Erratic Boulders

An erratic boulder is, simply enough, a piece of rock that doesn’t originate from the place where it is found. When these errant boulders are the size of houses however, they take a little more explaining. The city of White Rock, British Columbia, gets its name from a large white erratic that seems completely out of place sitting on the shore of Semiahmoo Bay. In fact, boulders like this one were carried to their current locations by glacial ice, often over hundreds of kilometres. Geologists have suggested that landslides or rockfalls initially dropped the rocks on top of…

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