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Minnesota Collenia Stromatolite #12
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Minnesota Collenia Stromatolite #3
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Minnesota Collenia Stromatolite #2
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Minnesota Collenia Stromatolite #4
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Minnesota Collenia Stromatolite #6
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Minnesota Collenia Stromatolite #8
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Minnesota Collenia Stromatolite #10
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Minnesota Collenia Stromatolite #9
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Minnesota Collenia Stromatolite #11
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Minnesota Collenia Stromatolite #13
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Minnesota Collenia Stromatolite #14
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Minnesota Collenia Stromatolite #15
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Minnesota Collenia Stromatolite #16
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Minnesota Collenia Stromatolite #17
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Minnesota Collenia Stromatolite #18
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Minnesota Collenia Stromatolite #19
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