55Fenwick, Joe, and Conor Newman. "Geomagnetic survey on the Hill of Tara, Co. Meath, 1998-9." Discovery Programme Reports: 6: Project Results, 2002, p. 8.

Regarding the probability that the pits on either side of the ditch once supported timber uprights, Fenwick went a step further: "If I were to take a guess, I would suspect that you had massive timber uprights onto which there were a series of lintels because it helps define the space, to define the perimeter. It works very well visually." (Vance, Rob. Secrets of the Stones: Decoding Ireland's Lost Past. Ashfield Press, 2009. pp. 104-5.)