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For the talk page of the place in Wales, which used to be at this title until 24 August 2017, see Talk:Clatter, Powys
I'm not sure what are the best articles to link to for the landform meaning, and I don't know if a separate article might be needed, but at any rate the following might be of use:
definition of "clatter": Shorter, Alfred (1979). "The geology, physiography and climate of Dartmoor". Dartmoor. National park guides (7th impression (with amendments) ed.). London: HMSO. pp. 1–7. {{cite book}}: Invalid |ref=harv (help); Unknown parameter |editors= ignored (|editor= suggested) (help) p. 4