The New Red Sandstone, chiefly in

British British may refer to: Peoples, culture, and language * British people, nationals or natives of the United Kingdom, British Overseas Territories, and Crown Dependencies. ** Britishness, the British identity and common culture * British English, ...

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

, is composed of beds of red

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 ...

and associated rocks laid down throughout the

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 Paleo ...

(300 million years ago) to the end of the

Triassic The Triassic ( ) is a geologic period and system which spans 50.6 million years from the end of the Permian Period 251.902 million years ago ( Mya), to the beginning of the Jurassic Period 201.36 Mya. The Triassic is the first and shortest per ...

(about 200 million years ago), that underlie the

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 ...

age

Penarth Group The Penarth Group is a Rhaetian age (Triassic) lithostratigraphic group (a sequence of rock strata) which is widespread in Britain. It is named from the seaside town of Penarth near Cardiff in south Wales where strata of this age are exposed in ...

. The name distinguishes it from the

Old Red Sandstone The Old Red Sandstone is an assemblage of rocks in the North Atlantic region largely of Devonian age. It extends in the east across Great Britain, Ireland and Norway, and in the west along the northeastern seaboard of North America. It also exte ...

which is largely

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, wh ...

in age, and with which it was originally confused due to their similar composition. Its upper layers consist 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.' ...

s, but most of the formation consists of reddish to yellowish sandstones, interbedded with rare

evaporite An evaporite () is a water- soluble sedimentary mineral deposit that results from concentration and crystallization by evaporation from an aqueous solution. There are two types of evaporite deposits: marine, which can also be described as ocean ...

minerals such as

halite Halite (), commonly known as rock salt, is a type of salt, the mineral (natural) form of sodium chloride ( Na Cl). Halite forms isometric crystals. The mineral is typically colorless or white, but may also be light blue, dark blue, purple, p ...

and

gypsum Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula . It is widely mined and is used as a fertilizer and as the main constituent in many forms of plaster, blackboard or sidewalk chalk, and drywa ...

. These indicate deposition within a hot and arid palaeo-environment, such as a desert or

sabkha A sabkha ( ar, سبخة) is a coastal, supratidal mudflat or sandflat in which evaporite-saline minerals accumulate as the result of semiarid to arid climate. Sabkhas are gradational between land and intertidal zone within restricted coastal p ...

.Benton MJ and Walker AD. 1985. Palaeoecology, taphonomy and dating of Permo-Triassic reptiles from Elgin, North-East Scotland. Palaeontology 28:207–234.

Geographical distribution

The New Red Sandstone was originally identified in

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 ...

, at quarries in Elgin. It covers large parts of the

Moray Firth The Moray Firth (; Scottish Gaelic: ''An Cuan Moireach'', ''Linne Mhoireibh'' or ''Caolas Mhoireibh'') is a roughly triangular inlet (or firth) of the North Sea, north and east of Inverness, which is in the Highland council area of north of Sc ...

Basin. In this area it overlies the

unconformably An unconformity is a buried erosional or non-depositional surface separating two rock masses or strata of different ages, indicating that sediment deposition was not continuous. In general, the older layer was exposed to erosion for an interval ...

(missing the intervening rocks), and both sandstones were used extensively in architecture in the Highlands and Islands of Scotland. It also covers much of central

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 ...

, where it generally forms a low-lying plain except for the

Mid Severn Sandstone Plateau The Mid Severn Sandstone Plateau is a rural landscape and one of the natural regions of central England, straddling the border between the counties of Shropshire and Staffordshire. It stretches from the western fringes of the Birmingham conurba ...

. Thick layers (up to thick) are present in the faulted

Cheshire Basin The Cheshire Basin is a late Palaeozoic and Mesozoic sedimentary basin extending under most of the county of Cheshire in northwest England. It extends northwards into the Manchester area and south into Shropshire. The basin possesses something of t ...

which also extends beneath north

Shropshire Shropshire (; alternatively Salop; abbreviated in print only as Shrops; demonym Salopian ) is a landlocked historic county in the West Midlands region of England. It is bordered by Wales to the west and the English counties of Cheshire to ...

. There are numerous

escarpment An escarpment is a steep slope or long cliff that forms as a result of faulting or erosion and separates two relatively level areas having different elevations. The terms ''scarp'' and ''scarp face'' are often used interchangeably with ''esca ...

s forming small prominent hills within this area. The sandstone also underlies parts of

Lancashire Lancashire ( , ; abbreviated Lancs) is the name of a historic county, ceremonial county, and non-metropolitan county in North West England. The boundaries of these three areas differ significantly. The non-metropolitan county of Lancas ...

and

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 east of 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 ...

it extends through

Nottinghamshire Nottinghamshire (; abbreviated Notts.) is a landlocked county in the East Midlands region of England, bordering South Yorkshire to the north-west, Lincolnshire to the east, Leicestershire to the south, and Derbyshire to the west. The trad ...

and central

Yorkshire Yorkshire ( ; abbreviated Yorks), formally known as the County of York, is a Historic counties of England, historic county in northern England and by far the largest in the United Kingdom. Because of its large area in comparison with other Eng ...

. Smaller outcrops occur in other parts of Britain such as the Red Cliffs of

Dawlish Dawlish is an English seaside resort town and civil parish in Teignbridge on the south coast of Devon, from the county town of Exeter and from the larger resort of Torquay. Its 2011 population of 11,312 was estimated at 13,355 in 2019. It is ...

and East

Devon Devon ( , historically known as Devonshire , ) is a ceremonial and non-metropolitan county in South West England. The most populous settlement in Devon is the city of Plymouth, followed by Devon's county town, the city of Exeter. Devo ...

Lithology

In terms of its

lithology The lithology of a rock unit is a description of its physical characteristics visible at outcrop, in hand or core samples, or with low magnification microscopy. Physical characteristics include colour, texture, grain size, and composition. Li ...

, the New Red Sandstone comprises true sandstones,

mudrock Mudrocks are a class of fine-grained siliciclastic sedimentary rocks. The varying types of mudrocks include siltstone, claystone, mudstone, slate, and shale. Most of the particles of which the stone is composed are less than and are too ...

s and evaporite

strata In geology and related fields, a stratum ( : strata) is a layer of rock or sediment characterized by certain lithologic properties or attributes that distinguish it from adjacent layers from which it is separated by visible surfaces known as e ...

. The sandstone units are monomineralic, consisting only of

quartz Quartz is a hard, crystalline mineral composed of silica ( silicon dioxide). The atoms are linked in a continuous framework of SiO4 silicon-oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical f ...

grains (negligible amounts of other minerals may be present), and they are cemented together with the ferric iron oxide

haematite Hematite (), also spelled as haematite, is a common iron oxide compound with the formula, Fe2O3 and is widely found in rocks and soils. Hematite crystals belong to the rhombohedral lattice system which is designated the alpha polymorph of . I ...

(Fe₂O₃). The presence of this particular iron oxide is evidence for a

terrestrial Terrestrial refers to things related to land or the planet Earth. Terrestrial may also refer to: * Terrestrial animal, an animal that lives on land opposed to living in water, or sometimes an animal that lives on or near the ground, as opposed to ...

environment of deposition such as a

desert A desert is a barren area of landscape where little precipitation occurs and, consequently, living conditions are hostile for plant and animal life. The lack of vegetation exposes the unprotected surface of the ground to denudation. About on ...

, and gives the rocks the red colour which they are named after. The common effect of

rusting Rust is an iron oxide, a usually reddish-brown oxide formed by the reaction of iron and oxygen in the catalytic presence of water or air moisture. Rust consists of hydrous iron(III) oxides (Fe2O3·nH2O) and iron(III) oxide-hydroxide (FeO(OH) ...

produces exactly the same deposit, but as a result of a different process. The sandstone units generally lack

fossils A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved ...

(as do most terrestrial rocks). The grains in the member have a high degree of

sphericity Sphericity is a measure of how closely the shape of an object resembles that of a perfect sphere. For example, the sphericity of the balls inside a ball bearing determines the quality of the bearing, such as the load it can bear or the speed a ...

, are very

well sorted Sorting describes the distribution of grain size of sediments, either in unconsolidated deposits or in sedimentary rocks. This should not be confused with crystallite size, which refers to the individual size of a crystal in a solid. Crystallite ...

and typically have a small size range (). The NRS is a texturally mature rock. Certain units of the New Red Sandstone (e.g. Hopeman Sandstone Formation and

Helsby Sandstone Formation The Sherwood Sandstone Group is a Triassic lithostratigraphic group (a sequence of rock strata) which is widespread in Britain, especially in the English Midlands. The name is derived from Sherwood Forest in Nottinghamshire which is underlain b ...

) feature commonly as building stone due to their abundance and mechanical strength.

Fossil content

The New Red Sandstone has yielded many fossils, including the world-famous

Elgin Reptiles Elgin Reptiles is the name given to the Permian and Triassic fossils found in the sandstone deposits in and around the town of Elgin, in Moray, Scotland. They are of historical and scientific importance, and many of the specimens are housed in the ...

. These are

late Permian Late may refer to: * LATE, an acronym which could stand for: ** Limbic-predominant age-related TDP-43 encephalopathy, a proposed form of dementia ** Local-authority trading enterprise, a New Zealand business law ** Local average treatment effect, ...

to Late Triassic in age, and include mammal-like reptiles and some of the earliest predecessors of dinosaurs. An earliest Permian (

Asselian In the geologic timescale, the Asselian is the earliest geochronologic age or lowermost chronostratigraphic stage of the Permian. It is a subdivision of the Cisuralian Epoch or Series. The Asselian lasted between and million years ago (Ma) ...

) fauna is known from the

Kenilworth Sandstone Formation Kenilworth ( ) is a market town and civil parish in the Warwick District in Warwickshire, England, south-west of Coventry, north of Warwick and north-west of London. It lies on Finham Brook, a tributary of the River Sowe, which joins the ...

of the English Midlands, including primitive

synapsid Synapsids + (, 'arch') > () "having a fused arch"; synonymous with ''theropsids'' (Greek, "beast-face") are one of the two major groups of animals that evolved from basal amniotes, the other being the sauropsids, the group that includes reptil ...

s and

temnospondyl Temnospondyli (from Greek τέμνειν, ''temnein'' 'to cut' and σπόνδυλος, ''spondylos'' 'vertebra') is a diverse order of small to giant tetrapods—often considered primitive amphibians—that flourished worldwide during the Carb ...

amphibians.

Building uses

Rougemont Castle gatehouse, 2010 (cropped)

Many ancient buildings of Devon Red Sandstone can be found in

Exeter Exeter () is a city in Devon, South West England. It is situated on the River Exe, approximately northeast of Plymouth and southwest of Bristol. In Roman Britain, Exeter was established as the base of Legio II Augusta under the personal comm ...

the ancient capital of

, notably the castle, Roman / medieval city walls, several churches and many buildings of the Cathedral Close. The local quarry was at

Heavitree Heavitree is a historic village and parish situated formerly outside the walls of the City of Exeter in Devon, England, and is today an eastern district of that city. It was formerly the first significant village outside the city on the road to ...

by which name the local sandstone – actually a type of

breccia Breccia () is a rock composed of large angular broken fragments of minerals or rocks cemented together by a fine-grained matrix. The word has its origins in the Italian language, in which it means "rubble". A breccia may have a variety of ...

– is generally known. *

Rougemont Castle Rougemont Castle, also known as Exeter Castle, is the historic castle of the city of Exeter, Devon, England. It was built into the northern corner of the Roman city walls starting in or shortly after the year 1068, following Exeter's rebellion ...

, c.1068 with earlier elements *

Crediton Parish Church Crediton Parish Church, formally the Collegiate Church of the Holy Cross and the Mother of Him who Hung Thereon, is a prominent building and worshipping community in the Devon town of Crediton. The church is built on the site of what was the " ...

founded c910, dates from c.1130 with earlier elements * St Petrock's Church, Exeter, Devon, before 11

* St Olave's Church, Exeter, Devon founded 105

* Bishops Palace,

Paignton Paignton ( ) is a seaside town on the coast of Tor Bay in Devon, England. Together with Torquay and Brixham it forms the borough of Torbay which was created in 1998. The Torbay area is a holiday destination known as the English Riviera. Paig ...

, Devo

*

St Mary's Church, Totnes St Mary's Church, Totnes is a Grade I listed parish church in the Church of England Diocese of Exeter in Totnes, Devon. History The church was built as part of the Benedictine Priory of St Mary. The townspeople came to an arrangement with th ...

, Devon, c 145

*

Royal Albert Memorial Museum Royal Albert Memorial Museum & Art Gallery (RAMM) is a museum and art gallery in Exeter, Devon, the largest in the city. It holds significant and diverse collections in areas such as zoology, anthropology, fine art, local and overseas archaeolo ...

, Exeter, Devon, 1868

Geographical distribution

Lithology

Fossil content

Building uses

See also

References

Further reading