Isle of Portland

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Portland (Isle of Portland)
Flag of Isle of Portland.gif
Portland (Isle of Portland) is located in Dorset
Portland (Isle of Portland)
Portland (Isle of Portland)
 Portland (Isle of Portland) shown within Dorset
Population 12,400 [1][A]
OS grid reference SY690721
   – London 200 km (120 mi) ENE 
District Weymouth and Portland
Shire county Dorset
Region South West
Country England
Sovereign state United Kingdom
Post town PORTLAND
Postcode district DT5
Dialling code 01305
Police Dorset
Fire Dorset
Ambulance South Western
EU Parliament South West England
UK Parliament South Dorset
List of places

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The Isle of Portland is a limestone tied island, 6 kilometres (4 mi) long by 2.7 kilometres (1.7 mi) wide, in the English Channel.[2] Portland is 8 kilometres (5 mi) south of the resort of Weymouth, forming the southernmost point of the county of Dorset, England. A barrier beach over which runs the A354 road connects it to Chesil Beach and the mainland. Portland and Weymouth together form the borough of Weymouth and Portland. The population of Portland is 12,400.

Portland is a central part of the Jurassic Coast, a World Heritage Site on the Dorset and east Devon coast, important for its geology and landforms. Its name is used for one of the British Sea Areas, and has been exported as the name of North American and Australian towns. Portland stone, famous for its use in British and world architecture, including St Paul's Cathedral and the United Nations Headquarters, continues to be quarried.

Portland Harbour, in between Portland and Weymouth, is one of the largest man-made harbours in the world. The harbour was made by the building of stone breakwaters between 1848 and 1905. From its inception it was a Royal Navy base, and played prominent roles during the First and Second World Wars; ships of the Royal Navy and NATO countries worked up and exercised in its waters until 1995. The harbour is now a civilian port and popular recreation area, and was used for the 2012 Olympic Games.


Portland Castle was built to defend Portland in the 16th century.

Portland has been inhabited since at least the Mesolithic period (the Middle Stone Age)—there is archaeological evidence of Mesolithic inhabitants at the Culverwell Mesolithic Site, near Portland Bill,[3] and of habitation since then. The Romans occupied Portland, reputedly calling it Vindelis.[4][5] The Viking pirates' first raid on England occurred in Portland in 787 AD, as recorded in the Anglo-Saxon Chronicle.[6] They were Northmen from Hordaland (the district around Hardanger fjord in west Norway). In 1539 King Henry VIII ordered the construction of Portland Castle for defence against attacks by the French; the castle cost £4,964.[7] It is one of the best preserved castles from this period, and is opened to the public by the custodians English Heritage.[8]

Sir Christopher Wren, the architect and Member of Parliament for nearby Weymouth, used six million tons of white Portland limestone to rebuild destroyed parts of London after the Great Fire of London of 1666. Well-known buildings in the capital, including St Paul's Cathedral[9] and the eastern front of Buckingham Palace feature the stone.[10] After the First World War, a quarry was opened by The Crown Estate to provide stone for the Cenotaph in Whitehall and half a million gravestones for war cemeteries,[5] and after the Second World War hundreds of thousands of gravestones were hewn for soldiers who had fallen on the Western Front.[5] Portland cement has nothing to do with Portland; it was so named due to its similar colour to Portland stone when mixed with lime and sand.[11]

A map of the Isle of Portland from 1937, showing the railway to Easton

There have been railways in Portland since the early 19th century. The Merchant's Railway was the earliest—it opened in 1826 (one year after the Stockton and Darlington railway) and ran from the quarries at the north of Tophill to a pier at Castletown, from where the Portland stone was shipped around the country.[12] The Weymouth and Portland Railway was laid in 1865, and ran from a station in Melcombe Regis, across the Fleet and along the low isthmus behind Chesil Beach to a station at Victoria Square in Chiswell.[13] At the end of the 19th century the line was extended to the top of the island as the Easton and Church Ope Railway, running through Castletown and ascending the cliffs at East Weares, to loop back north to a station in Easton.[12] The line closed to passengers in 1952, and the final goods train (and two passenger 'specials') ran in April 1965.[13]

The Royal National Institution for the Preservation of Life from Shipwreck stationed a lifeboat at Portland in 1826, which was withdrawn in 1851.[14] Coastal flooding has affected Portland's residents and transport for centuries—the only way off the island by land is along the causeway in the lee of Chesil Beach. At times of extreme floods (about every 10 years) this road link is cut by floods. The low-lying village of Chiswell used to flood on average every 5 years. Chesil Beach occasionally faces severe storms and massive waves, which have a fetch across the Atlantic Ocean.[15] Following two severe flood events in the 1970s, Weymouth and Portland Borough Council and Wessex Water decided to investigate the structure of the beach, and coastal management schemes that could be built to protect Chiswell and the beach road. In the 1980s it was agreed that a scheme to protect against a one-in-five year storm would be practicable; it would reduce flood depth and duration in more severe storms.[15] Hard engineering techniques were employed in the scheme, including a gabion running 550 metres (600 yd)[16] to the north of Chiswell, an extended sea wall in Chesil Cove, and a culvert running from inside the beach, underneath the beach road and into Portland Harbour, to divert flood water away from low-lying areas.[15]

Portland Harbour was home to the Royal Navy. Their former barracks are in the foreground.

At the start of the First World War, HMS Hood was sunk in the passage between the southern breakwaters to protect the harbour from torpedo and submarine attack.[17] Portland Harbour was formed (1848–1905) by the construction of breakwaters, but before that the natural anchorage had hosted ships of the Royal Navy for more than 500 years. It was a centre for Admiralty research into asdic submarine detection and underwater weapons from 1917 to 1998; the shore base HMS Serepta was renamed HMS Osprey in 1927.[18] During the Second World War Portland was the target of heavy bombing, although most warships had moved north as Portland was within enemy striking range across the Channel. Portland was a major embarkation point for Allied forces on D-Day in 1944. Early helicopters were stationed at Portland in 1946–1948, and in 1959 a shallow tidal flat, The Mere, was infilled, and sports fields taken to form a heliport. The station was formally commissioned as HMS Osprey, which then became the largest and busiest military helicopter station in Europe. The base was gradually improved with additional landing areas and one of England's shortest runways, at 229 metres (751 ft).[18] There are still two prisons on Portland: HMP The Verne, which until 1949 was a huge Victorian military fortress, and a Young Offenders' Institution (HMYOI) on the Grove clifftop. This was the original prison built for convicts who quarried stone for the Portland Breakwaters from 1848. For a few years until 2005 Britain's only prison ship, HMP The Weare, was berthed in the harbour.

The naval base closed after the end of the Cold War in 1995, and the Royal Naval Air Station closed in 1999, although the runway remains in use for Her Majesty's Coastguard Search and Rescue flights as MRCC Portland.[18] MRCC Portland's area of responsibility extends midway across the English Channel, and from Start Point in Devon to the Dorset/Hampshire border, covering an area of around 10,400 square kilometres (4,000 sq mi).[19] The 12 Search and Rescue teams in the Portland area dealt with almost 1000 incidents in 2005.[20]


Weymouth and Portland shown in Dorset

Portland is an ancient Royal Manor, and until the 19th century remained a separate liberty within Dorset for administration purposes. It was an urban district from 1894 to 1974, until the borough of Weymouth and Portland formed on 1 April 1974 under the Local Government Act 1972. This merged the borough of Weymouth and Melcombe Regis with Portland urban district. For local elections the borough is divided into 15 wards, and three of them cover Portland.[21] Elections take place in a four-year cycle; one third of the councillors in all but three wards retire or seek re-election in years one, two and three, and county council elections are held in year four.[22]

The Mayor of Weymouth and Portland is Ray Banham (Liberal Democrat), Kate Wheller (Labour Party) is Deputy Mayor.[23] Weymouth, Portland and the Purbeck district are in the South Dorset parliamentary constituency, created in 1885. The constituency elects one Member of Parliament; the current MP is Richard Drax (Conservative).[24] South Dorset, the rest of the South West England, and Gibraltar are in the South West England constituency of the European Parliament.[25]

Weymouth and Portland have been twinned with the town of Holzwickede in North Rhine-Westphalia, Germany since 1986,[26] and the French town of Louviers, in the department of Eure in Normandy, since 1959.[27] The borough and nearby Chickerell have been a Fairtrade Zone since 2007.[28]


Terraced Portland Stone houses in Fortuneswell, Underhill
Isle of Portland from the air

The Isle of Portland lies in the English Channel, 3 kilometres (2 mi) south of Wyke Regis, and 200 km (120 mi) west-southwest of London, at Lua error in Module:Coordinates at line 668: callParserFunction: function "#coordinates" was not found. (50.55, −2.44). Portland is situated approximately halfway along the UNESCO Jurassic Coast World Heritage Site; the site includes 153 kilometres (95 mi) of the Dorset and east Devon coast that is important for its geology and landforms.[29] The South West Coast Path runs around the coast; it is the United Kingdom's longest national trail at 1,014 kilometres (630 mi). Portland is unusual as it is connected to the mainland at Abbotsbury by Chesil Beach, a tombolo which runs 29 kilometres (18 mi) north-west to West Bay.[30] Portland is sometimes defined incorrectly as a tombolo—in fact Portland is a tied island, and Chesil Beach is the tombolo (a spit joined to land at both ends).[31]

There are eight settlements on Portland, the largest being Fortuneswell in Underhill and Easton on Tophill. Castletown and Chiswell are the other villages in Underhill, and Weston, Southwell, Wakeham and the Grove are on the Tophill plateau. Many old buildings are built out of Portland Stone; Several parts have been designated Conservation Areas to preserve the unique character the older settlements which date back hundreds of years. The architecture; the natural and man-made environment and the proximity to the sea give Portland overall character which is quite distinct.

The Isle of Portland has been designated by Natural England as National Character Area 137. It is adjoined by the Weymouth Lowlands to the north.[32]


The Isle of Portland lies on Upper Oolite limestone.

Geologically, Portland is separated into two areas; the steeply sloping land at its north end called Underhill, and the larger, gently sloping land to the south, called Tophill. Portland stone lies under Tophill; the strata decline at a shallow angle of around 1.5 degrees, from a height of 151 metres (495 ft) near the Verne in the north, to just above sea level at Portland Bill.[33] The geology of Underhill is different to Tophill; Underhill lies on a steep escarpment composed of Portland Sand, lying above a thicker layer of Kimmeridge Clay, which extends to Chesil Beach and Portland Harbour. This Kimmeridge Clay has resulted in a series of landslides, forming West Weares and East Weares.[33]

2.4 kilometres (1.5 mi) underneath south Dorset lies a layer of Triassic rock salt, and Portland is one of four locations in the United Kingdom where the salt is thick enough to create stable cavities.[34][35] Portland Gas applied to excavate 14 caverns to store 1,000,000,000 cubic metres (3.5×1010 cu ft) of natural gas, which is one percent of the UK's total annual demand.[34][35] It was proposed that the caverns should be connected to the National gas grid at Mappowder via a 37-kilometre (23 mi) pipeline.[34][35] Plans had it that the surface facilities should be complete to store the first gas in 2011, and the entire cavern space available for storage in winter 2013.[35] As part of the £350 million scheme,[34] the Grade II listed former Old Engine Shed would be converted into a £1.5 million educational centre with a café and an exhibition space about the geology of Portland.[36] However, as of 2014, these plans are on hold.

Portland Bill

Portland Bill Lighthouse and visitors' centre

Portland Bill is the southern tip of the island of Portland. The Bill has three lighthouse towers: The Higher Lighthouse is now a dwelling and holiday apartments; the Lower Lighthouse is now a bird observatory and field centre which opened in 1961. The white and red lighthouse on Bill Point replaced the Higher and Lower Lighthouses in 1906. It is a prominent and much photographed feature; an important landmark for ships passing the headland and its tidal race. The current lighthouse was refurbished in 1996 and became remotely controlled. It now contains a visitors' centre giving information and guided tours of the lighthouse.[37] As of June 2009, the lighthouse uses a 1 kW metal-halide US-made lamp with an operational life of about 4000 hours, or 14 months. Two earlier lighthouses stand further inland: one is an important observatory used by ornithologists, providing records of bird migration and accommodation for visitors.[37][38]

Portland Ledge (the Shambles) is an underwater extension of Portland Stone into the English Channel at a place where the depth of Channel is 20 to 40 metres (about 10 to 20 fathoms). Tidal flow is disrupted by the feature; at 10 metres (about 5 fathoms) deep and 2.4 kilometres (1.3 nmi) long, it causes a tidal race to the south of Portland Bill, the so-called Portland Race.[39] The current only stops for brief periods during the 12½ hour tidal cycle and can reach 4 metres per second (8 kn) at the spring tide of 2 metres (6 ft 7 in).[39]


Portland's cliffs and quarries have extensive specialised flora and fauna.

Due to its isolated coastal location, the Isle of Portland has an extensive range of flora and fauna; the coastline and disused quarries are designated as Sites of Special Scientific Interest.[29][38] Sea and migratory birds occupy the cliffs in different seasons, sometimes these include rare species which draw ornithologists from around the country.[29][40] Rare visitors to the surrounding seas include dolphins, seals and basking sharks.[38] Chesil Beach is one of only two sites in Britain where the Scaly Cricket can be found; unlike any other cricket it is wingless and does not sing or hop.[40] Ten British Primitive goats were introduced to the East Weares part of the island to control scrub in 2007.[41]

The comparatively warm and sunny climate allows species of plants to thrive which do not on the mainland. The limestone soil has low nutrient levels; hence smaller species of wild flowers and grasses are able to grow in the absence of larger species.[38] Portland Sea Lavender can be found on the higher sea cliffs—unique to Portland it is one of the United Kingdom's rarest plants.[42] The wild flowers and plants make an excellent habitat for butterflies; over half of the British Isles' 57 butterfly species can be seen on Portland, including varieties that migrate from mainland Europe.[29] Species live on Portland that are rare in the United Kingdom, including the limestone race of the Silver Studded Blue.[43]


The mild seas which almost surround the tied island produce a temperate climate (Köppen climate classification Cfb) with a small variation in daily and annual temperatures. The average annual mean temperature from 1981 to 2010 was 11.2 °C (52.2 °F).[44] The warmest month is August, which has an average temperature range of 14.5 to 19.3 °C (58.1 to 66.7 °F), and the coolest is February, which has a range of 4.0 to 8.0 °C (39.2 to 46.4 °F).[44] Maximum and minimum temperatures throughout the year are above England's average,[45] and Portland is in AHS Heat zone 1.[B] Mean sea surface temperatures range from 7.0 °C (44.6 °F) in February to 17.2 °C (63.0 °F) in August; the annual mean is 11.8 °C (53.2 °F).[46]

Isle of Portland climatic averages
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Average maximum
temperature; °C (°F)
Average mean
temperature; °C (°F)
Average minimum
temperature; °C (°F)
Average sunshine
hours; per month (per day)
Average sea temperature;
°C (°F)
Average rainfall;
mm (inches)
Days of rainfall ≥ 1 mm 12.4 9.8 9.6 8.5 8.2 6.6 6.6 7.1 7.8 11.5 12.4 12.0 112.5
1981–2010 averages for the Isle of Portland climate station and Weymouth Cefas station. Sources: Met Office[47] and Cefas[46]
Climatic ergograph for the nearby Wyke Regis weather station

The mild seas that surround Portland act to keep night-time temperatures above freezing, making winter frost rare: on average 9.6 days per year — this is far below the United Kingdom's average annual total of 55.6 days of frost.[44][48] Days with snow lying are equally rare: on average zero to six days per year;[49] almost all winters have one day or less with snow lying. It may snow or sleet in winter, yet it almost never settles on the ground—coastal areas in South West England such as Portland experience the mildest winters in the UK.[50] Portland is less affected by the Atlantic storms that Devon and Cornwall experience. The growing season lasts for more than 310 days per year,[51][D] and the borough is in Hardiness zone 9b.[52][E]

Weymouth and Portland, and the rest of the south coast,[53] has the sunniest climate in the United Kingdom.[29][54] Portland averaged 1798.9 hours of sunshine annually between 1981 and 2010,[44] which is 41% of the maximum possible,[C] and 34% above the United Kingdom average of 1339.7 hours.[48] December is the cloudiest month (59.7 hours of sunshine), October and November the joint wettest (81.6 millimetres (3.2 in) of rain) and July is the sunniest and driest month (236.9 hours of sunshine, 35.1 millimetres (1.4 in) of rain).[44] Sunshine totals in all months are well above the United Kingdom average,[48] and monthly rainfall totals throughout the year are less than the UK average, particularly in summer;[48] this summer minimum of rainfall is not experienced away from the south coast of England.[53] The average annual rainfall of 667.9 millimetres (26.3 in) is well below the UK average of 1,125 millimetres (44.3 in).[48]


Religion  %[55][F]
Buddhist 0.4
Christian 61.0
Hindu 0.1
Jewish 0.1
Muslim 0.5
No religion 29.3
Other 0.7
Sikh 0.1
Not stated 7.9
Age Percentage[1]
0–15 18.1
16–17 2.4
18–44 33.5
45–59 21.9
60–84 21.7
85+ 2.3
Year Population[1]
1971 12,330
1981 12,410
1991 13,190
2001 12,800
2010 12,400[A]

The mid-year population of Portland in 2010 was 12,400;[A] this figure has remained around twelve to thirteen thousand since the 1970s. In 2010 there were 5,786 dwellings in an area of 11.5 square kilometres (2,840 acres), giving an approximate population density of 1100 people per km2 (4.5 per acre).[1] The population is almost entirely native to England—94.9 percent of residents are of white British ethnicity, well above the England and Wales average of 80.5 percent.[55] The average price of a detached house on Portland in 2010 was £194,200; terraced houses are cheaper, at £149,727, and an apartment or maisonette costs £110,500.[1][G]

Crime rates are below average—there were 5.4 burglaries per 1000 households in 2009 and 2010; which is lower than South West England (7.6 per 1000) and significantly lower than England and Wales (11.6 per 1000).[1] Unemployment levels are very low, at 1.9 percent in July 2011,[1] compared to the United Kingdom average of 7.7 percent.[56] The most common religious identity in Weymouth and Portland is Christianity, at 61.0 percent, which is slightly above the England and Wales average of 59.3 percent.[55] The next-largest sector is those with no religion, at 29.3 percent, also slightly above the average of 25.1 percent.[55]


The A354 links Portland to the main road network and other transport services in Weymouth.

The A354 road is the only land access to Portland, via Ferry Bridge, connecting to Weymouth and to the wider road network at the A35 trunk road in Dorchester. It runs from Easton, splitting into a northbound section through Chiswell and a southbound section through Fortuneswell, then along Chesil Beach and across a bridge to the mainland in Wyke Regis. Formerly a branch line railway, connecting to the South West Main Line near Weymouth railway station, also crossed to the island. The corridor is now a cycle path connecting Fortuneswell with Weymouth and a wider network of traffic-free cycle paths.

Local buses are run by FirstGroup, with services to Weymouth.[57] Weymouth is the hub for south Dorset bus routes, with services to Dorchester and local villages.[57] Weymouth is connected to towns and villages along the Jurassic Coast by the Jurassic Coast Bus service, which runs for 142 kilometres (88 mi) from Exeter to Poole, through Sidford, Beer, Seaton, Lyme Regis, Charmouth, Bridport, Abbotsbury, Weymouth, Wool, and Wareham.[58] Trains run from Weymouth to London, Southampton and Bristol, and ferries to the French port of St Malo and the Channel Islands of Guernsey and Jersey.[59]

There is a short airstrip and heliport in Osprey Quay, just north of Fortuneswell.


St George's Community Primary School is located in Easton. The only other school on Portland is the Isle of Portland Aldridge Community Academy, an all-through school and sixth form for pupils aged 3 to 19 based over 4 different sites. Isle of Portland Aldridge Community Academy was formed in 2012 by merging four primary schools and one secondary school.

Some students commute to Weymouth to study A-Levels, or to attend other secondary schools nearby. Weymouth College in Melcombe Regis is the nearest further education college, which has around 7,500 students from south west England and overseas,[60] about 1500 studying A-Level courses.[61]


Sport and recreation

In 2000, the Weymouth and Portland National Sailing Academy was built in Osprey Quay in Underhill as a centre for sailing in the United Kingdom. Weymouth and Portland's waters were credited by the Royal Yachting Association as the best in Northern Europe.[62] Weymouth and Portland regularly host local, national and international sailing events in their waters; these include the J/24 World Championships in 2005, trials for the 2004 Athens Olympics, the ISAF World Championship 2006, the BUSA Fleet Racing Championships, and the RYA Youth National Championships.[63]

In 2005, the WPNSA was selected to host sailing events at the 2012 Olympic Games—mainly because the Academy had recently been built, so no new venue would have to be provided.[64] However, as part of the South West of England Regional Development Agency's plans to redevelop Osprey Quay, a new 600-berth marina and an extension with more on-site facilities were built.[65] Construction was scheduled between October 2007 and the end of 2008, and with its completion and formal opening on 11 June 2009, the venue became the first of the 2012 Olympic Games to be completed.[66][67][68][69][70]

Weymouth Bay and Portland Harbour are used for other water sports — the reliable wind is favourable for wind and kite-surfing. Chesil Beach and Portland Harbour are used regularly for angling, diving to shipwrecks, snorkelling, canoeing, and swimming.[71] The limestone cliffs and quarries are used for rock climbing; Portland has areas for bouldering and deep water soloing, however sport climbing with bolt protection is the most common style.[72] Since June 2003 the South West Coast Path National Trail has included 21.3 kilometres (13.2 mi) of coastal walking around the Isle of Portland, including following the A354 Portland Beach Road twice.[73]

Isle of Portland has a Non-League football club Portland United F.C. who play at Grove Corner. They also have a very successful youth set up called Portland United youth football Club who provide active team sport for over 170 children on the Island.


Accidents in Portland's quarries led to a fear of the word rabbit.

Rabbits have long been associated with bad luck on Portland; use of the name is still taboo—the creatures are often referred to as "Underground Mutton", "Long-Eared Furry Things" or just "bunnies".[74] The origin of this superstition is obscure (there is no record of it before the 1920s) but it is believed to derive from quarry workers: they would see rabbits emerging from their burrows immediately before a rock fall and blame them for increasing the risk of dangerous, sometimes deadly, landslides.[75] If a rabbit was seen in a quarry, the workers would pack up and go home for the day, until the safety of the area had been assured.[74] Local fishermen too would refuse to go to sea if the word was mentioned.

Even today older Portland residents are 'offended' (sometimes for the benefit of tourists) by the mention of rabbits;[75] this superstition came to national attention in October 2005 when a special batch of advertisement posters were made for the Wallace and Gromit film, The Curse of the Were-Rabbit. In respect for local beliefs the adverts omitted the word 'rabbit' and replaced the film's title with the phrase "Something bunny is going on".[74]


Thomas Hardy called Portland the Isle of Slingers in his novels; the isle was the main setting of The Well-Beloved (1897), and was featured in The Trumpet-Major (1880).[76] The cottage that now houses Portland Museum was the inspiration for the heroine's house in The Well-Beloved. Portlanders were expert stone-throwers in the defence of their land, and Hardy's Isle of Slingers is heavily based on Portland; the Street of Wells representing Fortuneswell and The Beal Portland Bill. Hardy named Portland the Gibraltar of the North, with reference to its similarities with Gibraltar; its physical geography, isolation, comparatively mild climate, and Underhill's winding streets.[77]

Hilaire Belloc's book The Cruise of the "Nona" is about sailing near Portland, and the reflections it occasions. He describes Portland Race as "the master terror of our world", and says "... if you were to make a list of all the things which Portland Race has swallowed up, it would rival Orcus".[78][79]

In Museums Without Walls, Jonathan Meades declares that "Portland is a bulky chunk of geological, social, topographical and demographic weirdness. It is the obverse of a beauty spot. 'Beauty' in this construction implies the picturesque. Portland is gloriously bereft of this quality. It is awesome. There is nothing pretty about it."[80]

In The Warlord Chronicles (1995–97), Bernard Cornwell makes Portland the Isle of the Dead, a place of internal exile, where the causeway was guarded to keep the 'dead' (people suffering insanity) from crossing the Fleet and returning to the mainland. No historical evidence exists to support this idea.[81]

The Portland Chronicles series of four children's books, set on and around Portland and Weymouth and written by local author Carol Hunt, draw on local history to explore a seventeenth century world of smuggling, witchcraft, piracy and local intrigue.[82]


Bunnies: (see above).

Kimberlin: slang for any 'strangers' who live on the island but are not from the Island.[83]

Portland screw: fossil mollusc (Aptyxiella portlandica) with a long screw-like shell or its cast.[84]

Notable persons born here

See also

References and notes

A This figure is an estimate for mid-2010.
B Areas in American Horticultural Society Heat Zone 1 experience less than one day per year with maximum temperatures above 30 °C (86 °F).[85]
C The maximum hours of sunshine possible in one year is approximately 4383 hours (12 hours/day × 365.25 days).
D The growing season in the United Kingdom is defined as starting on the day after five consecutive days with mean temperatures above 5 °C (41 °F). The season finishes the day after mean temperatures are below 5 °C (41 °F) for five consecutive days.[86]
E Areas in Hardiness zone 9 experience an average lowest recorded temperature each year between −6.6 and −1.1 °C (20.1 and 30.0 °F).[87]
F Figures are for Weymouth and Portland as a whole.
G These figures are for July to September in 2010.
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Further reading

  • Anon 1905, The Portland Year Book and Island Record 1905, reprinted 2004, Portland Museum, Portland, Dorset
  • Theresa Murphy, Murder in Dorset 1988. Robert Hale Limited, London - Portland chapters
  • Stuart Morris, 1985 Portland, an Illustrated History The Dovecote Press, Wimborne, Dorset: ISBN 0-946159-34-3
  • Stuart Morris, 1998 Portland (Discover Dorset Series) The Dovecote Press, Wimborne, Dorset: ISBN 1-874336-49-0.
  • Jackson, Brian L. 1999. Isle of Portland railways. ISBN 0-85361-540-3
  • Palmer, Susann. 1999. Ancient Portland: Archaeology of the Isle. Portland: S. Palmer. ISBN 0-9532811-0-8
  • Stuart Morris, 2002 Portland: A Portrait in Colour The Dovecote Press, Wimborne, Dorset: ISBN 1-874336-91-1.
  • Stuart Morris, 2006 Portland, Then and Now The Dovecote Press, Wimborne, Dorset: ISBN 1-904349-48-X.
  • Dorset: The Royal Navy Stuart Morris, 2011, The Dovecote Press, Wimborne, Dorset: ISBN 978-1-904349-88-4. Features Portland.
  • Weymouth & Portland, Stuart Morris 2012. The Dovecote Press, Wimborne, Dorset: ISBN 978-1-904349-98-3.
  • Stone to Build London - Portland's Legacy, Gill Hackman 2014. Folly Books Ltd, Monkton Farleigh, Wilts: ISBN 978-0-9564405-9-4

External links