or sediment characterized by certain lithologic properties or attributes that distinguish it from adjacent layers from which it is separated by visible surfaces known as ei ...

References

{{reflist

External links

SSSI Citation
for Cwm Twrch
Citation map
for Cwm Twrch *
Your Special Site and its Future
' - Cwm Twrch SSSI overview from

Natural Resources Wales Natural Resources Wales ( cy, Cyfoeth Naturiol Cymru) is a Welsh Government sponsored body, which became operational from 1 April 2013, when it took over the management of the natural resources of Wales. It was formed from a merger of the Count ...

Cwm Twrch SSSI
marked on

DEFRA DEFRA may refer to: * Deficit Reduction Act of 1984, United States law * Department for Environment, Food and Rural Affairs, United Kingdom government department {{Disambiguation ...

's MAGIC Map Sites of Special Scientific Interest in Carmarthen & Dinefwr

SSSI

See also

References

External links