Brownstones

Early Devonian (Lochkovian-Emsian)

Lithology
Red, brown and purple fluvial sandstones with red mudstone interbeds.

Upper Boundary
Unconformbale, where sandstones and mudstones are overlain by the coarse pebble conglomerate of the Quartz Conglomerate.

Lower Boundary
Where sandstones become dominant over mudstone in the underlying St Maughans Formation.

Representative Sites
Land Grove Quarry / Wilderness Quarry
Soudley Valley Railway Cutting

Information on lithology and boundaries taken from the British Geological Survey Lexicon of Named Rock Units
and BGS Memoirs.