Lake Superior was almost an ocean, not just a sweetwater sea. Read more

The Lake

Minerals of the Lake Superior Region

Courtesy A.E. Seaman Mineral Museum

Iron and copper are far from the only commercial minerals around this vast lake. Gold, platinum, silver, nickel, and gemstones such as amethyst, agates and even diamonds have been found here. Read more

, Natural World

Land, Water & History: Exploring Our Geoheritage

Parks Canada

Have you ever stood barefoot on massive rocks beside Lake Superior? The idea of geoheritage is to connect people to geological history by pointing out significant features and highlighting the way we use and interact with the landscape. Read more

Lake Superior

An Ojibway legend about creation of the St. Marys rapids bears striking resemblance to the accepted scientific account of the forming of the rapids. Read more

Natural World


George W. Robinson

It took Bob Barron 10 years, countless permits and a barge to remove a 20-ton copper chunk from the bottom of Lake Superior and move it to its home at the A.E. Seaman Mineral Museum on the campus of Michigan Technological University. Read more

Natural World

Lake Superior Geology

Susan Robinson

When geologists look at Lake Superior, we see the beauty and drama, but also clues to exciting geological events of the past, a unique history that speaks of fire and ice. Read more

Natural World


David D. Lonsdale

Like the rest of the world, the rocks of Lake Superior's shores form the framework of the landscape and help set environmental parameters. Each feature tells a story about the region’s beginnings.  Read more

Natural World

It’s the story of beauty and the basalt … a story begun in fiery forges more than 2 billion years ago. The two “greenstones” of Lake Superior share a name and a link to ancient lava flows. Read more

Natural World


Jon Nelson

Discovery of ancient stromatolites on Lake Superior's shore astounded the scientific world and reestablished the age of the oldest known fossils. Read more

Natural World

  • 192fossil

    Tsu-Ming Han, Cleveland Cliffs Inc.


  • 192strom

    Gene L. LaBerge


  • 192dolomite

    Gene L. LaBerge


  • 192shore

    Jon Nelson


  • 215ssledge

    David D. Lonsdale


  • 215ssmarble

    David D. Lonsdale


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