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Edmunds Tump
Graig Syfyrddin or just ''The Graig'', is a 423m high hill near Grosmont in north-eastern Monmouthshire, Wales. The summit knoll is known as ''Edmund's Tump''. The hill consists of an isolated mass of the micaceous sandstones of the Brownstones Formation, a unit of the Old Red Sandstone well known from the nearby Black Mountains, of which it can be considered an outlier in both the geographical and geological sense. The Three Castles Walk, a waymarked recreational walk in Monmouthshire linking Grosmont Castle, White Castle (Wales) and Skenfrith Castle Skenfrith Castle ( cy, Castell Ynysgynwraidd) is a ruined castle in the village of Skenfrith in Monmouthshire, Wales. The fortification was established by the Normans in the wake of the invasion of England in 1066, to protect the route from Wa ... passes over the hill. References External links www.geograph.co.uk : photos of Graig Syfyrddin and surrounding area Marilyns of Wales Mountains and hills of Monmouthshire [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ysgyryd Fawr
Ysgyryd Fawr ( en, Skirrid) is an easterly outlier of the Black Mountains in Wales, and forms the easternmost part of the Brecon Beacons National Park. The hill is often referred to locally as just The Skirrid. The smaller hill of Ysgyryd Fach or "Little Skirrid" (270m) lies about 4.5 km / 2.5 mi to the south. It is 486 m or 1594 feet high and lies just to the north-east of Abergavenny, Monmouthshire, about 10 miles from the English border. The Beacons Way passes along the ridge. Geology The distinctive shape of this Old Red Sandstone hill comprises a long ridge oriented nearly north–south, with a jagged western side resulting from ice age landslips . The upper slopes of the hill are composed of Devonian age sandstones assigned to the Senni Formation (formerly known as the "Senni Beds"). These overlie weaker mudstones of the St Maughans Formation - a situation which has contributed to the instability of the hill's steep flanks, resulting in a very la ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marilyn (hill)
This is a list of Marilyn hills and mountains in the United Kingdom, Isle of Man and Republic of Ireland, Ireland by height. Lists of mountains and hills in the British Isles#Marilyns, Marilyns are defined as peaks with a topographic prominence, prominence of or more, regardless of height or any other merit (e.g. topographic isolation, as used in Lists of mountains and hills in the British Isles#Munros, Munros). Thus, Marilyns can be mountains, with a height above , or relatively small hills. there were 2,011 recorded Marilyns. Definition The Marilyn classification was created by Alan Dawson in his 1992 book ''The Relative Hills of Britain''. The name Marilyn was coined by Dawson as a punning contrast to the ''Munro'' classification of Scottish mountains above , but which has no explicit prominence threshold, being homophonous with (Marilyn) ''Marilyn Monroe, Monroe''. The list of Marilyns was extended to Ireland by Clem Clements. Marilyn was the first of several subsequen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monmouthshire
Monmouthshire ( cy, Sir Fynwy) is a county in the south-east of Wales. The name derives from the historic county of the same name; the modern county covers the eastern three-fifths of the historic county. The largest town is Abergavenny, with other towns and large villages being: Caldicot, Chepstow, Monmouth, Magor and Usk. It borders Torfaen, Newport and Blaenau Gwent to the west; Herefordshire and Gloucestershire to the east; and Powys to the north. Historic county The historic county of Monmouthshire was formed from the Welsh Marches by the Laws in Wales Act 1535 bordering Gloucestershire to the east, Herefordshire to the northeast, Brecknockshire to the north, and Glamorgan to the west. The Laws in Wales Act 1542 enumerated the counties of Wales and omitted Monmouthshire, implying that the county was no longer to be treated as part of Wales. However, for all purposes Wales had become part of the Kingdom of England, and the difference had little practical effect. F ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wales
Wales ( cy, Cymru ) is a Countries of the United Kingdom, country that is part of the United Kingdom. It is bordered by England to the Wales–England border, 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 2021 of 3,107,500 and has a total area of . Wales has over of coastline and is largely mountainous with its higher peaks in the north and central areas, including Snowdon (), its highest summit. The country lies within the Temperateness, north temperate zone and has a changeable, maritime climate. The capital and largest city is Cardiff. Welsh national identity emerged among the Celtic Britons after the Roman withdrawal from Britain in the 5th century, and Wales was formed as a Kingdom of Wales, kingdom under Gruffydd ap Llywelyn in 1055. Wales is regarded as one of the Celtic nations. The Conquest of Wales by Edward I, conquest of Wales by Edward I of England was completed by 1283, th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brecon Beacons
The Brecon Beacons ( cy, Bannau Brycheiniog, ) are a mountain range in South Wales. In a narrow sense, the name refers to the range of Old Red Sandstone peaks which lie to the south of Brecon. Sometimes referred to as "the central Beacons" they include South Wales' highest mountain, Pen y Fan. The range forms the central section of the Brecon Beacons National Park (), a designation which also encompasses ranges both to the east and the west of "the central Beacons". This much wider area is also commonly referred to as "the Brecon Beacons", and it includes the Black Mountains to the east as well as the similarly named but quite distinct Black Mountain to the west. The highest peaks include Fan Brycheiniog to the west and Pen y Fan in the central part. They share the same basic geology as the central range, and so exhibit many similar features, such as the north-facing escarpment and glacial features such as lakes and cwms ( cirques). Geography The Brecon Beacons range, in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grosmont, Monmouthshire
Grosmont ( cy, Y Grysmwnt or ''Rhosllwyn'') is a village and community near Abergavenny in Monmouthshire, Wales. The population taken at the 2011 census was 920. The wider community (parish) includes the villages of Llangattock Lingoed, Llangua and Llanvetherine. History There are circumstantial indications that Grosmont may have originated as an Iron Age camp. Grosmont Castle Grosmont Castle, along with the nearby White Castle and Skenfrith Castle, have given rise to the Three Castles Walk which links the castles and along with the Monnow Valley Walk brings visitors to the village. Grosmont is dominated by the nearby Graig Syfyrddin (or Edmunds Tump, possibly after Edmund Crouchback, 1st Earl of Lancaster). The castle itself was established by the Normans in the wake of the invasion of England in 1066. It was the birthplace of Henry, 1st Duke of Lancaster. Formation of the borough Grosmont was once an important medieval township. It was granted a borough charter, p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mica
Micas ( ) are a group of silicate minerals whose outstanding physical characteristic is that individual mica crystals can easily be split into extremely thin elastic plates. This characteristic is described as perfect basal cleavage. Mica is common in igneous and metamorphic rock and is occasionally found as small flakes in sedimentary rock. It is particularly prominent in many granites, pegmatites, and schists, and "books" (large individual crystals) of mica several feet across have been found in some pegmatites. Micas are used in products such as drywalls, paints, fillers, especially in parts for automobiles, roofing and shingles, as well as in electronics. The mineral is used in cosmetics and food to add "shimmer" or "frost." Properties and structure The mica group is composed of 37 phyllosilicate minerals. All crystallize in the monoclinic system, with a tendency towards pseudohexagonal crystals, and are similar in structure but vary in chemical composition. Micas are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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) because they are the most resistant minerals to weathering processes at the Earth's surface. Like uncemented sand, sandstone may be any color due to impurities within the minerals, but the most common colors are tan, brown, yellow, red, grey, pink, white, and black. Since sandstone beds often form highly visible cliffs and other topographic features, certain colors of sandstone have been strongly identified with certain regions. Rock formations that are primarily composed of sandstone usually allow the percolation of water and other fluids and are porous enough to store large quantities, making them valuable aquifers and petroleum reservoirs. Quartz-bearing sandstone can be changed into quartzite through metamorphism, usually related to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 extends northwards into Greenland and Svalbard. These areas were a part of the ancient continent of Euramerica, Euramerica/Laurussia. In Britain it is a lithostratigraphy, lithostratigraphic unit (a sequence of rock strata) to which Stratigraphy, stratigraphers accord Geological unit#Lithostratigraphic units, supergroup status and which is of considerable importance to early paleontology. For convenience the short version of the term, ORS is often used in literature on the subject. The term was coined to distinguish the sequence from the younger New Red Sandstone which also occurs widely throughout Britain. Sedimentology The Old Red Sandstone describes a suite of sedimentary rocks deposited in a variety of environments during the Devonian ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Inliers And Outliers (geology)
An inlier is an area of older rocks surrounded by younger rocks. Inliers are typically formed by the erosion of overlying younger rocks to reveal a limited exposure of the older underlying rocks. Faulting or folding may also contribute to the observed outcrop pattern. A classic example from Great Britain is that of the inlier of folded Ordovician and Silurian rocks at Horton in Ribblesdale in North Yorkshire which are surrounded by the younger flat-lying Carboniferous Limestone. The location has long been visited by geology students and experts. Another example from South Wales is the Usk Inlier in Monmouthshire where Silurian age rocks are upfolded amidst Old Red Sandstone rocks of Devonian age. A similar outcrop pattern which results from movement on a thrust fault followed by erosion may be termed a window. Conversely an outlier is an area of younger rock surrounded by older rocks. An outlier is typically formed when sufficient erosion of surrounding rocks has taken place to s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Three Castles Walk Monmouthshire
The Three Castles Walk is a waymarked long distance footpath and recreational walk located in north-east Monmouthshire, Wales. Distance The Three Castles Walk covers on a circular route. Route The route links Skenfrith Castle Grosmont Castle and White Castle It follows woods and hills and takes the walker over Graig Syfyrddin (Edmunds Tump), from which there are views of the Welsh Marches, the mountains of South Wales, including the Black Mountains, and the Forest of Dean and beyond. The Three Castles Walk links with both the Offa's Dyke Path (at White Castle) and the Monnow Valley Walk Monnow Valley Walk is a long-distance footpath in north-east Monmouthshire, South Wales, with short sections in Herefordshire, England and Powys. It links Monmouth and Hay-on-Wye, following the River Monnow and the foot of the Black Mountains ... (at Skenfrith and Grosmont). References External links Official Monmouthshire County Council information on the walk [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grosmont Castle
Grosmont Castle is a ruined castle in the village of Grosmont, Monmouthshire, Wales. The fortification was established by the Normans in the wake of the invasion of England in 1066, to protect the route from Wales to Hereford. Possibly commissioned by William fitz Osbern, the Earl of Hereford, it was originally an earthwork design with timber defences. In 1135, a major Welsh revolt took place, and in response King Stephen brought together Grosmont Castle and its sister fortifications of Skenfrith and White Castle to form a lordship known as the "Three Castles", which continued to play a role in defending the region from Welsh attack for several centuries. King John gave the castle to a powerful royal official, Hubert de Burgh, in 1201. During the course of the next few decades it passed back and forth between several owners, including Hubert, the rival de Braose family, and the Crown. Hubert rebuilt the castle in stone, beginning with a new hall and then, on regaining the p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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