What are these things?

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This topic contains 7 replies, has 4 voices, and was last updated by  Nathan Newell 2 months, 2 weeks ago.

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  • #35771

    Nathan Newell
    Participant

    I’ve seen these little donut-shaped critters at a couple of sites in the Appalachian Mountains and I’m wondering what they are. My first guess was that they were some kind of coral, but now I’m thinking they might be cross-sections of sponges. Any ideas? Thanks!

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    #35775

    Evan Walsh
    Participant

    looks like coral to me

    #35777

    Jack Kallmeyer
    Moderator

    @nathan-newell, @evan-walsh  My thought was a moldaic preservation of a crinoid stem segment.

    Jack

    #35901

    Nathan Newell
    Participant

    @evan-walsh, @jkallmeyer Interesting theories, thanks for the replies!

    #46010

    Piotr Bajdek
    Participant

    I agree with @jkallmeyer. These specimens resemble crinoids rather than corals or sponges.

    #46021

    Nathan Newell
    Participant

    @piotr-bajdek Thanks! That’s very helpful. I’ve found a lot of fossils like these and I’ve been labeling them all as corals, but it looks like I’ll have to do some relabeling.

    #46022

    Piotr Bajdek
    Participant

    You’re welcome! When I first found these fossils as a kid, I thought these were fish vertebrae!

    Just search for crinoid stem fossils in Google Images. For example, this specimen looks just identical to your second picture: https://ukfossils.co.uk/2007/11/15/west-angle-bay/crinoid-stem-impression/

    #46023

    Nathan Newell
    Participant

    @piotr-bajdek Whoa! You’re right, that’s exactly what they look like! Thanks for the clarification!

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