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Found 13 results

  1. More and more dinosaur material is becoming available from the Two Medicine Formation. I see lots of misidentified material and some with questionable localities that might fit other deposits. I would like to summarize what I believe is currently known and published. If you see any omissions or errors, please let me know Not a lot of good maps out there to show the formation but here are two. The TMF is about 650 meters thick and is the western equivalent of the Judith River Formation. Most of the sediments were deposited in streams, rivers and lakes. It overlies the Virgelle Sandstone and underlies the Bearpaw Formation. More important, for collectors buying material to be aware of the counties that have the majority of exposures they include but not exclusive to: Glacier County, Teton County, Lewis and Clark County and Pondera County Faunal List: 9/13/22 (excludes Avialae) Lots of changes in recent years so older hard copy books are most likely out of date e.g. Dinosauria 2nd edition. This list was developed based on looking at a number of different reference sources, not Wikipedia, and like most lists some paleontologists or collectors may have different opinions, which is fine Tyrannosauridae: - Daspletosaurus horneri (Carr et al. 2017) - Gorgosaurus sp. Dromaeosauridae: - Dromaeosaurus indet. - Saurornitholestes indet. - Bambiraptor feinbergorum (Burnham et al. 2000) Theropods: - cf Troodon formosus - cf Richardoestesia sp. - cf Paronychodon? Ankylosayria: - Scolosaurus cutleri (Nopcsa 1928) - Edmontonia rugosidens (Sternberg 1928) Ceratopsidae: - Rubeosaurus (Styracosaurus) ovatus (Gilmore 1930) - Einiosaurus procurviconis (Sampson 1994) - Achelosaurus hornei (Sampson 1994) - Prenoceratops pieganesis (Chinnery 2004) Hadrosauroidae: - Maiasaura peeblesorum (Horner & Makela 1979) - Prosaurolphus maximus (Brown 1916) - Gryposaurus latidens (Horner 1992) - Hypracrosaurus stebingeri (Horner & Currie 1994) Thescelosauridae: - Orodromeus makelai (Horner & Weishample 1988) Pachycephalosauridae: - Stegoceras sp. Caenaganathidae: - Chirostenotes pergracilis (Gilmore 1924) References: - Dinosaurs under the Big Sky, Jack Horner, 2001 Mountain Press Publishing Co. - Rogers RR. Sequence analysis of the Upper Cretaceous Two Medicine and Judith River formations, Montana: nonmarine response to the Claggett and Bearpaw marine cycles. J Sediment Res. 1998; 68: 615–631. - McDonald AT (2011) A Subadult Specimen of Rubeosaurus ovatus (Dinosauria: Ceratopsidae), with Observations on Other Ceratopsids from the Two Medicine Formation. PLoS ONE 6(8): e22710. doi:10.1371/journal.pone.0022710 - Caleb Marshall Brown , David C. Evans , Michael J. Ryan & Anthony P. Russell (2013) New data on the diversity and abundance of small-bodied ornithopods (Dinosauria, Ornithischia) from the Belly River Group (Campanian) of Alberta, Journal of Vertebrate Paleontology, 33:3, 495-520, DOI: 10.1080/02724634.2013.746229 - Michael J. Ryan , Robert Holmes & A. P. Russell (2007) A revisionof the late campanian centrosaurine ceratopsid genus Styracosaurus from the WesternInterior of North America, Journal of Vertebrate Paleontology, 27:4, 944-962, DOI:10.1671/0272-4634(2007)27[944:AROTLC]2.0.CO;2
  2. The Two Medicine Formation is a late Cretaceous geological formation that was primarily deposited in North Central Montana 84 to 71 million years ago about the same time as the Judith River Formation, See Map - pink area. The Two Medicine is found along the east flank of the Rocky Mountains and represents the upland area of the Cretaceous Seaway while the Judith River Formation represents the lowland area. Although deposited in the roughly the same period the Two Medicine has yielded an amazing list of dinosaurs that are not found in the Judith River. These include Einiosaurus procurvicornis, Maiasaura peeblesorum (Montana's state fossil), Achelousaurus horneri, Bambiraptor feinbergi A good portion of the formation is on Tribal land (Blackfoot Indian Nation) so collecting requires access with Native Americans. I was fortunate not only know a private landowner but a couple of tribal folks. My collection is varied from adults to infant specimens with some being articulated. My first specimen to share is what I believe to be a Euopcephalus sp skull. The very front end is reconstructed so I'm not 100% positive. Around 15" (38cm) Square Condyle Maiasaura peeblesorum A hadrosaur closely related to Brachylophosaurus from the Judith River Fm. An complete articulated arm and shoulder. Has folded its 56" (1.4m) Long. A pair of Unguals - The ventral ridges are diagnostic to this species
  3. Questioningrockbard

    Two Medicine Formation find! Help???

    Could really use help identifying this piece! Found in two medicine formation in southern alberta. Size is 2 inches x 2 inches and 1.5 inches high. It’s quite solid and is coolish to the touch, not at all chalky. thanks for any feedback at all.
  4. Hello, this tooth has baffled me for years. I can't tell if it is a juvenile tyrannosaurid dentary tooth or a cf. Richardoestesia gilmorei tooth Its locality info is Montana, Two Medicine Formation The tooth has a serration density of 19/5mm on the distal mid-line. Unfortunately the mesial carina is worn down so that crucial data is missing The CH is 11.5 mm, CBW is 7 mm and CBL is 4.5 mm As far as I am aware, juvenile tyrannosaurid (with the exception of T. rex) have slender teeth while as this tooth is somewhat robust. Meanwhile, Richardoestesia gilmorei is somewhat of a wastebasket ID for many teeth(likely unrelated species), so this teeth should fall into the range of size and morphology for one May I have your thoughts on this tooth?
  5. Impressive finds continue for Whitefish-based fossil hunters By Jeremy Weber, Daily Interlake, August 1, 2021 Yours, Paul H.
  6. 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
  7. I found this tooth while in Montana! I have no clue what it is. I was told that you guys could help! If you guys need any more information, tell me Found Near Fox Crossing Montana, Judith River Formation. Hill County
  8. 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
  9. 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
  10. LordTrilobite

    Hadrosaur Humerus

    The left humerus of a juvenile hadrosaur. Found near Hamilton. The closest formation is Two Medicine formation. The deltopectoral crest seems fairly robust for such a young animal so I'm leaning towards this being Lambeosaurine instead of Saurolophine, which would make it most likely Hypacrosaurus. The shape also fits quite well with a juvenile Hypacrosaurus I have restored some small areas where there were large holes. But I have left the largest area of damage due to it being a little unclear as to how robust or slender that area would have been.
  11. dinosaur man

    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.
  12. 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.
  13. Jaimin013

    Tyrannosaurid indet.

    From the album: My Collection

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