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Cross section of a Precambrian (2.2 to 2.4 billion years old) fossil stromatolite. The fossil was beautifully agatized by red jasper. Collenia undosa. Biwwabik Formation, Mary Ellen Mine, St. Louis County, Mesabi Range, Minnesota
Cross section of a Precambrian (2.2 to 2.4 billion years old) fossil stromatolite. The fossil was beautifully agatized by red jasper. Collenia undosa. Biwwabik Formation, Mary Ellen Mine, St. Louis County, Mesabi Range, Minnesota
Filename: TMP003.jpg
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