Newgrange was excavated and much restored between 1962 and 1975, under the supervision of Prof. Michael J O'Kelly, Dep't. of Archaeology, University College, Cork (O'Kelly 1986). It consists of a vast man-made stone and turf mound retained within a circle of 97 large kerbstones topped by a high inward-leaning wall of white quartz and granite. Most of the stones were sourced locally (within a radius of 20km or so) but the quartz and granite stones of the facade must have been sourced further afield, most probably in Wicklow and Dundalk bay respectively.
