Hi all! I believe I just found a interambulacral plate, but have never found one before and no echinoids have been found at this site before (as far as I can discover). I'd love it if I'm right, but if not and it's some strange cirnoid mutation that's okay as well. I found this south of Humboldt, Nebraska in what I believe is the Root formation, (but it was at the bottom of the roadcut, so it could also be from the Wood Siding or Onaga). Any help verifying/properly identifying this would be appreciated!