Name:
Collenia sp. (Stromatolite) Age: Precambrian Formation: Bad River Dolomite Location: Bayfield County, Wisconsin Size: Slab is 5.25 inches across This specimen is not for sale Click here for similar specimens that are for sale
This is an extremely colorful example of a Collenia stromatolite from the Precambrian of Wisconsin. Authorities believe that stromatolites were formed by masses of green or blue-green algae, or ''cyanobacteria''. This stromatolite specimen is believed to be 2.2 billion years old! This very attractive slab has been highly polished on one side for optimal display. The unique greenish-and-white banded coloration of this stromatolite makes for a striking specimen. This is a beautiful example of an extremely old piece of the Earth's history.