Orielton, Pembrokeshire Orielton, Pembrokeshire Orielton is a historic country house near Hundleton in Pembrokeshire, Wales. It is used as a field studies centre for environmental sciences. The first known house at Orielton was a fortified manor built by the Wyriott family in about 1200, which was mentioned by the historian Giraldus Cambrensis ( ). Orielton was the seat of the Owen baronets. The first Owen at Orielton was Sir Hugh Owen, the son of Owen ap Hugh (1518–1613), of Bodeon, near Llangadwaladr, Anglesey. Sir Hugh married Elizabeth Wirriot, who had inherited Orielton from her father George Wirriot. Sir Hugh left Orielton to
Pembrokeshire to its proximity to the relatively warm Atlantic Ocean. Inland, average temperatures tend to fall 0.5 °C for each 100 metres increase in height. The air pollution rating of Pembrokeshire is "Good", the lowest rating. The rocks in the county were formed between 600 and 290 million years ago. More recent rock formations were eroded when sea levels rose 80 million years ago, at the end of the Cretaceous Period. Around 60 million years ago, the Pembrokeshire landmass emerged through a combination of uplift and falling sea levels; the youngest rocks, from the Carboniferous Period, contain the Pembrokeshire Coalfield. The