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Potomac River find


Ropterus

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Found this surface collecting on the Potomac yesterday. Its not complete unfortunately, and I haven't been able to find what it could be, so I appreciate any help with this. Other than this, my daughter found a small gastropod and we found quite a few teeth, but nothing to brag about.

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Crustacean tail?

Info: Craig Hyatt, retired software/electrical engineer

Experience: Beginner, fossil hunting less than a year

Location: Eagle Pass, TX USA on the border with Mexico, hot dry desert

Formation: Escondido, Marine, Upper Cretaceous

Materials: Sandstone, Mudstone, Shale, Chert, Chalk

Typical: Thalassinoides, Sphenodiscus, Exogyra, Inoceramus

Reference: http://txfossils.com/Txfossils.html

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Thanks for your input Craig and Rockwood. So far, I haven't been able to find anything else online that looks similar. The "fossil" part is raised about 1/4" and it is flat underneath.

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