43O'Kelly, Michael J., and Claire O'Kelly. Newgrange: Archaeology, Art, and Legend. London: Thames and Hudson, 1982. 112.
Geologists have suggested that much of the Newgrange slabs were collected from a rocky beach approximately 20 km (12.5 mi). These blocks were likely brought to the construction site by sea, and then up the Boyne by securing them to the undersides of small boats at low tide. Then they may have been brought uphill to the site by using ropes and log rollers. The stones used for the cairn were from the nearby river terraces. The figure-eight shaped pond below the tomb may have been the site of an ancient quarry.("Newgrange." Wikipedia, the Free Encyclopedia. Web. 30 Jan. 2012. <http://en.wikipedia.org/wiki/Newgrange>.)