British Geological Survey
British Geological Survey (BGS)
A public organization whose responsibilities include creating and maintaining geological archives such as maps.
BGS: Maps can be consulted using an app called iGeology (free to download) or on their website.
British online Geology viewer.
Paper maps may be purchased via this website or from the map shop in Upton on Severn. They are convenient to use, but in some cases will be less up-to-date than the on-line resources.
Our area of interest is covered by map sheets 181 (Ludlow) 198 (Hereford) and 197 (Hay-on-Wye), but also in the area of 180 (Knighton) which is not published. There is an in-depth report (memoir) for sheet 198 and a brief report for sheet 197.