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. * British national identity, the characteristics of British people and culture ...

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

, is composed of beds of red

sandstone Sandstone is a Clastic rock#Sedimentary clastic rocks, clastic sedimentary rock composed mainly of grain size, sand-sized (0.0625 to 2 mm) silicate mineral, silicate grains, Cementation (geology), cemented together by another mineral. Sand ...

and associated rocks laid down throughout the

Permian The Permian ( ) is a geologic period and System (stratigraphy), 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 251.902 Mya. It is the s ...

(300 million years ago) to the end of the

Triassic The Triassic ( ; sometimes symbolized 🝈) is a geologic period and system which spans 50.5 million years from the end of the Permian Period 251.902 million years ago ( Mya), to the beginning of the Jurassic Period 201.4 Mya. The Triassic is t ...

(about 200 million years ago), that underlie the

Jurassic The Jurassic ( ) is a Geological period, geologic period and System (stratigraphy), stratigraphic system that spanned from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period, approximately 143.1 Mya. ...

age Penarth Group. The name distinguishes it from the

Old Red Sandstone Old Red Sandstone, abbreviated ORS, 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 eastern seaboard of North America. It ...

which is largely

Devonian The Devonian ( ) is a period (geology), geologic period and system (stratigraphy), system of the Paleozoic era (geology), era during the Phanerozoic eon (geology), eon, spanning 60.3 million years from the end of the preceding Silurian per ...

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.Blatt, H., and R.J. Tracy, 1996, ''Petrology.'' New York, New York, ...

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 oce ...

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, pi ...

and

gypsum Gypsum is a soft sulfate mineral composed of calcium sulfate Hydrate, 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, drywall and blackboard or sidewalk ...

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

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

.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 Countries of the United Kingdom, country that is part of the United Kingdom. It contains nearly one-third of the United Kingdom's land area, consisting of the northern part of the island of Great Britain and more than 790 adjac ...

, at quarries in

Elgin Elgin may refer to: Places Canada * Elgin County, Ontario * Elgin Settlement, a 19th-century community for freed slaves located in present-day North Buxton and South Buxton, Ontario * Elgin, a village in Rideau Lakes, Ontario * Elgin, Manit ...

. It covers large parts of the

Moray Firth The Moray Firth (; , or ) is a roughly triangular inlet (or firth) of the North Sea, north and east of Inverness, which is in the Highland council area of the north of Scotland. It is the largest firth in Scotland, stretching from Duncans ...

Basin. In this area it overlies the

unconformably (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 Countries of the United Kingdom, country that is part of the United Kingdom. It is located on the island of Great Britain, of which it covers about 62%, and List of islands of England, more than 100 smaller adjacent islands. It ...

, where it generally forms a low-lying plain except for the Mid Severn Sandstone Plateau. Thick layers (up to thick) are present in the faulted Cheshire Basin which also extends beneath north

Shropshire Shropshire (; abbreviated SalopAlso used officially as the name of the county from 1974–1980. The demonym for inhabitants of the county "Salopian" derives from this name.) is a Ceremonial counties of England, ceremonial county in the West M ...

. 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. Due to the similarity, the term '' scarp'' may mistakenly be incorrectly used inte ...

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

Lancashire Lancashire ( , ; abbreviated ''Lancs'') is a ceremonial county in North West England. It is bordered by Cumbria to the north, North Yorkshire and West Yorkshire to the east, Greater Manchester and Merseyside to the south, and the Irish Sea to ...

and

Cumbria Cumbria ( ) is a ceremonial county in North West England. It borders the Scottish council areas of Dumfries and Galloway and Scottish Borders to the north, Northumberland and County Durham to the east, North Yorkshire to the south-east, Lancash ...

, and east of the

Pennines The Pennines (), also known as the Pennine Chain or Pennine Hills, are a range of highland, uplands mainly located in Northern England. Commonly described as the "Vertebral column, backbone of England" because of its length and position, the ra ...

it extends through

Nottinghamshire Nottinghamshire (; abbreviated ''Notts.'') is a ceremonial county in the East Midlands of England. The county is bordered by South Yorkshire to the north-west, Lincolnshire to the east, Leicestershire to the south, and Derbyshire to the west. Th ...

and central

Yorkshire Yorkshire ( ) is an area of Northern England which was History of Yorkshire, historically a county. Despite no longer being used for administration, Yorkshire retains a strong regional identity. The county was named after its county town, the ...

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

Dawlish Dawlish is a seaside resort town and civil parishes in England, civil parish in the Teignbridge district in Devon, England. It is located on the south coast of England at a distance of from the city of Exeter and a similar distance from the to ...

and East

Devon Devon ( ; historically also known as Devonshire , ) is a ceremonial county in South West England. It is bordered by the Bristol Channel to the north, Somerset and Dorset to the east, the English Channel to the south, and Cornwall to the west ...

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. Lit ...

, 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 and shale. Most of the particles of which the stone is composed are less than and are too small to ...

s and evaporite

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

. The sandstone units are monomineralic, consisting only of

quartz Quartz is a hard, crystalline mineral composed of silica (silicon dioxide). The Atom, atoms are linked in a continuous framework of SiO4 silicon–oxygen Tetrahedral molecular geometry, tetrahedra, with each oxygen being shared between two tet ...

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 . ...

(Fe₂O₃). The presence of this particular iron oxide is evidence for a terrestrial environment of deposition such as a

desert A desert is a landscape where little precipitation occurs and, consequently, living conditions create unique biomes and ecosystems. The lack of vegetation exposes the unprotected surface of the ground to denudation. About one-third of the la ...

, 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 a physical object resembles that of a perfect sphere. For example, the sphericity of the ball (bearing), balls inside a ball bearing determines the quality (business), quality of the bearing, ...

, are very well sorted 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) 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. These are

late Permian Late or LATE may refer to: Everyday usage * Tardy, or late, not being on time * Late (or the late) may refer to a person who is dead Music * ''Late'' (The 77s album), 2000 * Late (Alvin Batiste album), 1993 * Late!, a pseudonym used by Dave Groh ...

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 of the English Midlands, including primitive

synapsid Synapsida is a diverse group of tetrapod vertebrates that includes all mammals and their extinct relatives. It is one of the two major clades of the group Amniota, the other being the more diverse group Sauropsida (which includes all extant rept ...

s and

temnospondyl Temnospondyli (from Greek language, Greek τέμνειν, ''temnein'' 'to cut' and σπόνδυλος, ''spondylos'' 'vertebra') or temnospondyls is a diverse ancient order (biology), order of small to giant tetrapods—often considered Labyrinth ...

amphibians.

Building uses

Many ancient buildings of Devon Red Sandstone can be found in

Exeter Exeter ( ) is a City status in the United Kingdom, cathedral city and the county town of Devon in South West England. It is situated on the River Exe, approximately northeast of Plymouth and southwest of Bristol. In Roman Britain, Exeter w ...

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 by which name the local sandstone – actually a type of

breccia Breccia ( , ; ) is a rock composed of large angular broken fragments of minerals or Rock (geology), rocks cementation (geology), cemented together by a fine-grained matrix (geology), matrix. The word has its origins in the Italian language ...

– is generally known. * Rougemont Castle,

, c.1068 with earlier elements *

Crediton Parish Church Church of the Holy Cross, Crediton, formally the Collegiate Church of the Holy Cross and the Mother of Him Who Hung Thereon, is the parish church of the town of Crediton in Devon, England. The church is built on the site of what was the cathedral ...

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 unitary authority, borough of Torbay which was created in 1968. The Torbay area is a holiday destination known as the Engli ...

, Devo

* St Mary's Church, Totnes, 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 foreign archaeolog ...

, Exeter, Devon, 1868

Geographical distribution

Lithology

Fossil content

Building uses

See also

References

Further reading