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Smithsonian National Museum of Natural History

Acasta Gneiss

Photograph of a tonalitic gneiss (116542-1) from the National Rock & Ore Collection
Photo by Chip Clark. Click to zoom.
Catalog Number NMNH 116542-1
Locality Northwest Territories, Canada

Gift of Dr. Samuel A. Bowring.

From the exhibit

At 3.96 billion years old, this gneiss is one of the oldest known Earth rocks. The Earth is 500 million years older still, but little record of that early time has survived our planet’s geologic activity.



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