THE DERIVATION AND DEFINITION OF THE SOUTHERN UPLAND FAULT - A REVIEW OF THE MIDLAND VALLEY - SOUTHERN UPLANDS TERRANE BOUNDARY

Although the Southern Upland Fault (SUF) is widely recognized as a major Caledonoid crustal structure in south Scotland, the derivation of the term 'SUF' has never been definitively established. The historical background to the naming of the fault is discussed and a definition proposed for the Southern Upland Fault (sensu strictu). Traced towards both the SW and NE, the SUF (ss) is represented by multiple fault traces, each the locus of a particular phase of movement. The evidence for the correlation of each fault is reviewed and recommendations for future fault nomenclature proposed. It is concluded that the Stinchar Valley Fault (Pyet Thrust) - SUF (ss) - Firth of Forth Fault line represents the original terrane boundary between the Southern Uplands and the Midland Valley of Scotland.