Misplaced Pages

#13986

43-495: The basin was complex and consisted, at different times, of a variety of sub-basins separated by blocks across which typically sedimentation continued but resulted in much thinner rock sequences. The term, the ' Pennine Block-and-basin Province ' is frequently used in literature to describe the situation which prevailed particularly during the lower Carboniferous. This article about a specific United Kingdom geological feature

86-569: A unitary authority . At the time of abolition, the rural district covered 114,232 acres (46,228 ha) and had a population at the 1971 census of 15,190. Pwllheli Municipal Borough was the successor to a free borough which was granted a charter by Edward the Black Prince in 1355. The corporation was abolished by the Municipal Corporations Act 1835 , and replaced by an elected council, which existed until Pwllheli

129-574: A bombing school at Penyberth on the peninsula. The events surrounding the protest became known as Tân yn Llŷn ( Fire in Llŷn ). The government had settled on Llŷn as the site for its new bombing school after similar locations in Northumberland and Dorset were met with protests. However, British Prime Minister Stanley Baldwin refused to hear the case against the bombing school in Wales, despite

172-541: A deputation representing half a million Welsh protesters. Protest against the bombing school was summed up by Saunders Lewis when he wrote that the British government was intent upon turning one of the "essential homes of Welsh culture , idiom , and literature " into a place for promoting a barbaric method of warfare. On 8 September 1936 the bombing school building was set on fire by Saunders Lewis, Lewis Valentine and D. J. Williams , who immediately gave themselves up to

215-533: A holiday camp at Penychain , which attracted visitors from the industrial cities of North West England and the West Midlands . As car ownership increased, the tourist industry spread to the countryside and to coastal villages such as Aberdaron, Abersoch, Llanbedrog and Nefyn, where many families supplemented their income by letting out rooms and houses. During the Middle Ages the cantref of Llŷn

258-450: A kingdom separate from his brother Cuneglasus ' kingdom in Rhos . He is credited with having sponsored Saint Cadfan 's monastery on Bardsey Island , which became a major centre of pilgrimage during medieval times. There are numerous wells throughout the peninsula, many dating back to the pre-Christian era. Many have holy connotations and they were important stops for pilgrims heading to

301-400: A legacy of inclines and export docks and were the reason for the growth of villages such as Llithfaen and Trefor . Copper , zinc and lead were mined around Llanengan , while 196,770 long tons (199,930 t) of manganese were produced at Y Rhiw between 1894 and 1945. The Penrhyn Dû Mines have also been extensively mined since the seventeenth century around Abersoch . Shipbuilding

344-477: A new parish of Buan was formed by the merger of Ceidio and Llanfihangel Bachellaeth ; and the parish of Dolbenmaen was transferred from Glaslyn Rural District . Five years later, in 1939, Edern was abolished and incorporated into Nefyn . The rural district was abolished in 1974, with its area being included in the Dwyfor District of Gwynedd, which was itself abolished in 1996 when Gwynedd became

387-522: A part in subsequent orogenic events and be modified by them. Thus lines of crustal weakness commonly associated with, for example, the Caledonian Orogeny will often predate this particular mountain-building period, much as some of those created during this phase were reactivated during later events. The Caledonian Orogeny took place between about 490 and 390 million years ago as the former micro-continent of Avalonia collided obliquely with

430-519: A series of collisions involving various micro-continents between northern Europe and Africa . Its effects are most evident in the Alps , Pyrenees , Carpathians and other mountain ranges of southern Europe , but the northernmost 'ripples' of this event have affected the structure of southern England. Structures include; Lleyn peninsula The Llŷn Peninsula ( Welsh : Penrhyn Llŷn or Pen Llŷn , Welsh pronunciation: [ɬɨːn] )

473-470: Is a stub . You can help Misplaced Pages by expanding it . This article about structural geology is a stub . You can help Misplaced Pages by expanding it . Geological structure of Great Britain#Pennine Block .26 Basin Province The geological structure of Great Britain is complex, resulting as it does from a long and varied geological history spanning more than two billion years. This piece of

SECTION 10

#1732780202014

516-587: Is a peninsula in Gwynedd , Wales, with an area of about 400 km (150 sq mi), and a population of at least 20,000. It extends 30 miles (50 km) into the Irish Sea , and its southern coast is the northern boundary of the Tremadog Bay inlet of Cardigan Bay . The peninsula was a cantref within the medieval kingdom of Gwynedd , and became part of Caernarfonshire from 1284 until that county

559-469: Is complex: the majority is formed from volcanic rocks of the Ordovician period. Rocks of Cambrian origin occur south of Abersoch. Numerous granite intrusions and outcrops of rhyolite form prominent hills such as Yr Eifl, whilst gabbro is found at the west end of Porth Neigwl . The western part of the peninsula (northwest of a line drawn from Nefyn to Aberdaron) is formed from Precambrian rocks,

602-693: Is sometimes spelled Lleyn in English, although this spelling is now less common. The name is thought to be of Irish origin, and to have the same root – Laigin ( Laighin ) in Irish – as the word Leinster and which also occurs in Porth Dinllaen on the north coast. Following the death of Owain Whitetooth ( Owain Danwyn ), king of Gwynedd , Owain's son Saint Einion seems to have ruled Llŷn as

645-588: Is to examine the various terranes from which it is composed. These are essentially continental fragments whose boundaries are generally defined by faults. Individual terranes typically contain suites of structures, the histories and form of which differ from those of neighbouring terranes. The Hebridean Terrane is defined to the east by the Moine Thrust , beyond which lies the Northern Highlands Terrane . This area in turn abuts against

688-898: The Central Highlands (or Grampian) Terrane along the Great Glen Fault . Similarly the Highland Boundary Fault separates the Central Highlands Terrane from the Midland Valley Terrane , which is itself separated from the Central - Southern Uplands Terrane by the Southern Uplands Fault . Each of these terranes form a part of the former continent of Laurentia whose southeastern margin is defined by

731-727: The Iapetus Suture Zone, which runs parallel to the English-Scottish border, though some miles to its south. The Central - Southern Uplands Terrane extends across the northernmost part of England. Its southern margin is the Iapetus Suture, south of which lies the Leinster - Lakesman Terrane which includes the Lake District and North Pennines . The majority of the rest of England and Wales north of

774-559: The Old Red Continent ), followed by a further collision between Gondwana and the enlarged Laurussia. In Britain it resulted in a variety of geological structures across the southwest from Pembrokeshire and South Glamorgan in Wales to Devon and Cornwall . Structures include: An east-west extensional regime affecting the crust of England led to the formation of a series of structural basins developing through England between

817-762: The Rosslare - Monian Terranes . Northern England is characterised by a series of fault-bound blocks separated by sedimentary basins whose origin can be traced back to the Carboniferous period. The North Pennines are formed on the Alston Block which is defined to the west by the Pennine Fault and to the north by the Stublick and Ninety Fathom Faults. It is separated from the Askrigg Block to

860-776: The Variscan Front are considered to constitute the Avalon Composite Terrane . Central to this composite terrane is the triangular-shaped Midlands Microcraton ; within it, the north–south aligned Malvern Line (or 'Malvern Lineament') divides the Wrekin Terrane in the west from the Charnwood Terrane in the east. The Isle of Anglesey and parts of the Lleyn peninsula are deemed to be composed of numerous micro-terranes, known collectively as

903-481: The 1950s onwards, extensive use was made of artificial fertilizers, herbicides and pesticides, leading to drastic changes in the appearance of the landscape. Tourism developed after the railway to Pwllheli was built in 1867. The town expanded rapidly, with several large houses and hotels constructed, and a tramway was built linking the town to Llanbedrog . After the Second World War, Butlins established

SECTION 20

#1732780202014

946-546: The 1960s, a number of Welsh monoglots still lived in the Llŷn Peninsula. However, before 2001 there had been a decline in Welsh speakers in Gwynedd , which includes the Llŷn Peninsula. According to the 2001 census the number of Welsh speakers in Wales increased for the first time in over 100 years, with 20.5 per cent of a population of over 2.9 million claiming fluency in Welsh. The 2001 Census also showed that 73.1 per cent of

989-669: The Earth's crust has experienced several episodes of mountain building or ' orogenies ', each of which has added further complexity to the picture. A wide range of geological structures occur across Britain and include examples at a variety of scales of: Our understanding of Britain's large-scale structure has been gained over many decades by simple geological field survey together with an increasing range of technological methods including gravity surveys , seismic surveys , aeromagnetic surveys and other forms of remote sensing . A useful approach to considering Britain's geological structure

1032-808: The English Channel and the Irish Sea during Permian and Triassic times. The Worcester Basin links to the Stafford Basin which in turn links to the Cheshire Basin and thence to the East Irish Sea Basin. The Needwood and Knowle basins are two smaller basins in the North Midlands associated with this rift complex. The Alpine Orogeny began 200 million years ago and continues to the present day. It comprises

1075-500: The Welsh language. The whole of Llŷn is governed by Cyngor Gwynedd , a unitary authority established in 1996. The area had traditionally formed part of Caernarfonshire , for which an elected county council had been formed in 1889. Caernarfonshire was abolished in 1974 and incorporated into the new county of Gwynedd , which became a unitary authority under the 1996 reorganisation. Llŷn Rural District , based in Pwllheli ,

1118-550: The area an unspoilt image which has made Llŷn a popular destination for both tourists and holiday home owners. Holiday homes remain contentious among locals, many of whom feel they are priced out of the housing market by incomers. From the 1970s to the 1990s, a group known as Meibion Glyndŵr claimed responsibility for several hundred arson attacks on holiday homes using incendiary devices, some of which took place in Llŷn. The Llŷn Area of Outstanding Natural Beauty covers approximately 62 sq mi (160 km ). The name Llŷn

1161-431: The area as the rise in house prices has outpaced average earnings in Wales. On the other hand, there has been an influx of non-Welsh speakers purchasing properties for retirement or holiday homes. The issue of locals being priced out of the local housing market is common to many rural communities throughout Britain, but in Wales the added dimension of language further complicates the issue, as many new residents do not learn

1204-605: The coastline and hills are part of the Llŷn Area of Outstanding Natural Beauty . The Llŷn Coastal Path , a long distance footpath , enables walkers to fully explore both coasts of the peninsula. The peninsula is the original home of the Lleyn breed of sheep . This is a hardy and prolific breed that has become much more prominent over the last 20 years due to its excellent prolificacy and mothering ability. The sheep are white-faced; on average, ewes weigh about 70 kilograms (150 lb) and rams 90 kilograms (200 lb). Until at least

1247-510: The former continent of Laurentia along a line approximating to the modern English-Scottish border. This long drawn-out, multi-phase event resulted in innumerable geological structures, many of which have persisted to the present day and help to shape the landscapes of much of Britain, from South Wales northwards to the Shetland Islands . Key structures include: Each of these structures is aligned northeast - southwest, albeit with

1290-665: The island. The Welsh Triads record regional resistance to Edwin of Northumbria 's incursions into Gwynedd by a regional ruler Belyn ap Cynfelyn and his Gosgordd who were allied with Cadwallon ap Cadfan . In subsequent years Llŷn was raided by vikings , most notably by Olaf in the late 10th century. The most rural parts are characterised by small houses, cottages and individual farms, resembling parts of south west Ireland . There are small compact villages, built of traditional materials. The only large-scale industrial activities were quarrying and mining, which have now largely ceased. The granite quarries of northern Llŷn have left

1333-499: The language , although, as in the rest of North West Wales , many people are concerned that the influx of English speakers is damaging the standing of Welsh and threatening its future as a living community language in the area. The Welsh Language and Heritage Centre of Nant Gwrtheyrn is situated on the north coast. Concern for the Welsh language was ignited in 1936 when the United Kingdom government settled on establishing

Pennine Basin - Misplaced Pages Continue

1376-676: The majority of which are considered to form a part of the Monian Complex and thus to be closely related to the rocks of Anglesey . Numerous faults cut the area and a major shear zone – the Llyn Shear Zone – runs northeast to southwest through the Monian rocks. In 1984 there was an earthquake beneath the peninsula , which measured 5.4 on the Richter scale and was felt in many parts of Ireland and western Britain . The area

1419-460: The more northerly of them trending closer to NNE - SSW. A map or satellite photo readily reveals these major trends. There are hundreds of other lesser faults and folds which follow a similar alignment - a trend known as the Caledonoid trend. The Variscan Orogeny was a complex affair whereby the former micro-continent of Armorica collided with Laurussia (otherwise known as Euramerica or

1462-439: The northern coast consist of steep cliffs and rugged rocks with offshore islands and stacks, while there are more extensive sandy beaches on the southern coast, such as Porth Neigwl and Castellmarch Beach. North of Abersoch a series of sand dunes have developed. The landscape is divided into a patchwork of fields, with the traditional field boundaries, stone walls, hedgerows and cloddiau , a prominent feature. The geology of Llŷn

1505-724: The police and claimed responsibility. The trial at Caernarfon failed to agree on a verdict and the case was sent to the Old Bailey in London. The "Three" were sentenced to nine months imprisonment in Wormwood Scrubs , and on their release they were greeted as heroes by 15,000 people at a pavilion in Caernarfon. The decline in the use of the Welsh language in Llŷn has been attributed to a rise in property prices. Local Welsh speakers are increasingly unable to afford housing in

1548-476: The population of Llŷn could speak Welsh. Additionally, 28 per cent of the population of Wales claimed to understand Welsh. However, the number of Welsh speakers declined in Gwynedd from 72.1 per cent in 1991 to 68.7 per cent in 2001. By 2003, however, a survey of schools showed that just over 94 per cent of children between the ages of 3 and 15 were able to speak Welsh, making Llŷn one of the foremost heartlands of

1591-829: The south by the Stainmore Trough. This latter block, coincident with the Yorkshire Dales , is defined to the west by the Dent Fault and to the south by the Craven Fault System . The Northumberland and Gainsborough Troughs lie to the north and south of these two blocks. Another approach to the study of the geological structure of the area is through consideration of the variety of structures resulting from each of several orogenies (or 'mountain-building' episodes) which have taken place over geological history. Structures originating in one event may play

1634-458: Was abolished for administrative purposes in 1974. It borders Arfon and Eifionydd to the east, but the boundary is vague. Historically, the peninsula was travelled by pilgrims en route to Bardsey Island (Welsh: Ynys Enlli ), and its relative isolation has helped to conserve the Welsh language and culture, for which the locality is now famous. This perceived remoteness from urban life has lent

1677-479: Was created under the Local Government Act 1894 from the area of Pwllheli Rural Sanitary District . At the time it covered 91,449 acres (37,008 hectares) and consisted of 30 civil parishes , although the number was subsequently reduced. At the 1901 census, it had a population of 16,816. Under a County Review Order in 1934, 18 parishes were abolished with their areas distributed among other parishes;

1720-614: Was divided into 3 cymydau , those being Dinllaen, Cafflogion and Cymydmaen, with their respective capitals at Din Llaen, Denio and Neigwl. After the Edwardian Conquest some of these settlements became free boroughs like Denio and other like Neigwl faded into obscurity. Llŷn is an extensive plateau dominated by numerous volcanic hills and mountains. The largest of these is Yr Eifl , although Garn Boduan , Garn Fadrun and Mynydd Rhiw are also distinctive. Large stretches of

1763-514: Was important at Nefyn , Aberdaron , Abersoch and Llanaelhaearn , although the industry collapsed after the introduction of steel ships from 1880. Nefyn was also an important herring port, and most coastal communities fished for crab and lobster . Farming was originally simple and organic but underwent major changes after the Second World War as machines came into widespread use. Land was drained and fields expanded and reseeded. From

Pennine Basin - Misplaced Pages Continue

1806-544: Was included in Dwyfor in 1974, as a result of the Local Government Act 1972 . At the 1841 census Pwllheli had a population of 2,367. By the time of abolition the borough covered 1,211 acres (490 ha) and had a population at the 1961 census of 3,647. Criccieth Urban District was created under the Local Government Act 1894, and covered the area of the former borough, which had been abolished in 1886 by

1849-474: Was overrun by Irish Sea ice during the ice ages and this has left a legacy of boulder clay and of meltwater channels. Llŷn is notable for its large number of protected sites, including a national nature reserve at Cors Geirch , a National Heritage Coastline and a European Marine Special Area of Conservation , and 20 Sites of Special Scientific Interest . The peninsula is home to a rare species of mason bee ( Osmia xanthomelana ), found nowhere else. Much of

#13986