The Barnesmore granite of Caledonian (early Paleozoic) age in Donegal, northwest Ireland, is cut by tear faults of two different ages. The Lough Belshade fault trends northeast-southwest and shows left lateral movement of about 2.2 miles. It is apparently of the same age as the Great Glen fault in the Scottish Highlands. The Barnes Lough fault crosses the Lough Belshade fault, trending generally east-west, displaces it, and shows right lateral displacement. Its relation to dikes which are probably of Tertiary age indicates some movement in the Tertiary, and that it is possibly of late or post-Carboniferous or Tertiary age.

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