Picture Riddle

What's that??? Any suggestions from anyone?



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2 responses to “Picture Riddle

  1. ThomasD

    Lichens on some kind of clast (of biogenic origin ??? ( note the small (? scale-bar is missing!!! :-P) chimney-like shapes in upper left part of the image) or crust).
    Backround: edge-rounded to well rounded ordinary pebbles (again: scale bar is missing)….

  2. menemorice

    That’s barnacles growing on an old crab shell. Give us real challenge next time, will you?? 😉

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