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Rocks that reveal conditions of early Earth

  • Exhibition Text

    • Clues to the conditions on the early Earth are found in rocks like the Huronian Supergroup, a set of sedimentary rock formations, up to 12 kilometers thick, laid down between 2.5 and 2.2 billion years ago. The rocks are exposed just north of Lake Huron, Canada. Many geologists believe that this sequence of rocks records a change from an oxygen-free to an oxygen-bearing atmosphere.

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  • For Educators

    • Topic: Earth Science

      Subtopic: Atmosphere

      Keywords: Atmosphere, Canada, Geology, Stratigraphic--Huronian, Huron, Lake (Mich. and Ont.), Paleoclimatology

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