Click on images to enlarge, found in Benton county, Arkansas, Boone limestone formation
My friends over at http://www.lakeneosho.org/ have already done most of the work for me here. This is clearly an evactinopera species. Thanks, Barry, for correcting my identification of this species to, and I quote: plates from a crinoid ... often the crinoid head falls apart before fossilization and the different plates are fossilizes separately.I have never before found one, then again they are easy to lose in the melange of small fossils that populate the limestone in which I spotted this one. I'll be keeping my eyes peeled for more, that's for sure.
Anyhow, an exact species identification would be great, if anyone knows!
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