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Raisby Hill Grassland

County Durham geography stubsEnglish Site of Special Scientific Interest stubsKelloeNature reserves of the Durham Wildlife TrustSites of Special Scientific Interest in County Durham

Raisby Hill Grassland is a Site of Special Scientific Interest in east County Durham, England. It lies just over 1 km east of the village of Coxhoe. The site consists of a small disused quarry and the undisturbed part of Raisby Hill, as well as a small area of wetland alongside Raisby Beck. It formed part of the Raisby Hill Quarry SSSI until 1984 when it was removed and, with some expansion of the area, notified as a separate SSSI. In the undisturbed part of Raisby Hill primary magnesian limestone grassland is the main vegetation type. Blue moor-grass, Sesleria albicans, is abundant, and there is a rich assemblage of species characteristic of calcareous soils, such as quaking grass, Briza media, meadow oat grass, Avenula pratensis, glaucous sedge, Carex flacca, and fragrant orchid, Gymnadenia conopsea. The skeletal soils in the abandoned quarry at the southwestern end of the site support the largest population of dark-red helleborine, Epipactis atrorubens, in County Durham. Other species found here include rock rose, Helianthemum nummularium, frog orchid, Coeloglossum viride, and pyramidal orchid, Anacamptis pyramidalis. The site supports a breeding population of Durham Argus butterfly, Aricia artaxerxes salmacis, a form which is only found in the magnesian limestone areas of Durham.

Excerpt from the Wikipedia article Raisby Hill Grassland (License: CC BY-SA 3.0, Authors).

Raisby Hill Grassland
Kelloe Way,

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N 54.713055555556 ° E -1.4808333333333 °
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Raisby Hill Grassland nature reserve

Kelloe Way
DH6 4PB , Kelloe
England, United Kingdom
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Bishop Middleham Quarry
Bishop Middleham Quarry

Bishop Middleham Quarry is a disused quarry, about 4 kilometres (2.5 mi) north-west of Sedgefield, County Durham, England. Quarry-working here ceased in 1934, and the site has since been colonised by vegetation. The underlying rock is Magnesian Limestone and this has had a strong influence in determining the range of plant and animal communities now found there. In 1968 the quarry was designated as a biological Site of Special Scientific Interest (SSSI). The SSSI boundaries were revised in 1982 to exclude areas which were no longer found to have high wildlife interest due to tipping and quarry reworking. The site contains a variety of vegetation types including woodland, scrub, and several grassland communities. The most important part of the site from a biodiversity conservation perspective is the species-rich unimproved magnesian limestone grassland, which covers just under 4.6 hectares (11 acres) of the site. Only 270 hectares (670 acres) of this habitat exist in Britain, two-thirds of it in County Durham. Magnesian limestone grassland supports an assemblage of calcicolous plants adapted to growing in thin soils with a short sward. The quarry holds one of the largest British populations of the dark red helleborine, Epipactis atrorubens; a survey in 2010 found nearly 1700 flowering spikes of this nationally rare species. The quarry is a breeding site for the Durham argus butterfly, a local race of the brown argus found only in northeast England. The site attracted the interest of birdwatchers in 2002 when a pair of European bee-eaters took up residence, raising two young, only the third breeding attempt ever in Britain. Bishop Middleham Quarry is managed as a Nature Reserve by the Durham Wildlife Trust.

Cassop Vale
Cassop Vale

Cassop Vale is a Site of Special Scientific Interest in the Durham City district of County Durham, England. It lies between the villages of Bowburn and Cassop, 7 km south-east of the centre of Durham.. The site is important as one of the larger areas of grassland developed on magnesium limestone. This rock has a restricted distribution in England and grassland associated with it is confined almost entirely to south-east Tyneside and County Durham, usually in small, scattered patches that are threatened by quarrying and modern agricultural practices. Habitats at Cassop Vale include grassland, scrub, woodland and wetland, the last fed by spring-lines. The area also includes recolonised open quarries and mine spoil-heaps, which add to the floral diversity. The main grass species on the magnesian limestone is blue moor-grass Sesleria albicans amongst which grow fragrant orchid Gymnadenia conopsea, cowslip, Primula veris, rock rose Helianthemum nummularium, and quaking grass, Briza media. Several rare and local species are present, including globeflower, Trollius europaeus, birds's-eye primrose, Primula farinosa, lesser club-moss, Selaginella selaginoides, and moonwort, Botrychium lunaria. Elsewhere there is neutral grassland with red fescue and such herbs as cat’s-ear, earthnut and knapweed.The scrub is dominated by hawthorn, gorse and hazel and on the basic soils grow woodruff, dog's mercury and sanicle. The small flushes on the springline are dominated by rushes and sedges, but are also home to marsh valerian, marsh ragwort, ragged robin and northern marsh-orchid. The wetlands are fringed by common spike-rush, soft rush and greater willow-herb.The site also supports a diverse invertebrate fauna that includes populations of the Durham argus butterfly, Aricia artaxerxes salmacis, and the least minor moth Photedes captiuncula.