This was found off the coast of Ireland by a friend of mine. The running gag is it's some kind of fetish or totem and should be immediately discarded, but we're interested in whether it's perhaps a coronal section of a fish skull, a bivalve or something else entirely. Many thanks to anyone participating!

Attachments :

first image
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second image
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(Third image)
higher resolution

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    $\begingroup$ Mostly speculation on my part but the patterns and configuration look like a sand dollar to me. Likely a species in the order Clypeasteroida. $\endgroup$ – Sudachi Mar 3 '17 at 18:33
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    $\begingroup$ I've shared a link of this to the EarthScience.SE chat room to see if we can get some geologist eyes on this as well. $\endgroup$ – theforestecologist Jun 3 '17 at 5:36
  • $\begingroup$ looks like the fossil Brachiopod $\endgroup$ – annndrey Jul 13 '17 at 9:17
  • $\begingroup$ The best page on the web to find fossil ID experts is: Fossil ID - The Fossil Forum ... There was a molar ID on this forum some time ago, and the fossil forum guys knew what it was the same day. $\endgroup$ – DeltaEnfieldWaid Oct 6 '18 at 12:56
  • $\begingroup$ Coronal cross section of a fish skull to me! $\endgroup$ – Donald Trump Oct 14 '19 at 19:38

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