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This is a piece of fossilized bone I bought over the summer. It was sold as being from a centrosaurus. I understand that a perfect ID is impossible, but I was wondering if any one had an idea of what type of dinosaur it could be from, if it even is dinosaur. I was also hoping to find out what type of bone it is. It had an interesting shape to it so I was hoping if nothing else, where in the skeleton it could have been from. It says it’s from the Judith River formation, and the only locality given is eastern Montana. Again I don’t think it’s possible to tell exactly what it’s from, I was just hoping for some general description.
I am right now out in the field, attempting to extract a string of articulated reptile vertebrae in the lower Atco. It is in a soft marl bed just a few feet above the basal Atco. There seems to be articulated ribs associated with the specimen, and so far I have uncovered 14 verts. 9 of them were lose of the surface and bagged in ziplocks, but now I am trying to get the rest out. If anyone has any advice, I need it! The specimen also has articulated ribs. I want to get this thing home tonight, and not destroyed. This is is my first time attempting to extract vertebrae, and I want to do it right and get it home tonight. It is currently 8:54 p.m. here in North Texas. Here are some pictures of the bones when I found them and where the dig is now. I don’t know what exactly it is, but I am guessing juvenile Mosasaur. Age is Earliest Coniacian. 9 verts were on the surface, and at least 6 more uncovered with ribs. Pictures incoming: All 9 verts. @Uncle Siphuncle @erose
The first two I have no idea about where they come from but the third I found in gravel from a creek bed in southeast Nebraska (probably glacial till) and I believe is a pygidum topotype, but could be wrong, the last I found in a shale gravel pit near Mohawk NY in Herkamer county (I'm not familiar with the area's geology maybe someone from that area can help?) Thanks in advance!