Dinobot 25 Posted November 26, 2020 Hi there! I recently purchased this online, could you please help identify this? the seller was unsure if it was a juvenile trex or a nano. It was found in Hell creek dawson County east of Glendive Montana Thank you :) Share this post Link to post Share on other sites
jpc 4,121 Posted November 26, 2020 I'm going to leave this one to troodon. Share this post Link to post Share on other sites
Troodon 19,341 Posted November 26, 2020 Can you take a photo straight down of this view. Need to see the location of the 4th trochanter with respect to the end condyles. Also a straight in view of the broken end. What is the length of what you have ? Share this post Link to post Share on other sites
Dinobot 25 Posted November 26, 2020 On 11/26/2020 at 12:58 PM, Troodon said: Can you take a photo straight down of this view. Need to see the location of the 4th trochanter with respect to the end condyles. Also a straight in view of the broken end. What is the length of what you have ? I haven't received the piece yet and because its an international shipment, it doesn't look like I will get it until early January. I can post pictures then :)....based on the photos the full length of the piece is between 16 and 18 inches. Share this post Link to post Share on other sites
Troodon 19,341 Posted November 27, 2020 Thanks I will need the additional photos because: I actually think it looks more like a proximal tibia and is it Tyrannosaurid or a Herbivore like Edmontosaurus On the broken end I'm trying to determine medullary cavity is hollow and filled with rock/matrix , or is it solid bone? The former says Tyrannosaurid. That end looks more solid but photos are not adequate Share this post Link to post Share on other sites
SULLY 94 Posted November 27, 2020 I was told it was full of matrix and rock for whatever that’s worth. Share this post Link to post Share on other sites
Troodon 19,341 Posted November 27, 2020 10 minutes ago, SULLY said: I was told it was full of matrix and rock for whatever that’s worth. Okay thats good but like to see solid evidence of that Share this post Link to post Share on other sites
SULLY 94 Posted November 27, 2020 Yes sir. I don’t have any more pictures other than the person that started this post unfortunately. I almost lucked out and got this one Share this post Link to post Share on other sites
Dinobot 25 Posted December 7, 2020 @Troodon @SULLY It arrived early Here are some additional photos, the matrerial in the center of the bone (at the break) was coming out fairly easy with a pick. The entire length of the piece is just over 16 inches. Share this post Link to post Share on other sites
Dinobot 25 Posted December 7, 2020 I took a magnified photo I'm not sure if that will help. Share this post Link to post Share on other sites
Dinobot 25 Posted December 14, 2020 @Troodon, @jpc, @SULLY I reached out to university of Alberta and this is what they had to say, "It ia hard to tell for certain, but it looks like either a femur or a tibia. In either case the proximal articular surface seems broken (hence my hesitancy in choosing one way or another). As for if it is theropod, it still could be given how round it is. Hadrosaur and ceratopsian femora tend to be more square ish in cross section..... No worries! Although "hollow" the degree to which that is true is less extreme than in birds and small theropod dinosaurs. I find that bone density (how compact it looks) can be more reliable for large theropods like tyrannosaurs. There is a small hollow core on the specimen you photographed and the bone around it looks tightly packed so I think there is a good chance the initial diagnosis was correct." Share this post Link to post Share on other sites
SULLY 94 Posted December 14, 2020 Perf That was weird. It’s supposed to say perfect Perfect Now we’re good. Share this post Link to post Share on other sites
Troodon 19,341 Posted December 15, 2020 Against my better judgment I decided to put my opinion in on this one. I respectively disagree with the wishy-washy statement of U of A. The bone density of a Tyrannosaurus rex femur is .577 which means the medullary cavity should be about half the bone. Not the little circle you have I believe you have a Tibia and if you look at that bone density its similar to that of a femur based on Horners study. Your bone does not exhibit the density of a trex tibia or femur I dig at a Edmontosaurus bonebed and shared your photos with someone who digs with me that has dozen of tibias to compare against. He said the bone is similar when he compared it to his. Called it Edmontosaurus. The center that is circle in red looks like medullary bone not matrix. Signing-off again to the peace and quite of my bed Share this post Link to post Share on other sites
Dinobot 25 Posted December 15, 2020 My apologies Troodon I hope this didn't take too much time away from your recovery. In either case thank you very much for your time and input. Share this post Link to post Share on other sites
