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How did Louis Agassiz extend his glacial theory to Scotland, northern England, and Ireland?
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Louis Agassiz
An undated engraving of Louis Agassiz.
In 1840, Louis Agassiz visited the British Isles in the company of the geologist William Buckland. During this trip, he extended his glacial doctrine to Scotland, northern England, and Ireland by identifying geological evidence—such as erratics, till, and striated pavements of rock—that supported his theory that these regions had once been covered by extensive glacial ice.1