Kjeragbolten was deposited in a fjord around 50,000 B.C at the end of the last glaciation period in Norway when the glaciers were in retreat. It is therefore a glacial erratic as it is the result of deposition and not weathering.
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At the end of the glaciation the land rebound as the weight of ice was removed and at the same time sea levels were rising. At Kjerag the land rose faster than the sea level and resulted in rock being wedged in its current position.