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  1. ThePhysicist

    Ossified tendons

    From the album: Hell Creek Formation Microsite

    Sections of ossified tendons from ornithischian dinosaurs. Especially in an energetic channel environment, these fragile structures are broken into pieces. You’ll notice the surfaces and ends of several of these are rounded from river transport prior to final deposition.
  2. ThePhysicist

    Hell Creek "gold"

    From the album: Hell Creek Formation Microsite

    A fragmented piece of fiery orange amber. Most amber from the HCF is quite small, this one was only a few mm in diameter
  3. Hello, I am trying to identify if this is a T. rex tooth. It's described as "natural juvenile Tyrannosaurus tooth". Location: Hell Creek Formation, Montana. Dimensions: Height: 4.3 cm Width: 3.8 cm I've read this awesome post by troodon, and I'm leaning towards T. rex ("fat" and rounded tip) - but looking forward to seeing your opinions as well. Thanks and have an awesome day ahead!
  4. ThePhysicist

    Edmontosaurus tooth discovery

    From the album: Hell Creek Formation Microsite

    A large hadrosaurid (Edmontosaurus annectens) dentary tooth, recovered from a channel deposit in Montana.
  5. ThePhysicist

    Holostean fish scales

    From the album: Hell Creek Formation Microsite

    Cartoon illustrating differences between lepisosteid and other holostean ganoid scales.
  6. I do have more, but I can't upload them all; it's a decent bit of stuff. Also, I want to know if I should give any to researchers. Most of these are either from the Morrison Formation or Hell Creek. also 1 is from NY in these few anyway
  7. svcgoat

    Tyrannosaurus Vert?

    Sellers says this is a Trex vert from the Hell Creek Formation. Any way to tell the difference between a Trex and a Herbivore? @jpc @hadrosauridae
  8. Is there actually any means of distinguishing Brachychampsa and Borealosuchus teeth, particularly those from the Hell Creek Formation? Insofar as I can see Brachychampsa teeth tend to more globular than those of Borealosuchus, but I have noticed that some Brachychampsa teeth, particularly those closer to the back of the jaw, can be quite elongate, so is there an identifying feature besides shape?
  9. AranHao

    Foot claw

    Hello,everyone. May I know what dinosaur species this claw belongs to? Ornithomimus or Dromaeosaurid? It comes from the HellCreek Formation. Thank you!
  10. svcgoat

    Ankylosaur scute/osteoderm

    Hello does this look like ankylosaur armor? Seller says it's from Hell Creek @jpc @Dino Dad 81 @hadrosauridae
  11. ThePhysicist

    Juvenile T. rex

    From the album: Hell Creek / Lance Formations

    Tyrannosaurus rex Hell Creek Fm., Garfield Co., MT, USA This is from the right maxilla of a juvenile individual (note the lingual wear). Art by RJ Palmer
  12. ThePhysicist

    Acheroraptor tooth

    From the album: Hell Creek / Lance Formations

    A small Acheroraptor tooth with diagnostic longitudinal ridges. Found in a channel deposit.
  13. Found in Garfield Montana Unsure if this is a foot or hand claw even after reading Troodons guide multiple times. I want to know if it's foot or hand What digit If it's a Dromaeosaur Thank you!
  14. hadrosauridae

    Hell creek rib prep

    During my trip to the Hell creek formation of South Dakota last year, I found this large rib weathering out of a hillside ("cliff side" is a better description). I jacketed what was still in situ, and collected all the surface float at the site, and at the bottom of the cliff it was in. The length in the jacket was 32 inches. Can't determine which species this rib belongs to, most likely from Edmontosaurus or Triceratops, but it will have to remain indeterminant. After removing the excess matrix in the jacket, I discovered that the rib was far more fractured than I thought. Because the rib ended up being pinched by the jacket, I had to remove it in sections instead of a single piece. That worked out for the best anyway, for prepping it in my blast box. I have 40 hours into the removal and gross cleaning of the sections. Another 10 hours and still counting for separating all the breaks and cleaning out all the matrix in between bits so that everything can be reassembled properly. It looks like the rib has a healed fracture, but of course, one of the modern breaks goes through the remodeled bone. The jacketed portion looks to be the main shaft of the rib, only missing a few centimeters of the distal tip, based on the the end has thinned and flattened. The collected float should be the majority of the head, but reconstruction of that will be much harder. I wish I had a cast of a complete rib head to correlate the bits of float to their original position.
  15. ThePhysicist

    Myledaphus pustulosus

    From the album: Hell Creek / Lance Formations

    A pile of hundreds of small Myledaphus teeth, recovered from a channel deposit in Montana.
  16. FF7_Yuffie

    T-Rex or Nano

    Hi, thoughts on this? The base looks Rexy, but the tooth is quite thin rather than fat, so I am thinking it might be Nano, not Rex? Any thoughts would be great. 1.2 inches, from Powder Rivery County, Hell Creek
  17. Hello, I am interested in this. A Ilium bone from south Dakota. 23 x 10 x 5 cm. Is anyone able to tell that it is a Pachycephalosaur or is it a different dinosaur? thanks
  18. Fullux

    Habrosaurus?

    Howdy all, I've had this salamander vertebra from the Hell Creek Formation for quite some time now, and I was wondering if there would be any way to place an ID. (I've been told it could be either Scapherpeton tectum or Habrosaurus dilatus)
  19. svcgoat

    Partial Ceratopsian Horn?

    Is this a Triceratops Partial Horn? If so is it nasal or brown? Hell Creek Formation South Dakota 10 inches long
  20. ThePhysicist

    Pectinodon bakkeri

    From the album: Hell Creek / Lance Formations

    This rare theropod tooth was found via screen washing matrix from a channel deposit. It's large for the species and from the front of the jaw. All of the denticles are intact - a spectacular specimen. Pectinodon (meaning "comb-tooth") is a tooth taxon, since no remains attributable to the genus beyond teeth have been found. Pectinodon seems to be a rare member of the Hell Creek fauna, with their teeth being fairly uncommon (though being so small, I'd guess that few people actively search for them). It was a small Troodontid theropod, with teeth that couldn't handle stresses as well as their Dromaeosaurid and Tyrannosaurid cousins (Torices et al. (2018)). This coupled with their small size suggest that Pectinodon was a small/soft prey specialist, preferring the rodent-sized mammals of the time, lizards, insects, etc. Some researchers have proposed omnivory as a possibility for Troodontids (cf. Holtz et al. (1998)). Troodontids famously are regarded as among the most intelligent dinosaurs for their large brain size / body size ratio. This notion serves as fodder for speculation that had the dinosaurs not gone extinct, Troodontids (Pectinodon being (one of?) the last) would have continued to grow in intelligence and develop sentience and civilizations. Troodontid teeth like Pectinodon can be easily identified by their small size, exaggerated, triangular, apically oriented posterior serrations.
  21. hadrosauridae

    Hell creek rib

    This unknown rib was recovered a couple months ago from a private ranch near Faith, SD. I haven't had time to start work on it until a couple days ago. I'm keeping track of my hours on this one just out of curiosity. I never tracked the work on any previous prep projects. So this was found partially exposed with a number of pieces found as float at the bottom of the hill. Everything surface was collected, then the rest of the rib was jacketed to remove. It took me 3 hours to uncover and remove it from the jacket, and then 5 hours separate and clean the pieces of the first section. 12 hours total to clean 3 sections, and then another 3 hours for the micro cleaning and reassembly of those sections. Its only going to get harder, because much of the rest of it looks to be heavily crushed and displaced. It also looks like there is a healed fracture to this rib, but of course, the modern break goes through the remodelled bone.
  22. ThePhysicist

    Amber droplet

    From the album: Hell Creek / Lance Formations

    A small droplet of amber found within an organic-rich layer in laminated siltstone.
  23. ThePhysicist

    Galagadon

    From the album: Hell Creek / Lance Formations

    A mm-sized shark tooth recovered from a channel deposit.
  24. ThePhysicist

    Gastropod

    From the album: Hell Creek / Lance Formations

    A mm-sized gastropod recovered from a channel deposit.
  25. Toast123

    Hell Creek Theropod tooth

    From the hell creek formation in carter county, originally labeled as Dromaeosaurus but as far as I’m aware the only two species of raptor that exists in Hell Creek Fm are Acheroraptor and Dakotaraptor. Please let me know if more pictures are needed to ID CH: 12 mm CBL: 6 mm CBW: 3 mm 7 denticle per 1 mm DISTAL mesial denticles are not visible
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