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  1. ThePhysicist

    Juvenile Tyrannosaurus rex (2)

    From the album: Dinosaurs

    Tyrannosaurus rex (Juvenile) Hell Creek Fm., Garfield Co., MT, USA ~ 13 mm crown height ^wonderful art by RJ Palmer Fossil in Collections: http://www.thefossilforum.com/index.php?/collections-database/chordata/dinosaurs/juvenile-tyrannosaurus-rex-tooth-r2081/ The lighting wasn't very good, so I might redo this photoshoot later.
  2. ThePhysicist

    Triceratops prorsus (2)

    From the album: Dinosaurs

    Triceratops prorsus Hell Creek Fm., Harding Co., SD, USA 3.5 cm height On the ranch where this tooth was found, only T. prorsus skulls have been found in the 30+ years the company has operated there, lending a very probable, precise identification for this Ceratopsian tooth. (T. prorsus was one of the last dinosaurs, younger than T. horridus. The two species are also stratigraphically separated in the Hell Creek Fm., so it makes sense that one may only find one species in a particular deposit.) For most Ceratopsid teeth (from the Hell Creek Fm., for example),
  3. I see a lot of misunderstanding on what is being sold online at auctions and dealers sites. Some have it correct but most mix up the terminology. So here is Anky 101 aimed at Novice collectors and I will keep it simple. What you see sold in most markets are teeth from late Cretaceous North American locations mostly Montana, Wyoming and the Dakota's so I will focus on those areas. (Hell Creek, Lance, Two Medicine and Judith River Formations) Teeth from Canadian locations will have similar characteristics. There are two basic families of armored dinosaurs in these regions Ankylosauri
  4. Just returned from collecting trip to my usual Edmontosaurus bonebed site in South Dakota. It was one of the worst weather trips over the years I've been collecting with daily AIR temps between 90 to 102 degrees F and winds typically in the 25 mph range and some days gusts hit 40mph. Temps on the bluff were much higher and the winds limited our use of tents so we were constantly blasted with sand and sun. The good news was no rain so despite the hardships one could collect. We targeted getting to the site by 6am and gave up around 2pm. I pass through Hill City, SD to get
  5. I just returned to the site I mentioned in my previous Hell Creek trip report to give spend the day digging and exploring to see what else was left behind. I also stopped at another property in the morning that I recently obtained permission for. The first site was beautiful and, despite the sparse fossils, was a fun way to start the day. Lower in the layers some very sparse and fragmentary fossil shell material was found but it was really too fragmentary to collect or even get a good photo without bringing macro lenses. The lower portions did transition int
  6. Nothing new but this was presented at the SVP conference late in 2020 and could be of interest to some. Nothing has been published the and all based on one isolated humerus. Additional discoveries are most likely needed to demonstrate they were in that fauna. A POSSIBLE LAMBEOSAURINE (HADROSAURIDAE: DINOSAURIA) HUMERUS FROM THE LATE MAASTRICHTIAN HELL CREEK FORMATION OF SOUTH DAKOTA Rolleri, L., Gates, Terry A., Zanno, Lindsay E. North Carolina Museum of Natural Sciences, Raleigh, North Carolina, U.S.A. Both hadrosaurine and lambeosaurine hadrosaurs were common components of Camp
  7. Trying to differentiate a small to midsize Nanotyrannus and Dakotaraptor is pretty difficult. It appears that Dakotaraptor teeth are not common and sellers are quick to assign Nanotyrannus teeth to them. You need to look at all the characteristics before making a determination on a tooth and it may turn out to be indeterminate. REMINDER we have a limited view of these teeth. We have not see a complete dentition and most likely there some variations in dental positions. What is listed below is our current knowledge based on isolated teeth and the few found with the holo
  8. Hi all, I could not resist and took another shot on my quest to obtain a Dakotaraptor tooth. Here the tooth in question this time: It was found in the Hell Creek Formation, Garfield County. Measurements are: CH 1,41 cm - CBL 0,68 cm - CBW 0,3 cm - denticles per 5mm are 22 mesial and 19 distal. Note the slight tilt of the denticles towards the tip of the tooth. It's the best fit I have found so far, what deviates from the dePalma description is the shape of the base, it has a pinch, but I would not consider it rectangular. As a side note, it looks exactly like the base of Acheroraptor
  9. To make a long start to a story short, due to work connections of a relative I recently got invited to excavate a dino on a property. I was quite unsure what I was dealing with until I got there. Aside from the fact this was my first real foray into that part of Hell Creek territory there was a lot that wasn't clear; how well preserved was it? Is it better left to left professional hands? Was it within my ability to excavate (how was the rock, how large was it, etc.). Because of all this I ended up making the 4.5 hour drive to Bowman County with the simple expectation of scouting and seeing wh
  10. Dakotaraptor steini was found in a multi-species bonebed in the Hell Creek Formation and lots of questions have been raised around this material since it was described. Elements of the holotype were found to belong to a turtle (furcula) and Anzu (Tibia) and questions raised on others. To make matters worst the holotype is not available for study.. So its been shrouded in controversy. A good review of where we currently stand is presented in the attached Twitter thread
  11. Hi all, thanks to @Troodon and his wonderful guidance I felt confident to purchase my first fossil claw. Now after thorough cleaning and proper documentation I wanted to get your input on a possible ID. The claw was found in the Hell Creek Fm., Garfield County, Montana. It's 1,82 cm (0.72'') in length and as you can see some of the tip is missing. The ventral surface is a bit flat so I guess it's not a Dromaeosaurid, but it also does not look like Anzu to me, but I am a claw-novice. Thanks for taking a look!
  12. I urge caution to all collectors buying or trading from dealers, diggers or fellow collectors. Most collectors, diggers or dealers are honest and trustworthy but not all have a firm handle on identification and I'm seeing this situation worsening not improving. Its not easy even for paleontologists who are trained. I include collectors because like myself, have over the years, been sold misidentified material. So dont trust anything you see offered to you and get it verified. Here is just a sampling of a few items I've run across. Provenance is very important in identi
  13. Edmontosaurus annectens may have been the largest dinosaur in the Hell Creek/Lance Formations not T rex. Here is an article that gets into the specifics. https://thesauropodomorphlair.wordpress.com/2021/02/10/size-of-the-duck-titans/
  14. There are two Tyrannosaurs described in the Hell Creek & Lance Formations, Tyrannosaurus rex and Nanotyrannus lancensis. Teeth from these animals are the number one sought after and coveted item by collectors. I don't understand all the hoopla and prices they command since my friends who I collect with know that I'm not a tooth person and prefer bones and claws. However I've been fortunate to find and acquire a few teeth and will post a several of my nicer ones. My two most favorite T-rex teeth are my biggest and smallest: The Baby (one of the rarest teeth around) is 1 1/8" and w
  15. The virus put a damper on my Spring dinosaur collecting trip but I was able to get a partial one in for the Fall. I was able to spend several days at my usual Edmontosaurs bonebed but unfortunately only one day at a channel deposit in Montana where theropod/mammal material can be found. Hopefully next year will be more normal, Hopefully. Quite a few new members since my last trip so I will get into more specifics to get them a view of how I collect this material. First let me share with you a view of the collecting area and the LOCAL wildlife that we deal with on a
  16. For Pachycephalosaurid lovers this paper documents the morphology & ontogeny from +20 specimens of Sphaerotholus buchholtzae. It also evaluates the systematics to show that it's a distinct and valid genus in the Hell Creek Formation along with Pachycephalosaurus wyomingensis. https://academic.oup.com/zoolinnean/advance-article-abstract/doi/10.1093/zoolinnean/zlaa179/6125117
  17. Squirrelman91

    Hell Creek Claw ID - Dakotaraptor?

    Hi everyone! I have a large claw from the Hell Creek Formation of Harding County, South Dakota that I was hoping to have help identifying. It is large enough that I initially believed it stood a chance at being tyrannosaurid, but it seems a bit more compressed than tyrannosaur claws I’ve worked with in the past - particularly on the lower ridge. The ventral surface of the claw is also distinctly flat rather than rounded, which seems unusual. Could this be a Dakotaraptor claw or is that just wishful thinking? Large Anzu perhaps? It is right around 1.75 inches across the length of the claw (sorr
  18. Hi all, I came across this Ceratopsian tooth from the HC Fm. online and was wondering what you make of the 'wear facet' on the root? Did this occur naturally in the jaw while the tooth got disposed of? I have not seen this before so I am curious Thanks in advance!
  19. Calcanay

    Hell Creek vertebra

    Hello! I got this dinosaur vertebra from Hell Creek (Montana) a few years back. It was sold to me as a Triceratops vertebra but I don't know how that ID was made. It's not in the best condition (has moss(?) on it and has been broken and then glued back together) but it is about 13-14 centimetres across so it is clearly from a big dinosaur, but there were plenty of those in Hell Creek (even two large ceratopsids - Triceratops and Torosaurus). Looking for any insight into how an ID could be made here and if Triceratops (or even just ceratopsid) is correct
  20. ThePhysicist

    T. rex posterior dentary tooth

    From the album: Dinosaurs

    A high-quality replica of Stan's posterior right dentary tooth. About 4.5" in length.
  21. ThePhysicist

    Nanotyrannus serrations

    From the album: Dinosaurs

    Distal serrations of a juvenile Nanotyrannus lancensis (Hell Creek Fm., Dawson Co., MT).
  22. ThePhysicist

    Baby Tyrannosaurus rex Tooth

    Identification: Originally listed as a Dromaeosaurid tooth, I suspected it was from a Tryannosaurid. Upon receiving the tooth, I contacted a few paleontologists to get expert opinions. Their conclusion was that the tooth was likely from a baby/juvenile Tyrannosaur. Since the only Tyrannosaurs in the Hell Creek Formation are Tyrannosaurus rex and Nanotyrannus lancensis (or only T. rex if N. lancensis is a young T. rex), and considering the cross-section of the base of the tooth, this must be from a baby Tyrannosaurus rex. This tooth shares many qualities with adult teeth, a fact which
  23. ThePhysicist

    K-Pg Boundary Microtektites

    From the album: Dinosaurs

    K-Pg Boundary Microtektites Hell Creek Formation Garfield Co., MT, USA These aren't fossils, but are relevant to the extinction of the non-avian dinosaurs, pterosaurs, large marine reptiles, and many other species of flora/fauna at the end of the Cretaceous. When a large meteor/asteroid struck the earth ~ 66 mya, it sent molten ejecta across the world. Some of this molten material, sourced from the impact site, was shaped by its trajectory through the atmosphere and cooled into small, glassy droplets. The black blobs you see are those droplets, called tektites
  24. From the album: Dinosaurs

    A juxtaposition of the bases of two juvenile Tyrannosaurid tooth crowns from the Hell Creek Formation. Nanotyrannus: Dawson Co., MT Tyrannosaurus: Carter Co., MT
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