Cribyn () is a mountain in the

Brecon Beacons The Brecon Beacons (; ) are a mountain range in Wales. The range includes South Wales's highest mountain, Pen y Fan (), its twin summit Corn Du (), and Craig Gwaun Taf (), which are the three highest peaks in the range. The Brecon Beacons ha ...

(Bannau Brycheiniog) with an elevation of 2608 feet (or 795 metres), about 300 feet lower than the neighbouring peaks of

Pen y Fan Pen y Fan () is the highest peak in South Wales, situated in Brecon Beacons National Park (Bannau Brycheiniog). At above sea-level, it is also the highest British peak south of Cadair Idris in Snowdonia. It is the highest point (List of countie ...

and

Corn Du Corn Du is a summit of the twin topped Pen y Fan and the second highest peak in South Wales at 871.5 m (2,864 ft), situated in the Brecon Beacons National Park. It is situated to the south-west of Pen y Fan at a distance of approximate ...

. It is a prominent peak in the long and impressive

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 ...

facing north and running roughly east–west of the central section of the Brecon Beacons. The summit lies on a ridge stretching from

Talybont Reservoir Talybont Reservoir () is the largest stillwater reservoir in the central Brecon Beacons at . Talybont-on-Usk is downstream of the dam. Construction of the current dam started in 1931 by Newport City Council, Newport Corporation, and in 1939 th ...

in the east, to the

A470 road The A470 (also named the Cardiff to Glan Conwy Trunk Road) is a trunk road in Wales. It is the country's longest road at and links the capital Cardiff on the south coast to Llandudno on the north coast. While previously one had to navigate th ...

. The ridge line to the west connects Cribyn with the peak of Pen y Fan. To the east, the ridge line descends to Bwlch ar y Fan, a

col A col is the lowest point on a mountain ridge between two peaks; a mountain pass or saddle. COL, CoL or col may also refer to: Computers * Caldera OpenLinux, a defunct Linux distribution * , an HTML element specifying a column * A collision sig ...

crossed by an ancient trail sometimes known as 'The Gap Road' before ascending again to the peak of Fan y Big.

Geology

Cribyn and the top of Cwm Sere - geograph

In common with other peaks of the Brecon Beacons, the upper slopes of Cribyn are formed from

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 ...

s of the Brownstones Formation of 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 ...

laid down during the

Devonian period The Devonian ( ) is a geologic period and system of the Paleozoic era during the Phanerozoic eon, spanning 60.3 million years from the end of the preceding Silurian period at million years ago ( Ma), to the beginning of the succeeding C ...

. The lower slopes of the hill are formed from sandstones and

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 of the underlying

Senni Beds Senni may refer to: *Lorenzo Senni (born 1983), Italian musician and visual artist *Manuel Senni (born 1992), Italian cyclist *Afon Senni, a river in Wales {{disambiguation, surname ...

Formation. The

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

tilt gently southward like the rest of the peaks in the range. The heads of Cwm Sere and Cwm Cynwyn, to the northwest and east of Cribyn respectively, nurtured small glaciers during the last

ice age An ice age is a long period of reduction in the temperature of Earth's surface and atmosphere, resulting in the presence or expansion of continental and polar ice sheets and alpine glaciers. Earth's climate alternates between ice ages, and g ...

and there are rock

moraine A moraine is any accumulation of unconsolidated debris (regolith and Rock (geology), rock), sometimes referred to as glacial till, that occurs in both currently and formerly glaciated regions, and that has been previously carried along by a gla ...

s at the foot of the cliffs. The

glacial erosion Erosion is the action of surface processes (such as Surface runoff, water flow or wind) that removes soil, Rock (geology), rock, or dissolved material from one location on the Earth's crust#Crust, Earth's crust and then sediment transport, tran ...

resulted in the very steep northern and eastern faces which the hill possesses.

Access

Cribyn seen from Cefn Cwm Llwch - geograph

The

are classed as

open country "Open Country" is a designation used for some access land in England and Wales. It was first defined under the National Parks and Access to the Countryside Act 1949 (and extended by the Countryside Act 1968), and was land over which an appropr ...

, so the visitor can walk anywhere in the highland zone. Trails and footpaths are well marked, and owing to frequent use, are also well trodden. The

National Trust The National Trust () is a heritage and nature conservation charity and membership organisation in England, Wales and Northern Ireland. The Trust was founded in 1895 by Octavia Hill, Sir Robert Hunter and Hardwicke Rawnsley to "promote the ...

owns much of the land and the paths are well maintained and reinforced where wear and tear is heavy. The main paths are intensively used by individual walkers and groups, but also by the

British Army The British Army is the principal Army, land warfare force of the United Kingdom. the British Army comprises 73,847 regular full-time personnel, 4,127 Brigade of Gurkhas, Gurkhas, 25,742 Army Reserve (United Kingdom), volunteer reserve perso ...

for troop training, and by charity walks. The peak is adjacent to

so is often chosen for circular walks along the main

. When the weather is clear, the views to the north are especially impressive towards

Mynydd Epynt Mynydd Epynt () is an upland region of Mid Wales, within the county of Powys. It is bounded on the south by the upper stretch of the Usk Valley, on the north by the Irfon Valley, and on the east by the Wye Valley. Its western boundary is less ...

Brecon Brecon (; ; ), archaically known as Brecknock, is a market town in Powys, mid Wales. In 1841, it had a population of 5,701. The population in 2001 was 7,901, increasing to 8,250 at the 2011 census. Historically it was the county town of Breck ...

and the

Cambrian Mountains The Cambrian Mountains (, in a narrower sense: ''Elenydd'') are a series of mountain ranges in Wales. The term ''Cambrian Mountains'' used to apply to most of the upland of Wales, and comes from the country's Latin name . Since the 1950s, it ...

beyond.

Wildlife

Many mountain birds are present, such as

birds of prey Birds of prey or predatory birds, also known as (although not the same as) raptors, are hypercarnivorous bird species that actively predation, hunt and feed on other vertebrates (mainly mammals, reptiles and smaller birds). In addition to speed ...

peregrine falcon The peregrine falcon (''Falco peregrinus''), also known simply as the peregrine, is a Cosmopolitan distribution, cosmopolitan bird of prey (raptor) in the family (biology), family Falconidae renowned for its speed. A large, Corvus (genus), cro ...

common buzzard The common buzzard (''Buteo buteo'') is a medium-to-large bird of prey which has a large range. It is a member of the genus '' Buteo'' in the family Accipitridae. The species lives in most of Europe and extends its breeding range across much of ...

s and the

red kite The red kite (''Milvus milvus'') is a bird of prey in the family Accipitridae, which also includes many other Diurnality, diurnal Bird of prey, raptors such as eagles, buzzards, and harrier (bird), harriers. The species currently breeds only i ...

Raven A raven is any of several large-bodied passerine bird species in the genus '' Corvus''. These species do not form a single taxonomic group within the genus. There is no consistent distinction between crows and ravens; the two names are assigne ...

s can also be seen occasionally, and more often heard by their deep croak. They use

thermals A thermal column (or thermal) is a rising mass of buoyant air, a convective current in the atmosphere, that transfers heat energy vertically. Thermals are created by the uneven heating of Earth's surface from solar radiation, and are an example ...

in the valleys around the peaks to soar and search for food such as

mice A mouse (: mice) is a small rodent. Characteristically, mice are known to have a pointed snout, small rounded ears, a body-length scaly tail, and a high breeding rate. The best known mouse species is the common house mouse (''Mus musculus' ...

and

vole Voles are small rodents that are relatives of lemmings and hamsters, but with a stouter body; a longer, hairy tail; a slightly rounder head; smaller eyes and ears; and differently formed molars (high-crowned with angular cusps instead of lo ...

s. The lower parts of the

moorland Moorland or moor is a type of Habitat (ecology), habitat found in upland (geology), upland areas in temperate grasslands, savannas, and shrublands and the biomes of montane grasslands and shrublands, characterised by low-growing vegetation on So ...

adjacent to the peaks is used for nesting by

skylark ''Alauda'' is a genus of larks found across much of Europe, Asia and in the mountains of north Africa, and one of the species (the Raso lark) endemic to the islet of Raso in the Cape Verde Islands Cape Verde or Cabo Verde, officially ...

s as well as some

game bird Game or quarry is any wild animal hunted for animal products (primarily meat), for recreation (" sporting"), or for trophies. The species of animals hunted as game varies in different parts of the world and by different local jurisdictions, thou ...

s like

red grouse The red grouse (''Lagopus scotica'') is a medium-sized bird of the grouse family which is found in Calluna, heather moorland in Great Britain and Ireland. It was formerly classified as a subspecies of the willow ptarmigan (''Lagopus lagopus'') ...

and

partridges A partridge is a medium-sized galliform bird in any of several genera, with a wide native distribution throughout parts of Europe, Asia and Africa. Several species have been introduced to the Americas. They are sometimes grouped in the Perdic ...

. The skylark can frequently be seen soaring and heard singing above its nest.

References

External links

{{Commons category, Cribyn (mountain), Cribyn
www.geograph.co.uk : photos of Cribyn and surrounding area
Brecon Beacons Mountains and hills of Powys Hewitts of Wales Nuttalls