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  1. ThePhysicist

    Leptoceratops juvenile

    From the album: Hell Creek Formation Microsite

    A rooted tooth from a juvenile Leptoceratops, a smaller cousin of Triceratops.
  2. ThePhysicist

    Frog jaw

    From the album: Hell Creek Formation Microsite

    A fragment of a frog jaw, with telltale bumps on the labial surface.
  3. ThePhysicist

    Salamander jaws

    From the album: Hell Creek Formation Microsite

    Salamander jaw fragments. (A) premaxilla; (B) dentary fragments (Scapherpeton?); (C) jaw fragment with intact teeth (Habrosaurus?).
  4. ThePhysicist

    Mussel shell iridesence

    From the album: Hell Creek Formation Microsite

    Mussel shell fragments litter the matrix, so much so that even in the finest grain size it looks to have been laced with glitter. The original shell material that makes them appear iridescent (nacre) is preserved, which makes it somewhat surreal to sort through - as if this dirt was shoveled from a river yesterday. The colors are more vibrant when they’re damp. Unfortunately they are extremely fragile and crumble if you so much as look at them.
  5. ThePhysicist

    Channel weathering effects

    From the album: Hell Creek Formation Microsite

    Illustration of pre-fossilization channel weathering effects: physical and chemical. River action physically tumbles and erodes details and sharp features, the acidity of the water may chemically erode surfaces, causing pitting. A) Trionychid turtle shell; B) holostean fish (Cyclurus) maxilla.
  6. ThePhysicist

    Galagadon shark discovery

    From the album: Hell Creek Formation Microsite

    Under the microscope, one may find these tiny treasures - microscopic shark teeth! They are uncommon and require a lot of effort to find.
  7. ThePhysicist

    Bone pebbles

    From the album: Hell Creek Formation Microsite

    Some bones are so river tumbled that they become rounded, even to a near-polish in some cases, and are referred to as “bone pebbles” in the literature.
  8. ThePhysicist

    Bone bits

    From the album: Hell Creek Formation Microsite

    The vast majority of what I find looks like this - chunks of bone and fish bits. In leaving “no stone unturned”, I’ve picked out thousands of pieces of this stuff just to recover a handful of exquisite specimens.
  9. ThePhysicist

    Pectinodon identification

    From the album: Hell Creek Formation Microsite

    Identifying features of the troodontid, Pectinodon. The illustration is the holotype, adapted from Carpenter 1982, the color image is a specimen in my collection. These are thought to be anterior dentary teeth; medial/posterior positions lack the lingual pitting, and may have fine serrations at the base of the mesial carina. Carpenter, K. (1982). "Baby dinosaurs from the Late Cretaceous Lance and Hell Creek formations and a description of a new species of theropod". Contributions to Geology, University of Wyoming. 20 (2): 123–134.
  10. ThePhysicist

    Pachycephalosaurid tooth

    From the album: Hell Creek Formation Microsite

    A river-tumbled pachycephalosaurid medial (cheek) tooth. Illustration adapted from Fanti & Miyashita 2009. Fanti, Federico and Miyashita, Tetsuto. “A high latitude vertebrate fossil assemblage from the Late Cretaceous of west-central Alberta, Canada: evidence for dinosaur nesting and vertebrate latitudinal gradient.” Palaeogeography, Palaeoclimatology, Palaeoecology 275 (2009): 37-53.
  11. ThePhysicist

    Champsosaurus

    From the album: Hell Creek Formation Microsite

    Typical Champsosaurus teeth, highlighting distinguishing features. These are commonly confused for gar fish teeth, and similarly Melvius teeth are often confused for Champsosaurus.
  12. ThePhysicist

    Hell Creek collage

    From the album: Hell Creek Formation Microsite

    A representative sampling of the diversity captured in microsites - everything from Tyrannosaurus to mollusks.
  13. ThePhysicist

    Shed hadrosaurid teeth

    From the album: Hell Creek Formation Microsite

    Typical shed hadrosaurid (Edmontosaurus) teeth, a.k.a. "spitters." Most are river tumbled and missing their enamel. These teeth are quite common, as Edmontosaurus was abundant and regularly shed them from its arsenal of hundreds. A) teeth in occlusal view
  14. ThePhysicist

    Mussel "Unio" shells

    From the album: Hell Creek Formation Microsite

    Unionoid mussels are very common in this riverine deposit. They preserve the original nacre and are iridescent. Because they are so fragile, and given they were preserved in a river, they are never complete.
  15. ThePhysicist

    Acheroraptor tooth

    From the album: Hell Creek Formation Microsite

    Acheroraptor was a small theropod (dromaeosaurid) "raptor" that lived in the same paleo-ecosystem as T. rex. Its blade-like serrated teeth possess diagnostic apicobasal ridges.
  16. ThePhysicist

    Gar scales

    From the album: Hell Creek Formation Microsite

    Gars are predatory fish, armored with diamond-shaped scales coated in a hard enamel-like substance.
  17. ThePhysicist

    Myledaphus teeth

    From the album: Hell Creek Formation Microsite

    Myledaphus (a guitarfish/ray) teeth are quite common, as expected for a riverine deposit.
  18. ThePhysicist

    Ossified tendons

    From the album: Hell Creek Formation Microsite

    Sections of ossified tendons from ornithischian dinosaurs. Especially in an energetic channel environment, these fragile structures are broken into pieces. You’ll notice the surfaces and ends of several of these are rounded from river transport prior to final deposition.
  19. ThePhysicist

    Hell Creek "gold"

    From the album: Hell Creek Formation Microsite

    A fragmented piece of fiery orange amber. Most amber from the HCF is quite small, this one was only a few mm in diameter
  20. ThePhysicist

    Edmontosaurus tooth discovery

    From the album: Hell Creek Formation Microsite

    A large hadrosaurid (Edmontosaurus annectens) dentary tooth, recovered from a channel deposit in Montana.
  21. ThePhysicist

    Holostean fish scales

    From the album: Hell Creek Formation Microsite

    Cartoon illustrating differences between lepisosteid and other holostean ganoid scales.
  22. Oklahoma State University, student discovers new dinosaur species, publishes findings Oklahoma State University, Sara Plummer , January 24, 2024 Paleontologists Discover New Species of Oviraptorosaur in South Dakota Jan 25, 2024 by Sergio Prostak The open access paper is: Atkins-Weltman, K.L., Simon, D.J., Woodward, H.N., Funston, G.F. and Snively, E., 2024. A new oviraptorosaur (Dinosauria: Theropoda) from the end-Maastrichtian Hell Creek Formation of North America. Plos one, 19(1), p.e0294901. Yours, Paul H.
  23. ThePhysicist

    Juvenile T. rex

    From the album: Hell Creek / Lance Formations

    Tyrannosaurus rex Hell Creek Fm., Garfield Co., MT, USA This is from the right maxilla of a juvenile individual (note the lingual wear). Art by RJ Palmer
  24. ThePhysicist

    Acheroraptor tooth

    From the album: Hell Creek / Lance Formations

    A small Acheroraptor tooth with diagnostic longitudinal ridges. Found in a channel deposit.
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