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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.
He introduced a theory of rock formations known as Stratum, based on a pictorial cross-section of the geology under the estate and coal seams in nearby coal works of the Somerset Coalfield, projecting them according to their measured thicknesses and attitudes into unknown areas between the coal workings.