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Egg Shell?

Dino Dad 81

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Once more to squeeze in. This too is from the Lance formation, Weston co, WY. It's about 14mm X 7mm X 2mm. Is it an egg shell?












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HI Dino Dad...

The cross section is completely bone-ish.  Eggshells in cross section, have crystals that run perpendicular to the surface, not the holes I see here.  I can't tell if the surface texture has holes going into the thing, or bumps coming out.  Can you take a photo with the light coming form the upper left?  I think this is a piece of soft-shell turtle.  

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I also see a piece of soft-shell turtle carapace.  I don't know if it helps, but below are pictures of a 5 mm x 3 mm x 1 mm piece of bird eggshell from the Eocene of Nebraska.










Marco Sr.

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nice shot of the eggshell cross-section there in marco's post.  Note the crystal pattern in it. 

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