2.4 Billion Year Old Precambrian Stromatolites


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

Size: 192 by 100 mm maximum

Fossil Site: Bad River Dolomite, Bayfield County, Wisconsin

Wisconsin Proterozoic StromatoliteWhile 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 Archean 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 occures below all the banded iron formations.

Also see: Stromatolites Across Geologic Time

Click stromatolite pictures to enlarge

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