Stromatolites Collenia undosaAlso called Mary Ellen Jasper - an opaque agate Hand polished on both sides Geological Time: Precambrian - Lower Proterozoic (2.2 to 2.4 billion years old) Size (25.4 mm = 1 inch): Stromatolites are 197 mm across longst diagonal and 10+ mm thick. Weighs 1.34 pounds Fossil Site: Biwabik Formation, Mary Ellen Mine, Mesabi Range, St. Louis County, Minnesota Code: DS1714 Price: $175.00 - sold |
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