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Mynydd Meio
Mynydd Meio is a 322-metre-high hill in the county borough of Caerphilly in South Wales. Parts of its western slopes fall within Rhondda Cynon Taf county borough. Its eastern slopes drop away to Cwm yr Aber between Caerphilly and Abertridwr and its western slopes to the valley of the Taf. The high point is just over 200 m north of the trig point which sits at 321 m above sea level. The hill is crossed by the Senghenydd Dyke, an ancient earthwork considered to date from the 13th century and associated with nearby Caerphilly Castle.〔(Coflein record of Senghenydd deer park )〕 == Geology == The hill is formed from the Hughes Sandstone, within the Pennant Sandstone Formation, a sedimentary rock of late Carboniferous age (c 309-306 million years ago).〔British Geological Survey 1:50,000 map sheet 249 ''Newport'' & accompanying memoir〕〔(BGS ‘Geology of Britain’ viewer )〕
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