The Central Lowlands, sometimes called the Midland Valley or Central Valley, is a geologically defined area of relatively low-lying land in southern
Scotland
Scotland (, ) is a Countries of the United Kingdom, country that is part of the United Kingdom. Covering the northern third of the island of Great Britain, mainland Scotland has a Anglo-Scottish border, border with England to the southeast ...
. It consists of a
rift valley
A rift valley is a linear shaped lowland between several highlands or mountain ranges created by the action of a geologic rift. Rifts are formed as a result of the pulling apart of the lithosphere due to extensional tectonics. The linear d ...
between the
Highland Boundary Fault
The Highland Boundary Fault is a major fault zone that traverses Scotland from Arran and Helensburgh on the west coast to Stonehaven in the east. It separates two different geological terranes which give rise to two distinct physiographic terr ...
to the north and the
Southern Uplands Fault
The Southern Uplands Fault (or occasionally Southern Upland Fault) is a fault in Scotland that runs from Girvan (or more specifically from the Rhins of Galloway) to Dunbar on the East coast. It marks the southern boundary of the Scottish Midland ...
to the south. The Central Lowlands are one of the three main geographical sub-divisions of Scotland, the other two being the
Highlands and Islands
The Highlands and Islands is an area of Scotland broadly covering the Scottish Highlands, plus Orkney, Shetland and Outer Hebrides (Western Isles).
The Highlands and Islands are sometimes defined as the area to which the Crofters' Act of 18 ...
which lie to the north, northwest and the
Southern Uplands
The Southern Uplands ( gd, Na Monaidhean a Deas) are the southernmost and least populous of mainland Scotland's three major geographic areas (the other two being the Central Lowlands and the Grampian Mountains and the Highlands, as illustrate ...
, which lie south of the associated second fault line. It is the most populated of
Scotland
Scotland (, ) is a Countries of the United Kingdom, country that is part of the United Kingdom. Covering the northern third of the island of Great Britain, mainland Scotland has a Anglo-Scottish border, border with England to the southeast ...
’s three geographical regions.
Geology and geomorphology
The Central Lowlands is largely underlain by
Paleozoic
The Paleozoic (or Palaeozoic) Era is the earliest of three geologic eras of the Phanerozoic Eon.
The name ''Paleozoic'' ( ;) was coined by the British geologist Adam Sedgwick in 1838
by combining the Greek words ''palaiós'' (, "old") and ' ...
formations. Many of these
sedimentary rock
Sedimentary rocks are types of rock that are formed by the accumulation or deposition of mineral or organic particles at Earth's surface, followed by cementation. Sedimentation is the collective name for processes that cause these particles ...
s have economic significance for it is here that the
coal
Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. Coal is mostly carbon with variable amounts of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen.
Coal is formed when ...
and
iron bearing rocks that fueled
Scotland
Scotland (, ) is a Countries of the United Kingdom, country that is part of the United Kingdom. Covering the northern third of the island of Great Britain, mainland Scotland has a Anglo-Scottish border, border with England to the southeast ...
's
industrial revolution
The Industrial Revolution was the transition to new manufacturing processes in Great Britain, continental Europe, and the United States, that occurred during the period from around 1760 to about 1820–1840. This transition included going f ...
are to be found. This area has also experienced intense
volcanism
Volcanism, vulcanism or volcanicity is the phenomenon of eruption of molten rock (magma) onto the surface of the Earth or a solid-surface planet or moon, where lava, pyroclastics, and volcanic gases erupt through a break in the surface called a ...
,
Arthur's Seat
Arthur's Seat ( gd, Suidhe Artair, ) is an ancient volcano which is the main peak of the group of hills in Edinburgh, Scotland, which form most of Holyrood Park, described by Robert Louis Stevenson as "a hill for magnitude, a mountain in virtu ...
in
Edinburgh
Edinburgh ( ; gd, Dùn Èideann ) is the capital city of Scotland and one of its 32 council areas. Historically part of the county of Midlothian (interchangeably Edinburghshire before 1921), it is located in Lothian on the southern shore of t ...
being the remnant of a once much larger
volcano
A volcano is a rupture in the Crust (geology), crust of a Planet#Planetary-mass objects, planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and volcanic gas, gases to escape from a magma chamber below the surface.
On Ear ...
active in the
Carboniferous period some 300 million years ago. This area is relatively low-lying, although even here hills such as the
Ochils and
Campsie Fells
The Campsie Fells (also known as the Campsies; Scottish Gaelic: ''Monadh Chamaisidh'') are a range of hills in central Scotland, stretching east to west from Denny Muir to Dumgoyne in Stirlingshire and overlooking Strathkelvin to the south. Th ...
are rarely far from view. In common with the rest of Scotland the whole region was affected by
Pleistocene
The Pleistocene ( , often referred to as the ''Ice age'') is the geological 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 finally confirmed in ...
glaciation
A glacial period (alternatively glacial or glaciation) is an interval of time (thousands of years) within an ice age that is marked by colder temperatures and glacier advances. Interglacials, on the other hand, are periods of warmer climate be ...
s.
Boundary faults
The
Highland Boundary Fault
The Highland Boundary Fault is a major fault zone that traverses Scotland from Arran and Helensburgh on the west coast to Stonehaven in the east. It separates two different geological terranes which give rise to two distinct physiographic terr ...
runs from North Glen Sannox on the
Isle of Arran in the south and west through the
Isle of Bute
The Isle of Bute ( sco, Buit; gd, Eilean Bhòid or '), known as Bute (), is an island in the Firth of Clyde in Scotland, United Kingdom. It is divided into highland and lowland areas by the Highland Boundary Fault.
Formerly a constituent is ...
and
Helensburgh
Helensburgh (; gd, Baile Eilidh) is an affluent coastal town on the north side of the Firth of Clyde in Scotland, situated at the mouth of the Gareloch. Historically in Dunbartonshire, it became part of Argyll and Bute following local gove ...
, then forms the northern boundary of
Strathmore before reaching
Stonehaven
Stonehaven ( , ) is a town in Scotland. It lies on Scotland's northeast coast and had a population of 11,602 at the 2011 Census.
After the demise of the town of Kincardine, which was gradually abandoned after the destruction of its royal cast ...
in the north east. The
fault was active during the
Caledonian orogeny
The Caledonian orogeny was a mountain-building era recorded in the northern parts of the British Isles, the Scandinavian Mountains, Svalbard, eastern Greenland and parts of north-central Europe. The Caledonian orogeny encompasses events that ...
, a
plate tectonic collision which took place from Mid
Ordovician
The Ordovician ( ) is a geologic period and system, the second of six periods of the Paleozoic Era. The Ordovician spans 41.6 million years from the end of the Cambrian Period million years ago (Mya) to the start of the Silurian Period Mya.
T ...
to Mid
Devonian periods (520 to 400 million years ago), during the closure of the
Iapetus Ocean. The fault allowed the Midland Valley to descend as a major
rift
In geology, a rift is a linear zone where the lithosphere is being pulled apart and is an example of extensional tectonics.
Typical rift features are a central linear downfaulted depression, called a graben, or more commonly a half-grabe ...
by as much as 4000 metres and there was subsequently
vertical movement. This earlier vertical movement was later replaced by a horizontal shear.
The
Southern Uplands Fault
The Southern Uplands Fault (or occasionally Southern Upland Fault) is a fault in Scotland that runs from Girvan (or more specifically from the Rhins of Galloway) to Dunbar on the East coast. It marks the southern boundary of the Scottish Midland ...
runs from the
Rhins of Galloway
The Rhins of Galloway, otherwise known as the Rhins of Wigtownshire (or as The Rhins, also spelt The Rhinns; gd, Na Rannaibh), is a hammer-head peninsula in Dumfries and Galloway, Scotland. Stretching more than from north to south, its southern ...
in the west towards
Dunbar
Dunbar () is a town on the North Sea coast in East Lothian in the south-east of Scotland, approximately east of Edinburgh and from the English border north of Berwick-upon-Tweed.
Dunbar is a former royal burgh, and gave its name to an ecc ...
on the east coast from
Edinburgh
Edinburgh ( ; gd, Dùn Èideann ) is the capital city of Scotland and one of its 32 council areas. Historically part of the county of Midlothian (interchangeably Edinburghshire before 1921), it is located in Lothian on the southern shore of t ...
.
"Regional Geology, Southern Uplands - Map"
Scottishgeology.com. Retrieved 21 March 2008.
Human geography
A productive combination of fertile low-lying agricultural land and significant deposits of economically valuable coal and iron have led to the Central Lowlands being much more densely populated than the rest of Scotland. The major cities of Glasgow
Glasgow ( ; sco, Glesca or ; gd, Glaschu ) is the most populous city in Scotland and the fourth-most populous city in the United Kingdom, as well as being the 27th largest city by population in Europe. In 2020, it had an estimated popul ...
, Edinburgh
Edinburgh ( ; gd, Dùn Èideann ) is the capital city of Scotland and one of its 32 council areas. Historically part of the county of Midlothian (interchangeably Edinburghshire before 1921), it is located in Lothian on the southern shore of t ...
, Stirling
Stirling (; sco, Stirlin; gd, Sruighlea ) is a city in central Scotland, northeast of Glasgow and north-west of Edinburgh. The market town, surrounded by rich farmland, grew up connecting the royal citadel, the medieval old town with its me ...
, Perth
Perth is the capital and largest city of the Australian state of Western Australia. It is the fourth most populous city in Australia and Oceania, with a population of 2.1 million (80% of the state) living in Greater Perth in 2020. Perth i ...
and Dundee all lie in the Central Lowlands, and over half of Scotland's population lives in this region.
See also
* Central Scotland (disambiguation)
* Geology of Scotland
The geology of Scotland is unusually varied for a country of its size, with a large number of differing geological features.Keay & Keay (1994) page 415. There are three main geographical sub-divisions: the Highlands and Islands is a diverse area w ...
* Scottish Lowlands
References
* Gillen, Con (2003) ''Geology and landscapes of Scotland''. Harpenden. Terra Publishing.
* Keay, J. & Keay, J. (1994) ''Collins Encyclopaedia of Scotland''. London. HarperCollins.
* McKirdy, Alan Gordon, John & Crofts, Roger (2007) ''Land of Mountain and Flood: The Geology and Landforms of Scotland''. Edinburgh. Birlinn.
{{Portal bar, Scotland
Aulacogens
Carboniferous Scotland
Carboniferous volcanism
Depressions of Europe
Geology of Scotland
Highland Boundary Fault
Regions of Scotland
Rifts and grabens