The Claerwen Fault is a major SW-NE trending fault in central Wales. It was active as a normal fault during deposition of Late Ordovician to mid- Silurian sedimentary rocks, downthrowing to the northwest. [1] The estimated throw on the fault increases from about 100 m at a shallow level to about 1000 m at depth. There is no discernible change in the grade of metamorphism associated with the Caledonian Orogeny across the fault, suggesting that it was not reactivated later. [2]
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52°16′N 3°40′W / 52.26°N 3.66°W