Glacial striations

  • Exhibition Text

    • The surface scratches on this sample, from an outcrop of granite gneiss, are called glacial striations. During the last Ice Age, rocks and pebbles embedded in the underside of a glacier were dragged across the outcrop, forming these grooves.

      AMNH collection

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  • For Educators

    • Topic: Earth Science

      Subtopic: Earth Formation/Evolution

      Keywords: Gneiss, Geology, Glacial epoch, Geological cross sections

      Audience: General