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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.

Details

  • Title: Acasta Gneiss
  • Location: Northwest Territories, Canada, North America
  • Type: MIneral
  • Rights: This image was obtained from the Smithsonian Institution. The image or its contents may be protected by international copyright laws. http://www.si.edu/termsofuse
  • External Link: View this object record in the Smithsonian Institution Collections Search Center
  • USNM Catalog Number(s): 116542
  • Scientific Name: Tonalitic gneiss
  • Photo Credit: Chip Clark, Smithsonian Institution National Museum of Natural History
  • Field: Mineral Sciences

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