Medium to coarse sandstones occasionally with layers of quartz pebbles which outcrops most of the South-east corner of Herefordshire. Compared to the underlying Raglan Mudstone and St Maughans Formations the Brownstones are both more dominated by sandstones and more uniform in appearance. Deep brown or even purple coloured, the occurrence of bands and spots of pale green are characteristic, particularly in Ross-on-Wye. Further north the boundary between them and the underlying St Maughans Formation is gradational and so distinguishing the two can be problematic. Quartz pebbles, occasionally present in the upper parts of the formation around Ross, are lacking in the St Maughans and so serve to differentiate the Brownstones is present.