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Name:
Collenia undosa
Age: Precambrian
Formation: Biwabik Formation
Location: St. Louis County, Minnesota
Size: Slab is 5.3 inches across
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This is a beautiful slab of a stromatolite, Collenia undosa, from the Precambrian of Minnesota. Authorities believe that stromatolites were formed by masses of green or blue-green algae, or ''cyanobacteria''. This stromatolite has been estimated to be 2.1 to 2.7 billion years old! This thick slab has been highly polished on both sides. The pattern of mineral replacement is quite unusual, and the unique red coloration makes for a striking display. This is a wonderful slab of this extremely old stromatolite from Minnesota.
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