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  • πŸͺ¨ Geology,
  • πŸ—ΊοΈ Upper Peninsula,
  • Western Upper Peninsula,
• 6/27/25

Finding the Most Ancient Rock in America

Key Topics:

  • Watersmeet, Michigan

  • Age of the Watersmeet gneiss

  • How geologists determined the oldest known rock in America

  • How geochronology works β€” how can you tell how old a rock is?

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