This is a list of the named geological faults affecting the rocks of Wales. 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', notably in South Wales. These linear features are a combination of faults and folds - the relative importance of faulting and folding varying along the length of each disturbance.
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Transcription
Welcome to the United Kingdom (and a whole lot more) explained by me, C. G. P. Grey The United Kingdom, England, Great Britain? Are these three the same place? Are they different places? Do British people secretly laugh those who use the terms wrongly? Who knows the answers to these questions? I do and I'm going to tell you right now. For the lost: this is the world, this is the European continent and this is the place we have to untangle. The area shown in purple is the United Kingdom. Part of the confusion is that the United Kingdom is not a single country but is instead a country of countries. It contains inside of it four co-equal and sovereign nations The first of these is England — shown here in red. England is often confused with the United Kingdom as a whole because it's the largest and most populous of the nations and contains the de facto capital city, London. To the north is Scotland, shown in blue and to the west is wales, shown in white. And, often forgotten even by those who live in the United Kingdom, is Northern Ireland shown in orange. Each country has a local term for the population. While you can call them all 'British' it's not recommended as the four countries generally don't like each other. The Northern Irish, Scottish and Welsh regard the English as slave-driving colonial masters — no matter that all three have their own devolved Parliaments and are allowed to vote on English laws despite the reverse not being true — and the English generally regard the rest as rural yokels who spend too much time with their sheep. However, as the four constituent countries don't have their own passports, they are all British Citizens, like it or not.They are British Citizens of the United Kingdom — whose full name by the way is the United Kingdom of Great Britain and Northern Ireland. So where's Great Britain hiding? Right here: the area covered in black is Great Britain. Unlike England, Scotland, Wales and Northern Ireland, Great Britain is a geographical rather than a political term. Great Britain is the largest island among the British Isles. Within the United Kingdom, the term 'Great Britain' is often used to refer to England, Scotland and Wales alone with the intentional exclusion of Northern Ireland. This is mostly, but not completely true, as all three constituent countries have islands that are not part of Great Britain such as The Isle of Wight, part of England, the Welsh Isle of Anglesey and the Scottish Hebrides, The Shetland Islands, Orkney Islands, Islands of the Clyde. The second biggest island in the British Isles is Ireland. It is worth noting that Ireland is not a country. Like Great Britain, it is a geographical, not political, term. The Island of Ireland contain on it two countries, Northern Ireland — which we have already discussed — and the Republic of Ireland. When people say they are 'Irish' they are referring to the Republic of Ireland which is a separate country from the United Kingdom. However, both the Republic of Ireland and the United Kingdom are members of the European Union even though England often likes to pretend that it's an Island in the mid-atlantic rather than 50km off the cost of France. But that's a story for another time. To review: The two largest islands in the British Isles are Ireland and Great Britain. Ireland has on it two countries — the republic of ireland and northern ireland, while Great Britain (mostly) contains three: England, Scotland and Wales. These last three, when combined with northern Ireland form the United Kingdom. There are still many unanswered questions. Such as, why, when you travel to Canada is there British Royalty on the money? To answer this, we need to talk about Empire. You can't have gone to school in the English-speaking world without having learned that the British Empire once spanned a 1/4th the worlds land and governed nearly a 1/4th its people. While it is easy to remember the part of the empire that broke away violently... We often forget how many nations gained independence through diplomacy, not bloodshed. These want-to-be nations struck a deal with the empire where they continued to recognize the monarchy as the head of state in exchange for a local, autonomous parliament. To understand how they are connected, we need to talk about the crown. Not the physical crown that sits behind glass in the tower of London and earns millions of tourist pounds for the UK but the crown as a complicated legal entity best thought of a a one-man corporation. Who created this corporation? God Did. According to British Tradition all power is vested in God and the monarch is crowned in a Christian ceremony. God however — not wanted to be bothered with micromanagement — conveniently delegates his power to an entity called the crown. While this used to be the physical crown in the tower of london — it evolved over time into a legal corporation sole able to be controlled only by the ruling monarch. It's a useful reminder that the United Kingdom is still technically a theocracy with the reigning monarch acting as both the head of state and the supreme governor of the official state religion: Anglicanism. Such are the oddities that arise when dealing with a 1,000 year-old Monarchy. Back to Canada and the rest. The former colonies that gained their independence through diplomacy and continue to recognize that authority of the crown are known as the Commonwealth Realm. They are, in decreasing order of population: Canada, Australia, Papua New Guinea, New Zealand, Jamaica, The Solomon Islands, Belize, The Bahamas, Barbados, Saint Lucia, Saint Vincent and the Grenadines, Grenada, Antigua and Barbuda, Saint Kitts and Nevis, and Tuvalu. All are independent nations but still recognize the monarchy as the head of state even though it has little real power within their borders. There are three further entities that belong to the crown and these are the Crown Dependencies: he Isle of Man, Jersey, Guernsey. Unlike the Commonwealth Realm, they are not considered independent nations, but are granted local autonomy by the crown and British Citizenship by the United Kingdom — though the UK does reserve the right to over-rule the laws of there local assemblies. Are we all done "now"? Almost, but not quite. There are still a couple of loose threads, such as this place: The tiny city of Gibraltar on the Southern Cost of Spain famous for its rock, its monkeys and for causing diplomatic tension between the United Kingdom and Spain. Or what about the Falkland Islands? Which caused so much tension between the United Kingdom and Argentina that they went to war over them. These places belong in the last group of crown properties know as: British Overseas Territories. But their former name — crown colonies — gives away their origins. They are the last vestiges of the British Empire. Unlike the Commonwealth Realm, they have not become independent nations and continue to rely on the United Kingdom for military and (sometimes) economic assistance. Like the Crown Dependencies, everyone born in their borders is a British Citizen. The Crown colonies are, in decreasing order of population: Bermuda, Cayman Islands,Turks and Caicos Islands, Gibraltar, The British Virgin Islands, Akrotiri and Dhekelia, Anguilla, Saint Helena, Ascension Islands, Tristan da Cunha, Montserrat, British Indian Ocean Territory, South Georgia and the South Sandwich Islands, Falkland Islands, British Antarctic Territory, Pitcairn Islands. For our final Venn diagram, the United Kingdom is a country situated on the British Isles and is part of The Crown which is controlled by the monarchy. Also part of the crown and the British Isles are the crown dependencies. The independent nations of the former empire that still recognize the crown are the Commonwealth Realm and the non-independent remnants of the former empire are the British Overseas Territories. Thank you very much for watching.
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. Conversely 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 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'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.
Alphabetical lists of faults
A
Fault name | OS map ref | County | BGS map sheet | book references |
---|---|---|---|---|
Aber Dinlle Fault | Gwynedd | Brenchley & Rawson 2006 | ||
Aber Fault | Glamorganshire | E&W 248 | ||
Aber Richard Fault | E&W 194; 210 | |||
Aberbeeg Fault | Mem E&W 232 | |||
Aberdaron Fault | Gwynedd | E&W 133 | ||
Abergwesyn Fault | E&W 196, 212 | |||
Abertillery Fault | E&W 249 | Mem E&W 232 | ||
Abertridwr Fault | Glamorganshire | E&W 249 | ||
Acorn Fault | E&W 230 | |||
Afon Banwy Fault | Powys | E&W 150 | ||
Afon Ganol Fault | Clwyd | Mem E&W 95/107 | ||
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 |
B
Fault name | OS map ref | County | BGS map sheet | book references |
---|---|---|---|---|
Bala - Llanelidan Fault | Smith et al. 2005 | |||
Bala Fault | E&W 135; 136 | |||
Bala Fault Zone | UK (south) 625K | |||
Beddgelert Fault | Gwynedd | E&W 119 | ||
Beech Hill Fault | Monmouthshire | Usk-Cwm:25K | ||
Belmont Fault | Clwyd | Mem E&W 95/107 | ||
Benton Fault | Pembrokeshire | E&W 228 | Brenchley & Rawson 2006 | |
Berach Fault | E&W 230 | |||
Berw Fault | Anglesey | Brenchley & Rawson 2006 | ||
Berw Fault Complex | Anglesey | Brenchley & Rawson 2006 | ||
Bethel Fault | Glamorganshire | E&W 247 | ||
Bettws Fault | E&W 230 | |||
Bettws Newydd Fault | Mem E&W 232 | |||
Blaenavon Fault | Monmouthshire | E&W 232 | ||
Blaenhirwaun Thrust | E&W 230 | |||
Blaen Onneu Fault | E&W 232 | |||
Bodafon Thrust | Anglesey | Brenchley & Rawson 2006 | ||
Bodelwyddan Fault | Denbighshire | E&W 95; 107 | Mem E&W 95/107 | |
Box Fault | Glamorganshire | E&W 247 | ||
Bristol Channel Fault Zone | Bristol Channel | |||
Bronnant Fault | Ceredigion | E&W 178; 210; 211 | ||
Bronnant Fault Zone | Ceredigion | E&W 194; 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 | |||
Bryn Rhys Fault | Clwyd | Mem E&W 95/107 | ||
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 | Mem E&W 95/107 |
C
Fault name | OS map ref | County | BGS map sheet | book references |
---|---|---|---|---|
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 | Clwyd | E&W 107 | Mem E&W 95/107 | |
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 | UK (south) 625K | Brenchley & Rawson 2006 | ||
Carreg Maen Taro Fault | E&W 232 | |||
Carrog Valley Fault | Ceredigion | E&W 178 | ||
Cascade Overthrust | E&W 163 | |||
Castell Fault | E&W 163 | Mem E&W 165/151 | ||
Cefn Fault | Clwyd | Mem E&W 95/107 | ||
Cefncynfal Fault | Powys | Mem E&W 165/1051 | ||
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 | E&W 232 | |
Cefnamwlch-Rhiw Fault | Gwynedd | E&W 134 | ||
Ceibwr Bay Fault | 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 | Mem E&W 165/151 | ||
Cilfeigan Fault | Monmouthshire | E&W 249; Usk-Cwm:25K | ||
Claerwen Fault | E&W 179 | |||
Clochaenog Fault | Clwyd | Mem E&W 95/107 | ||
Clwyd Fault | Smith et al. 2005 | |||
Clydach Bridge Fault | Monmouthshire | E&W 232 | ||
Clywedog Fault | E&W 164 | |||
Clytha Fault | E&W 232 | |||
Coalbrook Fault | E&W 230 | |||
Coed Hir Fault | E&W 231 | |||
Coed Ithel Fault | Monmouthshire | Mem E&W 233/250 | ||
Coedycerrig Fault | E&W 232 | |||
Coed-y-paen Fault | Monmouthshire | E&W 249; Usk-Cwm:25K | ||
Conwy Valley Fault/Conway Valley Fault | Gwynedd | E&W 106 | Mem E&W 95/107 | |
Copper Works Fault | Glamorganshire | E&W 247 | ||
Cors-bol Fault | Anglesey | Brenchley & Rawson 2006 | ||
Craig Twrch Fault | E&W 212 | |||
Craiglaseithin Fault | Gwynedd | E&W 135/149 | ||
Craignant - Milton Fault | Smith et al. 2005 | |||
Craignant Fault | Smith et al. 2005 | |||
Craig-y-beri Fault | E&W 137 | |||
Craig-y-glyn Fault | E&W 137 | |||
Creigydd Fault | Monmouthshire | E&W 249; Usk-Cwm:25K | ||
Cribarth Fault | 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 | E&W 230 | |||
Cwm Pennant Fault | 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 | ||
Cwmdockin Fault | Powys | Mem E&W 151/165 | ||
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 references |
---|---|---|---|---|
Daren Ddu Fault | Glamorganshire | E&W 249 | ||
Daron Fault | Gwynedd | E&W 133 | ||
Denbigh Fault | Clwyd | E&W 107 | Mem E&W 95/107 | |
Dinas Fault (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 | Mem E&W 151/165 | ||
Dolwar Fault | Powys | E&W 150 | ||
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 | Mem E&W 95/107 | |
Dyffryn Maelor Fault | Clwyd | Mem E&W 95/107 | ||
Dyfi Valley Fault | Powys | E&W 150 | ||
Dyfnant Fault | Powys | E&W 150 | ||
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 | |||
Dyto Fault | Clwyd | Mem E&W 95/107 |
E
Fault name | OS map ref | County | BGS map sheet | book references |
---|---|---|---|---|
East Llangerniew Fault | Clwyd | E&W 107 | Mem E&W 95/107 | |
Efailnewydd Fault | Gwynedd | E&W 134 | ||
Eglwysbach Fault | Clwyd | Mem E&W 95/107 | ||
Energlyn Fault | Glamorganshire | E&W 249 | ||
Erroxhill Fault | Pembrokeshire | E&W 228 |
F
Fault name | OS map ref | County | BGS map sheet | book references |
---|---|---|---|---|
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 references |
---|---|---|---|---|
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 | Mem E&W 151/165 | ||
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 | Mem E&W 95/107 | |
Gors Fault | Glamorganshire | E&W 230, 247 | ||
Gorsedd Bran Fault | Clwyd | Mem E&W 95/107 | ||
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 | Clwyd | E&W 107 | Mem E&W 95/107 | |
Grovesend Fault | Glamorganshire | E&W 230; 247 | ||
Guilsfield Fault | Powys | E&W 150, 151 | Mem E&W 151/165 | |
Gwaynynog Fault | Clwyd | E&W 107 | Mem E&W 95/107 | |
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 | Mem E&W 95/107 | |
Gyrnos Fault | E&W 231 |
H
Fault name | OS map ref | County | BGS map sheet | book references |
---|---|---|---|---|
Hafan Fault | E&W 163 | |||
Hawarden Fault | E&W 108 | |||
Hendre Fault | E&W 230 | |||
Highgate Fault | Powys | E&W 164; 165 | Mem E&W 151/165 | |
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 |
I,J,K
Fault name | OS map ref | County | BGS map sheet | book references |
---|---|---|---|---|
Itton Fault | Monmouthshire | Mem E&W 233/250 | ||
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 | Mem E&W 95/107 |
L
Fault name | OS map ref | County | BGS map sheet | book references |
---|---|---|---|---|
Leeswood Fault | E&W 108 | |||
Little Mill Fault | E&W 232 | |||
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 | |||
Llanerfyl Fault | Powys | E&W 150 | ||
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 | ||
Llangynidr Fault | Mem E&W 232 | |||
Llanhilleth Fault | Glamorganshire | E&W 249 | ||
Llannefydd Fault | Clwyd | E&W 107 | Mem E&W 95/107 | |
Llanrhaeadr Fault | Clwyd | E&W 107 | Mem E&W 95/107 | |
Llantysilio Fault | E&W 121 | |||
Llanvair Discoed Fault | Monmouthshire | Mem E&W 233/250 | ||
Llanvair Fault | Monmouthshire | E&W 250 | ||
Llanvapley Fault | Mem E&W 232 | |||
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 | Mem E&W 95/107 | |
Longoaks Fault | Glamorganshire | E&W 247 | ||
Lunnon Fault | Glamorganshire | E&W 247 |
M
Fault name | OS map ref | County | BGS map sheet | book references |
---|---|---|---|---|
Maen Fault | Clwyd | Mem E&W 95/107 | ||
Maes-gwyn (or Maes Gwyn) Fault | Clwyd | E&W 107 | Mem E&W 95/107 | |
Marian Ffrith (or Marianffrith) Fault | Flintshire | E&W 95 | Mem E&W 95/107 | |
Mathern Fault | Monmouthshire | Mem E&W 233/250 | ||
Mawddach Fault | E&W 149 | |||
Melai Fault | Clwyd | Mem E&W 95/107 | ||
Menai Strait Fault System | 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 | ||
Montgomery Fault | Powys | Mem E&W 151/165 | ||
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 | |||
Mynydd Bodrochwyn Fault | Clwyd | Mem E&W 95/107 |
N
Fault name | OS map ref | County | BGS map sheet | book references |
---|---|---|---|---|
Nant Cerrig Fault | Clwyd | Mem E&W 95/107 | ||
Nant Dyar Fault | Mem E&W 232 | |||
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 | ||
Newmarket Fault | Clwyd | Mem E&W 95/107 | ||
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 references |
---|---|---|---|---|
Ochr-y-cefn Fault | Clwyd | Mem E&W 95/107 | ||
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 references |
---|---|---|---|---|
Palleg Fault | E&W 230 | |||
Palmer's Lake Overthrusts | Pembrokeshire | E&W 244/5 | ||
Pant Fault | Denbighshire | E&W 95 | Mem E&W 95/107 | |
Pant-y-fotty Fault | Clwyd | Mem E&W 95/107 | ||
Paper Mill Fault | E&W 108 | |||
Parc Postyn Fault | Clwyd | Mem E&W 95/107 | ||
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; 150; 163 | |||
Penrhiwfelen Fault | Glamorganshire | E&W 247 | ||
Penterry Fault | Monmouthshire | Mem E&W 233/250 | ||
Pentre Clwydau Fault | E&W 231 | |||
Pentre Felin Fault | Clwyd | Mem E&W 95/107 | ||
Pentre Llanharan Thrust | Glamorganshire | E&W 248 | ||
Pentremawr Lag Fault | Carmarthenshire | E&W 229 | ||
Pentre Tafarn-y-fedw Fault | Clwyd | Mem E&W 95/107 | ||
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 | |||
Pont-y-ddol Fault | Clwyd | Mem E&W 95/107 | ||
Pontypool Road Fault | Monmouthshire | E&W 232 | ||
Port Eynon Thrust | Glamorganshire | E&W 246 | ||
Portskewett Hill Fault | Mem E&W 233/250 | |||
Prestatyn Fault | Clwyd | E&W 95 | Mem E&W 95/107 | |
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 references |
---|---|---|---|---|
Ramsey Fault | Pembrokeshire | E&W 209 | ||
Rassau Fault | Mem E&W 232 | |||
Reservoir Fault | Monmouthshire | Mem E&W 233/250 | ||
Rhadyr Fault | Monmouthshire | Usk-Cwm:25K | Mem E&W 232 | |
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 | Mem E&W 95/107 | |
Rhydding Fault | Glamorganshire | E&W 230; 247 | ||
Rhyd Sion Wynn Fault | Clwyd | Mem E&W 95/107 | ||
Rhyd-y-creua Fault | Clwyd | Mem E&W 95/107 | ||
Rhymney Fault | Mem E&W 232 | |||
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 references |
---|---|---|---|---|
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 | Mem E&W 95/107 | |
Sirhowy Fault | Monmouthshire | E&W 232 | ||
Six Pit Fault | Glamorganshire | E&W 247 | ||
Soflen Fault | Clwyd | E&W 107 | Mem E&W 95/107 | |
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 references |
---|---|---|---|---|
Tafalog Fault | Powys | E&W 150 | ||
Taipellaf Fault | Clwyd | Mem E&W 95/107 | ||
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 | |||
Ty Mawr Fault | Clwyd | Mem E&W 95/107 | ||
Tyn-y-caeau Fault (Denb) | Denbighshire | E&W 95 | Mem E&W 95/107 | |
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 references |
---|---|---|---|---|
Upper Artro Fault | Merionethshire | E&W 135 | ||
Usk Fault | Monmouthshire | Mem E&W 233/250 | ||
Vale of Clwyd Fault | Denbighshire | E&W 121; 95 | Mem E&W 95/107 | |
Van Fault | E&W 164 |
W,X,Y,Z
Fault name | OS map ref | County | BGS map sheet | book references |
---|---|---|---|---|
Warren Fault | E&W 230 | |||
Welsh Borderland Fault | Smith et al. 2005 | |||
Welsh Borderland Fault System | UK (south) 625K | Brenchley & Rawson 2006 | ||
Wenallt Fault | E&W 164 | |||
Werf Fault | E&W 231 | |||
West Llangerniew Fault | Clwyd | E&W 107 | Mem E&W 95/107 | |
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 | Mem E&W 151/165 |
List of Disturbances
The following named features comprise both faulting and folding;
Disturbance name | OS map ref | County | BGS map sheet | book references |
---|---|---|---|---|
Caerbryn Disturbance | Carmarthenshire | E&W 230 | ||
Carreg Cennen Disturbance | Carmarthenshire | E&W 230 | ||
Clun Forest Disturbance | ||||
Cribarth Disturbance | Powys | E&W 230, 231 | ||
Llandyfaelog Disturbance | Carmarthenshire | E&W 231 | ||
Llannon (or Llanon) Disturbance | Carmarthenshire | E&W 230 | ||
Neath Disturbance | E&W 231 | |||
Pontyclerc Disturbance | Carmarthenshire | E&W 230 | ||
Saron Disturbance | Carmarthenshire | E&W 230 | ||
Trimsaran Disturbance |
See also
- List of geological faults of England
- List of geological faults of Northern Ireland
- List of geological faults of Scotland
- List of geological folds in Great Britain
- Geological structure of Great Britain
References
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
- Barclay, W.J. 1989 Geology of the South Wales Coalfield Part II, the country around Abergavenny, 3rd edition. Mem Br. Geol. Surv. sheet 232 (England and Wales) (Mem E&W 232)
- Brenchley, PJ & Rawson, PF (eds) 2006. The Geology of England and Wales, (2nd edn) The Geological Society, London (Brenchley & Rawson 2006)
- Cave, R. & Hains, B.A, 2001 Geology of the country around Montgomery and the Ordovician rocks of the Shelve area Memoir of the British Geological Survey. Sheet 165 with part of sheet 151 (Welshpool) (England and Wales).(Mem E&W 165/151)
- 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)
- Warren et al. 1984, Geology of the country around Rhyl and Denbigh, Mem Br Geol Svy, sheets 95 and 107 (Mem E&W 95/107)
- 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)