List of geological faults of Wales
Encyclopedia
This is a list of the named geological faults affecting the rocks of Wales
Wales
Wales is a country that is part of the United Kingdom and the island of Great Britain, bordered by England to its east and the Atlantic Ocean and Irish Sea to its west. It has a population of three million, and a total area of 20,779 km²...

. See the main article on faults for a fuller treatment of fault types and nomenclature but in brief, the main types are normal faults, reverse faults, thrusts or thrust faults and strike-slip faults. Many faults may have acted as both normal faults at one time and as reverse or thrust faults at another and may or may not have also incorporated some degree of strike-slip movement too. Fault zones, fault belts and fault complexes typically describe assemblages of faults which have a common origin and history and whose alignments tend to be sub-parallel to one another.

There are also a number of 'disturbances'
Disturbance (geology)
A disturbance is a linear zone of disturbed rock strata stretching for many miles across country which comprises a combination of folding and faulting...

, notably in South Wales
South Wales
South Wales is an area of Wales bordered by England and the Bristol Channel to the east and south, and Mid Wales and West Wales to the north and west. The most densely populated region in the south-west of the United Kingdom, it is home to around 2.1 million people and includes the capital city of...

. These linear features are a combination of faults and folds
Fold (geology)
The term fold is used in geology when one or a stack of originally flat and planar surfaces, such as sedimentary strata, are bent or curved as a result of permanent deformation. Synsedimentary folds are those due to slumping of sedimentary material before it is lithified. Folds in rocks vary in...

 - the relative importance of faulting and folding varying along the length of each disturbance.

Key to tables

  • Column 1 indicates the name of the fault. Note that different authors may use different names for the same fault or a section of it. Coversely the same name may be applied to more than one fault, particularly in the case of smaller faults which are widely separated. Names are as they appear in the literature and do not necessarily conform to the commonly accepted modern spelling or form of the place-names with which they are associated.

  • Column 2 indicates the OS grid reference of the approximate midpoint of certain faults. Note that the mapped extent of a fault may not accurately reflect its actual extent.

  • Column 3 indicates the county
    County
    A county is a jurisdiction of local government in certain modern nations. Historically in mainland Europe, the original French term, comté, and its equivalents in other languages denoted a jurisdiction under the sovereignty of a count A county is a jurisdiction of local government in certain...

     in which the fault occurs. Some traverse two or more counties of course.

  • Column 4 indicates on which sheet, if any, of the British Geological Survey
    British Geological Survey
    The British Geological Survey is a partly publicly funded body which aims to advance geoscientific knowledge of the United Kingdom landmass and its continental shelf by means of systematic surveying, monitoring and research. The BGS headquarters are in Keyworth, Nottinghamshire, but other centres...

    's 1:50,000 / 1" scale geological map series of England and Wales, the fault is shown and named (either on map/s or cross-section/s or both). Also listed are a handful of BGS maps at other scales, where the fault is both shown and named.

  • Column 5 indicates a selection of publications in which references to the fault may be found. See references section for full details of publication.

A

Fault name OS map ref County BGS map sheet book reference/s
Aber Dinlle Fault
Aber Dinlle Fault
The Aber Dinlle Fault is a SW-NE trending fault in North Wales. It forms part of the Menai Strait Fault System, with the Berw and Dinorwic Faults. It lies close to the epicentre of the 1984 Llŷn Peninsula earthquake, although it is not thought to have been responsible for that event. The fault was...

Gwynedd Brenchley & Rawson 2006
Aber Fault Glamorganshire E&W 248
Aber Richard Fault E&W 194; 210
Aberdaron Fault Gwynedd E&W 133
Abergwesyn Fault E&W 196, 212
Abertridwr Fault Glamorganshire E&W 249
Acorn Fault E&W 230
Afon Saint Fault Gwynedd E&W 133
Allt y Crib Fault E&W 163
Allt y Grug Fault E&W 230
Alyn Valley Fault E&W 108
Anafon Fault Gwynedd E&W 106
Arthog - Caerdeon Fault E&W 149
Axton Fault Flintshire E&W 96
Bala - Llanelidan Fault Smith et al. 2005

B

Fault name OS map ref County BGS map sheet book reference/s
Bala Fault
Bala Fault
Bala Fault is a SW-NE trending geological fault in Wales that extends offshore into Cardigan Bay. In the offshore area it is a major normal fault and forms the bounding structure to the Cardigan Bay Basin, with a fill including about 2500 m of Lias Group. At its northeastern end it links to the...

E&W 135; 136
Bala Fault Zone UK (south) 625K
Beddgelert Fault
Beddgelert Fault
Beddgelert Fault is a SW-NE trending volcanotectonic fault in North Wales that formed part of a graben system within the collapsed Snowdon caldera structure. It was a focus for later felsic intrusions and hydrothermal activity....

Gwynedd E&W 119
Beech Hill Fault Monmouthshire Usk-Cwm:25K
Benton Fault
Benton Fault
Benton Fault is a geological fault in southern Pembrokeshire in Wales that was active as a normal fault during the deposition of the Devonian Old Red Sandstone, forming a thick half graben. During the Carboniferous, the Benton Fault was strongly inverted as part of the Variscan Orogeny....

Pembrokeshire E&W 228 Brenchley & Rawson 2006
Berach Fault E&W 230
Berw Fault
Berw Fault
The Berw Fault is a SW-NE trending fault in North Wales. It forms part of the Menai Straits fault System, with the Dinorwic Fault and the Aber Dinlle Fault. It has a long history of movement with early ductile fabrics preserved from a sinistral strike-slip sense shear zone active at the end of the...

Anglesey Brenchley & Rawson 2006
Berw Fault Complex Anglesey Brenchley & Rawson 2006
Bethel Fault Glamorganshire E&W 247
Bettws Fault E&W 230
Blaenavon Fault Monmouthshire E&W 232
Blaenhirwaun Thrust E&W 230
Bodafon Thrust Anglesey Brenchley & Rawson 2006
Bodelwyddan Fault Denbighshire E&W 95; 107
Box Fault Glamorganshire E&W 247
Bristol Channel Fault Zone
Bristol Channel Fault Zone
Bristol Channel Fault Zone is a geological fault in Wales, it is an inverted basin...

Bristol Channel
Bronnant Fault E&W 210; 211
Bronnant Fault Zone E&W 195
Brothers Fault Glamorganshire E&W 247
Brwynd Overthrust E&W 163
Bryn Eglwys Fault E&W 120 Brenchley & Rawson 2006
Bryn Morgan Thrust E&W 230
Bryn Posteg Fault E&W 164
Brynderi Fault Monmouthshire Mem E&W 233/250
Bryneglwys Fault E&W 121
Bryngwili Fault E&W 230
Bryngwyn Fault Glamorganshire E&W 230; 247
Bryn-y-maen Fault Denbighshire E&W 95
Bwlchgwyn Fault E&W 108
Bylchau Fault Denbighshire E&W 107

C

Fault name OS map ref County BGS map sheet book reference/s
Cae Parc Fault Glamorganshire E&W 247
Caerdeon Bodlyn Fault Merionethshire E&W 135
Caergwrle Fault E&W 108
Caerleon Fault Monmouthshire E&W 249; Usk-Cwm:25K
Caerphilly Fault Glamorganshire E&W 249
Camdwr Fault E&W 163
Capel Garmon Fault E&W 107
Cardigan - Fishguard Fault Belt Pembrokeshire E&W 210
Carmel Fault (Powys) Powys E&W 179
Carmel Fault (Carmarthenshire) Carmarthenshire E&W 230
Carmel Head Thrust
Carmel Head Thrust
Carmel Head Thrust is a geological fault on the northern part of the island of Anglesey in North Wales, where rocks of the Precambrian Mona Complex are thrust over Lower Paleozoic sedimentary rocks....

UK (south) 625K Brenchley & Rawson 2006
Carrog Valley Fault Ceredigion E&W 178
Cascade Overthrust E&W 163
Castell Fault E&W 163
Cefn Bryn Thrust Glamorganshire E&W 246
Cefn Crib Fault Glamorganshire E&W 249
Cefn Fault E&W 107
Cefn Garw Fault Monmouthshire Mem E&W 233/250
Cefn Ila Fault Monmouthshire Usk-Cwm:25K
Cefnamwlch-Rhiw Fault Gwynedd E&W 134
Ceibwr Bay Fault
Ceibwr Bay Fault
The Ceibwr Bay Fault is a WSW-ENE trending fault zone that cuts Ordovician rocks of the Ashgill Nantmel Mudstones Formation and the Caradoc Dinas Island Formation. The fault is exposed on the south side of Cardigan Bay in Wales and forms part of the Fishguard-Cardigan Fault Zone. It extends from...

E&W 193
Ceidio Fault Anglesey Brenchley & Rawson 2006
Ceunant Fault E&W 149
Chapel Fault E&W 231
Chepstow Fault Monmouthshire Mem E&W 233/250
Church Stretton Fault System Brenchley & Rawson 2006
Church Stretton Fault Zone E&W 213
Cilfeigan Fault Monmouthshire E&W 249; Usk-Cwm:25K
Claerwen Fault
Claerwen Fault
The Claerwen Fault is a major SW-NE trending fault in central Wales. It was active as a normal fault during deposition of Late Ordovician to mid-Silurian sedimentary rocks, downthrowing to the northwest. The estimated throw on the fault increases from about 100 m at a shallow level to about 1000 m...

E&W 179
Clwyd Fault Smith et al. 2005
Clydach Bridge Fault Monmouthshire E&W 232
Clywedog Fault E&W 164
Coalbrook Fault E&W 230
Coed Hir Fault E&W 231
Coed Ithel Fault Monmouthshire Mem E&W 233/250
Coed-y-paen Fault Monmouthshire E&W 249; Usk-Cwm:25K
Conwy Valley Fault Gwynedd E&W 106
Copper Works Fault Glamorganshire E&W 247
Cors-bol Fault Anglesey Brenchley & Rawson 2006
Craig Twrch Fault E&W 212
Craignant - Milton Fault Smith et al. 2005
Craignant Fault Smith et al. 2005
Craig-y-beri Fault E&W 137
E&W 137
Creigydd Fault Monmouthshire E&W 249; Usk-Cwm:25K
Cribarth Fault
Cribarth Disturbance
The Cribarth Disturbance is a geological structure forming a lineament which stretches across south Wales from Swansea up the Swansea Valley then northeastwards to Brecon and beyond. It comprises both a series of faults and associated folds which were active during the mountain-building period...

E&W 213
Crick Fault Monmouthshire Mem E&W 233/250
Cross Ash Fault Monmouthshire Mem E&W 233/250
Crychan Fault Powys E&W 196, 213
Crychan Fault Belt E&W 213
Cwm Cayo Brook Fault Monmouthshire Mem E&W 233/250
Cwm Cynnen Fault E&W 211
Cwm Dockin Fault E&W 165
Cwm Dwfnant Fault E&W 196
Cwm Earl Fault E&W 165
Cwm Felin Fault Glamorganshire E&W 247
Cwm Llwyd Fault
Cwm Llwyd Fault
The Cwm Llwyd Fault is a fault in the Black Mountains of South Wales. It moved as a sinistral strike-slip fault during the Variscan Orogeny. Together with the Llwyn Celyn Fault it formed a left-stepping offset that created a pull apart structure, which preserved the Cwm Llwyd Outlier of Namurian...

E&W 230
Cwm Pennant Fault
Cwm Pennant Fault
The Cwm Pennant Fault is a SSW-NNE trending normal fault system in North Wales. It forms part of the structures that bound the Snowdon graben. The main faults of the Cwm Pennant fault system throw down to the east....

Brenchley & Rawson 2006
Cwm Pit Fault Glamorganshire E&W 247
Cwm Sylwi Fault E&W 149; 163
Cwmcarvan Fault Monmouthshire Mem E&W 233/250
Cwm-dows Fault Glamorganshire E&W 249
Cwmgwineu Fault Glamorganshire E&W 247
Cwmllynfell Fault E&W 230
Cwm-Mawr Fault E&W 196
Cwmmawr Thrust E&W 230
Cwmneol Faul E&W 231
Cymmer Fault Glamorganshire E&W 248
Cynheidre Thrust E&W 230
Cynllaith Fault E&W 137

D

Fault name OS map ref County BGS map sheet book reference/s
Daren Ddu Fault Glamorganshire E&W 249
Daron Fault Gwynedd E&W 133
Denbigh Fault E&W 107
Dinas Fault
Neath Disturbance
The Neath Disturbance is a geological structure which stretches across south Wales from Swansea Bay northeastwards as far as Hereford in western England. It comprises a series of both faults and associated folds which were active during the mountain-building period known as the Variscan orogeny...

 (Powys)
Powys E&W 231
Dinas Fault (Glams) Glamorganshire E&W 248
Dinorwic Fault Gwynedd E&W 106
Dip Fach Fault E&W 231
Dolforwyn Fault E&W 165
Dowlais Fault (Mons) Monmouthshire E&W 231; 232
Dowlais Fault (Glams) Glamorganshire E&W 249
Duffryn Fault Glamorganshire E&W 230, 247
Dulas Fault E&W 196
Dulas Gap Fault Denbighshire E&W 95; 107
Dyfngwm Fault E&W 164
Dylife Esgairgaled Fault E&W 164
Dylife Fault E&W 164
Dynant Fault E&W 230
Dysynni Fault E&W 149

E

Fault name OS map ref County BGS map sheet book reference/s
East Llangerniew Fault E&W 107
Efailnewydd Fault Gwynedd E&W 134
Energlyn Fault Glamorganshire E&W 249
Erroxhill Fault Pembrokeshire E&W 228

F

Fault name OS map ref County BGS map sheet book reference/s
Felin Arw Fault Glamorganshire E&W 248
Ferry Fault Glamorganshire E&W 247
Flint Fault E&W 108
Forge Overthrust E&W 149; 163

G

Fault name OS map ref County BGS map sheet book reference/s
Gadlys Fault Glamorganshire
E&W 231; 248
Gardeners Fault Glamorganshire E&W 230; 247
Garth - Llanwrtyd Fault Belt E&W 212
Garth Fault E&W 196, 213
Garth Ferry Fault Anglesey Brenchley & Rawson 2006
Garth Hill Overthrust Glamorganshire E&W 249
Gelli Fault Glamorganshire E&W 249
Gelligaer Fault Glamorganshire E&W 249
Gelli-goch Overthrust E&W 149; 163
Giant's Grave Fault Glamorganshire E&W 247
Glan Hafren Fault E&W 165
Glanalders Fault E&W 179
Glandyfi Fault E&W 163
Glaslyn Valley Fault Brenchley & Rawson 2006
Glyn Ceiriog Fault E&W 121
Glyn Fault Monmouthshire E&W 249; Usk-Cwm:25K
Glyn Valley Fault E&W 135
Glyn Wallis Fault E&W 230
Glyncorrwg Fault Glamorganshire E&W 231; 248
Gnoll Fault Glamorganshire E&W 247
Gop Fault Flintshire E&W 95
Gors Fault Glamorganshire E&W 230, 247
Gorseinon Fault Glamorganshire E&W 247
Great Ewloe Fault E&W 108
Greenland Fault Monmouthshire E&W 232
Gresford Fault E&W 121
Grib Fault E&W 230
Groes Fault E&W 107
Grovesend Fault Glamorganshire E&W 230; 247
Guilsfield Fault Powys E&W 151
Gwaynynog Fault E&W 107
Gwern-ddu Fault Monmouthshire Mem E&W 233/250
Gwespyr Fault Flintshire E&W 96
Gwili Fault Glamorganshire E&W 230, 247
Gwrych Castle Fault Denbighshire E&W 95; 107
Gyrnos Fault E&W 231

H

Fault name OS map ref County BGS map sheet book reference/s
Hafan Fault E&W 163
Hawarden Fault E&W 108
Hendre Fault E&W 230
Highgate Fault E&W 164; 165
Hirwaun No 1 Fault E&W 231
Hirwaun No 2 Fault E&W 231
Hirwaun No 2a Fault E&W 231
Hirwaun No 3 Fault E&W 231
Hudnalls Fault Monmouthshire Mem E&W 233/250
Itton Fault Monmouthshire Mem E&W 233/250

I,J,K

Fault name OS map ref County BGS map sheet book reference/s
John Grey's Fault Glamorganshire E&W 247
Keepers Lodge Fault E&W 230
Kilkenny Fault Glamorganshire E&W 231; 249
King's Wood Fault Monmouthshire Mem E&W 233/250
Kinmel Park Fault Denbighshire E&W 95

L

Fault name OS map ref County BGS map sheet book reference/s
Leeswood Fault E&W 108
Llanbadoc Fault Monmouthshire E&W 232; Usk-Cwm:25K
Llancayo Fault Monmouthshire E&W 233 Mem E&W 233/250
Llandrindod - Pen-y-waun Fault Belt E&W 213
Llandyfan Fault E&W 230
Llandynan Fault E&W 121
Llanegryn Fault E&W 149
Llanelidan Fault E&W 121
Llanerchyraur Fault E&W 164
Llanfabon Fault Glamorganshire E&W 231; 249
Llanfrechfa Fault Monmouthshire E&W 249; Usk-Cwm:25K
Llangattock Fault Mem E&W 233/250
Llanglydwen Fault E&W 210; 211
Llangollen - Llantysilio - Aqueduct Fault Smith et al. 2005
Llangollen Fault E&W 121
Llangwm Fault Monmouthshire Mem E&W 233/250
Llanhilleth Fault Glamorganshire E&W 249
Llannefydd Fault E&W 107
Llanrhaeadr Fault E&W 107
Llantysilio Fault E&W 121
Llanvair Discoed Fault Monmouthshire Mem E&W 233/250
Llanvair Fault Monmouthshire E&W 250
Llanvihangel Fault Monmouthshire Mem E&W 233/250
Llanwonno Fault Glamorganshire E&W 248
Llanwrtyd Fault E&W 196
Llanwrtyd Fault E&W 213
Llechwedd Fault E&W 164
Llethir Fault E&W 230
Llety Wilws Fault E&W 230
Llwyn Celyn Fault E&W 230
Llwyn Fault E&W 165
Llyfnant Fault E&W 163
Llysfaen Fault Denbighshire E&W 95
Longoaks Fault Glamorganshire E&W 247
Lunnon Fault Glamorganshire E&W 247

M

Fault name OS map ref County BGS map sheet book reference/s
Maes-gwyn Fault E&W 107
Marian Ffrith Fault Flintshire E&W 95
Mathern Fault Monmouthshire Mem E&W 233/250
Mawddach Fault E&W 149
Menai Strait Fault System
Menai Strait
The Menai Strait is a narrow stretch of shallow tidal water about long, which separates the island of Anglesey from the mainland of Wales.The strait is bridged in two places - the main A5 road is carried over the strait by Thomas Telford's elegant iron suspension bridge, the first of its kind,...

Brenchley & Rawson 2006
Merthyr Church Fault Glamorganshire E&W 231; 249
Meusydd Fault E&W 230
Minera Fault Belt E&W 121
Minffordd Fault Brenchley & Rawson 2006
Mochras Fault Merionethshire E&W 135; 49 Brenchley & Rawson 2006
Moelfre Fault Merionethshire E&W 135
Moel-Gilau Fault Glamorganshire E&W 248
Morfa Fault Glamorganshire E&W 247, 248
Morlais Fault Glamorganshire E&W 247
Mount Pleasant Fault E&W 230
Mynydd Bach Fault E&W 195

N

Fault name OS map ref County BGS map sheet book reference/s
Nant Marl Fault E&W 230
Nant y Fedw Fault E&W 196
Nant-Figillt Fault E&W 108
Nantmor Fault Gwynedd E&W 119
Nantygwrdy Fault E&W 164
Nantyricket Fault E&W 164
Nedern Fault Monmouthshire Mem E&W 233/250
Nercwys - Nant-Figillt Fault Zone E&W 108
New House Thrust E&W 165
Newcastle Fault Monmouthshire Mem E&W 233/250
Newlands Thrust Glamorganshire E&W 247, 248
Newton Fault Glamorganshire E&W 247
Newmarket Fault Flintshire E&W 95
Newport Sands Fault E&W 193; 210
Nicholaston Fault Glamorganshire E&W 247

O

Fault name OS map ref County BGS map sheet book reference/s
Ogof Cadno Fault E&W 193
Ogof Fault E&W 163
Olway Brook Fault Monmouthshire Mem E&W 233/250

P,Q

Fault name OS map ref County BGS map sheet book reference/s
Palleg Fault E&W 230
Palmer's Lake Overthrusts Pembrokeshire E&W 244/5
Pant Fault Denbighshire E&W 95
Paper Mill Fault E&W 108
Pared Fault Gwynedd E&W 133
Parwyd Fault Gwynedd E&W 133
Pendaren Fault Glamorganshire E&W 249
Penffordd Fault Pembrokeshire E&W 210
Pengam Fault Glamorganshire E&W 249
Pennal Fault E&W 149; 163
Penrhiwfelen Fault Glamorganshire E&W 247
Penterry Fault Monmouthshire Mem E&W 233/250
Pentre Clwydau Fault E&W 231
Pentre Llanharan Thrust Glamorganshire E&W 248
Pentremawr Lag Fault Carmarthenshire E&W 229
Pentwyn Fault (Mons) Monmouthshire E&W 249
Pentwyn Fault (Glams) Glamorganshire E&W 249
Pen-y-castell Fault Glamorganshire E&W 231, 248
Penydarren Fault E&W 231
Pen-y-Fan Fault Monmouthshire E&W 232
Pen-y-llan Fault Monmouthshire E&W 249; Usk-Cwm:25K
Pen-y-parc Fault Monmouthshire E&W 249; Usk-Cwm:25K
Plas Isaf Fault Glamorganshire E&W 247
Pont Morlais Fault E&W 230
Pontarsais Fault E&W 212
Pontypool Road Fault Monmouthshire E&W 232
Port Eynon Thrust Glamorganshire E&W 246
Portskewett Hill Fault Mem E&W 233/250
Prestatyn Fault E&W 95
Pwllau Bach Fault E&W 231
Pwllmawr Fault Glamorganshire E&W 247
Pwll-meyric Fault Monmouthshire Mem E&W 233/250

R

Fault name OS map ref County BGS map sheet book reference/s
Ramsey Fault Pembrokeshire E&W 209
Reservoir Fault Monmouthshire Mem E&W 233/250
Rhadyr Fault Monmouthshire Usk-Cwm:25K
Rhaiadr Fault E&W 137
Rhiw Fault Glamorganshire E&W 249
Rhiw Gwraidd Fault E&W 179
Rhobell Fracture Brenchley & Rawson 2006
Rhos Fault Glamorganshire E&W 231; 232; 249
Rhuallt Fault Flintshire E&W 95
Rhydding Fault Glamorganshire E&W 230; 247
Ritec Fault Pembrokeshire Brenchley & Rawson 2006
Road Uchaf Fault? Brenchley & Rawson 2006
Rock Park Fault E&W 196
Rockfield Fault Monmouthshire Mem E&W 233/250

S

Fault name OS map ref County BGS map sheet book reference/s
Sarn-Abersoch Thrust Gwynedd E&W 134
Sawdde Fault E&W 212
Severn Valley Fault Belt E&W 151 Toghill P. 2006
Siamber Wen Fault Denbighshire E&W 95; 107
Sirhowy Fault Monmouthshire E&W 232
Six Pit Fault Glamorganshire E&W 247
Soflen Fault E&W 107
Soughton Fault E&W 108
St Arvans Fault Monmouthshire Mem E&W 233/250
St Brides Fault Monmouthshire Mem E&W 233/250
Stradey Fault Carmarthenshire E&W 229
Strumble Head Fault Pembrokeshire E&W 210
Swansea Fault Glamorganshire E&W 247
Swansea Valley Fault E&W 213
Syddyn Fault Carmarthenshire E&W 229

T

Fault name OS map ref County BGS map sheet book reference/s
Talgarth Fault Monmouthshire Mem E&W 233/250
Tal-y-coed Fault Monmouthshire Mem E&W 233/250
Tal-y-llyn Fault E&W 149
Tanant Fault E&W 137
Teifi Fault E&W 212
Tintern Fault Monmouthshire Mem E&W 233/250
Tirdonkin Fault Glamorganshire E&W 247
Tonfannau Fault E&W 149
Trafle Fault Glamorganshire E&W 247
Trawsfynydd - Cwm Bowyd Fault Brenchley & Rawson 2006
Trawsfynydd Fault MW&M:250K, E&W 135
Tredegar Fault Monmouthshire E&W 231; 232
Tre-fal-du Fault Monmouthshire Mem E&W 233/250
Trelleck Common Fault Monmouthshire Mem E&W 233/250
Trelleck Fault Monmouthshire Mem E&W 233/250
Tremadog Thrust Zone Brenchley & Rawson 2006
Tre-'r-ddol Fault E&W 163
Trevethin Fault Glamorganshire, Monmouthshire E&W 232; 249
Trinant Fault Glamorganshire E&W 249
Tumble Fault E&W 230
Tweedle Fault E&W 231
Twrch Fechan Fault E&W 230
Twyn Sych Fault E&W 231
Ty Llwyd Fault E&W 230
Tyn-y-caeau Fault (Denb) Denbighshire E&W 95
Ty'n-y-caeau Fault (Mons) Monmouthshire E&W 249; Usk-Cwm:25K

U,V

Fault name OS map ref County BGS map sheet book reference/s
Upper Artro Fault Merionethshire E&W 135
Usk Fault Monmouthshire Mem E&W 233/250
Vale of Clwyd Fault Denbighshire E&W 121; 95
Van Fault E&W 164

W,X,Y,Z

Fault name OS map ref County BGS map sheet book reference/s
Warren Fault E&W 230
Welsh Borderland Fault
Welsh Borderland Fault System
The Welsh Borderland Fault System is a zone of faulting and associated folding which runs northeastwards through Wales from Pembrokeshire through Carmarthenshire and Powys into Shropshire in England...

Smith et al. 2005
Welsh Borderland Fault System
Welsh Borderland Fault System
The Welsh Borderland Fault System is a zone of faulting and associated folding which runs northeastwards through Wales from Pembrokeshire through Carmarthenshire and Powys into Shropshire in England...

UK (south) 625K Brenchley & Rawson 2006
Wenallt Fault E&W 164
Werf Fault E&W 231
West Llangerniew Fault E&W 107
Weston Madoc Fault E&W 165
Wonastow Fault Monmouthshire Mem E&W 233/250
Wrexham Fault E&W 121
Yspytty Ifan Fault E&W 120
Ystwyth Fault E&W 179

List of Disturbances

The following named features comprise both faulting and folding;
table of named disturbances
Disturbance name OS map ref County BGS map sheet book reference/s
Caerbryn Disturbance Carmarthenshire E&W 230
Carreg Cennen Disturbance
Carreg Cennen Disturbance
The Carreg Cennen Disturbance is a zone of geological faults and folds in south and mid Wales which forms a part of both the Church Stretton Fault Zone and the Welsh Borderlands Fault System...

Carmarthenshire E&W 230
Clun Forest Disturbance
Cribarth Disturbance
Cribarth Disturbance
The Cribarth Disturbance is a geological structure forming a lineament which stretches across south Wales from Swansea up the Swansea Valley then northeastwards to Brecon and beyond. It comprises both a series of faults and associated folds which were active during the mountain-building period...

Powys E&W 230, 231
Llandyfaelog Disturbance Carmarthenshire E&W 231
Llannon (or Llanon) Disturbance Carmarthenshire E&W 230
Neath Disturbance
Neath Disturbance
The Neath Disturbance is a geological structure which stretches across south Wales from Swansea Bay northeastwards as far as Hereford in western England. It comprises a series of both faults and associated folds which were active during the mountain-building period known as the Variscan orogeny...

E&W 231
Pontyclerc Disturbance Carmarthenshire E&W 230
Saron Disturbance Carmarthenshire E&W 230
Trimsaran Disturbance

Maps

  • 1:625,000 scale geological map 2007, Bedrock Geology UK South, British Geological Survey, Keyworth, Notts (UK (south) 625K)
  • 1:250,000 scale geological map Mid Wales and the Marches, British Geological Survey, Keyworth, Notts (MW & M 250K)
  • various of 1:50,000 scale geological maps of England and Wales, British Geological Survey, Keyworth, Notts (E & W no.)
  • 1:25,000 scale sheet Usk - Cwmbran in Classic Areas of British Geology series, British Geological Survey, Keyworth, Notts (Usk-Cwm: 25K)

Books

  • Brenchley, PJ & Rawson, PF (eds) 2006. The Geology of England and Wales, (2nd edn) The Geological Society, London (Brenchley & Rawson 2006)
  • Smith et al. 2005 Structure & Evolution of the south-west Pennine Basin and adjacent area. Subsurface memoir of the British Geological Survey. (Smith et al. 2005)
  • Toghill, P 2006 Geology of Shropshire (2nd edn) Crowood Press, Wilts (Toghill P 2006)
  • Welch, FBA & Trotter, FM 1961 Geology of the Country around Monmouth and Chepstow, HMSO (explanation of 1" geol. sheets 233 & 250 (England and Wales) (Welch, FBA & Trotter, FM 1961)


See also

The source of this article is wikipedia, the free encyclopedia.  The text of this article is licensed under the GFDL.
 
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