Orkney has a stunning array of coastal scenery which is amongst the most impressive in the British Isles. The wonderful variety reflects the interaction of rock type, glaciation and sea level change in one of the highest energy marine environments in the world.
Orkney is a sandstone lowland moulded by the passage of ice sheets. Glacial erosion has smoothed and rounded hills and ridges on land and excavated the major firths of Hoy Sound, Eynhallow Sound and Westray Firth and to establish the archipelago. Local glaciers developed at intervals on Hoy to carve striking corries and valleys. ...
Active periglacial features are confined to the hill tops of Hoy and reflect a prevailing environment of high wind speeds, heavy but now short-lived snowfalls, high ground moisture levels, and frequent freeze thaw cycles in winter.
Around 15 thousand years ago, the last ice sheet disappeared to leave a barren, scoured terrain. As temperatures rose rapidly, pioneer plants arrived from the south and the low ground was soon carpeted with a rich herbaceous cover.
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