Purbeck Marble is a fossiliferous limestone found in the

Isle of Purbeck The Isle of Purbeck is a peninsula in Dorset, England. It is bordered by water on three sides: the English Channel to the south and east, where steep cliffs fall to the sea; and by the marshy lands of the River Frome, Dorset, River Frome and Poo ...

, a

peninsula A peninsula is a landform that extends from a mainland and is only connected to land on one side. Peninsulas exist on each continent. The largest peninsula in the world is the Arabian Peninsula. Etymology The word ''peninsula'' derives , . T ...

in south-east

Dorset Dorset ( ; Archaism, archaically: Dorsetshire , ) is a Ceremonial counties of England, ceremonial county in South West England. It is bordered by Somerset to the north-west, Wiltshire to the north and the north-east, Hampshire to the east, t ...

, England. It is a variety of Purbeck stone that has been quarried since at least

Roman times In modern historiography, ancient Rome is the Roman civilisation from the founding of the Italian city of Rome in the 8th century BC to the collapse of the Western Roman Empire in the 5th century AD. It encompasses the Roman Kingd ...

as a decorative building stone.

Geology

Stratigraphically these limestone beds lie towards the top of the Durlston Formation of the

Purbeck Group The Purbeck Group is an Upper Jurassic to Lower Cretaceous lithostratigraphy, lithostratigraphic group (stratigraphy), group (a sequence of rock strata) in south-east England. The name is derived from the district known as the Isle of Purbeck in ...

. They were deposited during the

Berriasian In the geological timescale, the Berriasian is an age/ stage of the Early/Lower Cretaceous. It is the oldest subdivision in the entire Cretaceous. It has been taken to span the time between 143.1 ±0.6 Ma and 137.05 ± 0.2 (million years ago) ...

age of the

Early Cretaceous The Early Cretaceous (geochronology, geochronological name) or the Lower Cretaceous (chronostratigraphy, chronostratigraphic name) is the earlier or lower of the two major divisions of the Cretaceous. It is usually considered to stretch from 143.1 ...

epoch. Purbeck Marble is not a

metamorphic rock Metamorphic rocks arise from the transformation of existing rock to new types of rock in a process called metamorphism. The original rock ( protolith) is subjected to temperatures greater than and, often, elevated pressure of or more, caus ...

, like a true

marble Marble is a metamorphic rock consisting of carbonate minerals (most commonly calcite (CaCO3) or Dolomite (mineral), dolomite (CaMg(CO3)2) that have recrystallized under the influence of heat and pressure. It has a crystalline texture, and is ty ...

, but is so-called because it can take a fine polish. Its characteristic appearance comes from densely packed shells of the freshwater snail '' Viviparus''. Sussex Marble is similar in type. The 'marble' is properly classified as a biomicrudite, as it consists of large clasts (the snail shells) in a fine-grained limestone mud matrix. The individual marble beds (also known as 'seams'), lie between layers of softer marine clays and mudstone, laid down during repeated marine ingressions. Some of the beds contain iron oxide/hydroxide minerals, such as

hematite 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 . ...

limonite Limonite () is an iron ore consisting of a mixture of hydrated iron(III) oxide-hydroxides in varying composition. The generic formula is frequently written as , although this is not entirely accurate as the ratio of oxide to hydroxide can vary qu ...

, giving red or brown varieties, while other beds contain glauconite giving a green (or occasionally blue) colour.

Occurrence

Purbeck Marble is found at

outcrop An outcrop or rocky outcrop is a visible exposure of bedrock or ancient superficial deposits on the surface of the Earth and other terrestrial planets. Features Outcrops do not cover the majority of the Earth's land surface because in most p ...

, or beneath superficial cover, all the way across the Isle of Purbeck from Worbarrow Tout in the west to Peveril Point in the east. The marble beds are never more than 1.2 m thick and are often much thinner. The outcrops lie within the Purbeck Monocline, with the beds dipping moderately steeply to the north.

Use

There is a single example of Purbeck Marble being used during the

Bronze Age The Bronze Age () was a historical period characterised principally by the use of bronze tools and the development of complex urban societies, as well as the adoption of writing in some areas. The Bronze Age is the middle principal period of ...

, in a cist at Langton Matravers. During the

Romano-British The Romano-British culture arose in Britain under the Roman Empire following the Roman conquest in AD 43 and the creation of the province of Britannia. It arose as a fusion of the imported Roman culture with that of the indigenous Britons, ...

period, Purbeck Marble was used for inscriptions, architectural mouldings and veneers, mortars and pestles, and other articles. Purbeck Marble was also quarried in

medieval In the history of Europe, the Middle Ages or medieval period lasted approximately from the 5th to the late 15th centuries, similarly to the post-classical period of World history (field), global history. It began with the fall of the West ...

times and can be seen in virtually all the cathedrals of the south of England, in columns and slab panels and flooring. For example, it is used 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 ...

, Ely,

Norwich Norwich () is a cathedral city and district of the county of Norfolk, England, of which it is the county town. It lies by the River Wensum, about north-east of London, north of Ipswich and east of Peterborough. The population of the Norwich ...

Chichester Chichester ( ) is a City status in the United Kingdom, cathedral city and civil parish in the Chichester District, Chichester district of West Sussex, England.OS Explorer map 120: Chichester, South Harting and Selsey Scale: 1:25 000. Publisher ...

Salisbury Salisbury ( , ) is a city status in the United Kingdom, cathedral city and civil parish in Wiltshire, England with a population of 41,820, at the confluence of the rivers River Avon, Hampshire, Avon, River Nadder, Nadder and River Bourne, Wi ...

, Lincoln,

Llandaff Llandaff (; ; from 'church' and ''River Taff, Taf'') is a district, Community (Wales), community and coterminous electoral ward in the north of Cardiff, capital of Wales. It was incorporated into the city in 1922. It is the seat of the Bisho ...

Southwark Southwark ( ) is a district of Central London situated on the south bank of the River Thames, forming the north-western part of the wider modern London Borough of Southwark. The district, which is the oldest part of South London, developed ...

and

Canterbury Cathedral Canterbury Cathedral is the cathedral of the archbishop of Canterbury, the spiritual leader of the Church of England and symbolic leader of the worldwide Anglican Communion. Located in Canterbury, Kent, it is one of the oldest Christianity, Ch ...

s, and in

Westminster Abbey Westminster Abbey, formally titled the Collegiate Church of Saint Peter at Westminster, is an Anglican church in the City of Westminster, London, England. Since 1066, it has been the location of the coronations of 40 English and British m ...

. Additionally, it was utilised in the 13th-century King's Table, a furnishing previously used in coronation events. It has been less used in modern times, but a remarkable example is the church at Kingston, Purbeck, Dorset built in 1874–1880. Other

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 ...

of Purbeck Limestone are being quarried at the present time (2021). Purbeck Marble was previously extracted in 1993.Haysom, Treleven (1998), "Extracting Purbeck Marble", ''Hatcher Review'', 5(45), 48–54. Purbeck Marble is used by a number of contemporary sculptors, such as Emily Young. File:Temple church 906.jpg, Interlaced semicircular arches supported by Purbeck Marble shafts in the

Temple Church The Temple Church, a royal peculiar in the Church of England, is a church in the Inner Temple, Inner and Middle Temple, Middle Temple, London, Temples located between Fleet Street and the River Thames, built by the Knights Templar for their En ...

, London File:Beverley minster 014.JPG, The 13th-century south transept of Beverley Minster, richly decorated with Purbeck Marble shafts. File:Priest Coffin Lid - Shaftesbury Abbey & Museum.jpg, A carved sculpture in Purbeck Marble of a priest on a coffin lid from the

Shaftesbury Abbey Shaftesbury Abbey was an abbey that housed nuns in Shaftesbury, Dorset. It was founded in about 888, and Dissolution of the monasteries, dissolved in 1539 during the English Reformation by the order of Thomas Cromwell, minister to King Henry VI ...

collection..

References

External links

{{Commons category, Purbeck Marble
Geology of the Wessex Coast

Building stone Geology of Dorset Isle of Purbeck Limestone