A fold in a rock

  • Exhibition Text

    • This rock illustrates how seemingly brittle material can flow, given enough time and heat. It formed over 440 million years ago, when a new mountain range grew on what would become the margin of North America. Originally a shale, the rock was buried to a depth of 8 kilometers, heated to 550 degrees Centigrade, and folded. It was transformed into a schist containing the minerals gray quartz, shiny mica, and red garnet.

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  • For Educators

    • Topic: Earth Science

      Subtopic: Earth Formation/Evolution

      Keywords: Schists, Mica, Garnet, Rock deformation, Shale, Quartz, Metamorphism (Geology)

      Audience: General