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Historical markers peppered around Minnesota help keep the state's rich history alive. But few are as intriguing — and controversial — as the landmark for Minnesota's most ancient artifact: the "World's Oldest Rock."
On the Curious Minnesota podcast, Eric Roper and Ash Miller discuss the 3.5-billion-year-old history behind this claim on a historical marker in Granite Falls. And they delve into the reasons why Minnesota boasts some very unique geology.
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