ksabrie Posted February 5, 2021 Share Posted February 5, 2021 (edited) Just inquiring whether these are some kind of fossil print or just natural erosion. I believe it was a lake find in Northeast OH or river find in Southwest IL. If fossil, what from? Thank you! Edited February 5, 2021 by ksabrie Left off information Link to comment Share on other sites More sharing options...
Oxytropidoceras Posted February 5, 2021 Share Posted February 5, 2021 Although I lean toward "natural erosion," it is possible that they are differentially eroded invertebrate burrows (trace fossils). Whatever they are, I really like the blue color of your specimen. Link to comment Share on other sites More sharing options...
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