Hill of distinctive picrite rock, identified in the Proceedings of the Prehistoric Society in 1951 as the probable source of stone for the Group XII Bronze Age battle axes and axe hammers, by Shotton, Chitty and Seaby. Their work identified several former quarry sites and outcrops of the rock on the hill. Excavations by the Clwyd Powys Archaeological Trust, in conjunction with the National Museum Wales, were funded by Cadw in 2007 & 2008. Initial results were inconclusive, finding only evidence for historic use of the quarry.

T. Driver, RCAHMW, 9th October 2008.