Listen: Does Minnesota really have the 'World's Oldest Rock'?

The Curious Minnesota podcast discusses the 3.5 billion-year-old history of Minnesota's most ancient artifact.

October 28, 2022 at 2:18PM
The “World’s Oldest Rock” historical marker in Granite Falls. (Eric Roper — Star Tribune/The Minnesota Star Tribune)

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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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about the writer

about the writer

Eric Roper

Curious Minnesota Editor

Eric Roper oversees Curious Minnesota, the Minnesota Star Tribune's community reporting project fueled by great reader questions. He also hosts the Curious Minnesota podcast.

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