: ''This article describes the

geology Geology () is a branch of natural science concerned with Earth and other astronomical objects, the features or rocks of which it is composed, and the processes by which they change over time. Modern geology significantly overlaps all other Ear ...

of the metropolitan county of Tyne and Wear in northeast

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 b ...

. It includes the cities of

Newcastle upon Tyne Newcastle upon Tyne ( RP: , ), or simply Newcastle, is a city and metropolitan borough in Tyne and Wear, England. The city is located on the River Tyne's northern bank and forms the largest part of the Tyneside built-up area. Newcastle is ...

and

Sunderland Sunderland () is a port city in Tyne and Wear, England. It is the City of Sunderland's administrative centre and in the Historic counties of England, historic county of County of Durham, Durham. The city is from Newcastle-upon-Tyne and is on t ...

and the modern

metropolitan borough A metropolitan borough (or metropolitan district) is a type of local government district in England. Created in 1974 by the Local Government Act 1972, metropolitan boroughs are defined in English law as metropolitan districts within metropolitan ...

s of

Gateshead Gateshead () is a large town in northern England. It is on the River Tyne's southern bank, opposite Newcastle upon Tyne, Newcastle to which it is joined by seven bridges. The town contains the Gateshead Millennium Bridge, Millennium Bridge, Sage ...

, North Tyneside and South Tyneside. Prior to 1974 that part of the county north of the

River Tyne The River Tyne is a river in North East England. Its length (excluding tributaries) is . It is formed by the North Tyne and the South Tyne, which converge at Warden Rock near Hexham in Northumberland at a place dubbed 'The Meeting of the Wate ...

was a part of the historic county of

Northumberland Northumberland () is a county in Northern England, one of two counties in England which border with Scotland. Notable landmarks in the county include Alnwick Castle, Bamburgh Castle, Hadrian's Wall and Hexham Abbey. It is bordered by land on ...

whilst that to the south was a part of

County Durham County Durham ( ), officially simply Durham,UK General Acts 1997 c. 23Lieutenancies Act 1997 Schedule 1(3). From legislation.gov.uk, retrieved 6 April 2022. is a ceremonial county in North East England.North East Assembly �About North East E ...

'' The geology of Tyne and Wear in northeast

largely consists of a suite of

sedimentary Sedimentary rocks are types of rock (geology), rock that are formed by the accumulation or deposition of mineral or organic matter, organic particles at Earth#Surface, Earth's surface, followed by cementation (geology), cementation. Sedimentati ...

rocks dating from 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 ''Carbonifero ...

and

Permian The Permian ( ) is a geologic period and stratigraphic system which spans 47 million years from the end of the Carboniferous Period million years ago (Mya), to the beginning of the Triassic Period 251.9 Mya. It is the last period of the Paleoz ...

periods into which were intruded

igneous Igneous rock (derived from the Latin word ''ignis'' meaning fire), or magmatic rock, is one of the three main rock types, the others being sedimentary and metamorphic. Igneous rock is formed through the cooling and solidification of magma or ...

dykes during the later

Palaeogene The Paleogene ( ; also spelled Palaeogene or Palæogene; informally Lower Tertiary or Early Tertiary) is a geologic period and system that spans 43 million years from the end of the Cretaceous Period million years ago ( Mya) to the beginning o ...

Period.

Carboniferous

Rocks of the Millstone Grit Group underlie the area.

Coal Measures

The Pennine Coal Measures Group comprises a Lower, a Middle and an Upper formation, each of which consists of

mudstone Mudstone, a type of mudrock, is a fine-grained sedimentary rock whose original constituents were clays or muds. Mudstone is distinguished from '' shale'' by its lack of fissility (parallel layering).Blatt, H., and R.J. Tracy, 1996, ''Petrology. ...

siltstone Siltstone, also known as aleurolite, is a clastic sedimentary rock that is composed mostly of silt. It is a form of mudrock with a low clay mineral content, which can be distinguished from shale by its lack of fissility.Blatt ''et al.'' 1980, p ...

s and

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 silicates) ...

s and with, in the case of the two lower formations, numerous

coal seam Coal mining is the process of extracting coal from the ground. Coal is valued for its energy content and since the 1880s has been widely used to generate electricity. Steel and cement industries use coal as a fuel for extraction of iron from ...

Permian

Rocks of

age occur from

South Shields South Shields () is a coastal town in South Tyneside, Tyne and Wear, England. It is on the south bank of the mouth of the River Tyne. Historically, it was known in Roman times as Arbeia, and as Caer Urfa by Early Middle Ages. According to the 20 ...

southwards through

to the border with

south of Hetton-le-Hole. The Magnesian Limestone forms a broken west-facing scarp raised above the Middle and Upper Coal Measures country to its west. In addition there are small outliers of Permian strata north of the

Tynemouth Tynemouth () is a coastal town in the metropolitan borough of North Tyneside, North East England. It is located on the north side of the mouth of the River Tyne, hence its name. It is 8 mi (13 km) east-northeast of Newcastle upon T ...

, Cullercoats, Whitley Bay and

Forest Hall Forest Hall is a town in the borough of North Tyneside in the United Kingdom. It is a north eastern suburb of Newcastle and lies six kilometres from the city centre. It borders Killingworth to the north, Holystone to the east and Benton to the so ...

Zechstein Group

The group comprises the following formations: *Roker Formation *Ford Formation *Raisby Formation *Yellow Sands Formation

Palaeogene dykes

The 'Tynemouth Dyke' is a

intrusion In geology, an igneous intrusion (or intrusive body or simply intrusion) is a body of intrusive igneous rock that forms by crystallization of magma slowly cooling below the surface of the Earth. Intrusions have a wide variety of forms and com ...

of tholeiitic

dolerite Diabase (), also called dolerite () or microgabbro, is a mafic, holocrystalline, subvolcanic rock equivalent to volcanic basalt or plutonic gabbro. Diabase dikes and sills are typically shallow intrusive bodies and often exhibit fine-grained ...

which cuts the southern edge of

Tynemouth Castle Tynemouth Castle is located on a rocky headland (known as Pen Bal Crag), overlooking Tynemouth Pier. The moated castle-towers, gatehouse and keep are combined with the ruins of the Benedictine priory where early kings of Northumbria were buri ...

. The 'Walbottle Dyke' is

microgabbro Diabase (), also called dolerite () or microgabbro, is a mafic, holocrystalline, subvolcanic rock equivalent to volcanic basalt or plutonic gabbro. Diabase dikes and sills are typically shallow intrusive bodies and often exhibit fine-grained ...

and forms part of a minor swarm of such dykes which are ultimately related to the

Isle of Mull The Isle of Mull ( gd, An t-Eilean Muileach ) or just Mull (; gd, Muile, links=no ) is the second-largest island of the Inner Hebrides (after Skye) and lies off the west coast of Scotland in the Council areas of Scotland, council area of Arg ...

volcanic centre. The 'Hebburn Dyke' is another microgabbro which runs ESE from

Newcastle-upon-Tyne Newcastle upon Tyne ( RP: , ), or simply Newcastle, is a city and metropolitan borough in Tyne and Wear, England. The city is located on the River Tyne's northern bank and forms the largest part of the Tyneside built-up area. Newcastle is als ...

through

Hebburn Hebburn is a town in the metropolitan county of Tyne and Wear, England. It governed under the borough of South Tyneside; formerly governed under the county of Durham until 1974 with its own urban district from 1894 until 1974. It is on the south ...

to the coast at Whitburn.

Quaternary

The larger part of Tyne and Wear is covered with a varying thickness of

glacial till image:Geschiebemergel.JPG, Closeup of glacial till. Note that the larger grains (pebbles and gravel) in the till are completely surrounded by the matrix of finer material (silt and sand), and this characteristic, known as ''matrix support'', is d ...

dating from the last ice age. Glacial sand and gravel is also widespread. Glacial lake deposits occur within the

Team valley Team Valley is a trading estate located in Gateshead. It is home to the Retail World retail park, with many large, international companies are based in the area's trading estate. In 2017, there were approximately 700 companies on the estate, empl ...

, a legacy of Glacial Lake Wear which resulted from the eastward flow of the region's rivers being blocked by North Sea ice at one time. The valleys of the Tyne and its tributaries the River Team and the River Derwent are floored by

alluvium Alluvium (from Latin ''alluvius'', from ''alluere'' 'to wash against') is loose clay, silt, sand, or gravel that has been deposited by running water in a stream bed, on a floodplain, in an alluvial fan or beach, or in similar settings. Alluv ...

. Blown sand in the form of restricted areas of dunes is present on sections of the coast. The

Pelaw Pelaw () is a residential area in Gateshead, located around from Newcastle upon Tyne, from Sunderland, and from Durham. In 2011, Census data for the Gateshead Metropolitan Borough Council ward of ''Heworth and Pelaw'' recorded a total populatio ...

or Upper Clay is widespread in the area and is interpreted as a flow till mixed with soliflucted material in places. It is generally between 1.5 and 3 m thick but reaches a depth of 4 m between South Shields and

Washington Washington commonly refers to: * Washington (state), United States * Washington, D.C., the capital of the United States ** A metonym for the federal government of the United States ** Washington metropolitan area, the metropolitan area centered on ...

References

{{Geology of England , state=expanded Geography of Tyne and Wear