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South West Archaeology undertook a short programme of archaeological monitoring in September 2009 at Treyarnon, which revealed a largely featureless expanse of weathered shale bedrock, into which the foundations and service trenching of the former dwelling had been cut. In the northeast corner of the site, where the soakaway for the new dwelling was to be located, parts of three intersecting linear features were identified. One of these features curved gently to the north and potentially formed part of a penannular ring-ditch of presumed Prehistoric or Romano-British date. With the exception of two small beach pebbles, no finds were recovered from the site.