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Found 6 results

  1. Ever wonder which Jurassic dinosaurs in the Morrison Formation were most abundant? Well at least those collected. Dr Susie Maidment posted this on twitter "Hey Morrison Formation fans! Ever wondered what the most abundant dinosaurs in the formation were, based on PBDB data? I did, and I plotted it" Looks like the winners were, no surprise Sauropod: Camarasaurus Theropod: Allosaurus Ornithischians: Stegosaurs
  2. Consolidated all my informational Topics to make it easier to reference. Will keep updating since some of the reference material is outdated. Have to thank @PFOOLEY for suggesting this consolidation and it makes it a lot easier for me to access these topics as well as our members to know what's out there. General Tips in Buying Theropod Teeth Dinosaur Anatomy 101 Stratigraphy of the Late Cretaceous in North America Best Books for Dinosaur Identification Rare Theropod Teeth (World Wide) Identification of Some rarer Theropod Teeth Triassic Identification of Dinosaur Teeth from the Triassic of New Mexico Jurassic: Morisson Formation Identification of Theropod Teeth Quick Guide To Sauropod Teeth Tips in Buying a Sauropod Foot Claw Ornithischians from the Morisson Formation Jurassic: Europe Dinosaurs of Costal Portugal Jurassic Theropods of Germany Cretaceous: USA Hell Creek & Lance Formation Fanual List Identification of Theropod Teeth in the Hell Creek and Lance Formations Identification of Troodontid Teeth Identification of Tyrannosaurid Teeth From USA & Canada Identification of Ankylosaurid Teeth Identification of Acheroraptor Teeth Identification of Hadrosaur Teeth Identification of Claws and Ungals from the Hell Creek and Lance Formations Identification of Pachycephalosaurid and Thescelosaurus Teeth Tooth Features in Tyrannosaurids The Case for Nannotyrannus Dakotaraptor Teeth and Claws Hell Creek Fm Identification of Bones /Claws from Alvarezsaurids from North America Hell Creek Faunal Representation Identification of Theropod Teeth from Judith River Formation ( Campanian ) Includes Faunal List Fanual List from the Two Medicine Formations . Theropod Assemblage of New Jersey Cretaceous: Kem Kem of Morocco Kem Kem Theropod Teeth Kem Kem Theropod Tooth Morphology Identification of Sauropod Teeth from the Kem Kem Tips in Purchasing a Spinosaurid Hand Claw Identification of Claws from the Kem Kem Identification of Spinosaurid Jaws from the Kem Kem Guide to Help Purchase Rooted Moroccan Theropod Teeth Pterosaur Teeth from Kem Kem Republic of Niger Identification of Theropod Teeth Thailand Identification of Spinosaurid Teeth Cretaceous: South America Patagonia's Theropod Teeth Cretaceous: Uzbekistan: Identification of Theropod Teeth: Uzbekistan Sauropod Teeth: Uzbekistan Cretaceous: Europe Identifying Baryonyx Teeth
  3. Hi Fossils Preparation Fans, Last week I received 1900kg of unprepared dinosaur bones in plaster jackets. Now my neigborhood thinks I lost my mind and I received a lot of eye-rolling from my wife. However, my two sons (7y and 2.5y old dino fans) and myself think it was an excellent idea to acquire the material. The fossils have been collected in the upper layers of the Morisson Formation. Location: Moffat County, Colorado As always when buying unprepared dinosaur bones you do not really know what you get. However, it seems that most material is Apatosaurus (or some other Diplodicoidea) with some small pieces which are likely Allosaurus. I will know more after I started preparing the material. The bone quality and completeness of the bones is ranging from very good to poor according to the seller (what that means I will find out soon). Anyway, this will keep me busy for one or two years. If there is interest I will post a picture once in a while.
  4. I periodically get asked about theropod teeth, so this is what I know. If you have additional tooth related information please pass it on since very little is known or published. Tanycolagreus topwilsoni The holotype included a fragmented skull with one premaxillary and two lateral teeth. Unfortunately, the teeth were crushed with no visible serrations so it's unknown how to describe them. Holotype skull Koparion douglassi Oldest known Troodontid and only known from a single maxillary tooth. Pictures says it all. A tooth taxon! Scale: A 1 mm, B-F 100 micrometers Chure, D. J. (1994). "Koparion douglassi, a new dinosaur from the Morrison Formation (Upper Jurassic) of Dinosaur National Monument; the oldest troodontid (Theropoda: Maniraptora)." Brigham Young University Geology Studies, 40: 11-15 Hesperornithoides miessleri A new Troodontid. The serrations on the mesial carinae of maxillary teeth are smaller than the distal serrations as in basal dromaeosaurids. Mesial serrations are restricted to the apical third of the crown and appear absent in some teeth. Serrations are small (5.5 per mm distally). The teeth are labiolingually compressed, and the enamel shows no trace of longitudinal grooves. Unfortunately the paper does not identify the sizes of these teeth. Distal Serration Density 5.5/mm FABL: around .45 https://peerj.com/articles/7247/ Coelurus fragilis Known from a fairly complete skeleton however there is a question if the dentary, below, belongs to the skeleton. No teeth were recovered and cannot find any additional information on teeth. Ken Carpenter recently responded to my inquiry about these teeth. He stated that we have no teeth from this dinosaur. Teeth have been called Coelurus because they are small but there is no proof of association Carpenter, K., Miles, C., and Cloward, K. (2005). "New small theropod from the Upper Jurassic Morrison Formation of Wyoming." in Carpenter, K. 2005. The Carnivorous Dinosaurs, Indiana University Press: 23-48 Ornitholestes hermanni Skull with both mandibles are part of the holotype. Osborn et. al (1917) paper just comments that the teeth are small and feeble. Carpenters book mentions that the skull is presently being studied by Mark Norell. C. Hendrickx 2019 paper shows some data on these teeth which I present here, 11 teeth were included in this study. Although very little is known with these teeth here is some data taken from AMNH holotype skull. Looks like the serrations are extremely fine. Maxillary teeth CH range from: 3.1 to 6.5 mm Dentary teeth CH range from: 3.9 to 5.6 mm Crown Height Ratios : 1.5 to 2.3 Crown Base Rations : 0.52 to 0.8 Interdental Sulci: Absent Transverse Undulations: Absent Serration density : Distal serrations were present on two teeth: a Maxillary Tooth 50/ 5/mm and Dentary Tooth 60/ 5mm Carpenter, K., Miles, C., and Cloward, K. (2005). "New small theropod from the Upper Jurassic Morrison Formation of Wyoming." in Carpenter, K. 2005. The Carnivorous Dinosaurs, Indiana University Press: 23-48 Reconstructed Skull AMNH Osborn, Henry Fairfield (1917). "Skeletal adaptations of Ornitholestes, Struthiomimus, Tyrannosaurus". Bulletin of the American Museum of Natural History. 35 (43): 733–771. hdl:2246/1334. Allosaurus fragilis (updated 6/19/22) Very little is published to aid in identification of these teeth. A recent paper by C. Hendrickx provided information on 60 teeth included in his study that I present in this edit. The following information is needed to help identify these teeth From Study: Premaxillary Positions: Serration Density: DSDI: 0.83 to 1.05 (Average : 0.98) Distal Density: 9.5 to 12.5 / 5 mm (Average : 10.3/ 5mm) Mesial Density: 8.3 to 11 .3 / 5 mm (Average : 10.1/ 5 mm) Other characteristics: Transvers Undulations: Can be present Interdental Sulci: Can be present Maxillary Positions: Serration Density: DSDI: 0.8 to 1.1 (Average : 0.95) Distal Density: 10 to 17.5 / 5 mm (Average : 12.5/ 5mm) Mesial Density: 9.5 to 14.0 / 5 mm (Average : 11.9/ 5 mm) Crown Height Ratio CH / CBL : 1.7 to 2.2 (Average : 2.1) Crown Base Ratio CBW / CBL : 0.37 to 0.8 (Average : 0.57) Other characteristics: Transvers Undulations: Can be present Interdental Sulci: Can be present Dentary Positions: Serration Density: DSDI: 0.91 to 1.3 (Average : 1.08) Distal Density: 10 to 13.75 / 5 mm (Average : 12.0/ 5mm) Mesial Density: 10 to 16.25 / 5 mm (Average : 13.1/ 5 mm) Crown Height Ratio CH / CBL : 1.8 to 2.5 (Average : 2.2) Crown Base Ratio CBW / CBL : 0.7 to 1.1 (Average : 0.86 ) Other characteristics: Transvers Undulations: Can be present Interdental Sulci: Can be present Unknown Positions: Serration Density: DSDI: 0.87 to 1.4 (Average : 1.07) Distal Density: 9 to 13.5 / 5 mm (Average : 11.4/ 5mm) Mesial Density: 8.8 to 17.5 / 5 mm (Average : 11.9/ 5 mm) Crown Height Ratio CH / CBL : 1.75 to 2.3 (Average : 2.2) Crown Base Ratio CBW / CBL : 0.46 to 1.1 (Average : 0.73 ) Other characteristics: Transvers Undulations: Can be present Interdental Sulci: Can be present Base shape can assist in identification. They can be J shaped The morphologically space occupied by Allosaurus is also seen by Ceratosaurus Poster with these illustrations Testinet.al.2011Poster.pdf cf Aviatyrannus Zone 2 South Dakota Not much is known on the teeth, its a tyrannosauroid Stokesosaurus clevelandi Zone 5 Utah late Kimmeridgian-early Tithonian Not much is known on the teeth, its a tyrannosauroid Saurophanganax maximus Zone 5 Oklahoma late Kimmeridgian- early Tithonian Allosaurid - might be an adult Allosaurus- teeth should be the same as one Torvosaurus Ceratosaurus Marshosaurus Reconstruction Skull of Marshosaurus from Utah Museum of Natural History. So you can see variation of the teeth in jaw
  5. Kikokuryu

    Ceratodus sp.

    Stabilized with Butvar B-76. Found in a basal channel facies associated with an incised valley-fill sequence of fluvial sediments; found in situ from a channel-sand-bed-load layer near the base of the valley-fill sequence. Edit: So, I copy pasted that from my power point I use to catalogue my fossils. Not sure how to remove the boxes.
  6. Ceratosaurus is one of my favorite Jurassic theropod Dinosaurs found in the Morrison Formation. Teeth of this and other theropods are commonly sold through online Dealers, Auction Houses and at Fossil shows. Just because a site/dealer sells Jurassic material does not guarantee the are accurately identified. Variation of the teeth in the jaw also adds to the complexity. Isolated teeth from the Morrison Formation are very difficult to diagnose and all require an understanding of additional characteristics than normal, in hopes of properly identifying them. Some publications describe the anterior teeth which is shown below.. This Latest edit is driven by C Hendrickx 2019 paper which shows some data on these teeth which I present in this edit. The following information is needed to identify these teeth: 1)Photo of tooth all sides and base and one of the mesial edge 2)Serration density of both edges, 5 mm wide at midline 3)Dimensions: CBL, CBW, CH 4)Locality: State and County Premaxillary Position (From Morrison Fm) (Data from 10 Teeth Hendrickx study) Crown height ratio CH÷CBL CHR : 1.2 to 1.9 (Avg 1.7) Crown base ratio CBW÷CBL CBR : 0.57 to 0.78 (Avg 0.66) Serration Density: DSDI 0.9 to 1.8 (Avg 1.35) Distal : 7 to 9 / 5 mm Mesial: 9 to 12.5 / 5 mm Other Characteristics Cross-section base : Subcircular Mesial Carina NOT reaching the base in most crowns Lingual grooves (flutes) are diagnostic and on the lingual side only. Transverse Undulations: May be present on the lingual side Interdental Sulci: Weak to absent Lateral Dentary Positions (From Morrison Fm) (Data from 9 Teeth Hendrickx study) Crown height ratio CH÷CBL CHR : 1.7 - 1.9 (Avg 1.8) Crown base ratio CBW÷CBL CBR : .035 to 0.5 (Avg 0.44) Serration Density: DSDI .09 to 1.1 (Avg 1) Distal : 11.5 to 13 / 5 mm Mesial: 10 to 12.5 / 5 mm Other Characteristics Mesial serrations extend to the base on most crowns Transverse Undulations: light present on distal teeth Interdental Sulci: unknown Anterior Dentary Positions Gooves are present on the lingual side of the three anterior teeth Lateral Maxillary Positions (From Morrison Fm) (Data from 11 Teeth Hendrickx study) Crown height ratio CH÷CBL CHR : 1.8 - 2.3 (Avg 2) Crown base ratio CBW÷CBL CBR : .032 to 0.6 (Avg 0.42) Serration Density: DSDI .097 to 1.2 (Avg 1.06) Distal : 9 to 12 / 5 mm Mesial: 9 to 12.8 / 5 mm Oher Characteristics Mesial carina extend to the base on most crowns Transverse Undulations: can be light present Interdental Sulci: can be present If you would like to learn more about Ceratosaurs, bones and teeth there is a great soft covered printing. Ceratosaurs (Dinosauria, Theropoda) A Revised Osteology by Madsen and Welles by the Utah Geological Survey Its also available on PDF but the book is cheap and a great reference guide. If anyone has additional information to add to this please post it. Reconstruction Skull of Ceratosaurus from Utah Museum of Natural History. So you can see variation of the teeth in jaw Reference 1)Journal of Iberian Geology June 2017, Volume 43, Issue 2 , pp 257-291 Analysis of diversity, stratigraphic and geographical distribution of isolated theropod teeth from the Upper Jurassic of the Lusitanian Basin, Portugal 2)Multivariate and Cladistic Analyses of Isolated Teeth Reveal Sympatry of Theropod Dinosaurs in the Late Jurassic of Northern Germany Oliver Gerke, Oliver Wings Published: July 6, 2016 https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0158334 3) Taxonomic identification of isolated theropod teeth: The case of the shed tooth crown associated with Aerosteon (Theropoda: Megaraptora) and the dentition of Abelisauridae ChristopheHendrickx, EmanuelTschopp, Martín d.Ezcurra https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0158334
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