The buried channel of the River Nith and its marked change in level across the Southern Upland Fault

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Abstract
Synopsis: The base of the buried channel of the River Nith falls eastwards (in the same direction as the flow of the present river) from 650 ft above Ordnance Datum to 400 ft O.D. as it approaches the outcrop of the Southern Upland Fault. Across the fault the base of the channel is proved again at 520 ft O.D. and falls eastwards to 400 ft O.D. at Sanquhar. Ice-gouging is an unlikely explanation of the anomalous levels across the Southern Upland Fault. The possibility of late movement along the Southern Upland Fault, with a resultant downthrow to the north of a little under 200 ft is supported by the details of the buried channel of the neighbouring River Doon. Such probable late fault movement can be dated no more closely than at some time after the Upper Cretaceous (but probably much later) and before the end of the Glacial period.

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