Mynydd Marchywel

Mynydd Marchywel is a 418-metre (1,371 ft) high hill in the Neath Port Talbot area in South Wales. Its summit is marked both by a cairn and a trig point. The larger part of the hill is cloaked in modern forestry through which numerous streams fall away westward to the River Tawe, eastward to the River Dulais and southward into the Clydach, the latter two being tributaries of the River Neath.

Mynydd Marchywel
View of Mynydd Marchywel
Highest point
Elevation418 m (1,371 ft)
Prominence263 m (863 ft)
Parent peakFan Gyhirych
ListingMarilyn
Coordinates51.7191°N 3.7847°W / 51.7191; -3.7847 
Naming
Language of nameWelsh
Geography
LocationNeath Port Talbot, Wales
OS gridSN 768037
Topo mapOS Landranger 170 / Explorer 165

Geology

The hill is formed from multiple layers of Pennant Sandstone with intervening mudstone layers and occasional coal seams. All are tilted to the south and southwest towards the axis of the South Wales Coalfield syncline. Parts of its slopes are mantled by glacial till.[1] The coal seams have been worked extensively in the past. One of the last operations was that at Gleision Colliery under the northwestern side of Mynydd Marchywel.

Scheduled Monuments
Mynydd Marchywel summit cairn
This Round cairn dating to the Bronze Age is 10 metres (11 yd) north of the trig pont. The heap of stones, now gradually spreading, has traces of kerbstones amongst the rubble.[2]
Tirlan medieval house sites
(51.709°N 3.7922°W / 51.709; -3.7922 (Tirlan medieval house sites), OS grid ref:SN762026). The earthwork remains of two medieval platform houses, 120 metres (131 yd) apart, are beside a track on the south-east flank of Mynnydd Marchywel, near Tyrlan. Cultivation ridges are also in the vicinity.[3]

Access

Mynydd Marchywel is crossed by Saint Illtyd's Walk which locally runs from Ynysmeudwy to Crynant across the northern slopes of the hill, following one of the very few public rights of way to be found on the hill. There are however numerous forest tracks and most of its western flanks, including the summit area, are designated as open access under the Countryside and Rights of Way Act 2000.[4]

See also

References
  1. British Geological Survey 1:50,000 map sheet 230 Ammanford & accompanying memoir
  2. coflein NPRN: 304577. GGAT PRN: 00518w. Cadw SAM: GM327: Cairn on Mynydd-March-Hywel
  3. coflein NPRN: 15387. GGAT PRN: 00524w. Cadw SAM: GM326: Two Platform Houses.
  4. Ordnance Survey Explorer map 165 Swansea
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