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1,100,000,000 Years Ago

Lake Superior as we know it to day

12000 years ago

glaciers melt

12000 years ago

rocks let behind are for Canada

Encroaching Seas Cover Lake Superior Area

Mile High Glacier Cover Norther Part of the US

540,000,000 years ago

2,000,000 Years ago

rocks formed

Limestone, Chert, Agate, Flint, Jasper

Hot Water Brings Copper

1,100,000,000 Years Ago

Rocks Formed

Chert, Jasper, Agate, Flint, Amygdaloidal Basalt

Rodina Super Continent

Mid Continent Rift

1,100,000,000 Years Ago

Rocks Formed

Vesicular Basalt , Ophitic Basalt, Porphyry Basalt, Gabbo, Rhyolite, Granite

Continental Collision

1,100,000,000 Years Ago

Rocks Formed

Slate, Gneiss, Schist

Quiet Periods

1,100,000,000 Years Ago

Rocks Formed

Copper Harbor Conglomerate, Freda Sandstone, Jacobvill Sandstone, Nonesuch Shale

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