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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

    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.
  10. 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.
  11. 1.75-Billion-Year-Old Fossils Are Oldest Record of Oxygenic Photosynthesis The preserved structures show a process that gave rise to life as we know it. By Isaac Schultz, GIZMODO, January 3, 2023 Photosynthesis Evolved as Early as 1.75 Billion Years Ago, Microfossils Suggest Jan 3, 2024 by Enrico de Lazaro. SciNews The paywalled paper is; Demoulin, C.F., Lara, Y.J., Lambion, A. et al. Oldest thylakoids in fossil cells directly evidence oxygenic photosynthesis. Nature (2024). Yours, Paul H.
  12. ThePhysicist

    Myledaphus pustulosus

    From the album: Hell Creek / Lance Formations

    A pile of hundreds of small Myledaphus teeth, recovered from a channel deposit in Montana.
  13. Hello again! I haven't posted in a while, but I've been keeping busy looking through microfossils and have found some cool things. The scalebar subdivisions are 1mm. Let me know what you think about this haul, and any other ideas on IDs. Miguel M Some fish jaws: (Anguiliform dentary?) (drum pharyngeal jaw) Some fish vertebrae and basioccipital Random fish teeth (maybe a scombriform?) (Some other fish teeth. Leftmost could be a sheepshead incisor, no idea as to the others) Elasmobranch teeth (skate teeth) (The one to the right looks very interesting)
  14. Early Cambrian microfossils preserve introvert musculature of cycloneuralians The open access paper is: Zhang, H., Xiao, S., Eriksson, M.E., Duan, B. and Maas, A., 2023. Musculature of an Early Cambrian cycloneuralian animal. Proceedings of the Royal Society B, 290(2008), p.20231803. Yours, Paul H.
  15. ThePhysicist

    Amber droplet

    From the album: Hell Creek / Lance Formations

    A small droplet of amber found within an organic-rich layer in laminated siltstone.
  16. ThePhysicist

    Galagadon

    From the album: Hell Creek / Lance Formations

    A mm-sized shark tooth recovered from a channel deposit.
  17. ThePhysicist

    Gastropod

    From the album: Hell Creek / Lance Formations

    A mm-sized gastropod recovered from a channel deposit.
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