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Showing results for tags 'hell creek formation'.
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From the album: Hell Creek / Lance Formations
The denticles and enamel of this Ankylosaurus tooth are exceedingly well-preserved.-
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From the album: Hell Creek / Lance Formations
The preservation of theropod teeth doesn't get much better than this. -
From the album: Hell Creek / Lance Formations
It's remarkable that the minute features of this tooth can be preserved with such clarity after 66 million years! -
Late Cretaceous sturgeons from K/Pg impact deposits in North Dakota
Oxytropidoceras posted a topic in Fossil News
'Hell fish' likely killed by dinosaur-ending asteroid is preserved in stunning detail Joanna Thompson, Live Science, October 12, 2022 Four exceptional fossils represent newly described species. https://www.livescience.com/3d-sturgeon-fossils-tanis The open access paper is: Hilton, E.J. and Grande, L., 2022. Late Cretaceous sturgeons (Acipenseridae) from North America, with two new species from the Tanis site in the Hell Creek Formation of North Dakota. Journal of Paleontology, pp.1-29. Another open access paper is: DePalma, R.A., Smit, J., Burnham, D.A., Kuiper, K., Manning, P.L., Oleinik, A., Larson, P., Maurrasse, F.J., Vellekoop, J., Richards, M.A. and Gurche, L., 2019. A seismically induced onshore surge deposit at the KPg boundary, North Dakota. Proceedings of the National Academy of Sciences, 116(17), pp.8190-8199. Yours, Paul H.- 1 reply
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Can radioactive fossils damage other specimens?
Maniraptora posted a topic in General Fossil Discussion
I know next to nothing about radioactivity-- enough to know licking fossils is inadvisable, although I'll admit that wasn't terribly disappointing news. What I'm wondering is whether specimens not radioactive enough to endanger a person are capable of damaging other specimens. Is there a need to segregate displays here, or am I just confused about the mechanics of this? My specific reason for asking is that at the moment I'm planning for my current favorite mineral specimen (which I am babying forever), an almandine garnet from Broken Hill, New South Wales, Australia, to share a small shelf area with a tooth from the phosphate deposits in Oulad Abdoun Basin, Morocco and a few dinosaur bone pieces from the Hell Creek Formation of Montana (one from Dawson County) and Lance Creek Formation of Niobrara County, Wyoming. The shelf is not enclosed, by the way. Thanks for your help! -
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
Even in the final years of the non-avian dinosaurs, the paravians remained diverse, with many species represented in the famed Hell Creek formation.- 1 comment
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- acheroraptor
- acheroraptor temertyorum
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This is part two of my fall trip the first part was posted under trips to the museum Link Part one: Sept Dig Trip: Black Hills Institute - A Trip to the Museum - The Fossil Forum A short trip but like many enjoyed it, found some nice items and the weather was much better that what I saw in June. First let me share some photos of items collected in June that are finished. All Edmontosaurus annectens, Hell Creek Formation Skull element : quadrate 13.75" long Before: After to see its location Center Toe Bone Digit III -1, 5" Front to back Before After Chevron : 14.5" Long , second one in two seasons this size Before Getting there is half the fun SD 85 where I am is straight for miles and miles and miles. They could use some rain. Roadside store It's common to run into Cows crossing a pasture and they typically move but Horses that are stubborn and don't want to move, they are in charge Heavy horn works beautiful herd Love the mailboxes
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I'll break my trip report to South Dakota into two parts. First will be my visit to the BHI followed by collecting adventure The purpose of going to the BHI was to pick up the Leptoceratops maxilla's I left during my June trip. Pete has been collecting and pulling together specimens to understand and possibly describe this ceratopsid in the Hell Creek. The material he's collected so far appears to be from an adult and is much smaller than L. gracilis. My maxilla's seem to fit the smaller morphotype. In addition, the BHI provided me two sets of replicas of my specimens, pretty cool. Tankankaceratops is a controversial ceratopsian described by Ott and Larsen 2010. It's a small Triceratopsini known from a partial skull. Pete showed me its occipital condyle which is fused and indicative of an adult. Very cool nasal horn core. Here is a close up of Struthiomimus sedens hand/part of arm... the business end. Good reference photos A new addition to the museum is a cast of a juvenile Tarbosaurus skeleton that was being assembled in June trip Here is some White River material that was recently collected. Think Pete said the top left skull was a rare Camelidae Hespercyon Took photos for reference of the metatarsals from Nanotyrannus Another reference bone a Nanotyrannus carpal bone, much longer than any found on T rex.
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Hi all! Got another tooth here I'm looking for help on ID with. Only unfortunate thing is the exact county is unknown. Bought from an older collection so all the seller knew for sure is Hell Creek Formation. Seller has been very cooperative and is also very interested if an ID can be found with that little caveat. It was labeled dakotaraptor from the old collection. Initial thought was R. gilmorei or nano but doesn't look to have the defined nano pinch. No mesial serrations visible or can be felt. Best picture he could get of the serrations is below as well. Appreciate any input! Thanks!
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From the album: Hell Creek / Lance Formations
As a theropod tooth aficionado, I thought it useful to compare two families present in the Hell Creek Formation. They become increasingly difficult to distinguish as they get smaller, but this graphic presents some features which may be used to differentiate them on two similarly-sized exceptional specimens. Keep in mind there is some variability due to position, ontogeny, etc., so it's beneficial to study more than one tooth for each family.-
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From the album: Hell Creek / Lance Formations
Not the prettiest tooth, but I very much enjoy fossils like this that demonstrate behavior and tell a story. T. rex and other Tyrannosaurs were unusual among theropods in that they consumed the entire carcass of an animal - bones and all. Most theropod dinosaurs have ziphodont teeth, thin and knife-like, good for cutting muscle from bone. The thick and robust teeth of adult Tyrannosaurs, coupled with their incredible bite force, allowed them to shatter and pulverize bone - even those of the large, formidable herbivores they hunted. Despite the robustness of their teeth, Tyrannosaurs often broke them in the process of biting. It may have been a while before the broken tooth was replaced by a new one, so in the meantime, the broken tooth would continue to accumulate wear. This is one such tooth, a large portion of the tooth was broken off when the animal bit into another dinosaur, and it was still used afterwards for some time before it was replaced. Based on the placement and extension of the carinae to the base of the tooth, and the size, this was an anterior tooth (at the front of the mouth, probably the first dentary tooth) of an adult individual. See Schubert & Ungar (2005) for a discussion on Tyrannosaur tooth wear features (open-access). -
From the album: Hell Creek / Lance Formations
Not the prettiest tooth, but I very much enjoy fossils like this that demonstrate behavior and tell a story. T. rex and other Tyrannosaurs were unusual among theropods in that they consumed the entire carcass of an animal - bones and all. Most theropod dinosaurs have ziphodont teeth, thin and knife-like, good for cutting muscle from bone. The thick and robust teeth of adult Tyrannosaurs, coupled with their incredible bite force, allowed them to shatter and pulverize bone - even those of the large, formidable herbivores they hunted. Despite the robustness of their teeth, Tyrannosaurs often broke them in the process of biting. It may have been a while before the broken tooth was replaced by a new one, so in the meantime, the broken tooth would continue to accumulate wear. This is one such tooth, a large portion of the tooth was broken off when the animal bit into another dinosaur, and it was still used afterwards for some time before it was replaced. Based on the placement and extension of the carinae to the base of the tooth, and the size, this was an anterior tooth (at the front of the mouth, probably the first dentary tooth) of an adult individual. See Schubert & Ungar (2005) for a discussion on Tyrannosaur tooth wear features (open-access). -
I have this very tiny tyrannosaurid tooth from hell creek formation, south dakota. Im wondering if it's possible to know if the tooth is from a infant nano or t-rex? Distal serration density: about 6/mm Can't see any intact serrations on the mesial side. Crown Height: 4 mm Crown base-lenght: 2,5 mm Crown base-width: under 1 millimeter, about 0,8 mm to roughly estimate (very hard to measure this one).
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Hello, Heres another chunk of interesting-looking bone for which curiosity has finally gotten the best of me. This is a piece I picked up in 2021 on my summer dig at the Hell Creek Formation in Montana. I feel there’s a chance this piece might be identifiable. This piece of bone is bowl-shaped with a strange web-like texturing on the convex side. The edge of the bone which is not broken is rounded and almost flower petal like. There is a set of T-shaped rounded ridges on the concave side. Not the best quality bone either, with significant siderite encrustation being present. I have a few wild ideas about what this might be but want to hear some unbiased opinions. Any ideas and help is much appreciated.
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My Spring trip this year was quite a challenge. Last year we had oppressive heat, it was extremely dry with high winds. This year it was rain, rain and more rain and cool. The ranchers however are in heaven with pastures that are green, green and green. Hopefully it continues for them through the summer. So, we had a few rainout days, lots of drizzle and had to deal with gumbo feet, slippery cliffs and wet bones and matrix. Not the best of conditions for collecting and the group's results showed that. On the downside the day we departed Belle Fouche, where we stay, a very bad storm hit with tennis size hail, 70mph winds and lots of flooding. Unfortunately, there was lots of damage to homes, businesses, vehicles and roadways. Lots of work getting that community back to normal. I'll start with the down days. Visited the BHI to dropoff some specimens. Pete Larsen is currently doing a study on the number of Leptoceratops that exist in the HC formation and wanted to see my maxillae to cast and study. He showed us skull elements that pointed too two distinct species. These are most likely associated since they came from the same deposit. Pete showed us a beautiful replica, that he recently acquired, of Raptorex which is a dubious dinosaur. It's actually a juvie Tarbosaurus. BTW the juvie bones are identical to an adult one. Hmm Trex and Tarbo are very closely related...so does that mean that juvie T rex bones would be similar to that of an adult. A new Stan replica was getting ready to be put together A visit to the Carter County museum is a must on a rainy day Their Anatotitan Dinosaur - actually an old Edmontosaurus Triceratops T rex Nanotyrannus Jane
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From the album: Hell Creek / Lance Formations
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From the album: Hell Creek / Lance Formations
A young T. rex tooth. The preservation of the enamel is fantastic, and I like the dark hues. The serrations are also in great shape. There is some minor feeding wear on the tip. -
From the album: Hell Creek / Lance Formations
Sold by the BHI as Nanotyrannus lancensis. However, given the uncertain status of Nanotyrannus' validity, I chose to label it as Tyrannosaurid for now. It is interesting to compare to my other small Tyrannosaur teeth of the same/similar position. The base is clearly more compressed than my baby rex tooth (which is also smaller). -
From the album: Hell Creek / Lance Formations
A Tyrannosaur tooth from Eastern Montana. Given the basal "pinching," this would be Nanotyrannus lancensis if it's valid (otherwise it's T. rex). Interesting to compare it to my other small Tyrannosaur teeth. The tip was probably broken after fossilization, but the gouges on the labial face may be inflicted while the tooth was in use. Note that the enamel is well-preserved with sharply resolved texture and is still clear. -
From the album: Hell Creek / Lance Formations
Sold as Triceratops sp. by the BHI. Normally, Ceratopsid teeth should be considered indeterminate since the teeth of the large-bodied Ceratopsids present in the Hell Creek fauna are virtually indistinguishable. Trusting the ID of the BHI would be to label it as Triceratops sp., but to be conservative (and since I don't know their reasoning behind the ID), I chose to label it as Ceratopsidae cf. Triceratops sp. -
From the album: Hell Creek / Lance Formations
Unworn Hadrosaur tooth from the maxillary (upper jaw). Based on the size, it could be from a juvenile. -
Excellent paper that provides great insights into Hesperornithiformes. Some of the photos can also aid in identification of isolated elements. https://www.mdpi.com/1424-2818/14/4/267/htm
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From the album: Hell Creek / Lance Formations
Tyrannosauridae (Cf. Tyrannosaurus rex) Hell Creek Fm., Wibaux Co., MT, USA This minute tooth is indeed Tyrannosaur: the mc/dc serration densities are virtually identical, and the denticle shape is not like those of Dromaeosaurids. It also has a slight pathology near the tip. -
For those interested in Dinosaurs from North America here is an excellent presentation on Oviraptorosaurs. Demonstrates how the lack of understanding of ontogeny may have impacted the number of described species. Study is ongoing but may point to multiple caenagnathids in the Hell Creek/Lance Formation. https://youtu.be/TpY9ygiG4ng
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