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Detailed Stromatolite with Very Cool Structure
STROMATOLITE • UNITED STATES
Stock Number XISTR390
EXTINCTIONS Choice

Name:   Collenia undosa
Age:  Precambrian
Formation:  Biwabik Formation
Location:  St. Louis County, Minnesota
Size:  Slab is 6.6 inches across
This specimen is not for sale
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Here is a very large specimen of a stromatolite from the Precambrian of Minnesota. Authorities believe that stromatolites were formed by masses of green or blue-green algae, or ''cyanobacteria''. 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 to reveal the interesting pattern of the stromatolite structure. The muted green and white color and distinct patterns make for a striking display. This is a very detailed slice of an extremely old stromatolite.