East of Bolsover, the Coal Measures are covered uncomformably by the Permian breccias and magnesian limestone.
East of Bolsover, the Coal Measures are covered unconformably by the Permian breccias and magnesian limestone.
Upper: Red and grey sandstones, marls and clays with occasional breccias, thin coals and limestones with Spirorbis, workable coals in the South Wales, Coal Bristol, Somerset and Forest of Dean coalfields.
They consist of breccias, conglomerates, sandstones, marls, and limestones, with seams of coal and lignite.
It is only in the more northerly part of the country that the pipes are filled with blue ground (or " kimberlite "), and that they are diamantiferous; but over a great part of Cape Colony have been discovered what are probably similar pipes filled with agglomerates, breccias and tuffs, and some with basic lavas; one, in particular, in the Riversdale Division near the southern coast, being occupied by a melilite-basalt.