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Castell Dinas Brân is a
medieval In the history of Europe, the Middle Ages or medieval period lasted approximately from the late 5th to the late 15th centuries, similar to the post-classical period of global history. It began with the fall of the Western Roman Empire a ...
castle A castle is a type of fortified structure built during the Middle Ages predominantly by the nobility or royalty and by military orders. Scholars debate the scope of the word ''castle'', but usually consider it to be the private fortified r ...
, built by the Princes of
Powys Fadog Powys Fadog (English: ''Lower Powys'' or ''Madog's Powys'') was the northern portion of the former princely realm of Powys, which split in two following the death of Madog ap Maredudd in 1160. The realm was divided under Welsh law, with Madog's ...
, who occupy a prominent hilltop site above the town of
Llangollen Llangollen () is a town and community, situated on the River Dee, in Denbighshire, Wales. Its riverside location forms the edge of the Berwyn range, and the Dee Valley section of the Clwydian Range and Dee Valley Area of Outstanding Natural Bea ...
in
Denbighshire Denbighshire ( ; cy, Sir Ddinbych; ) is a county in the north-east of Wales. Its borders differ from the historic county of the same name. This part of Wales contains the country's oldest known evidence of habitation – Pontnewydd (Bontnewy ...
,
Wales Wales ( cy, Cymru ) is a country that is part of the United Kingdom. It is bordered by England to the east, the Irish Sea to the north and west, the Celtic Sea to the south west and the Bristol Channel to the south. It had a population in ...
. The presently visible stone castle was probably built in the 1260s by Gruffydd Maelor II, a prince of Powys Fadog, on the site of several earlier structures, including an
Iron Age The Iron Age is the final epoch of the three-age division of the prehistory and protohistory of humanity. It was preceded by the Stone Age ( Paleolithic, Mesolithic, Neolithic) and the Bronze Age ( Chalcolithic). The concept has been mostly ...
hillfort A hillfort is a type of earthwork used as a fortified refuge or defended settlement, located to exploit a rise in elevation for defensive advantage. They are typically European and of the Bronze Age or Iron Age. Some were used in the post-Roma ...
. ''Dinas Brân'' has been variously translated as the "crow's fortress" or "fortress of Brân", with ''Brân'' as the name of an individual or of a nearby stream. An English name, "Crow Castle", has also been used since at least the 18th century.


Name

The name Dinas Brân has been debated since at least the 17th century. In modern times it is sometimes incorrectly translated as ''the City of Crows'': the word ''dinas'', "city" in modern Welsh, in
Middle Welsh Middle Welsh ( cy, Cymraeg Canol, wlm, Kymraec) is the label attached to the Welsh language of the 12th to 15th centuries, of which much more remains than for any earlier period. This form of Welsh developed directly from Old Welsh ( cy, Hen G ...
signifies a defended enclosure, while ''brân'' is the Welsh for "crow", singular, (plural: ''brain''), suggesting a meaning "the crow's fortress". An alternative theory is that Brân is a personal name.
Humphrey Llwyd Humphrey Llwyd (also spelled Lhuyd) (1527–1568) was a Welsh cartographer, author, antiquary and Member of Parliament. He was a leading member of the Renaissance period in Wales along with other such men as Thomas Salisbury and William ...
and
William Camden William Camden (2 May 1551 – 9 November 1623) was an English antiquarian, historian, topographer, and herald, best known as author of ''Britannia'', the first chorographical survey of the islands of Great Britain and Ireland, and the ''Ann ...
both suggested it came from that of a Gaulish chieftain, "Brennus". There is a legend which says that Brân was a Cornish prince, the son of the
Duke of Cornwall Duke of Cornwall is a title in the Peerage of England, traditionally held by the eldest son of the reigning British monarch, previously the English monarch. The duchy of Cornwall was the first duchy created in England and was established by a r ...
, while another suggests Brân could be named for King Brân Fendigaid (the Blessed) also called Bendigeidfran, a Celtic God who appears in both Welsh and Irish mythology. Camden also suggested the name was simply derived from the word ''bryn'', "hill". A further suggestion is that ''Brân'' simply refers to a mountain stream of the same name which originated in the Eglwyseg Rocks and ran at the northern foot of the hill, a suggestion made by
Thomas Pennant Thomas Pennant (14 June OS 172616 December 1798) was a Welsh naturalist, traveller, writer and antiquarian. He was born and lived his whole life at his family estate, Downing Hall near Whitford, Flintshire, in Wales. As a naturalist he had ...
amongst others. The 17th century scholar
Edward Lhuyd Edward Lhuyd FRS (; occasionally written Llwyd in line with modern Welsh orthography, 1660 – 30 June 1709) was a Welsh naturalist, botanist, linguist, geographer and antiquary. He is also named in a Latinate form as Eduardus Luidius. Life ...
, in ''Adversaria'', confirmed that to his knowledge the name ''Brân'' came from "''the brook of this name by Lhangollen''". As with several other streams in Wales, the word ''Brân'' was applied to the brook apparently due to the black colour of its water. The castle is known in English as "Crow Castle". This form of the name has been used since at least the 18th century, having been recorded in
Gough Gough ( ) is a surname. The surname probably derives from the Welsh (English: "red"), given as a nickname to someone with red hair or a red complexion or as a reduced form of the Irish McGough which itself is an Anglicized form of Gaelic , a patr ...
's edition of William Camden's Britannia. By the mid 19th century this was the form of the name said to be used by most of the inhabitants of Llangollen, where there was an inn of the same name.


History


Iron age

During the
British Iron Age The British Iron Age is a conventional name used in the archaeology of Great Britain, referring to the prehistoric and protohistoric phases of the Iron Age culture of the main island and the smaller islands, typically excluding prehistoric I ...
, around 600BCE, a large
hillfort A hillfort is a type of earthwork used as a fortified refuge or defended settlement, located to exploit a rise in elevation for defensive advantage. They are typically European and of the Bronze Age or Iron Age. Some were used in the post-Roma ...
was built on the summit of what was to become Dinas Brân by a Celtic tribe named the
Ordovices The Ordovīcēs (Common Brittonic: *''Ordowīcī'') were one of the Celtic tribes living in Great Britain before the Roman invasion. Their tribal lands were located in present-day North Wales and England, between the Silures to the south and the ...
. An earthen rampart - probably with a wooden
palisade A palisade, sometimes called a stakewall or a paling, is typically a fence or defensive wall made from iron or wooden stakes, or tree trunks, and used as a defensive structure or enclosure. Palisades can form a stockade. Etymology ''Palisade ...
- surrounded a number of roundhouses and an extra deep ditch was cut to defend the gentler slopes on the southern side of the hill. This was one of many strongholds belonging to the Ordovices in this part of North Wales. In the west are
Craig Rhiwarth Craig Rhiwarth is a mountain in the Berwyn range, in Powys (formerly Montgomeryshire), Wales, overlooking the village of Llangynog to the south. On the summit is an Iron Age hillfort, and there are remains of slate quarrying on the southern slo ...
in the Berwyn Range and
Dinas Emrys Dinas Emrys () is a rocky and wooded hillock near Beddgelert in Gwynedd, north-west Wales. Rising some above the floor of the Glaslyn river valley, it overlooks the southern end of Llyn Dinas in Snowdonia. Little remains of the Iron Age hillfor ...
near
Beddgelert Beddgelert () is a village and community in the Snowdonia area of Gwynedd, Wales. The population of the community taken at the 2011 census was 455, and includes Nantmor and Nant Gwynant. It is reputed to be named after the legendary hound ...
in Gwynedd. In the east are Castell Dinas Brân itself,
Caer Drewyn Caer Drewyn is an early Iron Age hillfort to the north of the town of Corwen, Denbighshire (Grid reference ). It has a large stone rampart with entrances on the west and north sides; there is a guard chamber within the north-east entrance, and ...
, Caer Euni and Moel y Gaer near the
Horseshoe Pass The Horseshoe Pass ( cy, Bwlch yr Oernant, "Pass of the Cold Stream") is a mountain pass in Denbighshire, north-east Wales Wales ( cy, Cymru ) is a country that is part of the United Kingdom. It is bordered by England to the east, the Iri ...
. The inhabitants of Old Oswestry hillfort were either from the tribes of the Ordovices or
Cornovii The Cornovii is the name by which two, or three, tribes were known in Roman Britain. One tribe was in the area centred on present-day Shropshire, one was in Caithness in northernmost Scotland, and there was probably one in Cornwall. The name h ...
and Iron Age hillforts in the Clwydian Range to the north (including
Foel Fenlli Foel Fenlli or Moel Fenlli is a hill in Denbighshire, North Wales. With a summit at an elevation of , it is the second highest peak of the Clwydian Range. A popular ascent leads south from the car park at Bwlch Penbarras, which is also a popula ...
and Moel Arthur) were occupied by the neighbouring Deceangli. The Ordovices were also neighboured to the north-west by the Gangani, to the east by the Cornovii, to the south by the
Silures The Silures ( , ) were a powerful and warlike tribe or tribal confederation of ancient Britain, occupying what is now south east Wales and perhaps some adjoining areas. They were bordered to the north by the Ordovices; to the east by the Dobun ...
and south-west by the Demetae. In 1879 the pioneering English geologist Charles Lapworth named the
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. T ...
geological period The geologic time scale, or geological time scale, (GTS) is a representation of time based on the rock record of Earth. It is a system of chronological dating that uses chronostratigraphy (the process of relating strata to time) and geoc ...
after the Ordovices as the rock formations he had studied were located in the tribe's former North Welsh domain. * Lapworth wrote (''op. cit''., pp. 13 – 14): "North Wales itself – at all events the whole of the great Bala district where Sedgwick first worked out the physical succession among the rocks of the intermediate or so-called Upper Cambrian or Lower Silurian system; and in all probability much of the Shelve and the Caradoc area, whence Murchison first published its distinctive fossils – lay within the territory of the Ordovices; ... Here, then, have we the hint for the appropriate title for the central system of the Lower
Palaeozoic 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 '' ...
s. It should be called the Ordovician System, after this old British tribe."


Post Roman Britain

The earliest structure that might have been built at Dinas Brân is believed to have belonged to Elisedd ap Gwylog during the 8th century. Elisedd, who was a Romano British ruler during the
Anglo-Saxon settlement of Britain The Anglo-Saxon settlement of Britain is the process which changed the language and culture of most of what became England from Romano-British to Germanic. The Germanic-speakers in Britain, themselves of diverse origins, eventually develo ...
is named on the Pillar of Eliseg and is considered one of the founders of the
Kingdom of Powys The Kingdom of Powys ( cy, Teyrnas Powys; la, Regnum Poysiae) was a Welsh successor state, petty kingdom and principality that emerged during the Middle Ages following the end of Roman rule in Britain. It very roughly covered the northern t ...
, however, no archaeological evidence for any structure from this period has been found.


Late Medieval period

Dinas Brân may have been a fortification in the
Kingdom of Powys The Kingdom of Powys ( cy, Teyrnas Powys; la, Regnum Poysiae) was a Welsh successor state, petty kingdom and principality that emerged during the Middle Ages following the end of Roman rule in Britain. It very roughly covered the northern t ...
. When its last Prince, Gruffydd Maelor, died in 1191, his kingdom was divided into
Powys Fadog Powys Fadog (English: ''Lower Powys'' or ''Madog's Powys'') was the northern portion of the former princely realm of Powys, which split in two following the death of Madog ap Maredudd in 1160. The realm was divided under Welsh law, with Madog's ...
in the north and
Powys Wenwynwyn Powys Wenwynwyn or Powys Cyfeiliog was a Welsh kingdom which existed during the high Middle Ages. The realm was the southern portion of the former princely state of Powys which split following the death of Madog ap Maredudd of Powys in 1160: the ...
in the south. His son, Madog ap Gruffydd Maelor, the lord of Powys Fadog, who founded Valle Crucis Abbey at
Llantysilio Llantysilio ( cy, Llandysilio-yn-Iâl) is a community in Denbighshire, Wales Wales ( cy, Cymru ) is a country that is part of the United Kingdom. It is bordered by England to the east, the Irish Sea to the north and west, the Celtic Se ...
in 1201 might have ruled from Dinas Brân. Whatever structure existed at this site, it would have been a wooden fortification probably consisting of a wooden palisade surrounding a hall and other buildings. Early records attest to this early castle being destroyed by fire. Following the destruction of the wooden castle, Gruffydd II ap Madog, Lord of Dinas Bran, the son of Madog ap Gruffydd Maelor, rebuilt Dinas Brân in stone sometime in the 1260s. At the time Gruffydd II ap Madog was an ally of Prince
Llywelyn ap Gruffudd Llywelyn ap Gruffudd (c. 1223 – 11 December 1282), sometimes written as Llywelyn ap Gruffydd, also known as Llywelyn the Last ( cy, Llywelyn Ein Llyw Olaf, lit=Llywelyn, Our Last Leader), was the native Prince of Wales ( la, Princeps Wall ...
Prince of Wales, with Powys acting as a
buffer state A buffer state is a country geographically lying between two rival or potentially hostile great powers. Its existence can sometimes be thought to prevent conflict between them. A buffer state is sometimes a mutually agreed upon area lying between t ...
between Llywelyn's heartland of
Gwynedd Gwynedd (; ) is a county and preserved county (latter with differing boundaries; includes the Isle of Anglesey) in the north-west of Wales. It shares borders with Powys, Conwy County Borough, Denbighshire, Anglesey over the Menai Strait, an ...
and
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 ...
. Dinas Brân was one of several castles being built following the signing of the
Treaty of Montgomery The Treaty of Montgomery was an Anglo-Welsh treaty signed on 29 September 1267 in Montgomeryshire by which Llywelyn ap Gruffudd was acknowledged as Prince of Wales by King Henry III of England (r. 1216–1272). It was the only time an English ...
which had secured Wales for Llywelyn, free from English interference. The castle at Dolforwyn Castle near Newtown, which was ordered to be built by Llywelyn around the same time, has some similarities to Dinas Brân and may have been the work of the same master mason. When Gruffudd died in 1269 or 1270, the castle was inherited by his four sons. Madoc the eldest son was senior but each of the sons may have had apartments at Dinas Brân. The peace between Llywelyn and
Edward I Edward I (17/18 June 1239 – 7 July 1307), also known as Edward Longshanks and the Hammer of the Scots, was King of England and Lord of Ireland from 1272 to 1307. Concurrently, he ruled the duchies of Aquitaine and Gascony as a vas ...
did not last long. In 1277 Edward launched the Conquest of North Wales from
Chester Chester is a cathedral city and the county town of Cheshire, England. It is located on the River Dee, close to the English–Welsh border. With a population of 79,645 in 2011,"2011 Census results: People and Population Profile: Chester Loca ...
. Two of Gruffudd's sons, Llywelyn and Madoc, quickly made peace with Edward. However, their surrender documents state the need to recapture Dinas Brân proving that the fortification was not under Madoc's control.
Henry de Lacy, Earl of Lincoln Henry de Lacy, Earl of Lincoln (c. 1251February 1311), Baron of Pontefract, Lord of Bowland, Baron of Halton and hereditary Constable of Chester, was an English nobleman and confidant of King Edward I. He served Edward in Wales, France, and S ...
was sent with forces from
Oswestry Oswestry ( ; ) is a market town, civil parish and historic railway town in Shropshire, England, close to the Welsh border. It is at the junction of the A5, A483 and A495 roads. The town was the administrative headquarters of the Borough ...
to capture Dinas Brân. As soon as he had arrived he was told that the defenders of the castle, probably the younger brothers Owain and Gruffudd - who were still allies of Llywelyn Prince of Wales, had abandoned the castle and set it alight. The reason for this action is not clear but it may be that they had no confidence that they could defend the castle so did not want to let it fall intact to the English or their elder brother. Despite the fire, the castle was not badly damaged. The Earl of Lincoln recommended to Edward that the castle be repaired and garrisoned. The castle was occupied by the English till at least the Treaty of Aberconwy when Llywelyn sued for peace and ordered some repair work be undertaken. When the war restarted in 1282, the history of the castle is not recorded. It may have been recaptured by the Welsh like many other castles in the early months of the war, but ultimately it fell to the English. After Madoc died: the three surviving brothers all fought for Llywelyn. Following the end of the war in October 1282 and the death of Llywelyn, most of Powys Fadog including the castle was granted to John de Warenne, Earl of Surrey. Rather than rebuild Dinas Brân, De Warenne choose instead to build a new castle by the River Dee at
Holt Holt or holte may refer to: Natural world *Holt (den), an otter den * Holt, an area of woodland Places Australia * Holt, Australian Capital Territory * Division of Holt, an electoral district in the Australian House of Representatives in Vic ...
on the
Flintshire , settlement_type = County , image_skyline = , image_alt = , image_caption = , image_flag = , image_shield = Arms of Flint ...
-
Cheshire Cheshire ( ) is a ceremonial and historic county in North West England, bordered by Wales to the west, Merseyside and Greater Manchester to the north, Derbyshire to the east, and Staffordshire and Shropshire to the south. Cheshire's county tow ...
border. Dinas Brân was left to fall into ruin.


Later History

Castell Dinas Brân has also been a source of inspiration for artists in more recent centuries, such as
J. M. W. Turner Joseph Mallord William Turner (23 April 177519 December 1851), known in his time as William Turner, was an English Romantic painter, printmaker and watercolourist. He is known for his expressive colouring, imaginative landscapes and turbul ...
and Richard Wilson, both of whom strove to capture the castle and its surroundings through their paintings.


Layout

Dinas Brân has rectangular stone
defensive wall A defensive wall is a fortification usually used to protect a city, town or other settlement from potential aggressors. The walls can range from simple palisades or earthworks to extensive military fortifications with towers, bastions and gates ...
s with the longer sides running in an east-west direction. The northern wall is defended with the steep natural slope that falls sharply downwards for several hundred feet. The walls on the gentler slopes on the southern and eastern sides are strengthened with an additional deep rock-cut ditch and counterscarp bank. At the south-eastern corner where the ditch is at its deepest stood the
keep A keep (from the Middle English ''kype'') is a type of fortified tower built within castles during the Middle Ages by European nobility. Scholars have debated the scope of the word ''keep'', but usually consider it to refer to large towers in c ...
, which looks out onto a relatively easy approach to the castle from the River Dee. The two-storey structure00 would have been the strongest part of the castle, with its own defended approach through a narrow passage. Adjacent to the keep at the north eastern corner is a
gatehouse A gatehouse is a type of fortified gateway, an entry control point building, enclosing or accompanying a gateway for a town, religious house, castle, manor house, or other fortification building of importance. Gatehouses are typically the mo ...
, which was originally approached by a wooden bridge spanning the ditch. There is however almost no evidence remaining of the bridge and its supporting structure so that the exact configuration remains unclear. The bridge was also overlooked by the keep which allowed archers stationed there to guard the entrance. The Gatehouse had two towers either side of a decorated covered passageway into the castle courtyard. The
Great Hall A great hall is the main room of a royal palace, castle or a large manor house or hall house in the Middle Ages, and continued to be built in the country houses of the 16th and early 17th centuries, although by then the family used the gr ...
is sited on the castle's southern side, where some of the more visible remains still stand. This was a large room used for dining and receiving visitors. Its much enlarged windows still look south across the valley and an arched gateway leads from the west end of the room to what was once the Kitchens in the basement of the adjacent apsidal ('D' shaped) tower. This tower, called the Welsh Tower, is a typical feature of Welsh castles of the period. It would have protruded from the castle wall into the defensive ditch and provided archers with a clear view of any attackers attempting to approach the southern wall. The tower had perhaps three storeys with living quarters on the upper floors. In the south western corner was a
Postern A postern is a secondary door or gate in a fortification such as a city wall or castle curtain wall. Posterns were often located in a concealed location which allowed the occupants to come and go inconspicuously. In the event of a siege, a postern ...
gate. This was an additional exit from the castle, designed to be used in times of siege to allow the garrison to 'sally' out and attack their besiegers. Fragments of the arch remain as well as the slot for the door's drawbar. Originally, in the enclosed area of the castle there would have been stables, workshops, storage buildings and maybe a
chapel A chapel is a Christian place of prayer and worship that is usually relatively small. The term has several meanings. Firstly, smaller spaces inside a church that have their own altar are often called chapels; the Lady chapel is a common type ...
but as these were built of wood nothing remains above ground level. In the 19th century there was a local tradition, recorded by Walter Hawken Tregellas, that at Tower Farm, about a mile from the castle, had formerly stood a tower that was an outwork of the castle defences.


Legends and literature

Whilst the historical record for Dinas Brân is sparse, there are many myths and legends associated with the ancient site. The popular Welsh song ' Myfanwy' was composed by Joseph Parry and first published in 1875. Parry wrote the music to lyrics written by Richard Davies ('Mynyddog'; 1833–77). The lyrics were probably inspired by the fourteenth-century love-story of Myfanwy Fychan of Castell Dinas Brân, and the poet Hywel ab Einion. That story was also the subject of the popular poem, 'Myfanwy Fychan' (1858), by John Ceiriog Hughes (1832–87) and of Felicia Hemans's poem 'Howel's Song', set to music by John Parry in his 'Welsh Melodies' (1822). The castle first literary appearance is in a 12th-century historical document entitled "Fouke le Fitz Waryn," or "The Romance of Fulk Fitzwarine." In this tale the castle, named "Chastiel Bran," is referred to as a ruin during the early years of the Norman Conquest. The tale continues to tell of an arrogant Norman knight, Payn Peveril, who hears that no one has had courage enough to stay overnight inside the castle ruins, for fear of evil spirits. Payn and 15 'knightly followers' determine to stay the night. A storm blows up and an evil, mace-wielding giant called Gogmagog, appears. Payn defends his men against the attacks of the giant with his shield and cross, then stabs Gogmagog with his sword. As the giant is dying he tells of the earlier bravery of King Brân who had built the castle to try to defeat the giant. Despite King Brân's attempts against Gogmagog the King had been forced to flee and since then the giant had terrorised all the land around for many years. The giant also tells of a great treasury of idols buried at Dinas Brân which includes swans, peacocks, horses and a huge golden ox but dies without revealing its location.


Preservation

The castle is a scheduled ancient monument owned and maintained by
Denbighshire Denbighshire ( ; cy, Sir Ddinbych; ) is a county in the north-east of Wales. Its borders differ from the historic county of the same name. This part of Wales contains the country's oldest known evidence of habitation – Pontnewydd (Bontnewy ...
council with the assistance of
Cadw (, a Welsh verbal noun meaning "keeping/preserving") is the historic environment service of the Welsh Government and part of the Tourism and Culture group. works to protect the historic buildings and structures, the landscapes and heritage ...
. It is open all year round for visitors. Due to the exposed steep routes up to the castle, official advice suggests stout walking shoes and warm, waterproof clothing.


Geology

The conspicuous hill upon which Dinas Brân was built reaches an elevation of 321.4m / 1054 ft Amsl and is composed of thinly bedded, uncleaved, late
Silurian The Silurian ( ) is a geologic period and system spanning 24.6 million years from the end of the Ordovician Period, at million years ago ( Mya), to the beginning of the Devonian Period, Mya. The Silurian is the shortest period of the Paleoz ...
deep water marine
silt Silt is granular material of a size between sand and clay and composed mostly of broken grains of quartz. Silt may occur as a soil (often mixed with sand or clay) or as sediment mixed in suspension with water. Silt usually has a floury feel ...
y
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 of the Dinas Brân
Geological Formation A geological formation, or simply formation, is a body of rock having a consistent set of physical characteristics ( lithology) that distinguishes it from adjacent bodies of rock, and which occupies a particular position in the layers of rock exp ...
(formerly the Dinas Brân Group or Dinas Brân Beds). At up to 225m in thickness, the Dinas Brân Formation is thought to range upwards in age into the late
Ludfordian In the geologic timescale, the Ludfordian is the upper of two chronostratigraphic stages within the Ludlow Series. Its age is the late Silurian Period, and within both the Palaeozoic Era and Phanerozoic Eon. The rocks assigned to the Ludfordian ...
Stage, the upper of two
chronostratigraphic Chronostratigraphy is the branch of stratigraphy that studies the ages of rock strata in relation to time. The ultimate aim of chronostratigraphy is to arrange the sequence of deposition and the time of deposition of all rocks within a geologi ...
subdivisions within the
Ludlow epoch In the geological timescale, the Ludlow Epoch (from 427.4 ± 0.5 million years ago to 423.0 ± 2.3 million years ago) occurred during the Silurian Period, after the end of the Homerian Age. It is named for the town of Ludlow in Shropshire, Englan ...
(427.4 ± 0.5 million years to 423.0 ± 2.3 million years ago in duration). Geographically, the mudstones and
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, ...
s extend from the type exposures around Dinas Brân to the
Pontcysyllte The Pontcysyllte Aqueduct (; cy, Traphont Ddŵr Pontcysyllte) is a navigable aqueduct that carries the Llangollen Canal across the River Dee in the Vale of Llangollen in northeast Wales. The 18-arched stone and cast iron structure is for use ...
Aqueduct about 4.1 miles (6.6 km) to the east. The formation occupies the core of the Llangollen
syncline In structural geology, a syncline is a fold with younger layers closer to the center of the structure, whereas an anticline is the inverse of a syncline. A synclinorium (plural synclinoriums or synclinoria) is a large syncline with superimpose ...
and, although the basal junction is not seen, it overlies the Vivod Group (or ''
Monograptus ''Monograptus'' is a genus of graptolites in the Order Graptoloidea. This particular genus is the last stage of the graptoloid evolution before its extinction in the early Devonian. A characteristic of the genus includes one uniserial stipes ...
leintwardinensis'' Beds) of Wills and Smith (1922) which also consist of thinly bedded flaggy mudstones. Upper junction of the Dinas Brân Formation is likewise not exposed, but opposite the (Llangollen - Panorama Walk) Wern road T-junction at the base of the Eglwyseg
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 ...
is a very small
outcrop An outcrop or rocky outcrop is a visible exposure of bedrock or ancient superficial deposits on the surface of the Earth. Features Outcrops do not cover the majority of the Earth's land surface because in most places the bedrock or superficia ...
of dark olive-grey mudstone with abundant remains of the
brachiopod Brachiopods (), phylum Brachiopoda, are a phylum of trochozoan animals that have hard "valves" (shells) on the upper and lower surfaces, unlike the left and right arrangement in bivalve molluscs. Brachiopod valves are hinged at the rear end, w ...
''Dayia navicula'' (J. de C. Sowerby, 1839).SOWERBY, J. de C. ''In'' MURCHISON, R. I. 1839. The Silurian System. London. 768 pp., 37 pls. p. 621 This exposure is
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 ...
overlain by fossiliferous Lower Carboniferous Limestone of the Clwyd Limestone Group (deposited between 363 and 325 million years ago) that forms the impressive escarpment, but once again the actual junction is obscured by a combination of
scree Scree is a collection of broken rock fragments at the base of a cliff or other steep rocky mass that has accumulated through periodic rockfall. Landforms associated with these materials are often called talus deposits. Talus deposits typically ...
,
regolith Regolith () is a blanket of unconsolidated, loose, heterogeneous superficial deposits covering solid rock. It includes dust, broken rocks, and other related materials and is present on Earth, the Moon, Mars, some asteroids, and other terrestr ...
and common
gorse ''Ulex'' (commonly known as gorse, furze, or whin) is a genus of flowering plants in the family Fabaceae. The genus comprises about 20 species of thorny evergreen shrubs in the subfamily Faboideae of the pea family Fabaceae. The species are ...
(''
Ulex europaeus ''Ulex europaeus'', the gorse, common gorse, furze or whin, is a species of flowering plant in the family Fabaceae, native to the British Isles and Western Europe. Description Growing to tall, it is an evergreen shrub. The young stems are g ...
''). Silurian fossils can also be observed in scree and rubble below the castle on the steep northern slope and in the deep rock-cut ditches partially surrounding the ruin, which served the dual purpose of both defense and quarrying stone to build Dinas Brân.
Orthocone An orthocone is an unusually long straight shell of a nautiloid cephalopod.; During the 18th and 19th centuries, all shells of this type were named '' Orthoceras'', creating a wastebasket taxon, but it is now known that many groups of nautiloi ...
straight-shelled
Nautiloid Nautiloids are a group of marine cephalopods (Mollusca) which originated in the Late Cambrian and are represented today by the living ''Nautilus'' and '' Allonautilus''. Fossil nautiloids are diverse and speciose, with over 2,500 recorded specie ...
s (Molluscan Class
Cephalopod A cephalopod is any member of the molluscan class Cephalopoda ( Greek plural , ; "head-feet") such as a squid, octopus, cuttlefish, or nautilus. These exclusively marine animals are characterized by bilateral body symmetry, a prominent head ...
a), various brachiopod species and rare
Trilobite Trilobites (; meaning "three lobes") are extinct marine arthropods that form the class Trilobita. Trilobites form one of the earliest-known groups of arthropods. The first appearance of trilobites in the fossil record defines the base of the ...
remains may also be found.


See also

* List of hillforts in Wales * List of castles in Wales


Notes

;Citations ;Bibliography * * * * * * * * ;Further reading * *


External links


Clwyd Powys Archaeological Trust

megalithic.co.uk

3D model of the standing remains
{{DEFAULTSORT:Castell Dinas Bran Llangollen
Dinas Bran Dinas may refer to: Places England * Dinas, an area of Padstow, Cornwall * Castle an Dinas, St Columb Major, an Iron Age hillfort at the summit of Castle Downs, Cornwall * Treryn Dinas, a headland near Treen, on the Penwith peninsula, Cornwa ...
Hillforts in Denbighshire Geology of Wales