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George Owen in 1603 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-19th 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.

The original castle in the town of Barry was probably an earthwork or ringwork built on top of an earlier Roman site.

More recently two locations in mid Wales have been selected to globally define stages of the Silurian period.Odo's grandson writing in the 13th Century, Gerald of Wales, records that Odo took his family name from the town and island of Barry and thus founded a family that would resonate in Wales and Ireland.The de Barry family in Wales had their seat at nearby Manorbier Castle and they would later help with the invasion of Ireland.Cefn-cerig Road near Cefn-cerig Farm, Llandovery, is the location of the Global Boundary Stratotype Section and Point (GSSP) which marks the boundary between the Aeronian and Telychian stages of the Silurian period on the geologic time scale.

Similarly Trefawr Track, a forestry road north of Cwm-coed-aeron Farm, Llandovery, is the location of the GSSP marking the boundary between the Rhuddanian and Aeronian stages. : See main articles on Cefn-cerig Road and Trefawr Track.The Norman knight Odo assisted in the conquest of England in the 11th Century.As a reward for his military service he was granted extensive lands around Pembrokeshire and the town of Barry.There used to be a staircase which led up to wall-walk level and from there defenders could get into the gatehouse room.



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