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  1. JacksonR

    Microfossils

    I dissolved limestone from Michigan in acetic acid and got some interesting things, among them these. The source for the limestone is unsure of their exact age. Ordovician-Devonian. Any ideas?
  2. ThePhysicist

    Leptoceratops juvenile

    From the album: Hell Creek Formation Microsite

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

    Frog jaw

    From the album: Hell Creek Formation Microsite

    A fragment of a frog jaw, with telltale bumps on the labial surface.
  4. JacksonR

    Carboniferous Microfossils

    I've been looking and pulverized rock under a microscope and have found some interesting items. The first image is possibly a fish jaw, followed by a possible shark spine fragment. Any ideas on those 100% or the rest? Thanks.
  5. 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.
  6. 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.
  7. ThePhysicist

    Myledaphus teeth

    From the album: Hell Creek Formation Microsite

    Myledaphus (a guitarfish/ray) teeth are quite common, as expected for a riverine deposit.
  8. 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.
  9. 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
  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. Top Trilo

    Microfossil or Microfoam?

    In the annual TFF secret Santa I received a lot of cool fossils. One was a Mississippian aged bryozoan hash plate from the chesterian zone of the Bangor limestone. There are lots of interesting tiny details on the specimens so when looking through a microscope I spotted a tiny white sphere, only 150 micrometers in diameter. The question is, is it a fossil associated with the other bryozoans or is it just some synthetic foam or similar? The reason I ask is because it appears to be clean of matrix resting on top rather than imbedded. Stupid question? Maybe.
  12. ThePhysicist

    Coelophysoid? Theropod

    From the album: Triassic

    From the "dawn" of the Dinosaurs, this small tooth represents an early theropod. Unlike the other serrated archosauriform teeth present in the formation, this tooth is ziphodont - thin and labio-lingually compressed - the archetypical tooth form that most theropods adhered to since their beginnings.
  13. ThePhysicist

    Gypsonictops (Eutherian) premolar

    From the album: Hell Creek / Lance Formations

    This is a very close cousin of ours - a eutherian (placental) mammal from the time of T. rex. This particular mammal has an interesting phylogeny, being positioned basally to insectivores, rodents, and primates. (See Lillegraven 1969)
  14. ninjameB

    Tooth ID, Gainesville, FL Miocene

    Found this weird guy in the creek today... very small. Any help would be appreciated. IMG_0119.MOV
  15. ThePhysicist

    Thescelosaurus teeth

    From the album: Hell Creek / Lance Formations

    A handful of teeth from a small ornithischian dinosaur. All recovered from a channel deposit in Montana; they show varying degrees of feeding wear and enamel loss from river tumbling. The two on the left are anterior positions, the rest are lateral/cheek teeth.
  16. BlueFossils

    Is this an astragalus to an rodent?

    Is this an astragalus to perhaps an insectivore, squirrel, or other type of rodent? Found in the Nebraska badlands – private ranch – early Oligocene, Brule Formation, Orella Member, about 20 feet above the Upper Purplish White (UPW) ash layer – a Harvester ant mound specimen. The bone (3 to 4 mm in length) has a rounded end which I never seen before on any astragulus. Two specimens photo’ed in this post. Any help in ID’ing this fossil would be greatly appreciated, Thank you.
  17. ThePhysicist

    Pectinodon tooth

    Identification Troodontid teeth may be identified by their exaggerated, triangular, apically directed posterior denticles1. Pectinodon bakkeri is the only Troodontid species currently named from Lancian strata; its teeth are on average smaller and more gracile than those of its cousin, Troodon. Comments This is a large anterior dentary tooth, recovered by screening matrix from a channel deposit in central Montana. Pectinodon (meaning "comb-tooth")1 is a tooth taxon, since no remains attributable to the genus beyond teeth have been found. Pectinodon seems to be a rare member of the Hell Creek fauna, with their teeth being fairly uncommon. It was a small theropod, with teeth that couldn't handle stresses as well as their Dromaeosaurid and Tyrannosaurid relatives2. This coupled with their small size suggest that Pectinodon was a small/soft prey specialist, preferring the rodent-sized mammals of the time, lizards, insects, etc. Some researchers have proposed omnivory as a possibility for Troodontids (cf. Holtz et al. (1998))3. References 1. Carpenter, Kenneth. "Baby dinosaurs from the Late Cretaceous Lance and Hell Creek formations and a description of en new species of theropod." Contributions to Geology 20.2 (1982): 123-134. 2. Torices A, Wilkinson R, Arbour VM, Ruiz-Omeñaca JI, Currie PJ. "Puncture-and-Pull Biomechanics in the Teeth of Predatory Coelurosaurian Dinosaurs." Curr Biol. 2018 May 7;28(9):1467-1474.e2. 3. Holtz TR Jr, Brinkman DL, Chandler CL. "Denticle morphometrics and a possible omnivorous feeding habit for the theropod dinosaur Troodon." Gaia. 1998; 15: 159–166.
  18. Yoda

    Conodont elements

    I was looking at some of my micro fossils with my microscope today I have a small collection of Conodont elements Palmatolepis glabra Chappel Limestone, Lower Mississippian, Blanco Co, Texas
  19. OregonFossil

    Possible specimen?

    With the only diatom green formation about 4 hours away, I decided to see what I can find the somewhat lose matrix sandstone of the Pittsberg Bluff Formation. The attached image was taken at 100X and captured in a 5 mpx camera. Processed in PS. I've drawn a pentagram around the object of interest at bottom center of image (also the oblect to the right of it looks interesting - maybe?). Is this just a waste of time, or can one find micro fossils in sandstones? thanks.
  20. ThePhysicist

    Frog jaw

    From the album: Hell Creek / Lance Formations

    An overlooked member of this ecosystem - the humble frog. The night soundscape may have been dominated by them and insects, as in many forested/swampy ecosystems today.
  21. CM8

    Interesting Hell Creek jaw

    Hi all, This jaw was just listed on a particular auction site and caught my eye. Locality according to the seller is Hell Creek formation, Montana. The fossil is 15mm long. Their ID is just "dinosaur" of unknown species. To my amateur eyes, the size and "shelf" on the inside of the bone makes me think lizard, but the teeth really look like those of dromaeosaurs. Any thoughts on ID? Lizard, juvenile dromaeosaur, or bird even?
  22. ThePhysicist

    Pectinodon bakkeri

    From the album: Hell Creek / Lance Formations

    This rare theropod tooth was found via screen washing matrix from a channel deposit. It's large for the species and from the front of the jaw. All of the denticles are intact - a spectacular specimen. Pectinodon (meaning "comb-tooth") is a tooth taxon, since no remains attributable to the genus beyond teeth have been found. Pectinodon seems to be a rare member of the Hell Creek fauna, with their teeth being fairly uncommon (though being so small, I'd guess that few people actively search for them). It was a small Troodontid theropod, with teeth that couldn't handle stresses as well as their Dromaeosaurid and Tyrannosaurid cousins (Torices et al. (2018)). This coupled with their small size suggest that Pectinodon was a small/soft prey specialist, preferring the rodent-sized mammals of the time, lizards, insects, etc. Some researchers have proposed omnivory as a possibility for Troodontids (cf. Holtz et al. (1998)). Troodontids famously are regarded as among the most intelligent dinosaurs for their large brain size / body size ratio. This notion serves as fodder for speculation that had the dinosaurs not gone extinct, Troodontids (Pectinodon being (one of?) the last) would have continued to grow in intelligence and develop sentience and civilizations. Troodontid teeth like Pectinodon can be easily identified by their small size, exaggerated, triangular, apically oriented posterior serrations.
  23. PetrifiedDoubleGulp

    Microscopic image from Calvert Formation sediments

    Trying to get input on this form I found in sediments from the Calvert Formation. This test batch is from a mudstone, broken up and reduced through no. 20 and no.120 testing sieves. The close up is using a 40/0.65 lens
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