Park End Wood is a Site of Special Scientific Interest

Site of Special Scientific Interest

A Site of Special Scientific Interest is a conservation designation denoting a protected area in the United Kingdom. SSSIs are the basic building block of site-based nature conservation legislation and most other legal nature/geological conservation designations in Great Britain are based upon...

 in the Teesdale

Teesdale (district)

Teesdale was, from 1974 to 2009, a local government district in County Durham, England. Its council was based in Barnard Castle and it was named after the valley of the River Tees....

 district of west County Durham

County Durham

County Durham is a ceremonial county and unitary district in north east England. The county town is Durham. The largest settlement in the ceremonial county is the town of Darlington...

, England

England

England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...

. The site occupies a low hill of Whin Sill

Whin Sill

The Whin Sill or Great Whin Sill is a tabular layer of the igneous rock dolerite in County Durham and Northumberland in the northeast of England. It lies partly in the North Pennines Area of Outstanding Natural Beauty and partly in Northumberland National Park and stretches from Teesdale northwards...

 on the southern edge of the River Tees

River Tees

The River Tees is in Northern England. It rises on the eastern slope of Cross Fell in the North Pennines, and flows eastwards for 85 miles to reach the North Sea between Hartlepool and Redcar.-Geography:...

 floodplain

Floodplain

A floodplain, or flood plain, is a flat or nearly flat land adjacent a stream or river that stretches from the banks of its channel to the base of the enclosing valley walls and experiences flooding during periods of high discharge...

 just over 2 km upstream from the village of Middleton-in-Teesdale

Middleton-in-Teesdale

Middleton-in-Teesdale is a small market town in County Durham, in England. It is situated on the north side of Teesdale between Eggleston and Newbiggin, a few miles to the north west of Barnard Castle...

. It adjoins the Upper Teesdale

Upper Teesdale

Upper Teesdale is a Site of Special Scientific Interest in the Teesdale district of west County Durham, England. It encompasses an extensive upland area that includes the headwaters of the River Tees and the surrounding catchment area upstream of the village of Langdon Beck.The site has a diverse...

 SSSI to the south, and the Middle Crossthwaite

Middle Crossthwaite

Middle Crossthwaite is a Site of Special Scientific Interest in the Teesdale district of County Durham, England. It is situated on the south bank of the River Tees, about 1.5 km upstream from the village of Middleton-in-Teesdale...

 and Stonygill Meadows

Middle Side and Stonygill Meadows

Middle Side and Stonygill Meadows is a Site of Special Scientific Interest in the Teesdale district of County Durham, England. It consists of two separate areas, one to the north of the River Tees, the other on the south bank, about 2 km upstream from the village of Middleton-in-Teesdale...

 SSSIs are nearby.

The hill slopes are wooded with downy birch, Betula pubescens, mixed with ash, Fraxinus excelsior, and rowan, Sorbus aucuparia

Sorbus aucuparia

Sorbus aucuparia , is a species of the genus Sorbus, native to most of Europe except for the far south, and northern Asia...

, with an understorey of hazel, Corylus avellana

Corylus avellana

Corylus avellana, the Common Hazel, is a species of hazel native to Europe and western Asia, from the British Isles south to Iberia, Greece, Turkey and Cyprus, north to central Scandinavia, and east to the central Ural Mountains, the Caucasus, and northwestern Iran. It is an important component of...

, a species not usually associated with birch.

On the heavily-grazed hill top is an acid grassland vegetation, in which Yorkshire fog, Holcus lanatus, common bent, Agrostis capillaris

Agrostis capillaris

Agrostis capillaris is a rhizomatous and stoloniferous perennial in the grass family . It is native to Eurasia and has been widely introduced in many parts of the world...

, and red fescue, Festuca rubra

Festuca rubra

Festuca rubra is a species of grass known by the common name red fescue. It is found worldwide and can tolerate many habitats and climates; it generally needs full sun to thrive...

, are the predominant grasses.