Cwm Craig-ddu Quarry: Difference between revisions
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[[File:Scrambling at Corryn - geograph.org.uk - 826217.jpg|thumb|Scrambling at Corryn. The layout of this [[motocross|motorcycle scramble track]] is best seen from the road descending Cwm Craig-ddu. Closer to hand, going across the picture, is the bridleway to [[Fron, Powys|Fron]].]] |
[[File:Scrambling at Corryn - geograph.org.uk - 826217.jpg|thumb|Scrambling at Corryn. The layout of this [[motocross|motorcycle scramble track]] is best seen from the road descending Cwm Craig-ddu. Closer to hand, going across the picture, is the bridleway to [[Fron, Powys|Fron]].]] |
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'''Cwm Craig-ddu Quarry''' is a disused quarry in [[Brecknock]], [[Powys]], [[Wales]]. It has been designated as a [[Site of Special Scientific Interest]] because of the fossils found there, particularly the fossils of the earliest vascular land plant yet discovered.<ref>{{cite web |url=http://www.digitaldan.co.uk/what/sssi.php?county=17 |title=Powys: SSSI and SAC in Powys |work=What's on in Wales |accessdate=28 April 2016}}</ref> |
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'''Cwm Craig-ddu Quarry''' is a [[Site of Special Scientific Interest]] in [[Brecknock]], [[Powys]], [[Wales]]. |
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==The site== |
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Cwm Craig-ddu Quarry is a disused quarry that is now much overgrown with plants and bushes. It is located near the B4519 about one mile south of the village of [[Garth, Powys|Garth]] which is on the main [[A483 road]] between [[Llandovery]] and [[Builth Wells]]. The quarry is up a track with a cattle grid at its foot.<ref name=Fossil>{{cite web |url=https://ukfossils.co.uk/2014/03/22/cwm-craig-ddu/ |title=Cwm Craig ddu |publisher=UK Fossils Network |accessdate=28 April 2016}}</ref> It is thought that Cwm Craig-ddu Quarry yields the fossilised remains of the earliest vascular land plant yet to have been found anywhere in the world.<ref>{{cite journal |author=Edwards, Dianne; Bassett, Michael G.; Rogerson, E. Catherine W. |year=2007 |title=The earliest vascular land plants: continuing the search for proof |journal=Lethaia |volume=12 |issue=4 |pages=313–324 |doi=10.1111/j.1502-3931.1979.tb01017.x }}</ref> |
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==Fossils== |
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Cwm Craig-ddu Quarry is renowned for its [[fossil]]s, particularly of [[Bivalvia|bivalve molluscs]] and plants. Fossils can be found in both the disused quarry and in the rock face of the roadside cutting and other rocky outcrops in the vicinity. The fossils are mostly the preserved remains of small bivalve molluscs and are mainly well-preserved. They can be found when slabs of rock are split, but this site is preserved as a [[Site of Special Scientific Interest]] and the use of hammers is not allowed. There are also remains of primitive vascular land plants at the site, in fact these are believed to be the oldest such fossil plants in Britain. They are all in the [[genus]] ''[[Cooksonia]]'' and are mostly in the quarry itself.<ref name=Fossil/> |
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==Geology== |
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The exposed rocks are [[Silurian]] era [[siltstone]]s from some 420 million years ago and form part of the [[Pterinea Beds]] of the [[Wilsonia Shales Formation]] in the [[Ludlow Group]].<ref name=Fossil/> |
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==References== |
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{{reflist}} |
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==See also== |
==See also== |
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[[Category:Sites of Special Scientific Interest in Brecknock]] |
[[Category:Sites of Special Scientific Interest in Brecknock]] |
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{{Powys-geo-stub}} |
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Revision as of 17:50, 28 April 2016
Cwm Craig-ddu Quarry is a disused quarry in Brecknock, Powys, Wales. It has been designated as a Site of Special Scientific Interest because of the fossils found there, particularly the fossils of the earliest vascular land plant yet discovered.[1]
The site
Cwm Craig-ddu Quarry is a disused quarry that is now much overgrown with plants and bushes. It is located near the B4519 about one mile south of the village of Garth which is on the main A483 road between Llandovery and Builth Wells. The quarry is up a track with a cattle grid at its foot.[2] It is thought that Cwm Craig-ddu Quarry yields the fossilised remains of the earliest vascular land plant yet to have been found anywhere in the world.[3]
Fossils
Cwm Craig-ddu Quarry is renowned for its fossils, particularly of bivalve molluscs and plants. Fossils can be found in both the disused quarry and in the rock face of the roadside cutting and other rocky outcrops in the vicinity. The fossils are mostly the preserved remains of small bivalve molluscs and are mainly well-preserved. They can be found when slabs of rock are split, but this site is preserved as a Site of Special Scientific Interest and the use of hammers is not allowed. There are also remains of primitive vascular land plants at the site, in fact these are believed to be the oldest such fossil plants in Britain. They are all in the genus Cooksonia and are mostly in the quarry itself.[2]
Geology
The exposed rocks are Silurian era siltstones from some 420 million years ago and form part of the Pterinea Beds of the Wilsonia Shales Formation in the Ludlow Group.[2]
References
- ^ "Powys: SSSI and SAC in Powys". What's on in Wales. Retrieved 28 April 2016.
- ^ a b c "Cwm Craig ddu". UK Fossils Network. Retrieved 28 April 2016.
- ^ Edwards, Dianne; Bassett, Michael G.; Rogerson, E. Catherine W. (2007). "The earliest vascular land plants: continuing the search for proof". Lethaia. 12 (4): 313–324. doi:10.1111/j.1502-3931.1979.tb01017.x.
{{cite journal}}: CS1 maint: multiple names: authors list (link)
See also