30Jones, Carleton. Temples of Stone: Exploring the Megalithic Tombs of Ireland. Cork: Collins, 2007. 246.
According to Ronald Hutton, "...[The] Bronze Age suffered an ecological disaster profound enough to destroy faith in the traditional deities and rituals." (Hutton, Ronald. The Pagan Religions of the Ancient British Isles: Their Nature and Legacy. Oxford, UK: B. Blackwell, 1991. 134.)