Pennant Measures

[1] However recent reclassification of the sequence has resulted in the definition by the British Geological Survey of the Pennant Sandstone Formation as a sub-unit of the newly established Warwickshire Group.

It overlies the uppermost strata of the newly defined South Wales Coal Measures Group and underlies the rocks of the succeeding Grovesend Formation.

The Pennant Sandstone Formation is now formally subdivided (in ascending order) into the Llynfi, Rhondda, Brithdir, Hughes and Swansea members, each of which units formerly had 'bed' status.

They reach their greatest height (though not their highest stratigraphic level) at the flat summit of Craig y Llyn where they are represented by the Hughes Member.

[4] The sandstone were quarried both in South Wales and the Bristol area for use in paving and roofing is also known as Pennant Stone.

St Paul's Church, Bristol , constructed largely of grey Pennant Sandstone with Bath stone around the door and window frames