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The medieval chronicler Giraldus Cambrensis (Gerald of Wales) had topography, history, and current events alike in mind when he observed that Wales is a “country very strongly defended by high mountains, deep valleys, extensive woods, rivers, and marshes; insomuch that from the time the Saxons took possession of the island the remnants of the Britons, retiring into these regions, could never.

History of geological study Geology of Wales and South West England; map South Wales has a written record of geological interest going back to the 12th century when Giraldus Cambrensis noted pyritous shales near Newport. George Owen in correctly identified the stratigraphic relationship between the Carboniferous Limestone and the Coal Measures. Some of the first published representations of fossils were those of fossil plants taken from coal measures near Neath Gibson late 17th century.

In the mid th century, two prominent geologists, Roderick Murchison and Adam Sedgwick used their studies of the geology of Wales to establish certain principles of stratigraphy and palaeontology. They did fundamental work on the Old Red Sandstone but are remembered more for their work on the lower Palaeozoic sequence. It was Sedgwick who established the Cambrian system and Murchison first described the Silurian , naming it for the ancient Silures tribe which occupied mid Wales.

An overlap between the two systems as mapped led eventually to protracted dispute between the two erstwhile collaborators. After their deaths, Charles Lapworth erected the Ordovician system again named for an ancient tribe of northwest Wales, the Ordovices , to account for the sequence of rocks at the heart of the controversy. More recently two locations in mid Wales have been selected to globally define stages of the Silurian period.

Both GSSPs were ratified in See main articles on Cefn-cerig Road and Trefawr Track. The Stanner-Hanter Complex on the English border comprises volcanic rocks around million years old which puts them within the Cryogenian period. The Harlech Grits Group comprises sandstones , mudstones and greywackes forms the eroded core of the dome and within this sequence it is specifically the greywackes of the ‘Rhinog Formation’ which provides the higher hills.