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Central Lowlands : ウィキペディア英語版 | Central Lowlands
The Central Lowlands or Midland Valley is a geologically defined area of relatively low-lying land in southern Scotland. It consists of a rift valley between the Highland Boundary Fault to the north and the Southern Uplands Fault to the south.〔Gillen (2003) p.17〕 The Central Lowlands are one of the three main geographical sub-divisions of Scotland, the other two being the Highlands and Islands which lie to the north, northwest and the Southern Uplands, which lie south of the associated second fault line. ==Boundary faults== The Highland Boundary Fault, runs from Lochranza on the Isle of Arran in the south and west through the Isle of Bute and Helensburgh, then forms the northern boundary of Strathmore before reaching Stonehaven in the north east. The fault was active during the Caledonian orogeny, a plate tectonic collision which took place from Mid Ordovician to Mid Devonian periods (520 to 400 million years ago), during the closure of the Iapetus Ocean. The fault allowed the Midland Valley to descend as a major rift by as much as 4000 metres and there was subsequently vertical movement. This earlier vertical movement was later replaced by a horizontal shear. The Southern Uplands Fault runs from the Rhins of Galloway in the west towards Dunbar on the east coast from Edinburgh.〔("Southern Uplands Fault" ) Gazetteer for Scotland. Retrieved 11 January 2008.〕〔("Regional Geology, Southern Uplands - Map" ) Scottishgeology.com. Retrieved 21 March 2008.〕
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