The Farewell Rock is the name given to a series of sandstones 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 across the South Wales Coalfield. The sandstone unit known as the Farewell Rock in the Pembrokeshire Coalfield is continuous with the Cumbriense Quartzite of the main South Wales Coalfield. These are assigned to the uppermost part of the Marros Group which is of Namurian age. In the South Wales Coalfield, the name is given to a thicker, overlying sandstone unit which, though formerly assigned to the Millstone Grit Series, is now assigned to the Lower Coal Measures which are of Westphalian age.
Source: Wikipedia.org
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Powys, United Kingdom
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