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From the album: Hell Creek / Lance Formations
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.-
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From the album: Hell Creek / Lance Formations
A small tooth from a Dromaeosaurid "raptor" dinosaur, located in an anterior position in the mouth. Found in a channel deposit.-
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Found this little guy in the surface float near Glendive, Mt, hell creek formation. I thought it might be a theropod phalange, but a buddy thinks it's champsosaurus. Any thoughts?
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Had a great day fossil hunting in the montana badlands, hell creek formation. Found and partially excavated this piece, we're not sure we're going to be able to get back out there to finish the excavation. Our first thought is it's the top view of a triceratops skull with the two brow horns angled down. The right horn in the picture comes to a natural termination, the left looks like the tip is broken off. It looks to be all one contiguous bone. Any collective wisdom what it might be? Apologies for the poor lighting and lack of measuring stick, we were limited out in the field.
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Below are some teeth from the Hell Creek Formation. Any common name or scientific name would be useful. 23. 24. 25. 26. 27. 28. 29. 30.
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Below are micro teeth from the hell creek formation. Not sure on the ID of these. I have some vague ideas for a couple. Any common or scientific names welcome. 1. Bowfin Cyclurus fragosus tooth? 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12.
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Looking for help on these teeth from the hell creek formation. Any common and scientific names welcome. 13. 14. 15. Bowfin tooth Cyclurus fragosus? 16. 17. 18. 19. 20. 21. 22.
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Identification Though smaller than many imagine T. rex teeth to be, this is indisputably one. It is characteristically robust, and has chisel-shaped denticles with similar denticle densities on each carina.1 Those qualities support its identification as a Tyrannosaurid, and with the locality information confirming it originated from the Hell Creek formation, this must be T. rex. Comments Like most isolated theropod teeth, this is a shed tooth, likely lost during feeding.2 This specimen has exquisite preservation with the enamel texture sharply retained as in life. It however has minor weathering with possible feeding wear at the tip, light root etching, and the base of the tooth has been lightly smoothed possibly by tumbling in an ancient river (enamel is harder so it wouldn't have weathered as much as other portions of the tooth). References 1. Smith, Joshua B. “Heterodonty in Tyrannosaurus Rex: Implications for the Taxonomic and Systematic Utility of Theropod Dentitions.” Journal of Vertebrate Paleontology, vol. 25, no. 4, 2005, pp. 865–87. JSTOR, http://www.jstor.org/stable/4524513. 2. Fiorillo, Anthony R., and Philip J. Currie. “Theropod Teeth from the Judith River Formation (Upper Cretaceous) of South-Central Montana.” Journal of Vertebrate Paleontology, vol. 14, no. 1, 1994, pp. 74–80. JSTOR, http://www.jstor.org/stable/4523546.
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Identification Teeth of Nodosaurids are often confused for those of their rarer relatives, the Ankylosaurids, namely the archetypical Ankylosaurian, Ankylosaurus. (Most) teeth of Ankylosaurus are taller than they are wide, are generally conical in shape with one side flatter than the other, have large denticles on the anterior and posterior edges (6-8 anterior, 5-7 posterior), and have swollen/bulbous bases. Tooth wear is normally on the crown face, compared to wear on the tip (apex) as in Nodosaurids.1,2 Comments This tooth is partially rooted; the root is cylindrical and hollow. There is a wear facet on one side, offset from the center, with grooves roughly perpendicular to the apicobasal axis (suggestive of the mastication motion). This tooth was found in the same county as the holotype of this species. References 1. Carpenter, K. "Redescription of Ankylosaurus magniventris Brown 1908 (Ankylosauridae) from the Upper Cretaceous of the Western Interior of North America." Canadian Journal of Earth Sciences (2004), 41(8): 961-986. https://doi.org/10.1139/e04-043 2. Carpenter, K. "Baby dinosaurs from the Lance and Hell Creek formations and a description of a new theropod." Contributions to Geology (1982), 20: 123–134.
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I was looking at some of my small theropod teeth, but I was not 100% sure what the best ID for these two teeth were. Any input or help would be appreciated. These were sold as Nanotyrannus, but very small chance of dromaeosaurid and Aguja dromaeosaurid respectively, but I think they might be Richardoestesia cf. gilmorei. The cross-section of the Hell Creek tooth I think rules out Dakotaraptor, or at the very least, does not match the known morphology. Edit: Oops, I used the really funky side of the ruler I'm using. I was going to use the millimeter side, but ending up using a side that measures 20mm per. The measurements are accurate though as I used calipers for that. Hell Creek Formation; Garfield County, Montana CBL: 6mm CBW: 2.4mm Mesial Density: 8-9/mm [Towards end of carinae] Distal Density: 11/2mm (5.5/mm) CH is a bit difficult since the tooth has heavy feeding wear, but it is 8.3mm tall, but could be significantly higher. The mesial carinae does not appear to extend to the base. Aguja Formation; Brewster County, Texas CH 6.4mm CBL 3.7mm CBW 1.4mm Mesial Density: Possibly worn down, or none Distal Density: 16/2mm (8/mm)
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Hey all, Does this 3" specimen from the Hell Creek of Powder River co, MO look like a big node or like a section of dome?
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Hi all, Any thoughts on what this piece is from hell creek in Garfield, MO? It’s about 2.5” x 2”. thanks!!
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Hi, A pair of teeth I am interested in. The first one, 1.25 inches. Sold as a dromaeosaur tooth from Hell Creek. Is it actually a Nano? It seems quite big for a raptor from Hell Creek. If a raptor, it would be Dakotaraptor because of the size? Next one is a Tyrannosaur-- just over 1 inch. Is it Tyrannosaur or another large raptor tooth? I have sent seller a message about the exact location -- county and stuff.
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Hi everyone, this is my first post on here. This specimen was labelled as a 'dinosaur jaw bone' and it was found in the Hell Creek Formation near Glendive, Montana. It is about 27 mm long. It does seem to me it belongs to a reptile of some sort but I haven't been able to find anything on the internet to identify it with any more specificity so I'd really appreciate your expertise in identifying it. Thanks everyone!
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From the album: Hell Creek / Lance Formations
Even in the final years of the non-avian dinosaurs, the paravians remained diverse, with many species represented in the famed Hell Creek formation. -
From the album: Hell Creek / Lance Formations
Avisaurus cf. archibaldi Hell Creek Fm., Garfield Co., MT, USA More information Avisaurus is an extinct, toothed Enantiornithine bird that lived at the very end of the Cretaceous. It likely held a similar niche that hawks/eagles do today, preying on small vertebrates like lizards and mammals.- 2 comments
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From the album: Hell Creek / Lance Formations
A rooted Ceratopsid tooth - either Triceratops or Torosaurus (though it's more likely to be Triceratops since it was far more abundant in the HC ecosystem).-
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Hi all, I think this toe bone from the Hell Creek in South Dakota has to either be a digit 2 phalanx 2 from a dromaeosaurid or it's probably not even dinosaurian. Please give me your thoughts. Thanks!!
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