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uller6

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I found this fossil sea urchin in Ithaca, NY in a layer of Moscow Shale (~400 MYO).  I'm trying to figure out exactly what this is, and I think it might be an archaeocidaroid. The earliest published cidaroid is ~260 MYO (J.R. Thompson, et.al. Scientific Reports, 2015).  I don't think this one is a euechinoid but i suppose it could be.  Any feedback would be appreciated.

 

 

 

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