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Can someone help me identify this shell piece I found at Walton on the Naze today. It looks complete insamuch as no edge looks broken away but it isn't of such a shape to be of a bivalve.
It measures approx 25mm x 20mm
Possibly a piece of a large barnacle?
I agree. Good call.
It was difficult to find some images to confirm this for you, but here's one
I can't give you a link to the page it is on, because it is now orphaned (Cory sold the item)
You can see internal structures similar to those on your specimen, all to do with other plates and their articulation and muscle attachments.
That makes sense, Thanks guys.