![](http://www.alamy.com/thumbs/6/EF4A6784-B6C7-4AA6-9DCF-C813A1CF4E66/2MANFHW.jpg)
Granitic gneiss of Archean age, about 3 billion years old. Augrabies Falls National Park, South Africa.
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Photo credit: © Gabbro / Alamy / Afripics
License: Licensed
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Keywords: africa, african, archean, augrabies, falls, geology, gneiss, granitic, metamorphic, national, nature, oldest, park, rock, south, travel