Gilwern Hill, Monmouthshire
Encyclopedia
Gilwern Hill is a 441m high hill in the Brecon Beacons National Park, south of the village of Gilwern
in Monmouthshire
, Wales
. It lies west of the Blorenge
. The hill is a Site of Special Scientific Interest
.
age, each of which dip moderately southwards. The summit plateau is formed from sandstone
s - the Farewell Rock
and the Twrch Sandstone which overlie the Carboniferous Limestone
. The latter has been extensively quarried around the eastern, northern and western margins of the hill where it is exposed. Derelict tramways are in evidence in connection with the working of these quarries for limestone in connection with iron and steel-smelting.
and so access is therefore available freely to walkers. A minor road wraps around its southern and western margins whilst a couple of public footpaths and a restricted byway cross the northern and eastern slopes of the hill. The quarries provide a minor venue for rock climbing
.
Gilwern
Gilwern is a village in Monmouthshire, Wales. The name is translated from the Welsh language as "the nook near the alder grove". It is within the Llanelly parish ward of Monmouthshire County Council, west of market town of Abergavenny.-Attractions:...
in Monmouthshire
Monmouthshire
Monmouthshire is a county in south east Wales. The name derives from the historic county of Monmouthshire which covered a much larger area. The largest town is Abergavenny. There are many castles in Monmouthshire .-Historic county:...
, Wales
Wales
Wales is a country that is part of the United Kingdom and the island of Great Britain, bordered by England to its east and the Atlantic Ocean and Irish Sea to its west. It has a population of three million, and a total area of 20,779 km²...
. It lies west of the Blorenge
Blorenge
The Blorenge or simply Blorenge is a prominent hill which overlooks the valley of the River Usk in Monmouthshire, southeast Wales. It is situated in the southeastern corner of the Brecon Beacons National Park. The summit plateau reaches a height of ....
. The hill is a Site of Special Scientific Interest
Site of Special Scientific Interest
A Site of Special Scientific Interest is a conservation designation denoting a protected area in the United Kingdom. SSSIs are the basic building block of site-based nature conservation legislation and most other legal nature/geological conservation designations in Great Britain are based upon...
.
Geology
Gilwern Hill is formed from a series of rock strata of CarboniferousCarboniferous
The Carboniferous is a geologic period and system that extends from the end of the Devonian Period, about 359.2 ± 2.5 Mya , to the beginning of the Permian Period, about 299.0 ± 0.8 Mya . The name is derived from the Latin word for coal, carbo. Carboniferous means "coal-bearing"...
age, each of which dip moderately southwards. The summit plateau is formed from sandstone
Sandstone
Sandstone is a sedimentary rock composed mainly of sand-sized minerals or rock grains.Most sandstone is composed of quartz and/or feldspar because these are the most common minerals in the Earth's crust. Like sand, sandstone may be any colour, but the most common colours are tan, brown, yellow,...
s - the Farewell Rock
Farewell Rock
The Farewell Rock is the name given to a series of sandstones which lie at the boundary of the Coal Measures with the underlying Marros Group in South Wales. Once thought to be a single sandstone, it is now accepted that the same name has been applied to several different sandstones of similar age...
and the Twrch Sandstone which overlie the Carboniferous Limestone
Carboniferous limestone
Carboniferous Limestone is a term used to describe a variety of different types of limestone occurring widely across Great Britain and Ireland which were deposited during the Dinantian epoch of the Carboniferous period. They were formed between 363 and 325 million years ago...
. The latter has been extensively quarried around the eastern, northern and western margins of the hill where it is exposed. Derelict tramways are in evidence in connection with the working of these quarries for limestone in connection with iron and steel-smelting.
Access and recreation
Virtually the entire hill is designated as open countryOpen Country
Open Country is a designation used for some UK access land.It was first defined under the 1949 National Parks Act , and was land over which an appropriate access agreement had been made...
and so access is therefore available freely to walkers. A minor road wraps around its southern and western margins whilst a couple of public footpaths and a restricted byway cross the northern and eastern slopes of the hill. The quarries provide a minor venue for rock climbing
Rock climbing
Rock climbing also lightly called 'The Gravity Game', is a sport in which participants climb up, down or across natural rock formations or artificial rock walls. The goal is to reach the summit of a formation or the endpoint of a pre-defined route without falling...
.