In those coalfields to the south of the former Wales-Brabant High i.e. the South Wales, Bristol, Somerset, Forest of Dean and concealed Oxfordshire and Kent coalfields, the corresponding group is the South Wales Coal Measures Group.
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The type locality belongs to the Blackstone Formation (Ipswich Coal Measures Group) and is dated to the Carnian age (228.0 - 216.5 million years ago) of the Triassic period.