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These two continents came together and the rocks that had formed under the ocean were folded and uplifted to create land. A walk up to the Howe (to the west of Loganlea Reservoir) reveals these rocks in vertical layers in the hillside to the north of the stream. The following period of volcanic activity produced most of the rocks and hills in the Regional Park. Volcanoes situated somewhere near Swanston and Colinton produced ash and lava, which created, rocks 5000ft thick. A visit to any of the high hills of the Pentlands will allow you to pick up a rock produced by one of those ancient volcanoes. Rivers and lakes left deposits forming sandstone which can best be seen on East and West Cairn Hills. A huge crack in the Earth's Crust. The Pentland Fault running along the present route of the A702 enabled the hills to be lifted up higher than the surrounding land. The
ice age created the final shape of the hills we see today - Ice
flowed over the top of the hills rounding them off then melt water
eroded the glens and "cleughs". Read our geological
recipe for the Pentland Hills (pdf format, 144k). |
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