SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY
Glacial erratics resting on a Carboniferous limestone pavement near Black Head, County Clare, Ireland. An erratic is a boulder which has been transported from its original source by a glacier, and has been left stranded by the melting of the ice. Erratics can be carried a considerable distance and are therefore often of a different type from surrounding rocks.
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