Gray-white quartzite

  • Exhibition Text

    • This quartzite formed in a riverbed, as indicated by the well-developed cross-bedding (sedimentary layers at angles to the main horizontal layers). Its buff to gray color is typical of the oldest rocks of the Huronian Supergroup. The color suggests deposition when the atmosphere contained no free oxygen. 

      AMNH collection

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  • For Educators

    • Topic: Earth Science

      Subtopic: Atmosphere

      Keywords: Geology, Stratigraphic--Huronian, Quartzite, Oxygen, Atmosphere, Paleoclimatology

      Audience: General