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?Tyrannosaurus rex Lance Fm., Weston Co., WY, USA 1" X 1.5" X .5" I got this bone perhaps foolishly last year (although it wasn't very expensive at all; that coupled with the provenance that follows is why I got it). It was sold as a T. rex bone chunk, like many you can find online. There is nothing identifiable about these hunks of bone - you need something more substantial like a whole bone to be certain. I got this bone from a seller who finds many of the fossils himself, was director of a small museum in South Dakota (now gone I believe), and found T. rex "Ivan." This bone was in association with a (pes) claw, toes, metatarsals, tibia, ischium, gastraila, and other limb bone chunks in one site that he identified as all belonging to T. rex. The credibility of the seller and the association I think makes a good case for this being from T. rex. If you really want to spend your money on something like this, you need association (ideally with photos available), and an authoritative source doesn't hurt.