These flat rock surfaces were formed more than half a billion years ago! The bedrock had previously been weathered and eroded to create the flat landscape that you see now. This flat surface is called the sub-Cambrian peneplain and can be seen especially clearly here at Nordkroken. The table mountains were formed later when a sea flooded the peneplain and buried it under sediment. The sea deposited sediments over the peneplain for almost 150 million years and gave rise to the table mountains, including Halleberg and Hunneberg.
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