The Jurassic ( / dʒ ʊ ˈ r æ s ɪ k / juurr- ASS -ik ) is a geologic period and stratigraphic system that spanned from the end of the Triassic Period 201.4 million years ago (Mya) to the beginning of the Cretaceous Period, approximately 145 Mya. The Jurassic constitutes the middle period of the Mesozoic Era as well as the eighth period of the Phanerozoic Eon and is named after the Jura Mountains , where limestone strata from the period were first identified.
133-532: Talaton is a village and a civil parish in the English county of Devon . It lies approximately 6 miles to the west of Honiton, 3 miles to the north of Ottery St Mary, 2 miles to the west of Feniton and 2 miles to the east of Whimple . The parish covers an area of 965 hectares (2,384 acres). The parish population was estimated to be 590 in 2012. The name Talaton ( Taletone in Domesday Book , 1086) means 'farmstead on
266-683: A 70 km diameter impact structure buried beneath the Kalahari desert in northern South Africa. The impact is dated to the Tithonian, approximately 146.06 ± 0.16 Mya. Another major structure is the Puchezh-Katunki crater , 40 kilometres in diameter, buried beneath Nizhny Novgorod Oblast in western Russia. The impact has been dated to the Sinemurian, 195.9 ± 1.0 Ma. At the beginning of the Jurassic, all of
399-492: A dominant component of Jurassic floras. The Late Triassic and Jurassic was a major time of diversification of conifers, with most modern conifer groups appearing in the fossil record by the end of the Jurassic, having evolved from voltzialean ancestors. Araucarian conifers have their first unambiguous records during the Early Jurassic, and members of the modern genus Araucaria were widespread across both hemispheres by
532-466: A further grant of crest and supporters was obtained. The crest is the head of a Dartmoor Pony rising from a "Naval Crown". This distinctive form of crown is formed from the sails and sterns of ships, and is associated with the Royal Navy . The supporters are a Devon bull and a sea lion. Devon County Council adopted a "ship silhouette" logo after the 1974 reorganisation, adapted from the ship emblem on
665-623: A kink in one of the plate boundaries, resulting in the formation of the Pacific Plate at the centre of the junction. During the Middle to early Late Jurassic, the Sundance Seaway , a shallow epicontinental sea , covered much of northwest North America. The eustatic sea level is estimated to have been close to present levels during the Hettangian and Sinemurian, rising several tens of metres during
798-612: A large part in the religious life of Devon today, although the county has shared in the post-World War II decline in British religious feeling. The Diocese of Exeter remains the Anglican diocese including the whole of Devon. The Roman Catholic Diocese of Plymouth was established in the mid 19th century. There was no established coat of arms for the county until 1926: the arms of the City of Exeter were often used to represent Devon, for instance in
931-453: A result of high ocean acidity and temperature inhibiting its mineralisation into apatite; the abundance of phosphorus in marine environments caused further eutrophication and consequent anoxia in a positive feedback loop. The end-Jurassic transition was originally considered one of eight mass extinctions, but is now considered to be a complex interval of faunal turnover, with the increase in diversity of some groups and decline in others, though
1064-558: A result of some reintroductions. Another recent reintroduction is the Eurasian beaver , primarily on the river Otter. Other rare species recorded in Devon include seahorses and the sea daffodil. The botany of the county is very diverse and includes some rare species not found elsewhere in the British Isles other than Cornwall. Devon is divided into two Watsonian vice-counties : north and south,
1197-610: A soft, sooty coal, which is known in Devon as culm , or from the contortions commonly found in the beds. This formation stretches from Bideford to Bude in Cornwall, and contributes to a gentler, greener, more rounded landscape. It is also found on the western, north and eastern borders of Dartmoor. The sedimentary rocks in more eastern parts of the county include Permian and Triassic sandstones (giving rise to east Devon's well known fertile red soils); Bunter pebble beds around Budleigh Salterton and Woodbury Common and Jurassic rocks in
1330-594: A varied geography. It contains Dartmoor and part of Exmoor , two upland moors which are the source of most of the county's rivers, including the Taw , Dart , and Exe . The longest river in the county is the Tamar , which forms most of the border with Cornwall and rises in Devon's northwest hills. The southeast coast is part of the Jurassic Coast World Heritage Site , and characterised by tall cliffs which reveal
1463-483: Is Austrohamia minuta from the Early Jurassic (Pliensbachian) of Patagonia, known from many parts of the plant. The reproductive structures of Austrohamia have strong similarities to those of the primitive living cypress genera Taiwania and Cunninghamia . By the Middle to Late Jurassic Cupressaceae were abundant in warm temperate–tropical regions of the Northern Hemisphere, most abundantly represented by
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#17330847196741596-466: Is -combe which derives from Brittonic cwm meaning 'valley' usually prefixed by the name of the possessor. William Camden , in his 1607 edition of Britannia , described Devon as being one part of an older, wider country that once included Cornwall : THAT region which, according to the Geographers, is the first of all Britaine, and, growing straiter still and narrower, shooteth out farthest into
1729-628: Is a ceremonial county in South West England . It is bordered by the Bristol Channel to the north, Somerset and Dorset to the east, the English Channel to the south, and Cornwall to the west. The city of Plymouth is the largest settlement, and the city of Exeter is the county town . The county has an area of 2,590 sq mi (6,700 km ) and a population of 1,194,166. The largest settlements after Plymouth (264,695) are
1862-479: Is a county bird society dedicated to the study and conservation of wild birds. The RSPB has reserves in the county, and Natural England is responsible for over 200 Devon Sites of Special Scientific Interest and National Nature Reserves , such as Slapton Ley . The Devon Bat Group was founded in 1984 to help conserve bats. Wildlife found in this area extend to a plethora of different kinds of insects, butterflies and moths; an interesting butterfly to take look at
1995-462: Is a wide range of wildlife (see Dartmoor wildlife , for example). A popular challenge among birders is to find over 100 species in the county in a day. The county's wildlife is protected by several wildlife charities such as the Devon Wildlife Trust , which looks after 40 nature reserves. The Devon Bird Watching and Preservation Society (founded in 1928 and known since 2005 as "Devon Birds")
2128-487: Is divided into three epochs : Early, Middle, and Late. Similarly, in stratigraphy , the Jurassic is divided into the Lower Jurassic , Middle Jurassic , and Upper Jurassic series . Geologists divide the rocks of the Jurassic into a stratigraphic set of units called stages , each formed during corresponding time intervals called ages. Stages can be defined globally or regionally. For global stratigraphic correlation,
2261-629: Is due to a mistake in the making of the original letters patent for the Duke of Devonshire , resident in Derbyshire . There are references to both Defnas and Defenasċīre in Anglo-Saxon texts from before 1000 CE (the former is a name for the "people of Devon" and the latter would mean 'Shire of the Devonians'), which translates to modern English as Devonshire . The term Devonshire may have originated around
2394-546: Is followed by the Kimmeridgian Warm Interval (KWI) between 164 and 150 million years ago. Based on fossil wood distribution, this was one of the wettest intervals of the Jurassic. The Pangaean interior had less severe seasonal swings than in previous warm periods as the expansion of the Central Atlantic and Western Indian Ocean provided new sources of moisture. A prominent drop in temperatures occurred during
2527-463: Is fourth order, with a periodicity of approximately 410,000 years. During the Early Jurassic the world's oceans transitioned from an aragonite sea to a calcite sea chemistry, favouring the dissolution of aragonite and precipitation of calcite . The rise of calcareous plankton during the Middle Jurassic profoundly altered ocean chemistry, with the deposition of biomineralized plankton on
2660-546: Is lined with tourist resorts, many of which grew rapidly with the arrival of the railways in the 19th century. Examples include Dawlish, Exmouth and Sidmouth on the south coast, and Ilfracombe and Lynmouth on the north. The Torbay conurbation of Torquay, Paignton and Brixham on the south coast is now administratively independent of the county. Rural market towns in the county include Barnstaple, Bideford, Honiton , Newton Abbot , Okehampton , Tavistock , Totnes and Tiverton . The boundary with Cornwall has not always been on
2793-469: Is marked by a globally documented high amplitude negative carbon isotope excursion, as well as the deposition of black shales and the extinction and collapse of carbonate-producing marine organisms, associated with a major rise in global temperatures. The TOAE is often attributed to the eruption of the Karoo-Ferrar large igneous provinces and the associated increase of carbon dioxide concentration in
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#17330847196742926-561: Is named after the city of Oxford in England and was named by Alcide d'Orbigny in 1844 in reference to the Oxford Clay . The base of the Oxfordian lacks a defined GSSP. W. J. Arkell in studies in 1939 and 1946 placed the lower boundary of the Oxfordian as the first appearance of the ammonite Quenstedtoceras mariae (then placed in the genus Vertumniceras ). Subsequent proposals have suggested
3059-564: Is relatively uncommon away from high land, although there are few exceptions. The county has mild summers with occasional warm spells and cool rainy periods. Winters are generally cool and the county often experiences some of the mildest winters in the world for its high latitude, with average daily maximum temperatures in January at 8 °C (46 °F). Rainfall varies significantly across the county, ranging from over 2,000 mm (79 in) on parts of Dartmoor, to around 750 mm (30 in) in
3192-450: Is the chequered skipper . Devon is a national hotspot for several species that are uncommon in Britain, including the cirl bunting ; greater horseshoe bat ; Bechstein's bat and Jersey tiger moth . It is also the only place in mainland Britain where the sand crocus ( Romulea columnae ) can be found – at Dawlish Warren, and is home to all six British native land reptile species, partly as
3325-608: Is the 218 m (715 ft) Little Hangman, which marks the western edge of coastal Exmoor. One of the features of the North Devon coast is that Bideford Bay and the Hartland Point peninsula are both west-facing, Atlantic facing coastlines; so that a combination of an off-shore (east) wind and an Atlantic swell produce excellent surfing conditions. The beaches of Bideford Bay ( Woolacombe , Saunton , Westward Ho! and Croyde ), along with parts of North Cornwall and South Wales, are
3458-405: Is the city of Exeter. The largest city in Devon, Plymouth, and the conurbation of Torbay (which includes the largest town in Devon and capital of Torbay, Torquay, as well as Paignton and Brixham) have been unitary authorities since 1998, separate from the remainder of Devon which is administered by Devon County Council for the purposes of local government. Devon County Council is controlled by
3591-678: Is the setting of the world's largest oil reserves, including the Ghawar Field , the world's largest oil field. The Jurassic-aged Sargelu and Naokelekan formations are major source rocks for oil in Iraq . Over 1500 gigatons of Jurassic coal reserves are found in north-west China, primarily in the Turpan-Hami Basin and the Ordos Basin . Major impact structures include the Morokweng impact structure ,
3724-606: Is used to mark the beginnings of stages, as well as smaller timespans within stages, referred to as "ammonite zones"; these, in turn, are also sometimes subdivided further into subzones. Global stratigraphy is based on standard European ammonite zones, with other regions being calibrated to the European successions. The oldest part of the Jurassic Period has historically been referred to as the Lias or Liassic, roughly equivalent in extent to
3857-452: The College of Arms . The main part of the shield displays a red crowned lion on a silver field, the arms of Richard Plantagenet, Earl of Cornwall . The chief or upper portion of the shield depicts an ancient ship on wavers, for Devon's seafaring traditions. The Latin motto adopted was Auxilio Divino (by Divine aid), that of Sir Francis Drake . The 1926 grant was of arms alone. On 6 March 1962
3990-666: The Devonian strata of north Devon and south west Devon (and extending into Cornwall); ii) the Culm Measures (north western Devon also extending into north Cornwall); and iii) the granite intrusion of Dartmoor in central Devon, part of the Cornubian batholith forming the 'spine' of the southwestern peninsula. There are blocks of Silurian and Ordovician rocks within Devonian strata on the south Devon coast but otherwise no pre-Devonian rocks on
4123-574: The France–Switzerland border . The name "Jura" is derived from the Celtic root * jor via Gaulish *iuris "wooded mountain", which was borrowed into Latin as a name of a place and evolved into Juria and finally Jura . During a tour of the region in 1795, German naturalist Alexander von Humboldt recognized carbonate deposits within the Jura Mountains as geologically distinct from
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4256-479: The Glorious Revolution of 1688 took place at Brixham . Devon has produced tin , copper and other metals from ancient times. Devon's tin miners enjoyed a substantial degree of independence through Devon's Stannary Convocation , which dates back to the 12th century. The last recorded sitting was in 1748. Devon straddles a peninsula and so, uniquely among English counties, has two separate coastlines: on
4389-503: The International Commission on Stratigraphy (ICS) ratify global stages based on a Global Boundary Stratotype Section and Point (GSSP) from a single formation (a stratotype ) identifying the lower boundary of the stage. The ages of the Jurassic from youngest to oldest are as follows: Jurassic stratigraphy is primarily based on the use of ammonites as index fossils . The first appearance datum of specific ammonite taxa
4522-816: The Order of Brothelyngham —a fake monastic order of 1348 — regularly rode through Exeter, kidnapping both religious men and laymen, and extorting money from them as ransom. Devon has also featured in most of the civil conflicts in England since the Norman conquest , including the Wars of the Roses , Perkin Warbeck 's rising in 1497, the Prayer Book Rebellion of 1549, and the English Civil War . The arrival of William of Orange to launch
4655-578: The Prayer Book Rebellion caused the deaths of thousands of people from Devon and Cornwall. During the English Reformation , churches in Devon officially became affiliated with the Church of England . From the late sixteenth century onwards, zealous Protestantism – or 'puritanism' – became increasingly well-entrenched in some parts of Devon, while other districts of the county remained much more conservative. These divisions would become starkly apparent during
4788-697: The Redcar Mudstone Formation , and was ratified in 2005. The beginning of the Pliensbachian is defined by the first appearance of the ammonite Bifericeras donovani . The village Thouars (Latin: Toarcium ), just south of Saumur in the Loire Valley of France , lends its name to the Toarcian Stage. The Toarcian was named by Alcide d'Orbigny in 1842, with the original locality being Vrines quarry around 2 km northwest of Thouars. The GSSP for
4921-661: The River Tale ', a tributary of the River Otter , whose name is in turn derived from the Old English word getæl meaning 'quick, active or swift'. The parish includes Larkbeare hamlet and part of Fairmile hamlet. The village has a public house, the Talaton Inn; a manor house, Talaton House; a church, St James the Great, and a village hall. There are a number of listed buildings within
5054-767: The Triassic aged Muschelkalk of southern Germany , but he erroneously concluded that they were older. He then named them Jura-Kalkstein ('Jura limestone') in 1799. In 1829, the French naturalist Alexandre Brongniart published a book entitled Description of the Terrains that Constitute the Crust of the Earth or Essay on the Structure of the Known Lands of the Earth. In this book, Brongniart used
5187-500: The Triassic , Jurassic and Cretaceous geology of the region. The county gives its name to the Devonian geologic period, which includes the slates and sandstones of the north coast. Dartmoor and Exmoor have been designated national parks , and the county also contains, in whole or in part, five national landscapes . In the Iron Age , Roman and the Sub-Roman periods, the county was
5320-567: The rain shadow along the coast in southeastern Devon and around Exeter. Sunshine amounts also vary widely: the moors are generally cloudy, but the SE coast from Salcombe to Exmouth is one of the sunniest parts of the UK (a generally cloudy region). With westerly or south-westerly winds and high pressure the area around Torbay and Teignmouth will often be warm, with long sunny spells due to shelter by high ground ( Foehn wind ). The variety of habitats means that there
5453-481: The "Deep Valley Dwellers". The region to the west of Exeter was less Romanised than the rest of Roman Britain since it was considered a remote part of the province. After the formal Roman withdrawal from Britain in AD 410, one of the leading Dumnonii families attempted to create a dynasty and rule over Devon as the new Kings of Dumnonii. Celtic paganism and Roman practices were the first known religions in Devon, although in
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5586-454: The 8th century, when it changed from Dumnonia ( Latin ) to Defenasċīr . Kents Cavern in Torquay had produced human remains from 30 to 40,000 years ago. Dartmoor is thought to have been occupied by Mesolithic hunter-gatherer peoples from about 6000 BC. The Romans held the area under military occupation for around 350 years. Later, the area began to experience Saxon incursions from
5719-619: The Aalenian, precessionally forced climatic changes dictated peatland wildfire magnitude and frequency. The European climate appears to have become noticeably more humid at the Aalenian-Bajocian boundary but then became more arid during the middle Bajocian. A transient ice age possibly occurred in the late Bajocian. The Callovian-Oxfordian boundary at the end of the MJCI witnessed particularly notable global cooling, potentially even an ice age. This
5852-725: The Bajocian Stage after the town of Bayeux (Latin: Bajoce ) in Normandy, France. The GSSP for the base of the Bajocian is located in the Murtinheira section at Cabo Mondego , Portugal; it was ratified in 1997. The base of the Bajocian is defined by the first appearance of the ammonite Hyperlioceras mundum . The Bathonian is named after the city of Bath , England, introduced by Belgian geologist d'Omalius d'Halloy in 1843, after an incomplete section of oolitic limestones in several quarries in
5985-411: The Black Jurassic and the overlying clayey sandstone and ferruginous oolite of the Brown Jurassic sequences of southwestern Germany. The GSSP for the base of the Aalenian is located at Fuentelsaz in the Iberian range near Guadalajara, Spain , and was ratified in 2000. The base of the Aalenian is defined by the first appearance of the ammonite Leioceras opalinum . Alcide d'Orbigny in 1842 named
6118-560: The Black Jurassic in England by William Conybeare and William Phillips in 1822. William Phillips, the geologist, worked with William Conybeare to find out more about the Black Jurassic in England. The French palaeontologist Alcide d'Orbigny in papers between 1842 and 1852 divided the Jurassic into ten stages based on ammonite and other fossil assemblages in England and France, of which seven are still used, but none has retained its original definition. The German geologist and palaeontologist Friedrich August von Quenstedt in 1858 divided
6251-491: The Bristol Channel and Celtic Sea in the north, and on the English Channel in the south. The South West Coast Path runs along the entire length of both, around 65% of which is named as Heritage Coast . Before the changes to English counties in 1974, Devon was the third largest county by area and the largest of the counties not divided into county-like divisions (only Yorkshire and Lincolnshire were larger and both were sub-divided into ridings or parts, respectively). Since 1974
6384-465: The Callovian–Oxfordian boundary, peaking possibly as high as 140 metres above present sea level at the Kimmeridgian–Tithonian boundary. The sea levels falls in the late Tithonian, perhaps to around 100 metres, before rebounding to around 110 metres at the Tithonian–Berriasian boundary. The sea level within the long-term trends across the Jurassic was cyclical, with 64 fluctuations, 15 of which were over 75 metres. The most noted cyclicity in Jurassic rocks
6517-402: The Confessor by Lyfing's successor Bishop Leofric , hitherto Bishop of Crediton, who became first Bishop of Exeter under Edward the Confessor, which was established as his cathedral city in 1050. At first, the abbey church of St Mary and St Peter, founded by Athelstan in 932 and rebuilt in 1019, served as the cathedral. Devon came under the political influence of several different nobles during
6650-851: The Conservatives, and the political representation of its 60 councillors are: 38 Conservatives , 10 Liberal Democrats , six Labour , three Independents , two Green and one South Devon Alliance. At the 2024 general election , Devon returned six Liberal Democrats, four Conservatives and three Labour MPs to the House of Commons . Historically Devon was divided into 32 hundreds : Axminster , Bampton , Black Torrington , Braunton , Cliston , Coleridge , Colyton , Crediton , East Budleigh , Ermington , Exminster , Fremington , Halberton , Hartland , Hayridge , Haytor , Hemyock , Lifton , North Tawton and Winkleigh , Ottery , Plympton , Roborough , Shebbear , Shirwell , South Molton , Stanborough , Tavistock , Teignbridge , Tiverton , West Budleigh , Witheridge , and Wonford . A devolution deal
6783-402: The Country of this nation is at this day divided into two parts, knowen by later names of Cornwall and Denshire, [...] The term Devon is normally used for everyday purposes (e.g., "Devon County Council"), but Devonshire has continued to be used in the names of the " Devonshire and Dorset Regiment " (until 2007) and " The Devonshire Association ". One erroneous theory is that the shire suffix
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#17330847196746916-436: The Devon Flora by Ivimey-Cook appeared in 1984, and A New Flora of Devon , based on field work undertaken between 2005 and 2014, was published in 2016. Rising temperatures have led to Devon becoming the first place in modern Britain to cultivate olives commercially. In January 2024, plans were announced to plant over 100,000 trees in northern Devon to support Celtic rainforests , which are cherished yet at risk ecosystems in
7049-418: The Devon mainland. The metamorphic rocks of Eddystone are of presumed Precambrian age. The oldest rocks which can be dated are those of the Devonian period which are approximately 395–359 million years old. Sandstones and shales were deposited in North and South Devon beneath tropical seas. In shallower waters, limestone beds were laid down in the area now near Torquay and Plymouth. This geological period
7182-403: The Early Jurassic, but also including part of the preceding Rhaetian . The Hettangian Stage was named by Swiss palaeontologist Eugène Renevier in 1864 after Hettange-Grande in north-eastern France. The GSSP for the base of the Hettangian is located at the Kuhjoch Pass, Karwendel Mountains , Northern Calcareous Alps , Austria; it was ratified in 2010. The beginning of the Hettangian, and thus
7315-414: The English Civil War of 1642–46, when the county split apart along religious and cultural lines. The Methodism of John Wesley proved to be very popular with the working classes in Devon in the 19th century. Methodist chapels became important social centres, with male voice choirs and other church-affiliated groups playing a central role in the social lives of working class Devonians. Methodism still plays
7448-408: The Greek goddess of dawn . His name was chosen by Albert Oppel for this stratigraphical stage because the Tithonian finds itself hand in hand with the dawn of the Cretaceous. The base of the Tithonian currently lacks a GSSP. The working definition for the base of the Tithonian is the first appearance of the ammonite genus Gravesia . The upper boundary of the Jurassic is currently undefined, and
7581-413: The Jurassic as a whole, is marked by the first appearance of the ammonite Psiloceras spelae tirolicum in the Kendlbach Formation exposed at Kuhjoch. The base of the Jurassic was previously defined as the first appearance of Psiloceras planorbis by Albert Oppel in 1856–58, but this was changed as the appearance was seen as too localised an event for an international boundary. The Sinemurian Stage
7714-487: The Jurassic, both the North and South Pole were covered by oceans. Beginning in the Early Jurassic, the Boreal Ocean was connected to the proto-Atlantic by the "Viking corridor" or Transcontinental Laurasian Seaway, a passage between the Baltic Shield and Greenland several hundred kilometers wide. During the Callovian, the Turgai Epicontinental Sea formed, creating a marine barrier between Europe and Asia. Madagascar and Antarctica began to rift away from Africa during
7847-428: The Jurassic, however, has no clear, definitive boundary with the Cretaceous and is the only boundary between geological periods to remain formally undefined. By the beginning of the Jurassic, the supercontinent Pangaea had begun rifting into two landmasses: Laurasia to the north and Gondwana to the south. The climate of the Jurassic was warmer than the present, and there were no ice caps . Forests grew close to
7980-437: The Jurassic, the North Atlantic Ocean remained relatively narrow, while the South Atlantic did not open until the Cretaceous. The continents were surrounded by Panthalassa , with the Tethys Ocean between Gondwana and Asia. At the end of the Triassic, there was a marine transgression in Europe, flooding most parts of central and western Europe transforming it into an archipelago of islands surrounded by shallow seas. During
8113-510: The Jurassic–Cretaceous boundary is currently the only system boundary to lack a defined GSSP. Placing a GSSP for this boundary has been difficult because of the strong regionality of most biostratigraphic markers, and lack of any chemostratigraphic events, such as isotope excursions (large sudden changes in ratios of isotopes ), that could be used to define or correlate a boundary. Calpionellids , an enigmatic group of planktonic protists with urn-shaped calcitic tests briefly abundant during
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#17330847196748246-407: The Late Jurassic (Kimmeridgian) of Scotland, which remains the only known unequivocal fossil of the group before the Cretaceous. Despite being the earliest known member of the Pinaceae, Eathiestrobus appears to be a member of the pinoid clade of the family, suggesting that the initial diversification of Pinaceae occurred earlier than has been found in the fossil record. The earliest record of
8379-421: The Middle Ages, especially the Courtenays Earl of Devon . During the Wars of the Roses, important magnates included the Earl of Devon, William Bonville, 1st Baron Bonville , and Humphrey Stafford, earl of Devon whose wider influence stretched from Cornwall to Wiltshire. After 1485, one of the county's influential figures included Henry VII's courtier Robert Willoughby, 1st Baron Willoughby de Broke . In 1549,
8512-416: The Middle Jurassic. Also abundant during the Jurassic is the extinct family Cheirolepidiaceae , often recognised through their highly distinctive Classopolis pollen. Jurassic representatives include the pollen cone Classostrobus and the seed cone Pararaucaria . Araucarian and Cheirolepidiaceae conifers often occur in association. The oldest definitive record of the cypress family ( Cupressaceae )
8645-445: The Middle to Late Jurassic, corresponding to the increasing aridity of the region. Ginkgoales , of which the sole living species is Ginkgo biloba , were more diverse during the Jurassic: they were among the most important components of Eurasian Jurassic floras and were adapted to a wide variety of climatic conditions. The earliest representatives of the genus Ginkgo , represented by ovulate and pollen organs similar to those of
8778-405: The North Atlantic Ocean with eastern Panthalassa. Palaeontological data suggest that the seaway had been open since the Early Jurassic. As part of the Nevadan orogeny , which began during the Triassic, the Cache Creek Ocean closed, and various terranes including the large Wrangellia Terrane accreted onto the western margin of North America. By the Middle Jurassic the Siberian plate and
8911-462: The North China-Amuria block had collided, resulting in the closure of the Mongol-Okhotsk Ocean . During the Early Jurassic, around 190 million years ago, the Pacific Plate originated at the triple junction of the Farallon , Phoenix , and Izanagi tectonic plates , the three main oceanic plates of Panthalassa. The previously stable triple junction had converted to an unstable arrangement surrounded on all sides by transform faults because of
9044-555: The Patron Saint of Devon. Devon's toponyms include many with the endings "coombe/combe" and "tor". Both 'coombe' (valley or hollow, cf. Welsh cwm , Cornish komm ) and 'tor' (Old Welsh twrr and Scots Gaelic tòrr from Latin turris ; 'tower' used for granite formations) are rare Celtic loanwords in English and their frequency is greatest in Devon which shares a boundary with historically Brittonic speaking Cornwall. Ruined medieval settlements of Dartmoor longhouses indicate that dispersed rural settlement (OE tun , now often -ton)
9177-416: The River Tamar as at present: until the late 19th century a few parishes in the Torpoint area were in Devon and five parishes now in north-east Cornwall were in Devon until 1974 (however, for ecclesiastical purposes these were nevertheless in the Archdeaconry of Cornwall and in 1876 became part of the Diocese of Truro ). The region of Devon was the dominion of the pre-Roman Dumnonii Celtic tribe , known as
9310-404: The River Tamar—-with a division almost exactly following the modern county boundary —but also between Devon and the rest of Southern England. Devon's population also exhibited similarities with modern northern France, including Brittany . This suggests the Anglo-Saxon migration into Devon was limited, rather than a mass movement of people. The border with Cornwall was set by King Æthelstan on
9443-502: The TOAE represented one of the most severe extinctions in their evolutionary history. While the event had significant impact on marine invertebrates, it had little effect on marine reptiles. During the TOAE, the Sichuan Basin was transformed into a giant lake , probably three times the size of modern-day Lake Superior , represented by the Da'anzhai Member of the Ziliujing Formation . The lake likely sequestered ~460 gigatons (Gt) of organic carbon and ~1,200 Gt of inorganic carbon during
9576-558: The Talaton Trotter, a 6.5 mile cross country race. Escot House is the seat of the Kennaway baronets . [REDACTED] Media related to Talaton at Wikimedia Commons 50°47′N 3°19′W / 50.783°N 3.317°W / 50.783; -3.317 Devon Devon ( / ˈ d ɛ v ə n / DEV -ən ; historically also known as Devonshire /- ʃ ɪər , - ʃ ər / -sheer , -shər )
9709-536: The Teign Valley Museum), as well as one of the county's football teams, Plymouth Argyle . On 17 October 2006, the flag was hoisted for the first time outside County Hall in Exeter to mark Local Democracy Week, receiving official recognition from the county council. In 2019 Devon County Council with the support of both the Anglican and Catholic churches in Exeter and Plymouth, officially recognised Saint Boniface as
9842-737: The Tithonian, known as the Early Tithonian Cooling Event (ETCE). The end of the Jurassic was marked by the Tithonian–early Barremian Cool Interval (TBCI), beginning 150 million years ago and continuing into the Early Cretaceous . The Toarcian Oceanic Anoxic Event (TOAE), also known as the Jenkyns Event, was an episode of widespread oceanic anoxia during the early part of the Toarcian Age, c. 183 Mya. It
9975-717: The Toarcian around 174 million years ago. During the Toarcian Warm Interval, ocean surface temperatures likely exceeded 30 °C (86 °F), and equatorial and subtropical (30°N–30°S) regions are likely to have been extremely arid, with temperatures in the interior of Pangea likely in excess of 40 °C (104 °F).The Toarcian Warm Interval is followed by the Middle Jurassic Cool Interval (MJCI) between 174 and 164 million years ago, which may have been punctuated by brief, ephemeral icehouse intervals. During
10108-634: The UK. The project aims to create 50 hectares of new rainforest across three sites, planting trees near existing rainforest areas along the coast and inland. Among the tree species to be planted is the rare Devon whitebeam , known for its unique reproduction method and once-popular fruit. Led by the National Trust and with the assistance of volunteers and community groups, the initiative will focus on locations in Exmoor , Woolacombe , Hartland , and Arlington Court . The administrative centre and capital of Devon
10241-567: The West, [...] was in antient time inhabited by those Britans whom Solinus called Dumnonii, Ptolomee Damnonii [...] For their habitation all over this Countrey is somewhat low and in valleys, which manner of dwelling is called in the British tongue Dan-munith, in which sense also the Province next adjoyning in like respect is at this day named by the Britans Duffneit, that is to say, Low valleys. [...] But
10374-475: The atmosphere, as well as the possible associated release of methane clathrates . This likely accelerated the hydrological cycle and increased silicate weathering , as evidenced by an increased amount of organic matter of terrestrial origin found in marine deposits during the TOAE. Groups affected include ammonites, ostracods , foraminifera , bivalves , cnidarians , and especially brachiopods , for which
10507-571: The badge of the Devonshire Regiment . During the forming of a county council by the Local Government Act 1888 adoption of a common seal was required. The seal contained three shields depicting the arms of Exeter along with those of the first chairman and vice-chairman of the council ( Lord Clinton and the Earl of Morley ). On 11 October 1926, the county council received a grant of arms from
10640-457: The base of the Toarcian is located at Peniche, Portugal , and was ratified in 2014. The boundary is defined by the first appearance of ammonites belonging to the subgenus Dactylioceras ( Eodactylites ) . The Aalenian is named after the city of Aalen in Germany. The Aalenian was defined by Swiss geologist Karl Mayer-Eymar in 1864. The lower boundary was originally between the dark clays of
10773-517: The boundary being an irregular line approximately across the higher part of Dartmoor and then along the canal eastwards. Botanical reports begin in the 17th century and there is a Flora Devoniensis by Jones and Kingston in 1829. A general account appeared in The Victoria History of the County of Devon (1906), and a Flora of Devon was published in 1939 by Keble Martin and Fraser. An Atlas of
10906-495: The city of Exeter (130,709) and the seaside resorts of Torquay and Paignton , which have a combined population of 115,410. They all are located along the south coast, which is the most populous part of the county; Barnstaple (31,275) and Tiverton (22,291) are the largest towns in the north and centre respectively. For local government purposes Devon comprises a non-metropolitan county , with eight districts, and two unitary authority areas: Plymouth and Torbay . Devon has
11039-437: The coat of arms, but following the loss in 1998 of Plymouth and Torbay re-adopted the coat of arms. In April 2006 the council unveiled a new logo which was to be used in most everyday applications, though the coat of arms will continue to be used for "various civic purposes". Devon also has its own flag which has been dedicated to Saint Petroc, a local saint with dedications throughout Devon and neighbouring counties. The flag
11172-421: The county has attractive rolling rural scenery and villages with thatched cob cottages. All these features make Devon a popular holiday destination. In South Devon the landscape consists of rolling hills dotted with small towns, such as Dartmouth , Ivybridge , Kingsbridge , Salcombe , and Totnes . The towns of Torquay and Paignton are the principal seaside resorts on the south coast. East Devon has
11305-575: The county is ranked fourth by area (due to the creation of Cumbria) amongst ceremonial counties and is the third largest non-metropolitan county . The island of Lundy and the reef of Eddystone are also in Devon. The county has more mileage of road than any other county in England. Inland, the Dartmoor National park lies wholly in Devon, and the Exmoor National Park lies in both Devon and Somerset. Apart from these areas of high moorland
11438-594: The diocese of Wessex, while nothing is known of the church organisation of the Celtic areas. About 703 Devon and Cornwall were included in the separate diocese of Sherborne and in 900 this was again divided into two, the Devon bishop having from 905 his seat at Tawton (now Bishop's Tawton ) and from 912 at Crediton , birthplace of St Boniface. Lyfing became Bishop of Crediton in 1027 and shortly afterwards became Bishop of Cornwall . The two dioceses of Crediton and Cornwall, covering Devon and Cornwall, were united under Edward
11571-562: The east around 600 AD, firstly as small bands of settlers along the coasts of Lyme Bay and southern estuaries and later as more organised bands pushing in from the east. Devon became a frontier between Brittonic and Anglo-Saxon Wessex, and it was largely absorbed into Wessex by the mid ninth century. A genetic study carried out by the University of Oxford & University College London discovered separate genetic groups in Cornwall and Devon. Not only were there differences on either side of
11704-619: The east bank of the River Tamar in 936 AD. Danish raids also occurred sporadically along many coastal parts of Devon between around 800AD and just before the time of the Norman conquest, including the silver mint at Hlidaforda Lydford in 997 and Taintona (a settlement on the Teign estuary) in 1001. Devon was the home of a number of anticlerical movements in the Later Middle Ages . For example,
11837-529: The easternmost parts of Devon. Smaller outcrops of younger rocks also exist, such as Cretaceous chalk cliffs at Beer Head and gravels on Haldon, plus Eocene and Oligocene ball clay and lignite deposits in the Bovey Basin, formed around 50 million years ago under tropical forest conditions. Devon generally has a cool oceanic climate, heavily influenced by the North Atlantic Drift . In winter, snow
11970-679: The end of the Jurassic. The oldest unambiguous members of Podocarpaceae are known from the Jurassic, found across both hemispheres, including Scarburgia and Harrisiocarpus from the Middle Jurassic of England, as well as unnamed species from the Middle-Late Jurassic of Patagonia. During the Early Jurassic, the flora of the mid-latitudes of Eastern Asia were dominated by the extinct deciduous broad leafed conifer Podozamites , which appears to not be closely related to any living family of conifer. Its range extended northwards into polar latitudes of Siberia and then contracted northward in
12103-686: The end of the Triassic, the Peltaspermaceae became extinct in most parts of the world, with Lepidopteris persisting into the Early Jurassic in Patagonia. Dicroidium , a corystosperm seed fern that was a dominant part of Gondwanan floral communities during the Triassic, also declined at the Triassic–Jurassic boundary, surviving as a relict in Antarctica into the Early Jurassic. Conifers formed
12236-657: The eruption of the Central Atlantic Magmatic Province (CAMP). The beginning of the Toarcian Age started around 183 million years ago and is marked by the Toarcian Oceanic Anoxic Event , a global episode of oceanic anoxia , ocean acidification , and elevated global temperatures associated with extinctions, likely caused by the eruption of the Karoo-Ferrar large igneous provinces . The end of
12369-417: The event. Seawater pH , which had already substantially decreased prior to the event, increased slightly during the early stages of the TOAE, before dropping to its lowest point around the middle of the event. This ocean acidification is the probable cause of the collapse of carbonate production. Additionally, anoxic conditions were exacerbated by enhanced recycling of phosphorus back into ocean water as
12502-550: The evidence for this is primarily European, probably controlled by changes in eustatic sea level. There is no evidence of a mass extinction of plants at the Triassic–Jurassic boundary. At the Triassic–Jurassic boundary in Greenland, the sporomorph (pollen and spores) record suggests a complete floral turnover. An analysis of macrofossil floral communities in Europe suggests that changes were mainly due to local ecological succession . At
12635-472: The few cynodont lineages to survive the end of the Triassic, continued to diversify throughout the period, with the Jurassic seeing the emergence of the first crown group mammals . Crocodylomorphs made the transition from a terrestrial to an aquatic life. The oceans were inhabited by marine reptiles such as ichthyosaurs and plesiosaurs , while pterosaurs were the dominant flying vertebrates . Modern sharks and rays first appeared and diversified during
12768-660: The first appearance of Cardioceras redcliffense as the lower boundary. The village of Kimmeridge on the coast of Dorset , England, is the origin of the name of the Kimmeridgian. The stage was named by Alcide d'Orbigny in 1842 in reference to the Kimmeridge Clay . The GSSP for the base of the Kimmeridgian is the Flodigarry section at Staffin Bay on the Isle of Skye , Scotland , which
12901-460: The first appearance of the ammonite Strambergella jacobi , formerly placed in the genus Berriasella , but its use as a stratigraphic indicator has been questioned, as its first appearance does not correlate with that of C. alpina . The Kimmeridge Clay and equivalents are the major source rock for the North Sea oil . The Arabian Intrashelf Basin, deposited during the Middle and Late Jurassic,
13034-601: The first seaside resort to be developed in the county, Exmouth and the more upmarket Georgian town of Sidmouth , headquarters of the East Devon District Council. Exmouth marks the western end of the Jurassic Coast World Heritage Site . Another notable feature is the coastal railway line between Newton Abbot and the Exe Estuary: the red sandstone cliffs and sea views are very dramatic and in
13167-402: The genus Elatides . The Jurassic also saw the first appearances of some modern genera of cypresses, such as Sequoia . Members of the extinct genus Schizolepidopsis which likely represent a stem-group to the pine family ( Pinaceae ), were widely distributed across Eurasia during the Jurassic. The oldest unambiguous record of Pinaceae is the pine cone Eathiestrobus , known from
13300-562: The home of the Dumnonii Celtic Britons . The Anglo-Saxon settlement of Britain resulted in the partial assimilation of Dumnonia into the kingdom of Wessex in the eighth and ninth centuries, and the western boundary with Cornwall was set at the Tamar by king Æthelstan in 936. The name Devon derives from the name of the Brythons who inhabited the southwestern peninsula of Britain at
13433-585: The late Early Jurassic in association with the eruption of the Karoo-Ferrar large igneous provinces , opening the western Indian Ocean and beginning the fragmentation of Gondwana. At the beginning of the Jurassic, North and South America remained connected, but by the beginning of the Late Jurassic they had rifted apart to form the Caribbean Seaway, also known as the Hispanic Corridor, which connected
13566-416: The late Sinemurian–Pliensbachian before regressing to near present levels by the late Pliensbachian. There seems to have been a gradual rise to a peak of ~75 m above present sea level during the Toarcian. During the latest part of the Toarcian, the sea level again dropped by several tens of metres. It progressively rose from the Aalenian onwards, aside from dips of a few tens of metres in the Bajocian and around
13699-518: The latest Jurassic to earliest Cretaceous, have been suggested to represent the most promising candidates for fixing the Jurassic–Cretaceous boundary In particular, the first appearance Calpionella alpina , co-inciding with the base of the eponymous Alpina subzone, has been proposed as the definition of the base of the Cretaceous. The working definition for the boundary has often been placed as
13832-637: The main centres of surfing in Britain. A geological dividing line cuts across Devon roughly along the line of the Bristol to Exeter line and the M5 motorway east of Tiverton and Exeter. It is a part of the Tees–Exe line broadly dividing Britain into a southeastern lowland zone typified by gently dipping sedimentary rocks and a northwestern upland zone typified by igneous rocks and folded sedimentary and metamorphic rocks . The principal geological components of Devon are i)
13965-601: The mid-fourth century AD, Christianity was introduced to Devon. In the Sub-Roman period the church in the British Isles was characterised by some differences in practice from the Latin Christianity of the continent of Europe and is known as Celtic Christianity ; however it was always in communion with the wider Roman Catholic Church . Many Cornish saints are commemorated also in Devon in legends, churches and place-names. Western Christianity came to Devon when it
14098-428: The modern species, are known from the Middle Jurassic in the Northern Hemisphere. Several other lineages of ginkgoaleans are known from Jurassic rocks, including Yimaia , Grenana , Nagrenia and Karkenia . These lineages are associated with Ginkgo- like leaves, but are distinguished from living and fossil representatives of Ginkgo by having differently arranged reproductive structures. Umaltolepis from
14231-422: The ocean floor acting as a buffer against large CO 2 emissions. The climate of the Jurassic was generally warmer than that of present, by around 5–10 °C (9–18 °F), with atmospheric carbon dioxide likely about four times higher. Intermittent "cold snap" intervals are known to have occurred during this time period, however, interrupting the otherwise warm greenhouse climate. Forests likely grew near
14364-455: The oceans, resulting in large areas of desert and scrubland in the lower latitudes between 40° N and S of the equator. Tropical rainforest and tundra biomes are likely to have been rare or absent. The Jurassic also witnessed the decline of the Pangaean megamonsoon that had characterised the preceding Permian and Triassic periods. Variation in the frequency of wildfire activity in the Jurassic
14497-455: The old Roman walls of Exeter, are nearly always near the coast, as in those days travelling was done mainly by sea. The Devonian villages of Petrockstowe and Newton St Petroc are also named after Saint Petroc and the flag of Devon is dedicated to him. The history of Christianity in the South West of England remains to some degree obscure. Parts of the historic county of Devon formed part of
14630-490: The period, while the first known crown-group teleost fish appeared near the end of the period. The flora was dominated by ferns and gymnosperms , including conifers , of which many modern groups made their first appearance during the period, as well as other groups like the extinct Bennettitales . The chronostratigraphic term "Jurassic" is linked to the Jura Mountains , a forested mountain range that mainly follows
14763-530: The phrase terrains jurassiques when correlating the "Jura-Kalkstein" of Humboldt with similarly aged oolitic limestones in Britain, thus coining and publishing the term "Jurassic". The German geologist Leopold von Buch in 1839 established the three-fold division of the Jurassic, originally named from oldest to the youngest: the Black Jurassic , Brown Jurassic , and White Jurassic . The term " Lias " had previously been used for strata of equivalent age to
14896-607: The poles, where they experienced warm summers and cold, sometimes snowy winters; there were unlikely to have been ice sheets given the high summer temperatures that prevented the accumulation of snow, though there may have been mountain glaciers. Dropstones and glendonites in northeastern Siberia during the Early to Middle Jurassic indicate cold winters. The ocean depths were likely 8 °C (14 °F) warmer than present, and coral reefs grew 10° of latitude further north and south. The Intertropical Convergence Zone likely existed over
15029-476: The poles, with large arid expanses in the lower latitudes. On land, the fauna transitioned from the Triassic fauna, dominated jointly by dinosauromorph and pseudosuchian archosaurs , to one dominated by dinosaurs alone. The first stem-group birds appeared during the Jurassic, evolving from a branch of theropod dinosaurs. Other major events include the appearance of the earliest crabs and modern frogs , salamanders and lizards . Mammaliaformes , one of
15162-627: The region. The GSSP for the base of the Bathonian is Ravin du Bès, Bas-Auran area, Alpes de Haute Provence , France; it was ratified in 2009. The base of the Bathonian is defined by the first appearance of the ammonite Gonolkites convergens , at the base of the Zigzagiceras zigzag ammonite zone . The Callovian is derived from the Latinized name of the village of Kellaways in Wiltshire , England, and
15295-466: The resorts railway line and beaches are very near. North Devon is very rural with few major towns except Barnstaple , Great Torrington , Bideford and Ilfracombe . Devon's Exmoor coast has the highest cliffs in southern Britain, culminating in the Great Hangman , a 318 m (1,043 ft) "hog's-back" hill with a 250 m (820 ft) cliff-face, located near Combe Martin Bay. Its sister cliff
15428-562: The three series of von Buch in the Swabian Jura into six subdivisions defined by ammonites and other fossils. The German palaeontologist Albert Oppel in his studies between 1856 and 1858 altered d'Orbigny's original scheme and further subdivided the stages into biostratigraphic zones, based primarily on ammonites. Most of the modern stages of the Jurassic were formalized at the Colloque du Jurassique à Luxembourg in 1962. The Jurassic Period
15561-557: The time of the Roman conquest of Britain known as the Dumnonii , thought to mean 'deep valley dwellers' from Proto-Celtic * dubnos 'deep'. In the Brittonic languages , Devon is known as Welsh : Dyfnaint , Breton : Devnent and Cornish : Dewnens , each meaning 'deep valleys'. (For an account of Celtic Dumnonia , see the separate article.) Among the most common Devon placenames
15694-585: The traditional orchard-visiting Wassail in Whimple every 17 January, and the carrying of flaming tar barrels in Ottery St. Mary , where people who have lived in Ottery for long enough are called upon to celebrate Bonfire Night by running through the village (and the gathered crowds) with flaming barrels on their backs. Berry Pomeroy still celebrates Queene's Day for Elizabeth I . Devon's total economic output in 2019
15827-473: The village and a number of thatched cottages. There is also a shop within the village which is a community enterprise and has won a Prince of Wales award recognising its contribution to the community. On Spring Bank Holiday weekend the village has an open gardens weekend raising funds for the church. On the first weekend in June there is a village day which is effectively the village fayre. The village day starts with
15960-407: The world's major landmasses were coalesced into the supercontinent Pangaea , which during the Early Jurassic began to break up into northern supercontinent Laurasia and the southern supercontinent Gondwana . The rifting between North America and Africa was the first to initiate, beginning in the early Jurassic, associated with the emplacement of the Central Atlantic Magmatic Province . During
16093-581: The yew family ( Taxaceae ) is Palaeotaxus rediviva , from the Hettangian of Sweden, suggested to be closely related to the living Austrotaxus , while Marskea jurassica from the Middle Jurassic of Yorkshire, England and material from the Callovian–Oxfordian Daohugou Bed in China are thought to be closely related to Amentotaxus , with the latter material assigned to the modern genus, indicating that Taxaceae had substantially diversified by
16226-527: Was adopted in 2003 after a competition run by BBC Radio Devon . The winning design was created by website contributor Ryan Sealey, and won 49% of the votes cast. The colours of the flag are those popularly identified with Devon, for example, the colours of the University of Exeter , the rugby union team, and the Green and White flag flown by the first Viscount Exmouth at the Bombardment of Algiers (now on view at
16359-465: Was approved by both Devon County Council and Torbay Council to create a Combined County Authority with various powers such as transport, housing, skills, and support for business devolved from the UK Government. The main settlements in Devon are the cities of Plymouth, a historic port now administratively independent, Exeter, the county town , and Torbay , the county's tourist centre. Devon's coast
16492-469: Was first defined and introduced into scientific literature by Alcide d'Orbigny in 1842. It takes its name from the French town of Semur-en-Auxois , near Dijon . The original definition of Sinemurian included what is now the Hettangian. The GSSP of the Sinemurian is located at a cliff face north of the hamlet of East Quantoxhead , 6 kilometres east of Watchet , Somerset , England , within the Blue Lias , and
16625-557: Was governed by the 405 kyr eccentricity cycle. Thanks to the breakup of Pangaea, the hydrological cycle during the Jurassic was significantly enhanced. The beginning of the Jurassic was likely marked by a thermal spike corresponding to the Triassic–Jurassic extinction and eruption of the Central Atlantic magmatic province. The first part of the Jurassic was marked by the Early Jurassic Cool Interval between 199 and 183 million years ago. It has been proposed that glaciation
16758-517: Was named after Devon by Roderick Murchison and Adam Sedgwick in the 1840s and is the only British county whose name is used worldwide as the basis for a geological time period. Devon's second major rock system is the Culm Measures, a geological formation of the Carboniferous period that occurs principally in Devon and Cornwall. The measures are so called either from the occasional presence of
16891-615: Was named by Alcide d'Orbigny in 1852, originally the base at the contact between the Forest Marble Formation and the Cornbrash Formation . However, this boundary was later found to be within the upper part of the Bathonian. The base of the Callovian does not yet have a certified GSSP. The working definition for the base of the Callovian is the first appearance of ammonites belonging to the genus Kepplerites . The Oxfordian
17024-509: Was over a long period incorporated into the kingdom of Wessex and the jurisdiction of the bishop of Wessex. Saint Petroc is said to have passed through Devon, where ancient dedications to him are even more numerous than in Cornwall: a probable seventeen (plus Timberscombe just over the border in Somerset), compared to Cornwall's five. The position of churches bearing his name, including one within
17157-425: Was over £26 billion, larger than either Manchester, or Edinburgh. A 2021 report states that "health, retail and tourism account for 43.1% of employment. Agriculture, education, manufacturing, construction and real estate employment are also over-represented in Devon compared with nationally". Jurassic The start of the Jurassic was marked by the major Triassic–Jurassic extinction event , associated with
17290-406: Was present in the Northern Hemisphere during both the early Pliensbachian and the latest Pliensbachian. There was a spike in global temperatures of around 4–8 °C (7–14 °F) during the early part of the Toarcian corresponding to the Toarcian Oceanic Anoxic Event and the eruption of the Karoo-Ferrar large igneous provinces in southern Gondwana, with the warm interval extending to the end of
17423-440: Was ratified in 2000. The beginning of the Sinemurian is defined by the first appearance of the ammonite Vermiceras quantoxense . Albert Oppel in 1858 named the Pliensbachian Stage after the hamlet of Pliensbach in the community of Zell unter Aichelberg in the Swabian Alb , near Stuttgart , Germany. The GSSP for the base of the Pliensbachian is found at the Wine Haven locality in Robin Hood's Bay , Yorkshire , England, in
17556-430: Was ratified in 2021. The boundary is defined by the first appearance of ammonites marking the boreal Bauhini Zone and the subboreal Baylei Zone. The Tithonian was introduced in scientific literature by Albert Oppel in 1865. The name Tithonian is unusual in geological stage names because it is derived from Greek mythology rather than a place name. Tithonus was the son of Laomedon of Troy and fell in love with Eos ,
17689-431: Was very similar to that found in Cornish 'tre-' settlements, however these are generally described with the local placename -(a)cott , from the Old English for homestead, cf. cottage . Saxon endings in -worthy (from Anglo-Saxon worthig ) indicate larger settlements. Several 'Bere's indicate Anglo-Saxon wood groves, as 'leighs' indicate clearings. Devon has a variety of festivals and traditional practices, including
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