Page:Prehistoric Britain.djvu/126

118 Oronsay. The shell-heap formed an isolated mound between a range of sand-dunes and the sea, measuring about 150 feet in diameter and on an average 25 feet in height. Its surface was covered with grassy turf, having blown sand underneath to a depth of one to five feet. Below this covering was an accumulation of shells and bones, mingled with sand and ashes for a depth of about eight feet. Underneath this refuse-heap the substance of the mound was composed of a series of layers of blown sand and a dark mould, with a few sea and land shells, but no implements.

The implements of bone and horn found in Caisteal-nan-Gillean consisted of eleven harpoons, three awls and 150 "round-nosed"