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I recently purchased this vertebrae which was sold as a mosasaur (Clidastes) vertebrae. I wasn't convinced that the vert was Mosasaur (or even marine reptile for that matter) in origin when I bought it, I simply bought it because I thought it was a nice looking vertebrae. But now I thought I might give it a shot to try and get an ID on this thing. It was found in the Gober Chalk, Austin Group, Gober, Fannin County, Texas, USA and dates back to the Campanian, Cretaceous (± 80 mya). I don't really know what the vertebrae could be honestly, I don't believe it to be Mosasaur in origin or any other marine reptile like Plesiosaurs or Pliosaurs. I have been searching to see if it might belong to a cretaceous giant sea turtle like Archelon or something but I can't find really find any pictures of sea turtle verts to compare with. When I posted the vertebrae in my collection topic some members were inclined to point toward the vertebrae being mammalian in origin, but due to the size that would mean it probably isn't cretaceous in origin due to it's large size. So I made some more photos to get a better image of the vertebrae, I made some close ups a well of the bone structure and of the some of the places where you can clearly see remains of a chalk like matrix stucking to the bone. So I was hoping if someone might be able to put an ID on this thing and maybe if it is mammalian in origin where it might originate from should it not be cretaceous. Thank you in advance!