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Michigan’s Gneiss Surprise: America’s Oldest Rock Found in the Upper Peninsula - The Sun Times News
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Michigan’s Gneiss Surprise: America’s Oldest Rock Found in the Upper Peninsula - The Sun Times News
Scientists have discovered that the oldest intact rock in the United States is not in Minnesota or Wyoming, but in Michigan’s Upper Peninsula. The 3.62-billion-year-old Watersmeet Gneiss is rewriting geological history. Scientists say a new study shows the oldest known exposed rock in the United States is nestled deep in the forests of Michigan’s Upper Peninsula. A recent study published in GSA Today (March–April 2025) lays out the findings of a…
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