Listen: Does Minnesota really have the 'World's Oldest Rock'?
The Curious Minnesota podcast discusses the 3.5 billion-year-old history of Minnesotas most ancient artifact.
Source: startribune.com
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Does Minnesota really have the 'World's Oldest Rock'?
Morton gneiss and the other 3.5 billion-year-old rocks of southwestern Minnesota cities like Morton, Granite Falls and Montevideo are known to geologists around the world.
United States Granite Falls White House District Of Columbia Minnesota River Lower Sioux Indian Community
Source: startribune.com