- n. sudden drop or depression of the horizontal layer of rocks on one side of a fault (Geology)
English contemporary dictionary. 2014.
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Clwydian Range — Moel Arthur, one of the Clwydian Range s hill forts. Seen from Moel Llys y Coed The Clwydian Range (Welsh: Bryniau Clwyd) is a series of hills and mountains in north east Wales that runs from Llandegla in the south to Prestatyn in the north, with … Wikipedia