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  1. ThePhysicist

    Acheroraptor tooth

    From the album: Hell Creek / Lance Formations

    A small Acheroraptor tooth with diagnostic longitudinal ridges. Found in a channel deposit.
  2. ThePhysicist

    Amber droplet

    From the album: Hell Creek / Lance Formations

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

    Galagadon

    From the album: Hell Creek / Lance Formations

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

    Gastropod

    From the album: Hell Creek / Lance Formations

    A mm-sized gastropod recovered from a channel deposit.
  5. ThePhysicist

    Gypsonictops (Eutherian) premolar

    From the album: Hell Creek / Lance Formations

    This is a very close cousin of ours - a eutherian (placental) mammal from the time of T. rex. This particular mammal has an interesting phylogeny, being positioned basally to insectivores, rodents, and primates. (See Lillegraven 1969)
  6. dongmin

    ankylosaurus fossil

    This fossil is called an Ankylosaurus scoot scute armor plate discovered in the Hell Creek Formation. I don't know which part of Ankylosaurus this fossil refers to, but I would appreciate it if you could tell me which part of Ankylosaurus it refers to! I'm sorry I posted it wrong before so I'm uploading it again.
  7. ThePhysicist

    Thescelosaurus teeth

    From the album: Hell Creek / Lance Formations

    A handful of teeth from a small ornithischian dinosaur. All recovered from a channel deposit in Montana; they show varying degrees of feeding wear and enamel loss from river tumbling. The two on the left are anterior positions, the rest are lateral/cheek teeth.
  8. Just saw this on a Facebook a preprint just released from a very prestigious dinosaur paleontologist Nicholas Longrich. From the abstract "Here, we review multiple lines of evidence and show that the totality of evidence strongly supports recognition of Nanotyrannus as a distinct species." "placement of Nanotyrannus outside of Tyrannosauridae as a non-tyrannosaurid member of Tyrannosauroidea." https://osf.io/preprints/paleorxiv/nc6tk/?fbclid=IwAR3_YkPSpKBQXk5Aiff0sJRKsl59dIqqO5DXveSjV-tx24Vs6ZLuRZdcaHs
  9. Hi All, First time posting! I need help with a fossil I found in the Hell Creek Formation of Harding County, SD this year. At first I thought it was a piece of Triceratops frill, but the more I prepped it, it appears to have edges with bone surface most of the way around it. If it was a piece of frill, I would not expect the edges to taper off (unless it was from a juvenile I guess). If it is a scute then it is absolutely huge and not like anything I have seen before. Hopefully the fossil community can help shed some light on this mystery. Any photos or links to reference other fossils would be helpful as well. Thank you in advance for your help! - Ryan
  10. Ericlin

    Storing fragile amber

    I brought a small lot of amber; they are from the hell creek formation, wibaux county Montana. I was wonder how I should store them. They are extremely fragile, and I’m not sure if I should use superglue or something on them. Let me know if there is anything else I should know about storing them and thanks alot!
  11. Went on a dig as a kid with a group called " Paleo Prospector's" and this was some of the stuff found as well as my last post. Some was identified on the spot but I have my doubts on some. First 2 was labeled "raptor digit" 3-4 labeled turtle jaw 5-6 triceratops spitter 7 freshwater shark vertebrae
  12. Need help identifying some fossils found during a trip I took with my family years ago. I know it was a paleontology dig out at Hell Creek Formation in South Dakota.
  13. ThePhysicist

    Pectinodon tooth

    Identification Troodontid teeth may be identified by their exaggerated, triangular, apically directed posterior denticles1. Pectinodon bakkeri is the only Troodontid species currently named from Lancian strata; its teeth are on average smaller and more gracile than those of its cousin, Troodon. Comments This is a large anterior dentary tooth, recovered by screening matrix from a channel deposit in central Montana. Pectinodon (meaning "comb-tooth")1 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. It was a small theropod, with teeth that couldn't handle stresses as well as their Dromaeosaurid and Tyrannosaurid relatives2. 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))3. References 1. Carpenter, Kenneth. "Baby dinosaurs from the Late Cretaceous Lance and Hell Creek formations and a description of en new species of theropod." Contributions to Geology 20.2 (1982): 123-134. 2. Torices A, Wilkinson R, Arbour VM, Ruiz-Omeñaca JI, Currie PJ. "Puncture-and-Pull Biomechanics in the Teeth of Predatory Coelurosaurian Dinosaurs." Curr Biol. 2018 May 7;28(9):1467-1474.e2. 3. Holtz TR Jr, Brinkman DL, Chandler CL. "Denticle morphometrics and a possible omnivorous feeding habit for the theropod dinosaur Troodon." Gaia. 1998; 15: 159–166.
  14. ThePhysicist

    A vantage over paradise

    From the album: Hell Creek / Lance Formations

    The Hell Creek formation exposed in Montana - a fossil-lover's paradise.
  15. ThePhysicist

    My first (self-collected) dinosaur tooth!

    From the album: Hell Creek / Lance Formations

    A shed Triceratops tooth found at a microsite
  16. ThePhysicist

    Frog jaw

    From the album: Hell Creek / Lance Formations

    An overlooked member of this ecosystem - the humble frog. The night soundscape may have been dominated by them and insects, as in many forested/swampy ecosystems today.
  17. ThePhysicist

    Sunset over Hell Creek

    From the album: Hell Creek / Lance Formations

    During my first pilgrimage to the Hell Creek formation, there were some fantastic sunsets.
  18. 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.
  19. Frightmares

    IMG_4304.jpeg

    From the album: Dinosaur Teeth

  20. Frightmares

    IMG_4306.jpeg

    From the album: Dinosaur Teeth

  21. Frightmares

    IMG_4351.jpeg

    From the album: Dinosaur Teeth

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