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connorp

Pennsylvanian unknown microfossil

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connorp

I found this small specimen while splitting some Pennsylvanian black shale today. As usual, I'm not sure what it is. Looks like a jaw to me but I really don't know. It measures about 5mm long. Any thoughts? @jdp @RCFossils @deutscheben

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Petalodus12

I agree that it looks somewhat like a jaw. Don’t know from what, though. Hopefully you get an ID

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deutscheben

Fascinating- I haven’t seen anything like it, though- with those structures in the middle it’s quite interesting. 

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jdp

Could be a set of jaws, but I'm not 100% convinced and I'm open to other interpretations.

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Darbi

Wow...that's really a difficult puzzle. I looked through the google images about the fossils of Illinois Pennsylvanian rocks and I didn't come across any that resemble this microfossil. A couple closest things that came to my mind is a crinoid crown with several missing arms and these 'teeth' are pinnules, or a strange-looking graptolite. I have some doubt whether if it's a jaw from some animal.

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jdp

Maybe a claw from some sort of malacostracan?

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