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Found 14 results

  1. Paper reassess the previous referral of specimens to Rubeousaurus ovatu and determines it represents a new centrosaurine taxon, Stellasaurus ancellae in the Two Medicine Formation in Montana https://royalsocietypublishing.org/doi/full/10.1098/rsos.200284 Artwork by AndreyAtuchin Nasal horn
  2. Hi all, I am looking for the following publication: Mongelli & Varricchio. 1998. Theropod teeth of the lower Two Medicine Formation (Campanian) of Northwestern Montana. JVP. 18: 65A In particular I am looking for a description of Dromaeosaurus sp. and Dromaeosauridae indet. mentioned in Weishampel. 2004. The Dinosauria. Thanks for your help. JoeS
  3. 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 identification ALWAYS request Formation, State or Province and very important County or Town if in the States or City/Area if Alberta. I see lots of genus/species names being assigned to Ceratopsian or Hadrosaurian bones. Other than Edmontosaurus from the Hell Creek or Lance formations its extremely difficult to assign names to any post cranial material from these families. There are just to many named or yet to be named species from Campanian deposits of formations like Aguja of Texas and the Judith River & Two Med Formations of Montana not to mention Canada. Theropod teeth especially Jurassic ones are very hard to distinguish between one another, photos are just not adequate to validate them. Serration counts and dimensions are needed to try to properly assign them. So request it from the seller. Some real life examples: Very nice Metatarsal listed as a Lambeosaurus from the Hell Creek Fm, Jordan, Montana. Species does not even exist in the HC. Its Edmontosaurus This beautiful vertebra is being listed as a caudal of a Carcharodontosaurus sp., a great collector piece. The description states that the ball and socket indicated how far the tail could swing. Unfortunately the seller is looking at the wrong end of the dinosaur. To me it looks like a cervical vertebra of a Spinosaurid. I did advise the seller a few days ago and he did say a change would be made and the listing has been corrected. Here is a photo of a Sigilmassasaurus for you skeptics This type of tooth from the Kem Kem is an indeterminate Abelisaurid not a RAPTOR, not a Dromaeosaur, not a Deltadromeus Very nice femur being listed as Pachycephalosaurus, its Thescelosaurus .. Very nice rooted tooth being listed as Torosaurus, its a Ceratopsian tooth. There is no way to distinguish Torosaurus teeth from all the other large bodied ceratopsian in the Hell Creek Fm other that if it was found with an identifiable skull. This claw was sold as Troodon from the Judith River, to me it looks like Caenagnathidae This is being listed as a first phalange Toe bone of a tyrannosaur Daspletosaurus. Its a metatarsal of an indeterminate Tyrannosaurid either Daspletosaurus or Gorgosaurus. Unless it was found with some Daspleto diagnostic material, difficult to tell them apart. Seller was advised a long time ago, no changes made. A Daspletosaurus tooth is listed from the Judith River Fm...beautiful tooth but one cannot distinguish teeth between teeth of Tyrannosaurids and Daspletosaurus sp. although assumed to be present its yet to be described from JR deposits
  4. Hey everyone! In this post im going to be sharing two teeth from my collection. The first one was sold to me as acheroraptor. Its from the Hell Creek formation in MT and its CH is 7 mm. @Troodon
  5. Powell county montana

    Hi I was wondering if Powell county Montana is part of the two medicine formation I go a tooth from Powell county and it says it’s hell creek but it looks like it’s in two medicine it’s too west to be hell creek thanks. <Translated for the pre-celltext generation>: Hi, I was wondering if Powell county Montana is part of the two medicine formation? I got a tooth from Powell county and it says it’s hell creek, but it looks like it’s in two medicine: it’s too far west to be hell creek. Thanks.
  6. I have 2 campanian tyrannosaur fossils, one from the Judith river formation from Blaine county in Montana, and another where the only locality I know of is that’s from the two medicine formation. I was wondering if the locality can help determine between Gorgosaurus, Daspletosaurus and Albertosaurus, or if any formations are limited as to which species is present.
  7. My interview for I Know Dino

    I was interviewed about my egg research by Garret and Sabrina who have a Dinosaur focused podcast, strangely enough, called "I Know Dino" and wanted to share. Highly recommend their podcast as they provide a nice weekly recap on Dinosaurs, such as scientific news and less serious funny moments. One major point where I Know Dino stands out compared to most media is a focus on accurately reporting current research. Garret and Sabrina strive to engage with the scientific community, for example, they actually attend SVP. They have interviewed many great paleontologists including Jack Horner, Tom Holtz, Phil Currie, John Scannella, Dave Varricchio, Danny Barta, Cary Woodruff, Ashley Hall, Lee Hall, plus more recently Liz Freedman Fowler and Denver Fowler. Around 55 paleontologists in total to date along with interviews of others who have active dinosaur related projects like making cast of bones or shows for the public. My interview mainly went over dinosaur eggs and the validity of Troodon. Link to the I Know Dino website: https://iknowdino.com/ Link to the episode with my interview: https://iknowdino.com/dromiceiomimus-episode-221/ Link straight to my interview: In a way, I suppose this can count as my fossil Friday post haha. Going to get those who might be interested in actually hearing me or have posted before about eggs, sorry for any spam. @Troodon. @Seguidora-de-Isis . @HamptonsDoc . @-Andy- . @MarcoX. @Crazyhen . @Masp . @abyssunder . @WhodamanHD . @Haravex . @TyBoy . @Tidgy's Dad . @aeon.rocks . @DPS Ammonite . @steelhead9 . @Pemphix . @Still_human . @Pixpaleosky . @bcfossilcollector . @RamenHero . @The Amateur Paleontologist Eric P.
  8. Likely some have already seen this, a nice little video on coprolites, what we can learn from them and their significance. Being a post from me, the video of course covers the Two Medicine Formation, I know at least @GeschWhat will enjoy. https://www.facebook.com/scifrimacroscope/videos/986351528231150/
  9. Tyrannosaurid indet.

    From the album My Collection

    Tyrannosaurid indet. (Likely Daspletosaurus horneri or Gorgosaurus sp.) Two Medicine Formation Browning, Montana
  10. Help ID Bones

    Can anyone ID these bones? They are from the Two Medicine Formation, they have these weird bumps on them which I first thought was skin but it looks like it's part of the bone or whatever it is.
  11. Maiasaura nestling material collected by Jack Horner in 1978 is described in detail. Prieto-Marquez A, Guenther MF. (2018) Perinatal specimens of Maiasaura from the Upper Cretaceous of Montana (USA): insights into the early ontogeny of saurolophine hadrosaurid dinosaurs https://peerj.com/articles/4734/
  12. My new ceratopsian tooth

    Species: Unidentified Age: Late cretaceous Location: Montana Formation: Two Medicine Formation, Judith River Group Size: 0.8"
  13. A new Tyrannosaurid has been described from the Medicine Formation. Daspletosaurus horneri For collectors of dinosaur teeth, there is nothing in the paper that I've yet seen that would distinguish these teeth from other Tyrannosaurid in the Two Medicine Article: http://www.nature.com/articles/srep44942 Paper: srep44942.pdf
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