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Unidentified fossil. Fish or shell?


Big T-Rex Fossil hunter

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Anyone familiar with this rock. Long story short have river rock around my house and found these. Going to guess that they get these rocks from the Mississippi somewhere but I live where a once shallow sea was. The fossil gets thin on the other side but goes completely around the stone image.thumb.jpg.25fb3633f4df9e19e65fb8fbd950f213.jpgimage.thumb.jpg.70656c810820cc71dc3570bfe7c8fa21.jpg

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Looks like some sort of shell imprint.

    Tim    -  VETERAN SHALE SPLITTER

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I agree it looks like plicate shell (actual shell rather than imprint). A bit hard to be sure but the shape seems to fit a spiriferid brachiopod.

Tarquin      image.png.b7b2dcb2ffdfe5c07423473150a7ac94.png  image.png.4828a96949a85749ee3c434f73975378.png  image.png.6354171cc9e762c1cfd2bf647445c36f.png  image.png.06d7471ec1c14daf7e161f6f50d5d717.png

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