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  1. ThePhysicist

    Hell Creek theropod bones?

    Hi, y'all. Here are a couple of dinosaur rib sections from Hell Creek (Harding Co., SD). Does the spongey interior indicate theropod, or are these simply chunkosaurian? Bone 1: Bone 2:
  2. ThePhysicist

    Hell Creek cervical rib?

    Hi y'all. I bought a lot of fragmentary, unidentified dinosaur rib bones from Hell Creek, Harding Co., SD. I didn't buy them for this bone in particular, but once in-hand, it caught my eye and I wondered if it was identifiable since it had a more unique shape. This of course may be wishful thinking, and I'm fine with it remaining unidentifiable. My primary guess is it being the proximal end of a Tyrannosaur cervical rib. I referenced Brochu (2002) "Osteology of Tyrannosaurus rex: Insights from a Nearly Complete Skeleton and High- Resolution Comp
  3. Walter Stein's paper on the 15 study of the Tooth Draw Quarry in South Dakota. He is not issuing a press release, so has asked for it to be shared with any who might learn, benefit or enjoy. The Paleontology, Geology and Taphonomy of the Tooth Draw Deposit; Hell Creek Formation (Maastrictian), Butte County, South Dakota. ThePaleontologyGeologyandTaphonomyoftheToothDrawDepositHellCreekFm.ButteCountySD-Stein2021.pdf
  4. FF7_Yuffie

    Hell Creek vertebra

    Hello, Can someone take a look at this and give your thoughts? I bought it without getting it ID'd because of it's ridiculously low price--if I waited to get it ID'd it would have probably been snapped up. So, figured it was worth a buy now, id later. Anyway, it is sold as been "dinosaur vertebra" from Hell Creek, Montana. I think it is Edmontosaurus because of the heart-shaped centrum--others online seem to have that shape to them. I was wondering if it might also be a Thescelosaurus vertebra given the small size, but most of them I see seem to have more rounded centru
  5. ThePhysicist

    Juvenile Tyrannosaurus rex Tooth

    Identification: This tooth was sold as being from a Dromaeosaur. The serrations' shape and their similarity on both carinae say otherwise. In the Hell Creek Formation, there are potentially two Tyrannosaur species. If Nanotyrannus is invalid, then this is automatically a T. rex tooth. For those who consider Nanotyrannus to be valid, this tooth is still T. rex based on the robustness of the tip and serrations, and the CHR (Crown Height Ratio). Tyrannosaurus maxillary teeth may still have minor basal compression, as this one does. This is from a juvenile animal based on its small
  6. ThePhysicist

    Avisaurus archibaldi

    From the album: Dinosaurs

    A Cretaceous bird tooth (avian dinosaur). ~ 4 mm in height.
  7. Hello, seen another tooth, this time it is a fragment of the tip, according to the seller, it is from the Hell Creek Formation, South Dakota. Sorry for the poor quality of the images, but I'm uploading them from my cell phone. As soon as I can, I will replace them with better quality ones. I would appreciate any comments from you.
  8. FF7_Yuffie

    Richardoestesia teeth?

    From a seller I'm gonna buy a pair of verts from. If these are Richardoestesia, I'll add them to the order. Two teeth from Hell Creek, Powder River County. 1.5 cm. The one on the left seems hollow, is this nornal for Richardoestesia teeth?
  9. charlie3425

    Triceratops?

    Hi everyone, I recently bought this 'Triceratops' vert from Hell Creek online. But on receiving it, I have doubts. I might consider it to be an Edmontosaurus vert. It is not that heart shaped and thicker than a Ceratopsian I figure. What are your thoughts? Dimensions: 12,5cm (h), 9cm (w), 7cm (d) - weight +/- 700 grams More pics needed? Thank you!
  10. ThePhysicist

    Hell Creek Tyrannosaur Denticle Variation

    From the album: Dinosaurs

    Comparison of Tyrannosaur denticles (serrations) from the Hell Creek Formation. All of the images are set to the same scale Some differences are likely associated with position in the mouth and/or feeding wear. So, this may not be a perfect illustration of purely ontogenetic variation. The adult T. rex denticles are from an unknown position and carina (being from a tooth fragment), the juvenile T. rex denticles are from the distal carina of a right (rear?) maxillary tooth, and the infant T. rex denticles are from the distal carina of a posterior tooth. The Nanotyrannus
  11. ThePhysicist

    Juvenile T. rex tooth tip

    From the album: Dinosaurs

    Tyrannosaurus rex Hell Creek Formation Garfield Co., MT, USA Note: From the right maxillary of a juvenile animal, but still has adult qualities like a robust tip and denticles.
  12. ThePhysicist

    Juvenile T. rex mesial serrations

    From the album: Dinosaurs

    Tyrannosaurus rex Hell Creek Formation Garfield Co., MT, USA Note: Juvenile animal
  13. ThePhysicist

    Juvenile T. rex distal serrations

    From the album: Dinosaurs

    Tyrannosaurus rex Hell Creek Formation Garfield Co., MT, USA Note: Juvenile animal
  14. doushantuo

    Hell Creek stratigraphy

    The Hell Creek Formation, Montana: A Stratigraphic Review and Revision Based on a Sequence Stratigraphic Approach Denver Fowler Geosciences 2020, 10(11), 435; https://doi.org/10.3390/geosciences10110435 LINK size:approx. 36 mB
  15. I have here three verts from the Hell Creek of Harding County, South Dakota. They were sold as dinosaur. I'm wondering if it's possible to narrow it down further than that. This one is 2.13" long and 1.89" wide
  16. PaleoNoel

    Interesting Hell Creek Vertebra

    Hi everyone, I found this little, mostly complete vertebra in the Hell Creek formation of South Dakota in 2019. I don't really know what to make of it as it's very porous, and amphiplatyan (flat on both sides), although I'm not sure how much of that could be attributable to wear. I believe it's safe to cross of squamate (due to lack of concavity) and champsosaur (overall shape) off the list. While most of the crocodilian verebrae I have found in the hell creek have have a convex and concave end, I am aware that some can be found that are flat sided. The porosity of the bone makes me hopeful th
  17. Thecosmilia Trichitoma

    Fossil Hunting around Bismarck ND

    I have some relatives in Bismarck, North Dakota, and would like to know about fossil hunting opportunities in the surrounding area (preferably in a one hour radius of the city.) I already know about the Geological Survey digs, but would prefer hunting where you can keep what you find (or even just the common stuff.) Are there any pay to dig/ public access sites near Bismarck?
  18. ThePhysicist

    Ceratopsian spit tooth wear surface

    From the album: Dinosaurs

    Commonly called "spit teeth," these teeth were shed by the animal after heavy usage. ^From "Wear biomechanics in the slicing dentition of the giant horned dinosaur Triceratops"
  19. ThePhysicist

    Ceratopsian spit tooth

    From the album: Dinosaurs

    Commonly called "spit teeth," these teeth were shed by the animal after heavy usage. ^From "Wear biomechanics in the slicing dentition of the giant horned dinosaur Triceratops"
  20. Hi everyone, So, after 11 years of collecting fossils around Europe (and this is so much time ‘cause I’m pretty young) I’m pretty bored of not finding Dino and reptile bones (except for a Crocodile tooth set). So I was thinking (and I ask this mainly to the Americans): Other than the associations that you have to pay them like 100$ per day or 1000$ a week (Paleo adventures, Hell Creek fossils, ecc.), there are other quarries in Hell Creek that you don’t have to pay a lot? I actually see people that go by themself or with their 2 friends excavating in Hell Cr
  21. PaleoNoel

    Hell Creek Bird Bone?

    Another small Hell Creek bone found in North Dakota, this time it appears to be a the end of a limb from what I believe may be a bird, small non-avian theropod or perhaps even pterosaur. It has very thin walls which is what made me think that way and I would appreciate any input from my fellow members. The bone is about 1 cm in length and 6 mm at it's widest point at the bulbous base.
  22. PaleoNoel

    Hell Creek Small Digit

    I found this tiny, slender bone at a Hell Creek microsite during my trip to the Dakotas in 2019 with PaleoProspectors. I'm not sure what it came from, but I'm hoping it's theropod, avian or otherwise. It's missing a section of the outer layer of bone and I believe the interior is hollow & filled in with the ironstone common in the formation. The dimensions are 1.7 cm in length and about 3 mm in width. I would appreciate any feedback you may have. In situ shot from the site: The closeup shots did not come out exactly how I wanted them lighting and detail wise. If you would l
  23. PaleoNoel

    Another Tiny Hell Creek Toe

    Another tiny toe found in a North Dakota Hell Creek microsite, this little digit is 1 cm in length and about 5 mm in width. I know it's difficult to identify isolated digits but I was hoping we could potentially narrow it down to a general ID, turtle, croc, champ or other.
  24. I purchased these two fossils a while ago. Both are from the Hell Creek Formation in South Dakota, and both were described as hadrosaur jaws. They definitely seem to resemble the jaws of hadrosaurs, however I've noticed that the empty tooth rows of ceratopsians look extremely similar (to my untrained eyes), which is making me reconsider the seller's ID. I am hoping that someone out there with more knowledge can state confidently if these are ceratopsian or hadrosaur, and preferably if they can briefly explain why they think so. Bonus points if you can state if these are from the upper or l
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