List of Sites of Special Scientific Interest in Oxfordshire

Template:Short description Oxfordshire in South East England has an area of 2,605 square kilometres and a population of 648,700. In England, the body responsible for designating Sites of Special Scientific Interest (SSSIs) is Natural England, which is responsible for protecting England's natural environment. Notification as an SSSI gives legal protection to the best sites for wildlife and geology. As of 2020, there are 111 SSSIs in Oxfordshire, 78 of which have been designated for biological interest, 27 for geological interest, and 6 for both biological and geological interest.

Key

Interest

• B = site of biological interest
• G = site of geological interest

Public access

• FP = access to footpaths through the site only
• No = no public access to site
• PP = public access to part of site
• Yes = public access to all or most of the site

Other designations and wildlife trust management

• BBOWT = Berkshire, Buckinghamshire and Oxfordshire Wildlife Trust
• GCR = Geological Conservation Review site
• LNR = Local nature reserve
• NCR = Nature Conservation Review site
• NNR = National nature reserve
• Ramsar = Ramsar site, an internationally important wetland site
• SAC = Special Area of Conservation
• SM = Scheduled monument
• SPA = Special Protection Area

Sites

Site name	Photograph	B	G	AreaTemplate:Efn	Public access	LocationTemplate:Efn	Other	MapTemplate:Efn	CitationTemplate:Efn	Description
Alvescot Meadows		Green tickY				Alvescot		Template:Nature on the map	Citation
Appleton Lower Common	Appleton Lower Common	Green tickY			FP	Appleton		Template:Nature on the map	Citation	The common has diverse broadleaved woodland on Oxford Clay with rides and glades. The shrub layer has a rich variety of species, such as primrose, goldilocks buttercup, early purple orchid, twayblade and wood anemone. Invertebrates include the rare club-tailed dragonfly.
Ardley Cutting and Quarry	Ardley Cutting	Green tickY	Green tickY		PP	Ardley	BBOWT, GCR, SM	Template:Nature on the map	Citation	The quarry and railway cutting exposes rocks dating to the Bathonian stage of the Middle Jurassic, about 167 million years ago. It is described by Natural England as of national importance for the understanding of the Jurassic Period in Britain as it allows correlation of rocks of the Oxford area to be correlated with those of the Midlands. The site has calcareous grassland with diverse vertebrates, including the internationally protected great crested newt.
Ardley Trackways	Ardley Trackways		Green tickY		NO	Bucknell	GCR	Template:Nature on the map	Citation	This site is internationally important because it has trackways created by a herd of sauropod (herbivorous) dinosaurs, together with several carnivorous theropods, along a shoreline dating to the Middle Jurassic, around 165 million years ago. These are the only such trackways in England, and one of the few dating to the Middle Jurassic in the world. The tracks throw light on the behaviour and gait of the dinosaours.
Arncott Bridge Meadows	Arncott Bridge Meadows	Green tickY			NO	Arncott		Template:Nature on the map	Citation	The site is adjacent to the River Ray and in its flood plain. It is old unimproved hay meadows which display medieval ridge and furrow features, showing that it has not been ploughed for centuries. It lies on Oxford Clay, and some areas are seasonally waterlogged. It has a wide variety of plants, including some rare ones, such as the nationally uncommon narrow-leaved water-dropwort, and the river bank also has unusual plants.
Ashdown Park	Ashdown Park	Green tickY			YES	Ashbury		Template:Nature on the map	Citation	The park has been designated an SSSI because of the lichens on its many sarsen boulders. These are in parkland which is heavily grazed to ensure that the lichens, which have taken centuries to grow, do not become shaded. Noteworthy species include Aspicilia caesiocinerea, Buellia saxorum, Candelariella coralliza, Rinodina atrocinerea and Parmelia loxodes.
Aston Rowant	Aston Rowant	Green tickY			YES	Shirburn	NCR NNR SAC	Template:Nature on the mapTemplate:Efn	Citation	This site has beech woodland, scrub and chalk grassland. Unusual plants in the ground flora include wood barley, and the orchids Violet and white helleborine. There are several uncommon species of beetles and moths, and fifty breeding bird species.
Aston Rowant Cutting	Aston Rowant Cutting		Green tickY		YES	Shirburn	GCR	Template:Nature on the map	Citation	This cutting provides the best exposure in central England dating to the Coniacian stage of the Late Cretaceous, approximately 88 million years ago. It is part of the Upper Chalk succession, and at its base there is a fossil rich section which is important in defining the boundary between the Coniacian and the preceding Turonian stage.
Aston Rowant Woods	Aston Rowant Woods	Green tickY			YES	Aston Rowant	NCR NNR SAC	Template:Nature on the mapTemplate:Efn	Citation	The site is described by Natural England as "of national importance as a large, unfragmented area of ancient semi-natural woodland characteristic of the Chilterns scarp". Flora include 52 species indicative of ancient woods, and there are over 100 species of fungi.
Aston Upthorpe Downs	Aston Upthorpe Downs	Green tickY			YES	Aston Upthorpe	NCR	Template:Nature on the map	Citation	This site is a set of dry valleys in the Berkshire Downs. Most of it is chalk grassland which has a rich variety of flora and fauna, and there are also areas of mixed woodland and juniper scrub. Flora include the nationally uncommon wild candytuft and the only population in the county of the rare pasque flower.
Barrow Farm Fen		Green tickY				Marcham		Template:Nature on the map	Citation
Bear, Oveys and Great Bottom Woods	Oveys Wood	Green tickY			FP	Rotherfield Peppard		Template:Nature on the map	Citation	This beech woodland has more than 40 species of ground flora which is commonly associated with ancient woods in southern Britain, including broad-leaved helleborine, southern wood-rush, yellow archangel, enchanter's nightshade, goldilocks buttercup, woodruff and the moss Leucobryum glaucum.
Berins Hill Bank		Green tickY				Ipsden		Template:Nature on the map	Citation
Berrick Trench	Berrick Trench	Green tickY			FP	Swyncombe		Template:Nature on the map	Citation	This is an ancient semi-natural beech wood on the slope of a dry valley in the Upper Chalk. There are many stools of ash, oak, beech, whitebeam, field maple and hazel. Woodland flowering plants include early purple orchid and early dog-violet.
Bestmoor		Green tickY				North Aston		Template:Nature on the map	Citation
Bix Bottom	Bix Bottom	Green tickY			YES	Swyncombe	BBOWT	Template:Nature on the map	Citation	This site has ancient woods which are shown on a map of 1786, together with areas of grassy clearings and scrub. More than 500 species of vascular plant have been recorded, including 18 orchids and the rare meadow clary, which is listed in the British Red Data Book of Plants. There are more than 75 bird species and 650 fungi, including many which are nationally rare.
Blenheim Park	Blenheim Park	Green tickY			YES	Woodstock		Template:Nature on the map	Citation	The park was once an Anglo-Saxon chase and then a twelfth-century deer park. It now has some of the best areas of pasture and oak woodland in the country. The large lakes were created in the eighteenth century, and they are regionally important for breeding and wintering birds. Invertebrates include three rare beetles which are included in the British Red Data Book of Invertebrates, Rhizophagus oblongicollis, Plectophloeus nitidus and Aeletesatomarius.
Bould Wood	Bould Wood	Green tickY			PP	Chipping Norton	BBOWT	Template:Nature on the map	Citation	This site is mainly ancient semi-natural woodland, but it also has two streams, a pond and a wet meadow. The lower plant flora is diverse. Fungi include tricholoma toadstools and Cudoniella clavus, while there are lichens such as Cladonia polydactyla, Catillaria prasina and Graphis scripta.
Brasenose Wood and Shotover Hill	Brasenose Wood and Shotover Hill	Green tickY			YES	Headington	NCR	Template:Nature on the map	Citation	Most Brasenose Wood is a remnant of the ancient Shotover Forest, and it is one of the few woods which is still managed by the traditional method of coppice-with-standards. It has a very diverse ground flora, and 221 species of vascular plant have been recorded, including 46 which are characteristic of ancient woodland. Shotover hill has heath and unimproved grassland. It is described by Natural England as "of outstanding entomological interest", with many rare flies, bees, wasps and ants.
Buckland Warren		Green tickY			NO	Buckland		Template:Nature on the map	Citation	This narrow strip of cultivated land between a wood and a golf course is designated an SSSI because it has a population of the nationally rare broad-leaved cudweed, which has been recorded at less than ten sites in Britain and is listed in the British Red Data Book of Vascular Plants. This annual plant requires disturbance of the soil by ploughing in early to mid October.
Cassington Meadows		Green tickY				Witney	SAC	Template:Nature on the map	Citation
Chimney Meadows	Chimney Meadows	Green tickY			PP	Bampton	BBOWT, NNR	Template:Nature on the map	Citation	This site, which consists of six botanically rich alluvial meadows, is bordered on the south by the River Thames. The meadows are intersected by ditches, most of which are covered in reed canary-grass. The most common grasses are crested dog's-tail, creeping bent, perennial rye-grass, hairy sedge and glaucous sedge.
Chinnor Chalk Pit	Chinnor Chalk Pit		Green tickY		NO	Chinnor	GCR	Template:Nature on the map	Citation	This site is described by Natural England as "important for its excellent exposures Totternhoe Stone", dating to the mid-Cenomanian stage of the Cretaceous period, around 100 million years ago. It has yielded many fossils of ammonites from the Lower and Middle Chalk.
Chinnor Hill	Chinnor Hill	Green tickY			YES	Chinnor	BBOWT	Template:Nature on the map	Citation	This hill has species-rich calcareous grassland, juniper scrub, which is an uncommon habitat, mixed scrub and woodland. More than 300 species of vascular plant have been recorded and 65 of birds. Many passerines breed in the scrub, and thrushes such as redwings and fieldfares feed on berries in the winter.
Cothill Fen	Cothill Fen	Green tickY	Green tickY		PP	Marcham	BBOWT, GCR, NCR, NNR, SAC	Template:Nature on the map	Citation	This site has nationally rare calcareous fen and moss-rich mire habitats and a rich invertebrate fauna, including 25 species in the Red Data Book of Invertebrates. More than 330 vascular plants have been recorded. It is a nationally important site geologically because the sampling the peat gives a picture of the vegetation over the early Holocene, between 10,000 and 6,500 years ago.
Culham Brake		Green tickY				Culham		Template:Nature on the map	Citation
Cumnor			Green tickY			Oxford	GCR	Template:Nature on the map	Citation
Ditchley Road Quarry			Green tickY			Charlbury	GCR	Template:Nature on the map	Citation
Dry Sandford Pit	Dry Sandford Pit	Green tickY	Green tickY		YES	Abingdon	BBOWT, GCR	Template:Nature on the map	Citation	This former sand quarry exposes a sequence of limestone rocks laid down in shallow coastal waters during the Oxfordian stage of the Jurassic, around 160 million years ago. It has many fossil ammonites. It has diverse calcareous habitats, including fen, grassland, scrub and heath. It is nationally important entomologically, especially for bees and wasps.
Ducklington Mead	Ducklington Mead	Green tickY			NO	Ducklington		Template:Nature on the map	Citation	This traditionally managed meadow has diverse flora, such as the rare and declining snake's-head fritillary. Flowering plants in drier areas include saw-wort, dropwort, lady's bedstraw and betony. There are also ditches with interesting wetland flora and an ancient hedge with a variety of shrubs.
Fernham Meadows		Green tickY				Faringdon		Template:Nature on the map	Citation
Frilford Heath, Ponds and Fens	Frilford Heath, Ponds and Fens	Green tickY			PP	Abingdon	BBOWT	Template:Nature on the map	Citation	Natural England describes the acid grassland, heathland and valley fens of this site as unique in southern England. Over 400 vascular plants have been recorded, including some which are nationally rare. There are unusual insects such as the wasp Microdynerus exilis, which was only recognised as native to Britain in the late twentieth century, the red data book of threatened species fly cheilosia mutabalis, and the nationally uncommon Epistrophe diaphana.
Glyme Valley	Glyme Valley	Green tickY			PP	Chipping Norton	BBOWT	Template:Nature on the map	Citation	This linear site runs along two stretches of the valley of the River Glyme, with the upper area encompassing the river's headwaters. The diverse habitats include the river, ponds, fen, marshy grassland, limestone grassland, scrub and wet woodland. There is a large colony of meadow clary, a rare species which is listed in the British Red Data Book of Vascular Plants. There are several badger setts.
Grafton Lock Meadow		Green tickY				Faringdon		Template:Nature on the map	Citation
Hackpen, Warren & Gramp's Hill Downs	Warren Down	Green tickY			YES	Childrey	SM	Template:Nature on the map	Citation	This site consists of three adjacent areas of unimproved chalk grassland, which are managed by close grazing. Warren Down and Gramp's Hill Down are dominated by upright brome, and most of Hackpen Down by red fescue. Eleven species of butterfly have been recorded, including chalkhill blue, brown argus and marbled white.
Harpsden Wood	Harpsden Wood	Green tickY			YES	Henley-on-Thames		Template:Nature on the map	Citation	Most of this ancient wood is on acidic clay with flints, although some areas are on sandy clay or chalky silt. The acid soils have a sparse understorey but there is a diverse ground flora in the calcareous areas. Orchids include broad-leaved helleborine, green-flowered helleborine, bird's-nest orchid and narrow-lipped helleborine.
Hartslock	Hartslock	Green tickY			YES	Goring-on-Thames	BBOWT, SAC	Template:Nature on the map	Citation	This site on the east bank of the River Thames has diverse semi-natural habitats, including species-rich chalk downland, ancient yew woodland, semi-natural broadleaved woodland, riverside fen and scrub. Hartslock Wood is one of the sites listed in 1915 by Charles Rothschild, the founder of the Wildlife Trusts, as "worthy of preservation". The wood has a variety of tree species including beech and yew, and there is a large colony of badgers.
Highlands Farm Pit	Highlands Farm Pit		Green tickY		YES	Henley-on-Thames	GCR	Template:Nature on the map	Citation	The site exposes gravel from the abandoned channel of the River Thames before the Anglian ice age pushed the river south around 450,000 years ago. It may date to the late Anglian Black Park Terrace which would make it the latest known exposure of the gravel floor of the old channel, and therefore of considerable importance. It has revealed large quantities of Palaeolithic flints, which are some of the earliest of their type known. It is described by Natural England as a "crucial site".
Holly Court Bank		Green tickY				Witney		Template:Nature on the map	Citation
Holly Wood	Holly Wood	Green tickY			NO	Oxford		Template:Nature on the map	Citation	This ancient wood is a small remnant of the medieval Royal Forest of Shotover. It is coppice with standards on Oxford Clay with a varied invertebrate fauna. There are several uncommon butterfiles such as the black hairstreak and purple emperor.
Holton Wood	Holton Wood	Green tickY			FP	Oxford		Template:Nature on the map	Citation	This ancient wood was formerly part of Bernwood Forest, which was a medieval hunting forest. It is semi-natural coppice with standards, with fine oak standards of varying ages. It has a rich invertebrate fauna, including 27 species of butterfly, with uncommon species such as white admiral and purple emperor.
Hook Meadow and The Trap Grounds	Hook Meadow and The Trap Grounds	Green tickY			NO	Oxford		Template:Nature on the map	Citation	These unimproved meadows in the floodplain of the River Thames are poorly drained and they have calcareous clay soils. The southern field is the most waterlogged, and its flora includes wetland species such as sharp-flowered rush, marsh arrow grass, common spike-rush and early marsh orchid.
Hook Norton Cutting and Banks	Hook Norton Cutting and Banks	Green tickY	Green tickY		PP	Chipping Norton	BBOWT, GCR	Template:Nature on the map	Citation	Hook Norton Cutting is a nature reserve along two stretches of a disused railway line separated by a tunnel. Most of it is unimproved calcareous grassland with a rich variety of flora. The site is notable for its bee species, including one which has only been recorded at three other sites in the country, Andrena bucephala. The cutting exposes rocks dating to the Middle Jurassic, around 167 million years ago, which are the type section of the Hook Norton Member of the Chipping Norton Formation. Hook Norton Bank is a steeply sloping limestone grassland by the River Swere.
Horsehay Quarries	Horsehay Quarries		Green tickY		NO	Chipping Norton	GCR	Template:Nature on the map	Citation	These quarries expose rocks dating to the Middle Jurassic period. The sequence runs from the Northampton Sand Formation of the Aalenian about 172 million years ago to the Taynton Limestone Formation of the Middle Bathonian around 167 million years ago.
Hurst Hill	Hurst Hill	Green tickY	Green tickY		YES	Cumnor	GCR	Template:Nature on the map	Citation	The site is owned by All Souls College, Oxford, and its mosses and liverworts have been monitored for more than fifty years. The hill is also important geologically. In 1879 a fossil of a Camptosaurus prestwichii, a large herbivorous dinosaur dating to the Upper Jurassic 143 million years ago, was found on the site. The fossil belongs to a typically North African genus, and provides evidence of a land bridge across the proto-Atlantic in the Late Jurassic.
Iffley Meadows	Iffley Meadows	Green tickY			YES	Oxford	BBOWT	Template:Nature on the map	Citation	These flood meadows between two arms of the River Thames are traditionally managed for hay and pasture. A large part of the site is on clay, and it is enriched by silt each year when it is flooded. There is a rich grassland flora, with the outstanding feature being 89,000 snake's head fritillaries, which produce purple flowers in the spring. There is a network of old river channels, ditches and overgrown hedges.
Kirtlington Quarry	Kirtlington Quarry		Green tickY		YES	Kidlington	GCR, LNR	Template:Nature on the map	Citation	Britain has the only five Middle Jurassic mammal sites in the world, and this disused quarry has yielded the richest and most diverse assemblage. It dates to the Upper Bathonian, around 150 million years ago. There are nine therian and prototherians species, together with a tritylodontid. There are also fossils of theropod dinosaurs, crocodilians, pterosaurs, fishes and many shark teeth.
Knightsbridge Lane	Knightsbridge Lane	Green tickY			YES	Watlington		Template:Nature on the map	Citation	This site consists of woodland on the sides of a minor road, which has approximately one tenth of the population in the country of a very rare plant, green hound's tongue. It is listed in the British Red Data Book of vascular plants, and it is found at only seven other locations in Britain. The species is often found in disturbed soils, and may have increased following the clearance of dead elm trees.
Lamb and Flag Quarry			Green tickY			Abingdon	GCR	Template:Nature on the map	Citation
Lambridge Wood	Lambridge Wood	Green tickY			YES	Henley-on-Thames		Template:Nature on the map	Citation	Soil types in the wood vary from calcareous to very acid. The main trees are beech, and other trees include oak, ash and wych elm. The understorey in mainly bramble, and in some areas bracken.
Langley's Lane Meadow		Green tickY				Witney		Template:Nature on the map	Citation
Little Tew Meadows	Little Tew Meadows	Green tickY			FP	Little Tew		Template:Nature on the map	Citation	This site is composed of four adjoining unimproved meadows. One is used for hay while the rest are managed by cattle grazing. Two have prominent ridge and furrow dating to medieval farming practices. There are also extensive flushes and outcrops of limestone around the site of a former quarry.
Little Wittenham	Little Wittenham	Green tickY			YES	Dorchester-on-Thames	SAC	Template:Nature on the map	Citation	This site, which is managed by the Earth Trust, consists of woods, grassland, scrub and ponds on the slope of a hill next to the River Thames. Flora include the nationally scarce greater dodder, and there is a rich assemblage of amphibians, including one of the largest populations in the country of the great crested newt, which is a priority species of the Biodiversity action plan.
Littlemore Railway Cutting	Littlemore Railway Cutting		Green tickY		NO	Oxford	GCR	Template:Nature on the map	Citation	The cutting exposes limestone and clay laid down in mid-Oxfordian stage of the Late Jurassic, around 160 million years ago. The deposit is part of the Stanford Formation, and the clay appears to have been deposited in a channel between coral reefs which then covered the Oxford area.
Littleworth Brick Pit			Green tickY			Oxford	GCR	Template:Nature on the map	Citation
Long Hanborough Gravel Pit			Green tickY			Witney	GCR	Template:Nature on the map	Citation
Lye Valley	Lye Valley	Green tickY			YES	Oxford	LNR	Template:Nature on the map	Citation	This a calcareous valley fen, which is a nationally rare and threatened habitat. It is drained by the Lye Brook. There is a variety of moss species, such as Drepanocladus revolvens and Campylium stellatum. Invertebrates include the nationally rare soldier fly, Vanoyia tenuicornis and the uncommon spiders, Xysticus ulmi and Anistea elegans.
Lyehill Quarry	Lyehill Quarry		Green tickY		NO	Oxford	GCR	Template:Nature on the map	Citation	This disused quarry exposes rocks dating to the Wheatley Limestone member of the Stanford Formation, approximately 160 million years ago during the Middle Jurassic. The deposits are limestones in an unstable reef substrate, and the only fossils are of oysters.
Magdalen Grove			Green tickY			Oxford	GCR	Template:Nature on the map	Citation
Magdalen Quarry			Green tickY			Oxford	GCR, LNR	Template:Nature on the map	Citation
Middle Barton Fen		Green tickY				Chipping Norton		Template:Nature on the map	Citation
Moulsford Downs	Moulsford Down	Green tickY			NO	Moulsford		Template:Nature on the map	Citation	This chalk grassland site on the Berkshire Downs has a rich wildlife. The diverse invertebrate fauna includes the uncommon robber-fly Leptarthrus brevirostris, the adonis blue butterfly, the juniper shield bug, the weevils Baris picicornis and seed beetle Phyllobius viridicollis, the leaf beetle Phyllotreta nodicornis and the Bruchus cisti.
Murcott Meadows		Green tickY				Oxford	BBOWT	Template:Nature on the map	Citation
Neithrop Fields Cutting	Neithrop Fields Cutting		Green tickY		YES	Banbury	GCR	Template:Nature on the map	Citation	This site exhibits sections dating to the Early Jurassic around 190 to 180 million years ago. Its Middle Lias sediments show that it was adjacent to the "London landmass", which was then an island. The Upper Lias have a section rich in fossil ammonites. Natural England describes the site as a "key palaeogeographic and stratigraphic locality".
New Marston Meadows	New Marston Meadows	Green tickY			PP	Oxford		Template:Nature on the map	Citation	These meadows in the floodplain of the River Cherwell are traditionally managed for hay or by grazing. Some plants are typical of those on ancient meadows, such as common meadow-rue, pepper-saxifrage, devil's-bit scabious, adder's-tongue fern, smooth brome and meadow barley. Snake's head fritillary, which is nationally scarce, is also found at the site.
Otmoor	Otmoor	Green tickY			PP	Murcott		Template:Nature on the map	Citation	This site in the floodplain of the River Ray has herb-rich damp grassland, wet sedge, coarse grassland, woodland, pools and ditches. More than sixty species of bird breed on the site, such as curlew and lapwing, while wintering birds include teal, wigeon, snipe, golden plover and short-eared owl.
Out Wood	Out Wood	Green tickY			PP	Woodstock		Template:Nature on the map	Citation	This semi-natural wood is a surviving fragment of the medieval Royal Forest of Wychwood. It is overgrown coppice with standards, and the standards are oaks between 30 and 150 years old. Rides have a diverse ground flora, including meadow saffron, broad-leaved helleborine and greater butterfly orchid.
Pishill Woods	Pishill Woods	Green tickY			PP	Henley-on-Thames		Template:Nature on the map	Citation	These semi-natural woods have a rich ground flora, including 35 species associated with ancient woodland. The southern part is dominated by beech and oak coppice, whereas the north, which has been managed as high forest, has mainly mature beech trees, with smaller numbers of oak, ash, cherry, whitebeam, yew and wych elm. The southern part is common land.
Pixey and Yarnton Meads	Pixey and Yarnton Meads	Green tickY			PP	Oxford	NCR, SAC	Template:Nature on the map	Citation	These are unimproved flood meadows on the bank of the River Thames. Their management is very well recorded, and it is known that they have been grazed and cut for hay for more than a thousand years, with the result that they are botanically rich, with more than 150 species. The site has been the subject of detailed botanical and hydrological research.
Port Meadow with Wolvercote Common and Green	Port Meadow	Green tickY			PP	Oxford	NCR, SAC, SM	Template:Nature on the map	Citation	This site consists of meadows in the floodplain of the River Thames. It is thought to have been grazed for over a thousand years and is a classic site for studying the effects of grazing on flora. There is a low diversity compared with neighbouring fields which are cut for hay, but 178 flowering plants have been recorded, including creeping marshwort, which is a Red Data Book species not found anywhere else in Britain.
Priest's Hill			Green tickY			Henley-on-Thames	GCR	Template:Nature on the map	Citation
Reed Hill	Reed Hill	Green tickY			NO	Witney		Template:Nature on the map	Citation	This sheltered dry valley has unimproved limestone grassland, secondary woodland and scrub. A spring at the northern end makes the ground there seasonally damp. Invertebrates include the small blue, Duke of Burgundy and dark green fritillary butterflies, the small shield bug Neotti-glossa pusilla, the beetle Oedemera lurida and the spider Hypsosinga pygmaea.
Rock Edge	Rock Edge		Green tickY		YES	Oxford	GCR, LNR	Template:Nature on the map	Citation	This site exposes limestone rich in coral called Coral rag, laid down when the area was under a warm, shallow sea, similar to the Bahama Banks today. It is rich in fossils derived from the coral reefs. It dates to the Upper Jurassic, around 145 million years ago.
Rushy Meadows	Rushy Meadows	Green tickY			NO	Kidlington		Template:Nature on the map	Citation	This site consists of unimproved alluvial grasslands on the bank of the Oxford Canal. The species-rich sward is dominated by hard rush, and other plants include water avens, which is very uncommon in the Thames Basin, pepper saxifrage, devil's bit scabious, early marsh orchid and distant sedge.
Salt Way, Ditchley	Salt Way, Ditchley	Green tickY			YES	Chipping Norton	LNR	Template:Nature on the map	Citation	This is a stretch of an ancient track together with its species-rich grass verges and hedges. It has been designated an SSSI because it has the largest known British colony of the very rare downy woundwort, with more than 100 seedlings and 60 flowering stems. The plant is associated with hedges along Roman roads and ancient tracks on calcareous soils, and Salt Way may date to the Roman period.
Sarsgrove Wood	Sarsgrove Wood	Green tickY			NO	Chipping Norton		Template:Nature on the map	Citation	This ancient wood has a diverse geology resulting in a variety of soil conditions. A stream with poorly drained valley walls runs through the wood. More freely-drained areas have ground flora including early-purple orchid, primrose, bluebell, early dog-violet, sweet violet and narrow-leaved everlasting pea.
Sharp's Hill Quarry	Sharp's Hill Quarry		Green tickY		NO	Banbury	GCR	Template:Nature on the map	Citation	This is the type locality of the Sharp's Hill Formation. It is very fossiliferous and dates to the Bathonian stage of the Middle Jurassic, around 167 million years ago. It is very important for understanding the Bathonian succession in north Oxfordshire. Strata of the underlying Chipping Norton Formation are also present.
Sheep's Banks	Sheep's Bank	Green tickY			NO	Woodstock		Template:Nature on the map	Citation	This steeply sloping site is species-rich grassland which is traditionally managed. An ancient hedge runs the length of the site and a small stream runs along the downward side. Flora include five species of orchid, including bee, pyramidal and green-winged.
Shellingford Crossroads Quarry	Shellingford Crossroads Quarry		Green tickY		YES	Faringdon	GCR	Template:Nature on the map	Citation	This site exposes rocks of the Corallian Group, dating to the Oxfordian stage of the Late Jurassic, around 160 million years ago. It has many fossils of corals and reef-dwelling bivalves, and it is also important as it provides an example of the complexity of Oxfordian stratigraphy.
Shipton-on-Cherwell and Whitehill Farm Quarries	Shipton-on-Cherwell and Whitehill Farm Quarries		Green tickY		NO	Kidlington	GCR	Template:Nature on the map	Citation	This site exposes a lithostratigraphic succession dating to the Bathonian stage of the Middle Jurassic, around 167 million years ago. Shipton-on-Cherwell Quarry is described by Natural England as "of international importance as one of the best Upper Bathonian reptile sites known", and it has yielded type material for two species of crocodile. The quarry has also produced the type specimen of the dinosaur Dacentrurus vetustus.
Shirburn Hill	Shirburn Hill	Green tickY			YES	Watlington		Template:Nature on the map	Citation	The hill has chalk grassland, chalk heath, scrub and broadleaved woodland. Most grasslands in the Chilterns are maintained by stock, and the site is unusual in being cropped only by rabbits. Less closely grazed areas have taller grass with species such as false oat-grass, tor-grass and red fescue. There are large areas of hawthorn and buckthorn scrub.
Sidling's Copse and College Pond		Green tickY				Oxford	BBOWT	Template:Nature on the map	Citation
Spartum Fen		Green tickY				Oxford		Template:Nature on the map	Citation
Stanton Great Wood	Stanton Great Wood	Green tickY			NO	Oxford		Template:Nature on the map	Citation	This coppice with standards wood is traditionally managed. The dominant trees are pedunculate oak, ash and hazel, and there is a rich flora and diverse insects. Moths include the buff footman, poplar lutestring, blotched emerald, maiden's blush and the nationally uncommon small black arches.
Stanton Harcourt			Green tickY			Witney	GCR	Template:Nature on the map	Citation
Stonesfield Common, Bottoms and Banks	Stonesfield Common, Bottoms and Banks	Green tickY			PP	Witney		Template:Nature on the map	Citation	This site is composed of steeply sloping valleys and banks. Most of it is unimproved limestone grassland and scrub, but there is also an area of semi-natural ancient woodland. The grass in Stonesfield Common is mainly upright brome, and herbs include field scabious, greater knapweed, lady's bedstraw and pyramidal orchid.
Stonesfield Slate Mines			Green tickY			Witney	GCR	Template:Nature on the map	Citation
Stratton Audley Quarries			Green tickY			Bicester	GCR	Template:Nature on the map	Citation
Sturt Copse	Sturt Copse	Green tickY			FP	Witney		Template:Nature on the map	Citation	This wood has many giant stools of coppiced of ash and wych elm trees, together with oaks, some of them pollarded. Most of the ground layer is dominated by dog's mercury, and there are uncommon plants such as yellow star-of-Bethlehem, Lathraea squamaria and hard shield-fern.
Sugworth	Sugworth		Green tickY		NO	Abingdon	GCR	Template:Nature on the map	Citation	This site dates to the Cromerian Stage, an interglacial over half a million years ago. It is a river channel cut into Kimmeridge Clay of the Late Jurassic, and it has rich deposits of vertebrates, ostracods, molluscs, beetles, plant remains and pollen.
Swyncombe Downs	Swyncombe Downs	Green tickY			PP	Henley-on-Thames	SM	Template:Nature on the map	Citation	This is an area of chalk grassland and scrub on the steep slopes of the Chiltern Hills. The site is described by Natural England as outstanding for its butterflies and moths. Butterflies include the silver-spotted skipper, which is nationally rare, grizzled skipper, grizzled skipper and dark green fritillary. There are day flying moths such as the cistus forester, chimney sweeper and wood tiger.
Taynton Quarries		Green tickY				Taynton		Template:Nature on the map	Citation
Tuckmill Meadows		Green tickY				Shrivenham	LNR	Template:Nature on the map	Citation
Warren Bank	Warren Bank	Green tickY			YES	Wallingford	BBOWT	Template:Nature on the map	Citation	This steeply sloping site has unimproved chalk grassland and scrub. There is a rich variety of flora, including horseshoe vetch, chalk milkwort and bee orchid. There are also many insects, with butterflies such as dark green fritillary and green hairstreak.
Waterperry Wood	Waterperry Wood	Green tickY			YES	Forest Hill	NCR	Template:Nature on the map	Citation	This wood has been designated an SSSI because it contains a diverse and important insect fauna, with many nationally uncommon and rare species. There are nineteen species of nationally uncommon hoverflies, including five which are listed in the British Red Data Book of Insects, many nationally uncommon beetles, thirty butterfly species and several rare moths.
Watlington and Pyrton Hills	Watlington Hill	Green tickY			PP	Watlington	LNR	Template:Nature on the map	Citation	This site has floristically diverse chalk grassland, chalk scrub, broadleaved woodland and yew woodland. Watlington Hill has short turf which is grazed by rabbits, with flowering plants including yellow-wort, dropwort, horseshoe vetch, squinancywort and the nationally rare candytuft.
Wendlebury Meads and Mansmoor Closes	Wendlebury Meads	Green tickY			FP	Kidlington	BBOWT, NCR	Template:Nature on the map	Citation	Wendlebury Meads consists of several meadows which have been traditionally managed, and have complex and varied flora. It is one of the few Calcareous pastures to have survived agricultural improvements. Almost all show evidence of medieval ridge and furrow ploughing. Mansmoor Closes were enclosed before 1622, and are important from both a landscape and archaeological point of view. More than 160 plant species have been recorded on the site.
Weston Fen	Weston Fen	Green tickY			FP	Bicester		Template:Nature on the map	Citation	This site has diverse habitats, including a fast-flowing stream, species-rich, calcareous fen, willow carr, hazel woodland, limestone grassland and marshy grassland. There are several rare species of beetle, such as Sphaerius acaroides, Eubria palustris, Silis ruficollis and Agabus biguttatus.
Westwell Gorse		Green tickY				Burford		Template:Nature on the map	Citation
Whitecross Green and Oriel Woods	Whitecross Green	Green tickY			YES	Murcott	BBOWT	Template:Nature on the map	Citation	These ancient woods are part of two former royal forests, Shotover and Bernwood. They are crossed by herb-rich and grassy rides, some of which are bordered by ditches, and there is also a pond and a marsh. Twenty-four species of butterfly have been recorded including the nationally rare black hairstreak.
Whitehill Wood		Green tickY				Witney		Template:Nature on the map	Citation
Whitehorse Hill	Whitehorse Hill	Green tickY	Green tickY		PP	Faringdon	GCR, SM	Template:Nature on the map	Citation	This dry valley provides evidence of solifluction (slow sloping downhill due to repeated freezing and thawing) during at least one cold stage of the Pleistocene. The site has unimproved chalk grassland with a rich variety of flora, particularly in former chalk quarries. Grasses include upright brome and sheep’s fescue.
Wicklesham and Coxwell Pits			Green tickY			Faringdon	GCR	Template:Nature on the map	Citation
Wolvercote Meadows	Wolvercote Meadows	Green tickY			PP	Oxford	SAC	Template:Nature on the map	Citation	These meadows next to the River Thames are traditionally managed for pasture and hay, and they have a rich flora. The largest, which is called Great Baynham's Meadow, is used as pasture, and the other fields are managed for hay with grazing in the autumn. There are also watercourses which have many dragonflies.
Woodeaton Quarry	Woodeaton Quarry		Green tickY		YES	Oxford	GCR	Template:Nature on the map	Citation	This site exposes a sequence of rocks dating to the Middle Jurassic around 167 million years ago. It exhibits one of the most complete Bathonian sections in the county, and is described by Natural England as "of great palaeontological and sedimentological interest".
Woodeaton Wood	Woodeaton Wood	Green tickY			NO	Oxford		Template:Nature on the map	Citation	This coppice with standards on calcareous soil is a fragment of the ancient Shotover Forest. The ground layer has plants such as wood anemone, nettle-leaved bellflower, ramsons, goldilocks buttercup, early dog-violet and enchanter's nightshade.
Wormsley Chalk Banks	Wormsley Chalk Banks	Green tickY			PP	Stokenchurch		Template:Nature on the mapTemplate:Efn	Citation	The site has chalk grassland which is rich in both plant and invertebrate species which have sharply declined nationally. Flowers include bee and fly orchids, the latter of which is becoming scarce. Invertebrates include a variety of butterflies, harvest spiders and slowworms.
Worsham Lane		Green tickY				Witney		Template:Nature on the map	Citation
Wychwood	Wychwood	Green tickY			PP	Witney	NCR, NNR, SM	Template:Nature on the map	Citation	This remnant of a large royal hunting forest is the largest area of ancient broadleaved forest in the county, and the site also has limestone grassland and four marl lakes. More than 360 species of flowering plants and ferns have been recorded, together with 85 lichens and 60 mosses and liverworts. The invertebrate fauna is diverse, including 17 rare flies.
Wytham Ditches and Flushes	Wytham Ditches and Flushes	Green tickY			NO	Wytham		Template:Nature on the map	Citation	These ditches have a rich aquatic and fen flora. Uncommon wetland plants include greater water-parsnip, greater spearwort, water violet, brookweed, narrow-leaved water plantain and creeping jenny. There is also a small tussocky field which is kept partly waterlogged by flushes.
Wytham Woods	Wytham Wood	Green tickY			YES	Wytham	NCR	Template:Nature on the map	Citation	Habitats in this site, which formerly belonged to Abingdon Abbey, include ancient woodland and limestone grassland. Over 500 species of vascular plant have been recorded, and more data about the bird, mammal and invertebrate fauna, have probably been recorded about this site than any other in the country as a result of studies by Oxford University. More than 900 species of beetles, 580 of flies, 200 of spiders, 700 of bees, wasps and ant, 250 of true bugs and 27 of earthworms have been recorded.

See also

• Berkshire, Buckinghamshire and Oxfordshire Wildlife Trust
• List of local nature reserves in Oxfordshire