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Detailed Stromatolite From The Precambrian
STROMATOLITE
Stock Number XISTR33

Name:   Collenia undosa
Age:  Precambrian
Formation:  Biwabik Formation
Location:  St. Louis County, Minnesota
Size:  Slab is 3.4" X 5.4"
This specimen is not for sale
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Here is a large slice of a stromatolite from the Precambrian of Minnesota. Authorities believe that stromatolites were formed by masses of green or blue-green algae. This stromatolite is from the Biwabik Formation and was found at the Mary Ellen Mine. It is believed that this stromatolite is 2.1 to 2.7 billion years old! This stromatolite slab has been highly polished on both sides to reveal the interesting pattern of the mineral replacement. The different colors and unique pattern make for a striking display. This is a very pretty slice of an extremely old stromatolite.