|
Gaer (Black Mountains)
Gaer is the name of a hill in the Black Mountains of the Brecon Beacons National Park in Monmouthshire, south Wales. It lies at the southern end of the long ridge between the valley of the Grwyne Fawr and the Vale of Ewyas one mile to the north of Bryn Arw and 3 miles northeast of Sugarloaf. Its summit at 427m above sea level sits within an Iron Age hillfort known as Twyn y Gaer. Geology The mass of the hill is formed from the mudstones and sandstones of the Senni Beds formation whilst the upper slopes are formed from the sandstones of the overlying Brownstones Formation. Both are assigned to the Old Red Sandstone which was laid down during the Devonian period. The southern slopes around Coed y Cerrig have been the subject of substantial landslipping in the past.British Geological Survey 1:50,000 map sheet 214 'Talgarth' & accompanying sheet explanation Access The upper part of the hill is designated as open country so freely accessible to walkers. Several public footpaths ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Twyn Y Gaer Iron Age Hill Fort, Situated Atop The Gaer Mountain, S
{{disambiguation, surname ...
Twinn may refer to: * Ian Twinn (born 1950), British Conservative politician * Peter Twinn (1916–2004), British mathematician, World War II codebreaker and entomologist * Schwinn Twinn, a tandem bicycle * Walter Patrick Twinn (1934–1997), Canadian Chief of the Sawridge First Nation See also * Twin (other) * Twinning (other) Twinning (making a twin of) may refer to: * In biology and agriculture, producing two offspring (i.e., twins) at a time, or having a tendency to do so; * Twin towns and sister cities, towns and cities involved in town twinning * Twinning instit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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-Roman period. The fortification usually follows the contours of a hill and consists of one or more lines of earthworks, with stockades or defensive walls, and external ditches. Hillforts developed in the Late Bronze and Early Iron Age, roughly the start of the first millennium BC, and were used in many Celtic areas of central and western Europe until the Roman conquest. Nomenclature The spellings "hill fort", "hill-fort" and "hillfort" are all used in the archaeological literature. The ''Monument Type Thesaurus'' published by the Forum on Information Standards in Heritage lists ''hillfort'' as the preferred term. They all refer to an elevated site with one or more ramparts made of earth, stone and/or wood, with an external ditch. Many ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hillforts In Monmouthshire
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-Roman period. The fortification usually follows the contours of a hill and consists of one or more lines of earthworks, with stockades or defensive walls, and external ditches. Hillforts developed in the Late Bronze and Early Iron Age, roughly the start of the first millennium BC, and were used in many Celtic areas of central and western Europe until the Roman conquest. Nomenclature The spellings "hill fort", "hill-fort" and "hillfort" are all used in the archaeological literature. The ''Monument Type Thesaurus'' published by the Forum on Information Standards in Heritage lists ''hillfort'' as the preferred term. They all refer to an elevated site with one or more ramparts made of earth, stone and/or wood, with an external ditch. Many ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mountains And Hills Of Monmouthshire
A mountain is an elevated portion of the Earth's crust, generally with steep sides that show significant exposed bedrock. Although definitions vary, a mountain may differ from a plateau in having a limited summit area, and is usually higher than a hill, typically rising at least 300 metres (1,000 feet) above the surrounding land. A few mountains are isolated summits, but most occur in mountain ranges. Mountains are formed through tectonic forces, erosion, or volcanism, which act on time scales of up to tens of millions of years. Once mountain building ceases, mountains are slowly leveled through the action of weathering, through slumping and other forms of mass wasting, as well as through erosion by rivers and glaciers. High elevations on mountains produce colder climates than at sea level at similar latitude. These colder climates strongly affect the ecosystems of mountains: different elevations have different plants and animals. Because of the less hospitable terrain and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Hillforts In Wales
This is a list of hillforts in Wales. Anglesey *Bwrdd Arthur, Din Sylwy (Bwrdd Arthur) (), contour fort *Caer Idris Hillfort (), promontory fort *Caer y Twr (), partial contour fort *Dinas Gynfor (), promontory fort *Dinas Porth Ruffydd (), promontory fort *Mynydd Llwydiarth (Anglesey), Mynydd Llwydiarth (), promontory fort *Parciau hill fort (), promontory fort *Tan-y-graig, Llanffinan (), contour fort *Twyn-y-Parc (), promontory fort *Y Werthyr hillfort (), marsh fort *Y Werthyr, Llanddeusant (), contour fort *Ynys-y-Fydlyn (), promontory fort Bridgend County Borough *Cae Summerhouse Camp (), partial contour fort *Chapel Hill Camp, Merthyr Mawr House (), contour fort *Coed-y-Mwstwr (), contour fort *Cwm Llwyd (), partial contour fort *Mynydd Twmpathyddaer (), contour fort *Mynydd y Gaer hillfort, Mynydd y Gaer (), partial contour fort *Pen y Castell, Kenfig Hill (), contour fort *Y Bwlwarcau (), multiple enclosure hillfort *Y Bwlwarcau, Eastern Enclosure (), hillslope fort ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Landslip
Landslides, also known as landslips, are several forms of mass wasting that may include a wide range of ground movements, such as rockfalls, deep-seated slope failures, mudflows, and debris flows. Landslides occur in a variety of environments, characterized by either steep or gentle slope gradients, from mountain ranges to coastal cliffs or even underwater, in which case they are called submarine landslides. Gravity is the primary driving force for a landslide to occur, but there are other factors affecting slope stability that produce specific conditions that make a slope prone to failure. In many cases, the landslide is triggered by a specific event (such as a heavy rainfall, an earthquake, a slope cut to build a road, and many others), although this is not always identifiable. Causes Landslides occur when the slope (or a portion of it) undergoes some processes that change its condition from stable to unstable. This is essentially due to a decrease in the shear strength of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Devonian Period
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, where rocks from this period were first studied. The first significant adaptive radiation of life on dry land occurred during the Devonian. Free-sporing vascular plants began to spread across dry land, forming extensive forests which covered the continents. By the middle of the Devonian, several groups of plants had evolved leaves and true roots, and by the end of the period the first seed-bearing plants appeared. The arthropod groups of myriapods, arachnids and hexapods also became well-established early in this period, after starting their expansion to land at least from the Ordovician period. Fish reached substantial diversity during this time, leading the Devonian to often be dubbed the Age of Fishes. The placoderms began dominating ... [...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] |
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 applied to Iron Age Europe and the Ancient Near East, but also, by analogy, to other parts of the Old World. The duration of the Iron Age varies depending on the region under consideration. It is defined by archaeological convention. The "Iron Age" begins locally when the production of iron or steel has advanced to the point where iron tools and weapons replace their bronze equivalents in common use. In the Ancient Near East, this transition took place in the wake of the Bronze Age collapse, in the 12th century BC. The technology soon spread throughout the Mediterranean Basin region and to South Asia (Iron Age in India) between the 12th and 11th century BC. Its further spread to Central Asia, Eastern Europe, and Central Europe is somewhat dela ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Black Mountains, Wales
The Black Mountains ( cy, Y Mynydd Du or sometimes ) are a group of hills spread across parts of Powys and Monmouthshire in southeast Wales, and extending across the England–Wales border into Herefordshire. They are the easternmost of the four ranges of hills that comprise the Brecon Beacons National Park, and are frequently confused with the westernmost, which is known as the Black Mountain. The Black Mountains may be roughly defined as those hills contained within a triangle defined by the towns of Abergavenny in the southeast, Hay-on-Wye in the north and the village of Llangors in the west. Other gateway towns to the Black Mountains include Talgarth and Crickhowell. The range of hills is well known to walkers and ramblers for the ease of access and views from the many ridge trails, such as that on the Black Hill (Herefordshire) at the eastern edge of the massif. The range includes the highest public road in Wales at Gospel Pass, and the highest point in southern England ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sugarloaf Mountain
Sugarloaf Mountain ( pt, Pão de Açúcar, ) is a peak situated in Rio de Janeiro, Brazil, at the mouth of Guanabara Bay on a peninsula that juts out into the Atlantic Ocean. Rising above the harbor, the peak is named for its resemblance to the traditional shape of concentrated refined loaf sugar. It is known worldwide for its cableway and panoramic views of the city and beyond. The mountain is one of several monolithic granite and quartz mountains that rise straight from the water's edge around Rio de Janeiro. Geologically, it is considered part of a family of steep-sided rock outcroppings known as non-inselberg bornhardts. The mountain is protected by the Sugarloaf Mountain and Urca Hill Natural Monument, created in 2006. This became part of a World Heritage Site declared by UNESCO in 2012. Origins of the name The name Sugarloaf was coined in the 16th century by the Portuguese during the heyday of sugarcane trade in Brazil. According to historian Vieira Fazenda, bloc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bryn Arw
Bryn Arw is a hill in the Black Mountains, Wales, Black Mountains of the Brecon Beacons National Park in Monmouthshire, south Wales. It lies 4 km north of the town of Abergavenny and 1.5 miles west of the village of Llanvihangel Crucorney. Its summit at 384m (1260 feet) above sea level is the more northerly of two tops which lie on the crest of a slightly arcuate north-south ridge which drops away to the south at first gently and then sharply. The hill is isolated from the main mass of the range by the valleys of Cwm Coed-y-cerig to the north and by Cwm Brynarw to the west. It is a Marilyn (hill), Marilyn. Geology The hill is composed from mudstones and sandstones of the Senni Beds Formation of the Old Red Sandstone laid down during the Devonian period. A number of small fossil landslips can be seen around its flanks, notably at its northwestern and southwestern points where the slopes are steepest.British Geological Survey 1:50,000 map sheets 214 'Talgarth' and '232 'Aberga ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
