Large Lower Proterozoic Stromatolites from Wisconsin

Stromatolites

Hand-polished

Geological Time: Precambrian - Lower Proterozic (2.4 billion years old)

Size (25.4 mm = 1 inch): 340 mm wide

Fossil Site: Bad River Dolomite, Bayfield County, Wisconsin

Fossil Code: DS31

Price: Sold


While polished stromatolite is often very pretty, seldom are such traces of rich green color manifest. This unique fossil is also very ancient, dating back to near the boundary of the Archaean and the Proterozoic in Precambrian time. This was a time on Earth when environments were still hostile to life as we know it. It was a time when bacteria reined, and those Prokaryotic bacteria (no cell nucleus) that produced their energy through photosynthesis were ubiquitous and were oxygenating the Earth's atmosphere. This was near the peak of stromatolite formations on Earth. This stromatolite is the oldest microfossil of Wisconsin and occurs below all the banded iron formations. Cutting a piece this large requires a diamond blade more than twice the pieces maximum dimension.

Fossils Purchase Information

Click stromatolite pictures to enlarge


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