These occur on rock surfaces that have been abraded by glaciers where their frequently smooth or polished appearance also exhibits parallel scratches or grooves known as “striations”. Rock fragments embedded in the basal layer of the ice, which scraped the underlying bedrock as the glacier flowed passed, produced these striations.

About Cameron Speirs

Born and brought up in the Scottish Highlands, Cameron, has been interested in outdoor pursuits since he was a wee lad. Over the last few decades he has climbed extensively in the Italian Dolomites as well as summiting the Matterhorn and several other 4000m alpine peaks. Closer to home he has spent many wonderful weekends mountaineering and biking in Snowdonia, Cairngorms, Glen Coe, Skye and Lochaber.
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