GeoGraph - photograph every grid square

The name of this tiny hamlet - not much more than a church and a couple of houses - is well-known to geologists for it lends that name to a great thickness of mudstones (with the occasional sandstone) which are spread across South wales and the Welsh Marches. The rocks of the 'St. Maughans Formation' are the oldest Devonian age rocks in the region. Together with the Raglan Formation, the Brownstones and Senni Beds Formations and a variety of 'Upper Devonian' Formations they form the 'Old Red Sandstone'.