Unknown Ordovician Structure/Fossil

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This topic contains 2 replies, has 2 voices, and was last updated by  Timothy Carroll 9 months ago.

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  • #36027

    Timothy Carroll
    Participant

    This was collected, along with 5 similar pieces, from late Mid. Ord./early Late Ord. rocks in central Kentucky. It was recovered from a thin(~6cm) calcilutite bed that pinched out in a few meters which was sandwiched between thicker calcarenite beds of the Tanglewood Mb. of the Lexington Lm.

     

    I have seen this several times over the years in local rocks, It has been suggested that it could be algal balls. Has anyone seen something similar, or know of something similar?

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    #36142

    Evan Walsh
    Participant

    Looks some sort of like iron mineral too me, but I can’t say for sure

    #36145

    Timothy Carroll
    Participant

    Hi, Evan, thanks for the response. About the only Fe minerals around here are the typical oxides, pyrite, and siderite. This doesn’t appear to be any of those. I’m pretty sure this was organic… I can’t think of a sed structure or mineral that would produce something like it???

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