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  1. I've had these crocodilian teeth from Niobrara County in the Lance Formation for a while now, but I'm not sure how if its possible to ID them beyond "Crocodilian tooth." I've generally heard that the "sharp" morphology are Borealosuchus teeth and the short bulbous teeth are Brachychampsa. Is that a safe rule to follow? I've also noticed that there are some slight differences in the teeth I have (hopefully the pics make it visibile). They're small, but the two on the lower left have noticeable raised striations (not sure what to call it). However, the one on the lower right and on the top are s
  2. Purchased this piece in 2018, but now have concerns about its authenticity. Main area of concern is the base of the horn where the outer layer has chipped away to reveal a white-ish interior that looks a bit like cement/plaster. There is a slight glint to the white material. Any help is much appreciated + can upload more photos if necessary!
  3. Hi I bought this tooth assuming it is Acheoraptor however is it possible it is a small dakota raptor tooth? Size is 1.4 cm long.
  4. Per Christian

    Turtle claw? Croc? Hell creek formation

    I purchased this claw as a Struthuiomimus claw, it was advertised as such. I later on realized it's probably a turtle claw however.. it's from the hell creek formation What do people here think? It's 4.5 cm long @Troodon
  5. Dino Dad 81

    Ankylosaurs osteoderm

    Hi all, I'm looking to confirm whether this specimen from the Hell Creek--Powder River county, Montana--is from an Ankylosaurus. I'm also wondering if its position can be determined, since it has such an unusual shape. Does the hollow proximal side suggest it was part of the tail? Thanks,
  6. Hi Everyone! I'm a little perplexed by this one. The tooth is definitely a Nanotyrannus, that much I'm sure of (Hell Creek, Powder River County, Montana) but it has a strange groove at the base near the mesial side. My best guess is that another tooth dug into it within the jaw or above the gumline. Impacted? Is that the correct dentistry term for that? Also does this count as a pathology or just damage? Anyway, I wanted to see what you all thought if my "impact" hypothesis makes sense or if there's a better explanation. Any insight is greatly appreciated as always!
  7. Hi everyone! I have my eye on a very interesting fossils from the Hell Creek of Powder River County Montana and both the seller and I am not really sure what this is. It appears to be a vertebra of sort with a large bump in the middle. It measures 5.75 x 3.25 x 2.85/2.2 inches for the centrums (14.6 x 8.255 x 7.24/5.588 cm). To me, it looks like two Struthi caudals that were fused together either from an injury or some sort of disease like cancer. It could also be one large pathological vertebra. Do dinosaurs have fused sacral vertebrae? If yes it could be that. Or it could be
  8. Hi everyone! I acquired this vertebrae a little while ago. I'm reasonably certain it's dinosaur and and would greatly appreciate some help narrowing down the ID. It's from the Hell Creek Formation of Powder River County, Montana. The piece is 5 cm tall, 4.7 cm wide, and 2.9 cm long. The centrums are 4.2 x 3.6 cm and 4.4 x 3.7 cm. The bone is really spongy which is best seen in pic 2, the pores are all 1 to 2 mm so I'm kinda leaning toward Theropod (if that has nothing to do with a Theropod ID please correct me). So what do you all think? Any feedback is greatly app
  9. JBkansas

    Edmontosaurus vert

    Picked up a vert, supposedly found in Montana in Hell Creek formation. It's a little crushed but otherwise intact. Any reason to think it's not Edmontosaurus?
  10. Dino Dad 81

    Another Dromaeosaurid premax/anterior?

    This has the size and J-shape cross section of a dromie premax. It also has the protruding mesial carina that you can see from a distal view. What do you think? Hell creek formation, Powder River co, Montana CH: 14.8mm CBL: 7.0mm CBW: 5.3mm Mesial serration density: 4.66/mm Distal serration density: 3.20/mm Thanks!!
  11. Hi everyone! I recently acquired this from the Hell Creek of Carter County. I assumed it was a juvie Rex and but was asked to check the serration density and it came back weird so I thought I'd ask for some input. I'm hoping I can at least rule out Nano which I will be shocked if this even has the possibility of being Nano. We might be looking at another "Larsonraptor" situation (if you know you know). CH is 26 mm CBL is 11 mm CBW is 8.18 mm mesial serration density is 14 for 4 mm distal serration density is 10.5 for 4 mm DSDI is 4/3 Any insight i
  12. jikohr

    Nano or Indet. Tyrannosaur?

    Hi everyone! Another little gem I acquired recently, sold to me as Nano, figured it was Nano, now looking at it I'm wondering if it's indeterminate as the base is damaged so I can't see a pinch, and it's kinda thick. So what do you all think? Any insight is appreciated as always! CH is 3.06 cm CBL is 1.41 cm CBW is .786 cm (I also got a digital caliper finally) Powder River County Montana Hell Creek
  13. jikohr

    Is this T-Rex Tooth restored?

    Hi everyone! I recently acquired a very large (3.5+ inches) digested Rex from McCone County, Montana. The seller said no repair or restoration and I just wanted to make sure. I shined a UV light on it and there is one area that I'm interested in. Along the mesial Carinae is a very dull green under the UV. I tried to capture it with my phone but all I got was blue light since my Camera isn't equipped for that. Typically when I see restoration it's a very bright and vibrant green under UV so I'm not sure if this dull green area is restoration, if it's just an area that was stabilized, or if
  14. SomeDino

    Is this an Acheroraptor tooth?

    I obtained this tooth on a dig back in early June close to Jordan, Montana and was immediately told it was definitely a raptor tooth and was content with that. But more recently I’ve gotten curious and done some reading to try to figure out what exactly it was. From what I’ve read and seen online, it is pretty much a token Acheroraptor tooth with the very apparent ridges and larger serrations on one side while the other has small or none, but I wanted to double check with someone more familiar with the teeth to make sure. I’ll post any pictures requested, thanks! (also, please don’t
  15. jikohr

    Is this a Theropod Vertebra?

    Hi everyone! I acquired this Vertebra a few months ago. It's from the Hell Creek of Powder River County, Montana. The seller listed it as Theropod and I was hoping to make sure. It measures 3 cm long, 2.6 cm tall, and 3.2/3.5 cm wide on the centrums. So what do you all think? Any feedback is greatly appreciated as always!
  16. jikohr

    Are any of these Dromaeosaur?

    Hi everyone! I recently acquired some little Therapod teeth from the Hell Creek of Carter County, Montana. They were advertised as "Dromaeosaurus" so I knew right away most were going to be little Nanos which I was fine with. I screened out the ones that were definite Nanos and was left with these three little mysteries. No ridge along the crown so Acheroraptor is out. the serration densities were a little unusual so I figured I post them to see if any might be Dakotaraptor or if I'm just seeing things. I posted a larger pic of the lingual twist of tooth one right under it since co
  17. jikohr

    Rex or Nano?

    Hi everyone! I have my eye on a potential Rex but the seller isn't sure if it's a rex or a huge Nano. The measurements they gave are 1.75 x .6 x .37 Inches so about 4.46 x 1.52 x .94 cm. It's from powder River County Montana The tooth is an anterior and the oval shaped base combined with it being that large of an anterior says rex to me, but I figured I'd seek a second opinion.
  18. Hi everyone! I have my eye on an interesting claw from Hell Creek in Carter County Montana on "that website" and was wondering if anyone could give some extra insight. The seller listed it as Alvarezsaurus, which I had honestly never heard of before, and a quick search revealed that genus is much older than Hell Creek and from South America. I think they might mean it's from the Alvarezsauridae family, but in any event before I try for it I figured I should ask for an outside opinion on what this is from since this group is new to me.
  19. Rikache

    Ankylosaur Scute or Pachy Armor?

    Hi there everyone! This one might be a bit of a tough one. I came across this listing for a possible partial ankylosaur osteoderm or pachycephalosaurus skull armor and was wondering if anyone could help positively ID the specimen. The fossil was found on private ranch land in Harding County, South Dakota. The specimen is small and obviously a fragment so I’m not expecting any clear answers; but in the past I have come across whole ankylosaur osteoderms that looked very similar in terms of texture and coloring, so my untrained eye is inclined to lean towards that conclus
  20. Hi all, I saw this interesting specimen online. It is labeled as Ankylosaur dermal scute, was found in the Hell Creek Fm., Hill County, Montana. Size is 4,8 cm x 3,2 cm (1.88" x 1.26"). These are the pictures provided: What strikes me about this specimen is the shape of the bony base and the grained surface. My knowledge about osteoderms is rather limited, so I was wondering if anyone can support or refine the given ID? The only image I found so far that resembles that shape, as opposed to the flat sided scutes, is that of an thoracic osteoderm (https
  21. Hi everyone! I acquired this in a batch of turtle claws from Hell Creek in Powder River County, Montana, and it stood out to me as a bit different looking. I'm wondering if it's something else like Crocodilian. Length is 29 mm, width is 11 mm, height is 9 mm. So what do you all think?
  22. Hi everyone! I recently acquired some really interesting little Theropod teeth from the Hell Creek Formation of Carter County Montana. I have my suspicions on IDs, but I would really like a second opinion. Tooth 1: My first thought with this little guy was Troodontid, but I have no experience with Troodontid teeth. It might also be a really tiny Dromaeosaur. No serrations or even a trace of serrations on the mesial side is kind of a unique feature. It doesn't look like they were there and wore off either, it looks like there were never serrations on that side.
  23. jikohr

    Are these Juvenile Rexes?

    Hi everyone! I acquired these two pretty recently and immediately though Juvenile Rex, but after that other one I figured I should be more careful and ask for a second opinion. Both are from the Hell Creek of Powder River County, Montana. Tooth 1: Crown Height: 11 mm Crown Base Length: 5.5 mm Crown Base Width: 5 mm Mesial serration density: 4.5 per mm Distal serration density: 4 per mm Tooth 2: Crown Height: 14 mm Crown Base length: 7 mm Crown Base Width: 5 mm Mesial serration density: 4.5 per mm Distal serration density:
  24. Sergiorex

    Nanotyrannus or Tyrannosaurus rex

    Hello, I’m thinking about buying this for my first dinosaur tooth. And I was just wondering if you guys think it’s a tyrannosaur rex or nanotyrannus tooth. It’s from hell creek formation.
  25. Hello! I saw this 1.06 inch Tyrannosaur tooth from the hell creek formation in montana labled as a juvenile T.rex tooth. (he has other teeth labled as nano teeth so it wasn't his personal preference) I'm not good at telling them apart so that's why i brought it here! So is it a juvie T.rex or a nanotyrannus? Thank you!
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