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 country that is part of the United Kingdom. Covering the northern third of the island of Great Britain, mainland Scotland has a border with England to the southeast and is otherwise surrounded by the Atlantic Ocean to th ...

. 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 de ...

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 ter ...

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 1886 ...

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

’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 particle ...

s have economic significance for it is here that the

coal Coal is a combustible black or brownish-black sedimentary rock, formed as stratum, rock strata called coal seams. Coal is mostly carbon with variable amounts of other Chemical element, elements, chiefly hydrogen, sulfur, oxygen, and nitrogen ...

and iron bearing rocks that fueled

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 Earth#Surface, surface of the Earth or a solid-surface planet or moon, where lava, pyroclastics, and volcanic gases erupt through a break in the su ...

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 ...

Edinburgh Edinburgh ( ; gd, Dùn Èideann ) is the capital city of Scotland and one of its 32 Council areas of Scotland, council areas. Historically part of the county of Midlothian (interchangeably Edinburghshire before 1921), it is located in Lothian ...

being the remnant of a once much larger

volcano A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. On Earth, volcanoes are most often found where tectonic plates ...

active in the Carboniferous period some 300 million years ago. This area is relatively low-lying, although even here hills such as the

Ochils The Ochil Hills (; gd, Monadh Ochail is a range of hills in Scotland north of the Forth valley bordered by the towns of Stirling, Alloa, Kinross, Auchterarder and Perth. The only major roads crossing the hills pass through Glen Devon/ Gle ...

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. The ...

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 ...

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 bet ...

Boundary faults

The

runs from North Glen Sannox on the

Isle of Arran The Isle of Arran (; sco, Isle o Arran; gd, Eilean Arainn) or simply Arran is an island off the west coast of Scotland. It is the largest island in the Firth of Clyde and the seventh-largest Scottish island, at . Historically part of Butesh ...

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 govern ...

, 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 oc ...

, a

plate tectonic Plate tectonics (from the la, label=Late Latin, tectonicus, from the grc, τεκτονικός, lit=pertaining to building) is the generally accepted scientific theory that considers the Earth's lithosphere to comprise a number of large t ...

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. ...

to Mid

Devonian The Devonian ( ) is a geologic period and system of the Paleozoic era, spanning 60.3 million years from the end of the Silurian, million years ago (Mya), to the beginning of the Carboniferous, Mya. It is named after Devon, England, w ...

periods (520 to 400 million years ago), during the closure of the

Iapetus Ocean The Iapetus Ocean (; ) was an ocean that existed in the late Neoproterozoic and early Paleozoic eras of the geologic timescale (between 600 and 400 million years ago). The Iapetus Ocean was situated in the southern hemisphere, between the paleoc ...

. 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

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 ec ...

on the east coast from

."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 pop ...

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 list of Australian capital cities, capital and largest city of the Australian states and territories of Australia, state of Western Australia. It is the list of cities in Australia by population, fourth most populous city in Aust ...

and Dundee all lie in the Central Lowlands, and over half of

Scotland's population The demography of Scotland includes all aspects of population, past and present, in the area that is now Scotland. Scotland has a population of 5,463,300, as of 2019. The population growth rate in 2011 was estimated as 0.6% per annum according ...

lives in this region.

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

Geology and geomorphology

Boundary faults

Human geography

See also

References