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Fossilized Mollusk with gills or soft tissue? i.d.


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Origin unknown; found in box of junk at yard sale. Guessing it is some type of clam from regular ridges on outer part of piece; inside piece has blackish "softer smoother" piece than outer hard piece. Has striations like gills or hair? Is soft tissue normally found in fossils?  Kind of thought they would be the first thing to dissolve when something dies; if so what is it? 





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This looks like a chert concretion/nodule, to me. 

Better pictures may be necessary to tell for sure. 

Not seeing a fossil here, though.

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The photos need better resolution in order to properly judge this piece, but at this point I'm going along with Tim.

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