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Mississippian horseshoe crab trace fossil?


Crinoids

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I had a trip out to the Buffalo wallow group in KY a few years back and found this. I am curious if it is some sort of telson drag mark. 

 

The center mark as well looks like a possible trace fossil but could be geologic. 

 

 

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I don't know what this is, it could possibly be a telson drag mark but it doesn't quite look right,  but it is not a horseshoe crab trace fossil (search for Kouphichnium for examples)

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Convinced this is not a limulid trace. But it is very interesting. Beyond that, I'm a bit stumped. Could be a plant body fossil, could be an invertebrate trace.

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