56Newman, Conor. "Procession And Symbolism At Tara: Analysis Of Tech Midchúarta (The ‘Banqueting Hall’) In The Context Of The Sacral Campus." Oxford Journal of Archaeology, vol. 26, no. 4, 2007, p. 20.

Rob Vance suggests that changes in ritual practices, such as the abandonment of the Ditched Pit Circle, may have been due to dramatic changes in religious practices that may have accompanied climate change, or perhaps an unexpected celestial event, such as a large comet. (Vance, Rob. Secrets of the Stones: Decoding Ireland's Lost Past. Ashfield Press, 2009. pp. 45-8.)