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Hi y'all. I bought a lot of fragmentary, unidentified dinosaur rib bones from Hell Creek, Harding Co., SD. I didn't buy them for this bone in particular, but once in-hand, it caught my eye and I wondered if it was identifiable since it had a more unique shape. This of course may be wishful thinking, and I'm fine with it remaining unidentifiable. My primary guess is it being the proximal end of a Tyrannosaur cervical rib. I referenced Brochu (2002) "Osteology of Tyrannosaurus rex: Insights from a Nearly Complete Skeleton and High- Resolution Computed Tomographic Analysis of the Skull." ^scale bar is 15 cm It seems very similar, in my eyes. It has the right size and form on both sides of the rib. However, I don't know if Tyrannosaur cervical ribs are similar to those of other dinosaurs in Hell Creek, so it could still be unident. Or, my lack of knowledge could be unreasonably stretching the resemblance.