Acasta gneiss, oldest known exposed crustal rock in the world, billion years old, Northwest Territories , Canada, tonalite
Acasta gneiss, oldest known exposed rock in the world, The Acasta Gneiss is a tonalite gneiss in the Slave craton in Northwest Territories, Canada. The rock body is exposed on an island about 300 kilometres north of Yellowknife. The rock of the outcrop was metamorphosed to billion years ago and is the oldest known intact crustal fragment on Earth.
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Photo credit: © John Cancalosi / Alamy / Afripics
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