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Sep 2010 - North Wales
Bayston Hill Quarry, Shrewsbury
Aggregates are derived from greywackes and conglomerates, which are part of the Bayston-Oakwood formation within the Wentnor series of the Longmyndian (late Precambrian)
Bayston Hill Quarry, Shrewsbury
Unconformity between the Precambrian and the Carboniferous overburden