Concept

Long Mountain (Powys)

Summary
Long Mountain (Cefn Digoll) is a hill straddling the boundary between Powys (Wales) and Shropshire (England) to the east of Welshpool though the summit at 408 metres (1,339 feet) at Beacon Ring () is within Wales. Long Mountain is a Marilyn (a hill with topographic prominence of at least 150 metres), having a prominence of 305 metres (1,000 feet). Geology Long Mountain is formed from a succession of sedimentary rocks dating from the Silurian period. In stratigraphic order i.e. youngest/uppermost first, these are: *Raglan Mudstone Formation (siltstone, mudstone) *Temeside Mudstone Formation (mudstone, siltstone, sandstone) *Tilestones Formation (sandstone) *Cefn Einion Formation (mudstone, siltstone, sandstone) *Knucklas Castle Formation (mudstone, siltstone, sandstone) *Bailey Hill Formation (siltstone, sandstone) (including the Cwm-yr-hob Member (mudstone, siltstone, sandstone) *Irfon Formation (mudstone, siltstone) *Gyfenni Wood Shale Formation (mudstone) *Trewern Brook M
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