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Showing results for tags 'Hell Creek Formation'.
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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. -
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 -
From the album: Hell Creek Formation Microsite
A large hadrosaurid (Edmontosaurus annectens) dentary tooth, recovered from a channel deposit in Montana.-
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From the album: Hell Creek Formation Microsite
Cartoon illustrating differences between lepisosteid and other holostean ganoid scales.-
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Oklahoma State University, student discovers new dinosaur species, publishes findings - Hell Creek Formation, South Dakota
Oxytropidoceras posted a topic in Fossil News
Oklahoma State University, student discovers new dinosaur species, publishes findings Oklahoma State University, Sara Plummer , January 24, 2024 Paleontologists Discover New Species of Oviraptorosaur in South Dakota Jan 25, 2024 by Sergio Prostak The open access paper is: Atkins-Weltman, K.L., Simon, D.J., Woodward, H.N., Funston, G.F. and Snively, E., 2024. A new oviraptorosaur (Dinosauria: Theropoda) from the end-Maastrichtian Hell Creek Formation of North America. Plos one, 19(1), p.e0294901. Yours, Paul H.-
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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- 1 comment
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From the album: Hell Creek / Lance Formations
A small Acheroraptor tooth with diagnostic longitudinal ridges. Found in a channel deposit.-
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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.- 1 comment
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From the album: Hell Creek / Lance Formations
A small droplet of amber found within an organic-rich layer in laminated siltstone.-
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From the album: Hell Creek / Lance Formations
A mm-sized shark tooth recovered from a channel deposit.-
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From the album: Hell Creek / Lance Formations
A mm-sized gastropod recovered from a channel deposit.-
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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)-
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- cretaceous mammal
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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
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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.
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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.-
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From the album: Hell Creek / Lance Formations
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From the album: Hell Creek / Lance Formations
A river-worn, shed Ornithischian dinosaur tooth found in a channel deposit. Despite its rough shape, the prominent central ridge and denticles make me think it's Pachycephalosaurid.- 1 comment
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Fossil ID Help - Triceratops or Nodosaur? Hell Creek Formation, Harding County, SD
HellCreekDinosaurs posted a topic in Fossil ID
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- 15 replies
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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
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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.
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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.
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From the album: Hell Creek / Lance Formations
The Hell Creek formation exposed in Montana - a fossil-lover's paradise.- 1 comment
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From the album: Hell Creek / Lance Formations
A shed Triceratops tooth found at a microsite-
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From the album: Hell Creek / Lance Formations
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- edmontosaurus
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From the album: Hell Creek / Lance Formations
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