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.
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.
Source: startribune.com