Stromatolites Collenia undosaPolished on both sides Geological Time: Precambrian (Proterozoic 2.2 - 2.4 Billion Years Old) Size: Stromatilte is 6 inches across widest diagonalis 245 mm across longest diagonal; up to one inch thick Fossil Site: Biwabik Formation, Mary Ellen Mine, Mesabi Range, St. Louis County, Minnesota Fossil Code: DS2014 Price: Sold |
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