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  1. Brevicollis

    Tyrannosaurus Rex, or Nano tooth ?

    Hello, I was offered this 3,8 cm or 1,5 inch long Tyrannosauridae tooth from the hell creek formation of Montana, Garfield county, and wondered if its really "the king" or its smaller cousin. The base doesnt show the pinch I would expect from Nano teeth, but appears to be a bit slender compared to T-Rex teeth. Maybe its just the jaw position, teeth can variy after that, and also after how old the animal was. Young Rex teeth are different than adult ones. The tooth is also not complete, as its completly missing the transition between it and the root, so we have to work with a partial. And also, the broken ends also could appear like a pinch because of the distance of the enamel, but it really is an "0" shape. T-Rex maxilary tooth ? Saw one in Troodons guide, base shape looked quite similar. I just wanted to make sure, its really one. @hadrosauridae, @ThePhysicist, @North, @JorisVV, your help is appreciated If it should be Nano, I just turn to the side who doesnt believe in the existence of it. Problem solved
  2. This is from Lance Creek Wyoming. It is 0.56 inches wide.
  3. All items in photographs were found in Amarillo Texas, though I highly doubt it is the origin of these items..telluride ore and stibnite ore were acquired at same time..which would lead me to assume that these were found either in Colorado or Canada which would be the Morrison or the Hell Creek formation..I can attach pictures of the oars at a later time but thought these bones were more important first..I only uploaded a few of the associated lots and bones that I have..I assume the entire collection to be about 2000 to 2200 pieces.. I plan on keeping all these fossils.. I'd like to know the names of some of these just so I can tell people what they are when I show them off..I can upload several more pictures upon request..please contact me..thank you
  4. Hello. I am a novice collector and have so far only used a combination of manual cleaning, water/toothbrush, and acetone to remove the sandstone matrix around the back of a dinosaur bone (ischium). I collected it last year as part of a trip to private land in the hell creek formation. I have read that most acids won’t work well on sandstone, although there are some articles recommending DMSO. https://www.researchgate.net/publication/250070644_An_easy_way_to_remove_fossils_from_sandstones_DMSO_disaggregation#:~:text=Many sandstones (89 of 127,is simple and relatively inexpensive. However I didn’t see many folks supporting this articles claim. Maybe I just need to keep at it with the brush, but it is very slow going and I worry about damaging the underlying fossil. I have not soaked it in anything yet, only run it under the tap. I’d appreciate advice from anyone who has experience dealing with sandstone removal like this. Maybe I just need to try soaking it overnight and then brushing again. I’m also not certain what dinosaur species (probably hadrosaur, maybe Edmontosaurus then). Fairly sure it is part of an Ischium. thank you for your time.
  5. I have often seen Edmontosaurus annectens teeth labelled as having come from the Lance Formation in Wyoming for sale online. It is my understanding that the Hell Creek and Lance Formations are very similar in many respects, and given their proximity to eachother it's no doubt quite easy for sellers to confuse or conflate the two, so I was wondering if there were any reliable means by which material from the Hell Creek and Lance Formation could be distinguished. Thanks in advance for any guidance Othniel
  6. Hey everyone I am preparing a rib from the Hell Creek formation it isn't in the greatest of shape and I still had a long way to go but wanted to start thinking about maybe trying restoration for the first time and wondering what you guys recommend. Here is the startand here is where I'm at right nowwith the right side there will need to be some fill to the missing bone. My question is though with the degree of curve on the right end do you think I'm close to the head and should try reconstructing the head? I could be looking at the curve wrong too and just have the bottom of the rib, either way though is there any method you guys use in reconstruction to get the bone texture? Thanks for the help I'll continue updating this as I get further into prepping it.
  7. Sauronitholestes07

    “Sauronitholestes” Tooth from Hell Creek

    Hi everyone, seller claims this was found in the Hell Creek Formation, and that it is from a Sauronitholestes, the tooth measures up to approximately 3/16”.
  8. jikohr

    Rex, Nano, or Indet.?

    Hi Everyone! I picked up this piece on my recent trip to Tucson. It's definitely Tyrannosaur from Hell Creek (Garfield County, Montana) the question of course is what would be the proper label for it. The size and thickness makes juvie rex tempting but the base is too damaged to see if there's a pinch and I've seen Nanos this size before. Both I and the seller were thinking indet. Tyrannosaur while discussing the tooth, but I figured it couldn't hurt to post it here in case anyone sees something we missed. CH: 36.8 mm CBW: 9.88 mm CBL: Hard to measure since there's a piece missing but it's 12.4 mm with damage and probably 15-16 mm if undamaged. Any insight is appreciated as always!
  9. Alex S.

    Hell creek turtle coracoid

    Hello everyone, I just finished preparing what I think is a turtle coracoid but I'm having trouble narrowing down the species of it. It has lovely coloring that makes up for being a partial bone and was not a bad prep except for the very then bone at the edge. It measures 14.3cm long 5.4cm wide and 1.9cm thick at the articular surface.
  10. Happy New Year everyone! Apparently I was good last year because I got gifted a blast cabinet and a mobile problast from vaniman which have been amazing. I made some mods to my hf cabinet that made it much more useful. I added a base frame and castors too it and changed the lighting to led bars which really improve the lighting. I also used some extra angle iron to the back to use as a mounting bracket for my magnifying lens. I also updated the switch to house some plugs. Here it is in all its glory. All in all I'm pretty happy with it the only thing I might do is cut the gloves out and use disposable gloves as the stock gloves are too large for my hand. Here is the air drying system that I put together I will definitely modify it in the future but it works great for now. For the first prep after a bit of practice I chose a fairly beat up Hadrosaur Chevron. It has a palm seed and a stick in the v that I though were pretty cool. There were definitely some mistakes but all in all I'm fairly happy with it. I'll probably go back and re-prep it later but for now I like it. Hope you enjoyed this and I can't wait to show you all the things I'll prep this year!
  11. ThePhysicist

    Myledaphus pustulosus

    From the album: Hell Creek / Lance Formations

    A pile of hundreds of small Myledaphus teeth, recovered from a channel deposit in Montana.
  12. One of the more frequent questions I get asked is to identify teeth from Thescelosaur's and Pachycephalosaurid's since they are so similar in appearance. So when I run across a paper that has anything associated with it, I'll take a look. Recently I read a 2014 paper by Clint Boyd of the School of Mines in SD, that described skull of Thescelosaurus neglectus** from the Hell Creek Formation, with some nice photos of the dentition's. It motivated me to do some additional research to get a better understanding of these teeth using scientific papers instead of anecdotes, supplier listings or my perceptions which I found out were incorrect. My resources being limited I did not find much out there in the public domain and read that little is know especially with Pachycephalosaurid's dentition's. So I'll present what I found and hope there are members of this forum that have access to additional information that can enlighten us. The dentitions of these two families of dinosaurs are heterodontid so the jaws contain different tooth morphologies although some species of Pachy's may not be. To my surprise, the book Dinosauria (2nd ed) states that dentary teeth (from the mandible) from Pachycephalosaurid's are only known from a few species and only Stegoceras from the HC and LC formations. Not sure if that statement is still valid, the book was published in 2007. Thescelosaurus neglectus** Premaxillary Teeth (pm1-6) There are 6 teeth in each Premax. The photo gives you a great image of what they look like, all are bulbous in shape with some curvature in the crown. Also added an isolated tooth, two views from my collection. Maxillary Teeth (mt1-20) There are 20 teeth in each maxillary and take a spade shape. They are compressed, the crown is ornamented with fine ridges from the tip to the base. The more posterior the tooth the larger the wear facet and the tooth takes a different look, looses it's pointed tip. The first photo one can see all of the premaxillary teeth in "A" the anterior teeth in "B" and posterior teeth in "C". I also added a couple of additional pictures isolated teeth one anterior and one posterior Dentary Teeth (dt1-20) The teeth on this skull are poorly exposed see photo below (dt1-7) on one side and only the first three (dt) are visible on the other but they appear to take the shape of smaller but not as robust premaxillary teeth. Since the dentary teeth in this skull so not provide us a good view I used another source Sternberg 1937 paper. In this image only # 8 is a dentary tooth, 1 & 2 are premaxillary, 4-7 are maxillary. The main difference between this and a maxillary tooth is a much more pronounced center ridge near the center of the crown. These teeth are larger than maxillary teeth with a crown that is higher and more pointed. I also added a couple of isolated teeth from my collection. Paper : The cranial anatomy of the neornithischian dinosaur Thescelosaurus neglectus** by Clint A. Boyd ** NOTE There are two species of Thescelosaurus in the Hell Creek & Lance Formation. T. neglectus and T. garbanii. Distinguishig teeth between them I don't believe is possible.
  13. Jonathan Raymond

    My T-rex tooth

    Here's my young T-rex tooth. Species : Tyrannosaurus rex Formation : Hell Creek Place : Powder River County , Montana Age : 66 million years Tooth size: 1,05 inches
  14. Fullux


    Howdy all, I've had this salamander vertebra from the Hell Creek Formation for quite some time now, and I was wondering if there would be any way to place an ID. (I've been told it could be either Scapherpeton tectum or Habrosaurus dilatus)
  15. This is a tooth that lets me doubt the label… It was sold as “Albertosaurus”. Provenance is Hell Creek Formation, Montana. But to my understanding there is no Albertosaurus in the HCF of Montana or am I wrong? The serration count is 3 per mm and 2.5 per mm. Has someone got an idea what it might be?
  16. Mjq8

    Triceratops frill?

    From hell creek fm Looks like frill to me? Bottom half looks broken or weathered?
  17. Fellow members, I am considering purchasing this tooth which is advertised as being a T. rex tooth from the HCF of Carter Co., MT. The seller isn’t able to provide the nearest town. The enamel isn’t perfect but I am guessing that much of the value will be in the length. I am told that there is no repair nor restoration - can anyone see any evidence that might suggest otherwise? The description also states that there is some partial root present. From research, it seems to be an average specimen as is typically found. Or perhaps somewhat above average given that most teeth found are in a worse state. Might members agree that this is a nice 2” T. rex tooth (albeit with some enamel missing) at this price point. There are better out there but those perfect examples will be well north of much more, one suspects. Thankyou in advance.
  18. I've got a few bones that I've been scratching my head over for a couple days. They are from the Hell Creek Formation in Garfield County, Montana. They're extremely thin and hollow, and only one seems to have undergone some compression. I'm including measurements with the photos below. Curious to hear what you all think.
  19. Hello beloved community. Anybody able to weigh in on this specimen's ID. It was labelled as "Dromaeosaur or Troodon Humerus, Hell Creek, Harding County, South Dakota. 1 and a half inches" My hope is that the ID is correct, and the humerus belongs to a baby. My fear is that it's 'just' a Hell Creek turtle humerus. All insight deeply appreciated!
  20. BirdsAreDinosaurs

    Tyrannosaurid premax?

    Hi all, Do you agree that this 0,7 inch tooth from the Hell Creek formation is a tyrannosaurid premax, or could it be something else? Thanks!
  21. Fullux

    Dinosaur rib

    I'm interested in this rib end from the Hell Creek formation of South Dakota and was wondering if there was any way to identify the species. I've compared it to several large species that were native to the area and in my opinion, this piece compares very well with tyrannosaurus. Then again I'm no expert and would very much appreciate a second opinion. I've included examples of ribs from each species I compared it to.
  22. Ericlin

    Dinosaur tooth?

    Hello everyone, new to the forum here, I got a dinosaur tooth from a friend and was wondering if anyone can identify it. It’s about 1 inch and was discovered in the hell creek formation and in the powder River county. Let me know your thoughts and thanks in advance!
  23. Alex S.

    Hell creek micro matrix finds

    Hi everybody I have been sifting through some micro matrix off of a hadrosaur pubis I have been working on and was hoping to get some ID's. I'll label the specimens by number to aid in responses. The first is this therapod tooth that I was thinking could be dromaeosaurid, possibly Archerorapter because of the ridges on crown but unfortunately the tooth isn't in wonderful shape. The tooth CH: 5mm CBL: 3mm CBW: 1mm and the distal Carina are 10 per mm. There aren't any distal Carina preserved. 1. Next is what I think as a gar dermal plate and the several other pieces like it but with different patterns. The dermal plate 2. The other patterns. 3.4. Next is an odd bone fragment that I haven't the faintest ides of what it is. 5. Probably my best find would have to be this vertebra that I think is a Scapherpeton tectum trunk vertebra that I was beyond thrilled to find. 6. I feel like this next one is a tooth and makes me think gar but is fairly beat up so it might not be identifiable. 7. Here's a fragment of bone that is only diagnostic in the fact that it is hollow. 8. Here's some of what I think are gastropods with a small amount of shell remaining. 9. Here is a curious looking fragment that is only half there but seems to have some enamel? 10. And finally here is what I'm pretty sure is just a fragment of tooth enamel. 11. As always think you for your time and knowledge I look forward to hearing from you.
  24. Hi everyone! I think I'll skip the fluff and just get to my points on why I think that's what this one is. ID as Ceratopsian horn: The piece is from Powder River County, Montana. It measures 22.2 x 10 x 8.3 cm. The last two pics show the circular cross section and then blood grooves. The Bite Marks and comparison to a published specimen: Aside from a huge crescent shaped gouge on the distal end I have counted several individual scour marks. A similar specimen has been documented with the same huge crescent shaped gouge with individual scours in almost the exact same places. Here is a quick overview of the individual marks on this specimen and a comparison to the published specimen. I will go into each mark in detail. First is the published specimen as well as the website I saw it mentioned and the original article. My specimen: Main Scour Mark A: A Large Tooth from Tyrannosaurus rex (CH 7.5 cm) fits almost perfectly into MSMA. The mesial carina aligns perfectly with the serration mark. Smaller teeth would not fit. The tooth was found in Garfield County, Montana. Main Scour Mark B: MSMB with the tip of another large T-Rex tooth fit in. The mark measures 10.28 mm long and 7 mm wide. Like MSMA, it was created by the mesial edge of the tooth. The teeth used to fill each mark were photo'd in their approximate position showing them as roughly parallel. The marks are 6.9 cm apart. Both are in almost the exact same position and distance apart as the published specimen mentioned earlier. Secondary Scour Mark A: Very close to, but at an angle to MSMA. There is and area near the scour which might be a continuation though I am not sure. Without the questionable area it measures 13 mm long and 6.2 mm across. Secondary Scour Mark B: This scour mark isn't as deep as the others but is longer at 24.8 mm. Another Scour mark was documented in this are on the published specimen but was at a different angle. Identification of the Bite Marks as Tyrannosaurus rex: In the Hell Creek Formation of Powder River County three large species of Theropod dinosaur are known, Dakotaraptor steini, Nanotyrannus lancensis, and Tyrannosaurus rex. Given the size of tooth required to make MSMA, the best preserved of the scour marks in my opinion, I believe both Dakotaraptor and Nanotyrannus can be ruled out. The fit of a large Tyrannosaurus rex tooth in both size and shape into MSMA also provides evidence even beyond process of elimination of other species. What's more, the existence of a remarkably similar fossil of a Ceratopsian horn with both very similar damage morphology of the distal end and scour placement would indicate consistency in the interaction between Tyrannosaurus and large Ceratopsians. Okay, I had my fun playing paleontologist. So what do you all think? Any insight is greatly appreciated as always!
  25. SharkySarah

    Hell Creek Mystery

    Below are some mystery finds from the Hell Creek formation. Any ideas are welcome. 1. 2. 3. 4.
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