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Aire Gap is a pass through the
Pennines The Pennines (), also known as the Pennine Chain or Pennine Hills, are a range of uplands running between three regions of Northern England: North West England on the west, North East England and Yorkshire and the Humber on the east. Common ...
in
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 ...
formed by geologic faults and carved out by glaciers. The term is used to describe a geological division, a travel route, or a location that is an entry into the Aire river valley.


Geology

Geologically the Aire Gap lies between the Craven Fault and the
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 w ...
uplands of the
Yorkshire Dales The Yorkshire Dales is an upland area of the Pennines in the historic county of Yorkshire, England, most of it in the Yorkshire Dales National Park created in 1954. The Dales comprise river valleys and the hills rising from the Vale of York w ...
to the north and the
Forest of Bowland The Forest of Bowland, also known as the Bowland Fells and formerly the Chase of Bowland, is an area of gritstone fells, deep valleys and peat moorland, mostly in north-east Lancashire, England, with a small part in North Yorkshire (howe ...
and the millstone grit moors of the
South Pennines The South Pennines is a region of moorland and hill country in northern England lying towards the southern end of the Pennines. In the west it includes the Rossendale Valley and the West Pennine Moors. It is bounded by the Greater Manchester ...
. The South Pennines is the system between the Aire Gap and the
Peak District The Peak District is an Highland, upland area in England at the southern end of the Pennines. Mostly in Derbyshire, it extends into Cheshire, Greater Manchester, Staffordshire, West Yorkshire and South Yorkshire. It includes the Dark Peak, whe ...
.Encyclopædia Britannica The gap was formed by the dropping of the Craven Faults in the
Carboniferous The Carboniferous ( ) is a geologic period and system of the Paleozoic that spans 60 million years from the end of the Devonian Period million years ago ( Mya), to the beginning of the Permian Period, million years ago. The name ''Carboniferou ...
through
Jurassic The Jurassic ( ) is a geologic period and stratigraphic system that spanned from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period, approximately Mya. The Jurassic constitutes the middle period of ...
periods combined with glacial scouring by ice sheets in the
Pleistocene The Pleistocene ( , often referred to as the ''Ice age'') is the geological Epoch (geology), epoch that lasted from about 2,580,000 to 11,700 years ago, spanning the Earth's most recent period of repeated glaciations. Before a change was fina ...
Ice Age. The Aire Gap splits the Pennines into north and south by allying with the River Ribble. The Pennine chain is divided into two sections by the Aire Gap formed by the River Aire flowing south, a member of the Humber basin, and the Ribble flowing west and entering the Irish sea.


Geography

The term Aire Gap is used in both Ribblesdale and Pendle to denote a hypsograph (watershed) between those rivers and Airedale. Two locations are so described: * Ribblesdale's Aire Gap designates a precise point at Google Earth just east of Hellifield near
Settle Settle or SETTLE may refer to: Places * Settle, Kentucky, United States * Settle, North Yorkshire, a town in England ** Settle Rural District, a historical administrative district Music * Settle (band), an indie rock band from Pennsylvania * ''S ...
at , and is labelled Aire Gap on some maps.Enter "Aire Gap, United Kingdom" o
Bing Maps
/ref> It is the watershed of that pass and lies between the "Little" North Western Railway and the
A65 road A65 or A-65 may refer to: * A65 road (England), a major road in England * A65 motorway (France), a major road in France * A65 motorway (Germany), a road connecting Kandel and Wörth am Rhein * A65 motorway (Netherlands) * A65 motorway (Spain) * Ben ...
. * The head of Pendle Water valley culminates in Foulridge near
Colne Colne () is a market town and civil parish in the Borough of Pendle in Lancashire, England. Located northeast of Nelson, north-east of Burnley, east of Preston and west of Leeds. The town should not be confused with the unrelated Colne ...
. In literature Colne commonly describes itself as being in the Aire Gap. When the
Leeds and Liverpool Canal The Leeds and Liverpool Canal is a canal in Northern England, linking the cities of Leeds and Liverpool. Over a distance of , crossing the Pennines, and including 91 locks on the main line. The Leeds and Liverpool Canal has several small branc ...
was being constructed they dug a tunnel at altitude beneath Foulridge's to make a route even lower than the 160m pass near Hellifield.


Transport route

The Pennines form a natural barrier to east–west communications, but the Tyne Gap links Carlisle and Newcastle and the Aire Gap links Lancashire and Yorkshire. Its extent is vague, a 19th-century author wrote: The Aire Gap is of considerable strategic importance and historically
Skipton Castle Skipton Castle is a Grade I Listed medieval castle in Skipton, North Yorkshire, England. It was built in 1090 by Robert de Romille, a Norman baron, and has been preserved for over 931 years. History The castle was originally a motte and ...
controlled the area.
Skipton Skipton (also known as Skipton-in-Craven) is a market town and civil parish in the Craven district of North Yorkshire, England. Historically in the East Division of Staincliffe Wapentake in the West Riding of Yorkshire, it is on the Riv ...
is now considered more central to the Aire Gap than terminal.


Topography

The treeless
moorland Moorland or moor is a type of habitat found in upland areas in temperate grasslands, savannas, and shrublands and montane grasslands and shrublands biomes, characterised by low-growing vegetation on acidic soils. Moorland, nowadays, generall ...
gives no shelter and modern Pennine transport can find it a formidable barrier when roads are blocked by snow for several days. The Aire Gap route is a sheltered passageway, and inhabited along its length. The Aire Gap was of
topographic Topography is the study of the forms and features of land surfaces. The topography of an area may refer to the land forms and features themselves, or a description or depiction in maps. Topography is a field of geoscience and planetary scie ...
significance for the historic North of England providing a low-altitude
pass Pass, PASS, The Pass or Passed may refer to: Places *Pass, County Meath, a townland in Ireland * Pass, Poland, a village in Poland * Pass, an alternate term for a number of straits: see List of straits *Mountain pass, a lower place in a mounta ...
through "the backbone of England". It was the Pennine transport corridor from
Cumbria Cumbria ( ) is a ceremonial and non-metropolitan county in North West England, bordering Scotland. The county and Cumbria County Council, its local government, came into existence in 1974 after the passage of the Local Government Act 1972. ...
and Strathclyde to the Vale of York.
Neolithic The Neolithic period, or New Stone Age, is an Old World archaeological period and the final division of the Stone Age. It saw the Neolithic Revolution, a wide-ranging set of developments that appear to have arisen independently in several pa ...
long-distance trade is proved by many finds of stone axes from central Cumbria. To the north stand
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 w ...
hills of up to
above mean sea level Height above mean sea level is a measure of the vertical distance ( height, elevation or altitude) of a location in reference to a historic mean sea level taken as a vertical datum. In geodesy, it is formalized as '' orthometric heights''. Th ...
and to its south lie bleak
sandstone Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains. Sandstones comprise about 20–25% of all sedimentary rocks. Most sandstone is composed of quartz or feldspar (both silicat ...
moors, that above grow little but bracken.page 4
an
page 5
Marginal Upland Grazing Sutton Moor, Domesday Reloaded, BBC 1986
The builders of the "Little" North Western Railway sought the lowest course through the Aire Gap and found that to be near
Giggleswick Giggleswick, a village and civil parish in the Craven district of North Yorkshire, England, lies on the B6480 road, less than north-west of the town of Settle and divided from it by the River Ribble. It is the site of Giggleswick School ...
scar at , and just east of Hellifield at a point labelled Aire Gap on maps. There is a lower pass from Airedale to Ribblesdale near Thornton-in-Craven of at that was used by the Romans who built a road. The nearest alternative pass is Stainmore Gap (Eden-Tees)Shop for OS Maps, Create & Share Routes with getamap , Ordnance Survey Leisure
Ordnance Survey Explorer Map, OL41, Forest of Bowland and Ribblesdale
to the north that climbs to and its climate is classed as sub-arctic in places.


References

{{Reflist Yorkshire Dales Geology of the Pennines Geology of North Yorkshire