Thrislington Plantation is a

Site of Special Scientific Interest A Site of Special Scientific Interest (SSSI) in Great Britain or an Area of Special Scientific Interest (ASSI) in the Isle of Man and Northern Ireland is a conservation designation denoting a protected area in the United Kingdom and Isle of ...

and a national nature reserve in the

Sedgefield Sedgefield is a market town and civil parish in County Durham, England. It had a population of 5,211 as at the 2011 census. It has the only operating racecourse in County Durham. History Roman A Roman 'ladder settlement' was discovered by C ...

district of

County Durham County Durham ( ), officially simply Durham,UK General Acts 1997 c. 23Lieutenancies Act 1997 Schedule 1(3). From legislation.gov.uk, retrieved 6 April 2022. is a ceremonial county in North East England.North East Assembly �About North East E ...

England England is a country that is part of the United Kingdom. It shares land borders with Wales to its west and Scotland to its north. The Irish Sea lies northwest and the Celtic Sea to the southwest. It is separated from continental Europe b ...

. It is situated about 1 km east of

Ferryhill Ferryhill is a town in County Durham, England, with an estimated population in 2018 of 9,362. The town grew in the 1900s around the coal mining industry. The last mine officially closed in 1968. It is located between the towns of Bishop Auckland ...

, between the

East Coast Main Line The East Coast Main Line (ECML) is a electrified railway between London and Edinburgh via Peterborough, Doncaster, York, Darlington, Durham and Newcastle. The line is a key transport artery on the eastern side of Great Britain running broa ...

railway and the

A1(M) A1(M) is the designation given to a series of four separate motorway sections in England. Each section is an upgrade to a section of the A1, a major north–south road which connects London, the capital of England, with Edinburgh, the capit ...

road. The site has one of the most important expanses of primary magnesian

limestone Limestone ( calcium carbonate ) is a type of carbonate sedimentary rock which is the main source of the material lime. It is composed mostly of the minerals calcite and aragonite, which are different crystal forms of . Limestone forms whe ...

grassland in

Great Britain Great Britain is an island in the North Atlantic Ocean off the northwest coast of continental Europe. With an area of , it is the largest of the British Isles, the largest European island and the ninth-largest island in the world. It is ...

. In particular, it has the largest area of the grassland type which is characterised by blue moor-grass, ''

Sesleria albicans ''Sesleria albicans'' is a species of perennial grass in the family Poaceae which can be found throughout Europe. Description The species is perennial and caespitose with erect and slender culms that are long. It have a ligule that goes arou ...

'', and small scabious, ''

Scabiosa columbaria ''Scabiosa columbaria'', called the small scabious or dwarf pincushion flower, is a widespread species of flowering plant in the genus ''Scabiosa'', native to Europe, Africa, and western Asia, from Sweden to Angola. In the garden it is a short-li ...

''. The eastern part of the site is undisturbed grassland which, as well as species commonly associated with magnesian limestone, has a small population of the locally rare mountain everlasting, ''

Antennaria dioica ''Antennaria dioica'' (mountain everlasting, stoloniferous pussytoes, catsfoot or cudweed) is a Eurasian and North American species of flowering plant in the family Asteraceae. It is a perennial herb found in cool northern and mountainous region ...

'', and good populations of dark-red helleborine, ''

Epipactis atrorubens ''Epipactis atrorubens'', the dark-red helleborine or royal helleborine, is an herbaceous plant in the orchid family, Orchidaceae. As with many other species of orchids, the species is legally protected in some countries. Plantlife designated the ...

'', and perennial flax, ''

Linum perenne ''Linum perenne'', the perennial flax, blue flax or lint, is a flowering plant in the family Linaceae, native to Europe, primarily in the Alps and locally in England. It has been introduced into North America, where it can be found on mountain ri ...

'' subsp. ''anglicum'', both of which are nationally scarce. The western part of the site has been disturbed by quarrying and the vegetation here consists of primary turf that was translocated between 1982 and 1990. Although it remains rich in

herb In general use, herbs are a widely distributed and widespread group of plants, excluding vegetables and other plants consumed for macronutrients, with savory or aromatic properties that are used for flavoring and garnishing food, for medicinal ...

s, the characteristic features of magnesian limestone grassland were lost during the translocation: blue moor-grass is uncommon, while coltsfoot, ''

Tussilago farfara ''Tussilago farfara'', commonly known as coltsfoot, is a plant in the tribe Senecioneae in the family Asteraceae, native to Europe and parts of western and central Asia. The name "tussilago" is derived from the Latin ''tussis'', meaning cough, an ...

'', and field sow-thistle, ''

Sonchus arvensis ''Sonchus arvensis'', the field milk thistle, field sowthistle, perennial sow-thistle, corn sow thistle, dindle, gutweed, swine thistle, or tree sow thistle, is a species of flowering plant in the family Asteraceae. ''S. arvensis'' often occurs i ...

'', which entered the grassland during translocation, persist. The area supports a diverse

invertebrate Invertebrates are a paraphyletic group of animals that neither possess nor develop a vertebral column (commonly known as a ''backbone'' or ''spine''), derived from the notochord. This is a grouping including all animals apart from the chordate ...

fauna, which includes the nationally rare least minor moth, '' Photedes captiuncula'', the nationally notable Durham argus butterfly, '' Aricia artaxerxes salmacis'', and the common glow-worm, ''

Lampyris noctiluca ''Lampyris noctiluca'', the common glow-worm of Europe (see also "glowworm"), is the type species of beetle in the genus ''Lampyris'' and the family Lampyridae. ''Lampyris noctiluca'' presents a conspicuous sexual dimorphism. The males are winge ...

''.

Landfill

The adjacent quarry is destined to become a

landfill A landfill site, also known as a tip, dump, rubbish dump, garbage dump, or dumping ground, is a site for the disposal of waste materials. Landfill is the oldest and most common form of waste disposal, although the systematic burial of the waste ...

site.

References

{{SSSIs County Durham Sites of Special Scientific Interest in County Durham Bishop Middleham