From Stamps of the World
Treffgarne is a small village in Pembrokeshire, south-west Wales.It lies to the south of the Preseli Hills. The village name is derived from 'tref' meaning town and 'garne' meaning rock, or the 'town of the rock'. The rock in this case is the locally i now exposed, that form the Roche Rhyolite Group. A number of interesting minerals have been recorded including Brookite crystals (Titanium dioxide) and possibly tin. Small regular cavities can be found in the rocks where crystals of at least 1 cm width once resided. Gold has also been found at the rocks from drillcores and placer gold in the local Eastern Cleddau below the village. There is also an old legend of old gold workings near Treffgarne (possibly towards the farm Mount Pleasant) from the Roman period. Roman activity is certainly attested in the region with at least two Romano-British settlements nearby at Ambleston (Castle Flemming) and Wolfscastle and a possible extension of the Roman road from Carmarthen into Pembrokeshire.