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Found 86 results

  1. Left Side (Tyrannosaurus Rex)

    From the album Tyrannosaurus Rex

    66.8 - 66 mya, Hell Creek Formation, Garfield County, Montana, 3.75 inches on the edge and 3.28 inches straight
  2. Hello, I have a crocodile maxilla from Hell Creek Formation of Montana. It is 6.23 inches long, and has planted Borealoschus/Leidyosuchus teeth in it, though I do not know how many teeth are original. Any ideas to the genus/species?
  3. Can someone help me identify this bone? It is a toe bone from the Hell Creek Formation. The location is Carter County, Montana.
  4. 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 Ankylosauridae and Nodosauridae. Ankylosaurids are the brutes with big tail clubs. Nodosaurids have no clubs but are fierce looking with big spikes projecting from its sides. You don't want to meet up with either family. So when these teeth come up for sale most are very worn and it can get difficult to ID, so if possible avoid buying those. There is also a variation in the teeth with jaw position. Wear facets are also very common on these teeth. My photographs show complete teeth that have little wear so you can see what they typically should look like. Let me call them your generic teeth and are good representation of these families. There are multiple genus that you run into and the species is dependent on what formation you are in, see below with what is currently understood. Some have yet to be described to a species level due to lack of skeletal remains but teeth are plentiful. Differentiating teeth between the two families is quite easy. For Ankylosaurids crowns are small with long roots with two key characteristics, a bulbous base, see white arrow and a prominent central ridge on SOME species like Ankylosaurus in the Hell Creek others it covers the entire face of the crown. Other examples of North American Ankylosaurids Nodosaur Teeth: Are much larger, both taller and wider than Ankylosaurids, a shelf is visible below a pocket in the crown, no center ridge. Looks like a mit. Hell Creek Formation Two Medicine Fm Undescribed Nodosaur Judith River FM If you are interested in additional reading let me suggest Dinosaur Systematics by Ken Carpenter. Its also a good book describing theropod teeth. Our current understanding of species described: based on the revised analysis by Paul Penkalski, 2018. These views might not be share by some paleontologists but thats normal. Let me also say that with new discoveries and research some of this is subject to change. Hell Creek and Lance Formation Ankylosaurus magniventris (Ankylosaurid) Denversaurus schlessmani (Nodosaurid) Judith River Formation Zuul crurivastator (Ankylosaurid) Undescribed Nodosaur Two Medicine Formation Oohkotokia horneri (Ankylosaurid) Edmontonia rugosidens (Nodosaurid) Dinosaur Park Formation Euoplocephalus tutus (Ankylosaurid) Anodontosaurus lambei (Ankylosaurid) Platypelta coombsi (Ankylosaurid) Scolosaurus thronus (Ankylosaurid) Dyoplosaurus acutosquameus (Ankylosaurid) Edmontonia rugosidens (Nodosaurid) Panoplosaurus mirus (Nodosaurid) Horseshoe Canyon Formation Anodontosaurus lambei (Ankylosaurid) Edmontonia longiceps (Nodosaurid) Oldman Formation Scolosaurus cutleri ? (Ankylosaurid) Undescribed Nodosaurid Revised systematics of the armoured dinosaur Euoplocephalus and its allies Paul Penkalski https://www.researchgate.net/publication/323579149_Revised_systematics_of_the_armoured_dinosaur_Euoplocephalus_and_its_allies
  5. Albertonykus borealis was theropod described by Philip Currie and Nicholas Longrich in 2008 from the lower Maastrichtian of the Horseshoe Canyon Formation in Alberta. Its range also extends into Montana, SD and Wyoming in the Hell Creek and Lance Formation. It is noted for having a single hand claw and is a very small theropod, see photo. Very few folks pay attention to small dinosaurs but this one is very cool and material does come out all of the time so I thought it might be interesting to post. If you collect North American dinosaurs the claws are a must have. Teeth have been found on its Asian cousin Mononykus olecranus but no cranial elements to my knowledge have been found in North America. Maybe one of our forum members can find one or has more information to add. Material found in the Hell Creek and Lance formation should be labeled as cf Albertonykus borealis since nothing has been described from these localities. I've seen hand and foot claws as well as phalanges sold but few sellers know what they have and label them theropod. I've personally collected some specimens and have purchased others. Published literature and the New York Museum of Natural History Mononykus display help pull the picture together for identification of specimens. Hand Claw : They are typically recurved but can be straight. A shallow vascular groove on either side, ventral foramens are present, see second photo (arrow) Carpal : Called the Alular digit and just has one. Photos L to R Medial, Ventral and Dorsal Views Associated Alular Digit : Foot digits in the following post.
  6. T-Rex (CGtalk) by Aleksander Popov Few feelings can describe the awe of holding a Tyrannosaurus Rex tooth in your hand, knowing this was the killing weapon of one of the mightiest predators ever to walk the Earth. Of course, like many of you, it has always been my dream to own a large T-Rex tooth. After years, I've finally managed to obtain one from an adult. The looks of wonder on the children's faces when I unveil this tooth just make you appreciate just how important dinosaurs are to the imagination of kids and adults alike. There is no finer fossil in my collection, nor any I love as much (nor any as expensive, but that's to be expected haha). This tooth measures 3 3/4 inches on the leading curve, and 1 3/8 inches in width. There is minor crack filling, but no other restoration. This has been authenticated by the University of Maryland, and the pictures have been shown to accredited experts like Tom Kapitany, Vanessa Weaver and George Corneille. All agree, this is the real deal. I will let the pictures speak for themselves. ______________________________________________________ Tyrannosaurus Rex mandible tooth Hell Creek Formation Garfield County, Montana, United States of America Late Cretaceous period - 66.8 - 66.0 million years old ______________________________________________________
  7. Hi everyone, Here is another mystery fossil we found last June while on a Forest Service dig in South Dakota. It was found in an area that we think was once a shoreline, since the matrix ranged from sandy to iron-rich conglomerate layers with both aquatic (rays, gars, turtle, etc.) and terrestrial fauna (hadrosaur, T. rex, thescelosaur, etc.). Our best guess is some kind of seed, but we really have no clue. I forgot to take measurements when I was at the lab and no longer have ready access, so I apologize in advance. It is pretty small - you should be able to get an idea of the size from the adjacent Xacto knife (8 mm dia.).
  8. Hell Creek Mystery Teeth

    Here are a couple of mystery teeth we found in the Hell Creek Formation in South Dakota. Any ideas?
  9. What In The Hell Creek Is It?

    Just got back from a dig in the Hell Creek formation. Everything from Hadrosaur, ray teeth, champsosaur verts, gar scales, turtle, ceratopsian frill and theropod teeth were in the immediate area of this bone. We will be heading to the lab in the morning to begin prep, but I was just wondering if any of you seasoned experts might have any idea what this is. Everything was pretty jumbled and most of the bone in the area we were digging was pretty degraded (more like coffee grounds), but this was one of the few in decent shape that seemed to be diagnostic. I will post better pics once it is prepped.
  10. i am going on a trip to montana and alberta in june and i am wondering if there are any localities where i can collect dinosaur fossils. please include directions and type of fossils found there.
  11. Well, just finished up a whirlwind pair of digs in South Dakota and Montana. I went dinosaur fossil hunting in the Hell Creek Formation at two sites: the first just northeast of Newell, South Dakota, and the second northeast of Jordan, Montana, right below Fort Peck lake. I had great weather; mostly 90-110 degrees F, low humidity and windy. The digs were very productive at both sites with many dinosaur teeth, turtle/croc scutes, dinosaur ribs and vertebra uncovered. Below are some of the better finds from South Dakota: 4+ inch T rex tooth uncovered by the group (good serrations and an intact tip) One of my finds, a complete 9 inch Thescelosaur ulna From Montana, we re-opened an old site and after pushing back some hillside we found a large depost of dinosaur bone material: Starting to uncover a probable triceratops vertebra And my favorite find, a triceratops rib that took me 3 days to dig out (with interesting breaks in the head and towards the distal end...note other partial ribs around it...) All in all, it was a great trip this year. Lance