The Kjeragbolten lies in a weak tectonic zone, allowing the river to dig into the surrounding sandstone fjord. During the several ice ages, which are known in Scandinavia, Norway was completely covered in glaciers. Between the ice ages, the meltwater formed and reformed the valley up to twenty-two times. After the last ice age, global warming caused a rise in sea level, flooding the fjords. The Kjeragbolten boulder was deposited during the last glacial period, at around 50,000 B.C.E. As the Norwegian Glacier melted, it was accompanied by a rebound in rock formations as the ice was removed. In Kjeragbolten's case, the rebound was actually faster than the rising sea level, which wedged the rock into its current position.
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