South Pembrokeshire South Pembrokeshire South Pembrokeshire () was one of six local government districts of Dyfed, Wales from 1974 to 1996. It was formed on 1 April 1974 under the Local Government Act 1972, from the following parts of the administrative county of Pembrokeshire: The map shows the district as defined above. However, in 1981, the communities of Bletherston, Clarbeston, Llandeilo Llwydarth, Llandissilio West, Llangolman, Llanycefn, Llys y Fran, Maenclochog, Mynachlog-ddu, New Moat and Vorlan were transferred to Preseli district. It was abolished on 1 April 1996, merging with its neighbouring district of Preseli Pembrokeshire to form a reconstituted Pembrokeshire unitary authority.
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