Highland Boundary Fault

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The Highland Boundary Fault is a major fault zone that traverses Scotland from Arran and Helensburgh on the west coast to Stonehaven in the east. It separates two distinctly different physiographic and geological terrains: the Highlands from the Lowlands, and in most places it is recognisable as a change in topography. Where rivers cross the fault they often pass through gorges and the associated waterfalls can be a barrier to salmon migration. <ref>"Natural obstructions: How nature makes salmon leap for their lives". Atlantic Salmon Trust Journal: 44–46. 2011. Retrieved 2 October 2013</ref>

The fault is believed to have formed in conjunction with the Strathmore Syncline to the south-east during the Acadian orogeny in a transpressive regime that caused the uplift of the Grampian block and a small sinistral movement on the Highland Boundary Fault. <ref>Scottish Geology (2008). Loch Lomond: Highland Boundary Fault, http://web.archive.org/web/20110725172821/http://www.scottishgeology.com/outandabout/classic_sites/locations/loch_lomond_fault.html archived from the original http://www.scottishgeology.com/outandabout/classic_sites/locations/loch_lomond_fault.html on 25 July 2011</ref>