He has made contributions to the study of medieval mysticism (especially Meister Eckhart), early medieval Welsh and Irish spirituality, and contemporary Systematic Theology.
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His first publications were in the area of the medieval German mystical tradition, especially Meister Eckhart.
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According to Oliver Davies, one such sequence discovered at Ruda in Hunedoara County in modern Romania was 75 metres in depth, or over 200 feet.
It is not an isolated example, because Oliver Davies mentions examples from the Tharsis copper mine and Logroño in Spain, as well as from Dacia.