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Found 22 results

  1. ThePhysicist

    Orthacanthus teeth

    From the album: Permian

    Some more complete Orthacanthus teeth, each maybe about 1/4" in size
  2. ThePhysicist

    Handful of broken Orthacanthus

    From the album: Permian

    One of the most common fossils from the Permian (this locality in particular). Unfortunately, they are almost always broken. Of the hundreds of teeth I have, perhaps only a few larger than a couple of mm are mostly complete.
  3. ThePhysicist

    Orthacanthus serrations

    From the album: Permian

    Orthacanthus (a Xenacathid Chondrichthyan) have squared-off, irregular serrations - distinct from those on say, Dimetrodon.
  4. ThePhysicist

    Orthacanthus bite marks

    From the album: Permian

    I commonly see bite marks on many of these fossils. Some like those on this Orthacanthus cusp were likely made by serrations raking across the surface.
  5. I was lucky enough last week to be able to make my second donation to the collections of the Field Museum of Natural History in Chicago. This donation consisted of two Mazon Creek finds from the river itself, both collected on the I&M Canal outing last year. The first is an extremely rare tetrapod larva. The second fossil is an exceedingly well-preserved Orthacanthus tooth, featuring serrations in the cusp, a very rare trait for Mazon Creek teeth of this sort. It may prove to be complete as well. I was able to visit the museum to make the donation this time and it was an honor to go behind the scenes and talk to professional paleontologists about these specimens and Mazon Creek collecting. Thanks again to @jdp for helping make this possible!
  6. ThePhysicist

    Orthacanthus tooth

    From the album: Permian

  7. ThePhysicist

    Developing Orthacanth shark tooth?

    From the album: Permian

    This may be a pathology, or a tooth in development?
  8. ThePhysicist

    Orthacanth shark teeth

    From the album: Permian

    "Eel" shark teeth.
  9. ThePhysicist

    Orthacanthus platypterygius

    From the album: Permian

    Freshwater "eel" shark teeth.
  10. Hi everyone I think I just found a new hobby With my latest fossil delivery I recieved quite a lot of microfossils & matrix vials as the world of microfossils was something that I have been long interested in. So a 2 weeks ago I finally ordered my first microfossils for which I reserved a special drawer in my archive cabinet. So here is a recapp of what I all got: 3 vials of permian material from Waurika, Oklahoma 1 vial of permian material from The red beds of Archer County, Texas 1 small vial of Conodont rich Mississippian material from the Chappel Limestone formation, Texas 1 small vial of Cretaceous Lower Gault Clay, East Wear bay, Folkestone, Kent, UK A micropalaeontology slide with Jurassic Blue Lias matrix rich in holothurian material. A thin section of an Ostracods filled Elimia snail from the Green River Formation in Wyoming A thin section from the Rhynie chert of Scotland which should contain preserved parts of the plant Aglaophyton major and perhaps even other species. I also got a lot of Bull Canyon micro fossil teeth and 2 cretaceous mammal teeth from Hell Creek In this topic you will be able to follow my path through this newly discovered hobby as I will post my finds and progress Currently I am only working with a clip-on cellphone microscope, but I do plan on getting a professional microscope in the next few months! (Tips are always welcome) So let's put on our Ant-Man suit and explore the microfossil realm So here are some of the first pictures I made of some of the microfossils Starting with the thin slices! Thin slice with Ostracon filled Elimia tenara snail from the Green River Formation, Wyoming Thin slice with Aglaophyton major from Rhynie Chert in Scotland
  11. Hi all, Recently I was collecting at a locality that exposes the Duquesne Limestone and shale, which if you’ve seen any of my previous posts you’ll know that I’ve collected extensively. But for those of you that have not, the Duquesne shale is a layer of black, carbonaceous shale found in areas where the Conemaugh group is exposed. This layer is chalk full of disarticulated vertebrate remains, but some of the most recognizable are the teeth of Orthacanthus and Xenacanthus. These were eel-like sharks that existed from the Devonian-Triassic and had bicuspid or tricuspid teeth. They grew to be about 10-12 feet at the largest and thrived in the swampy lakes of the late Pennsylvanian. It’s somewhat uncommon for me to find a large Orthacanthus tooth (which are tiny compared to Otodus sp. )and it is even rarer for me to find a tooth with feeding damage. It seems to me that, understandably, many collectors of Cenozoic shark teeth are disappointed when they find shark teeth with feeding damage, but for me at least when I find Paleozoic shark teeth with feeding damage it makes it even more special. Last time I was collecting I did just that. Interestingly enough this Orthacanthus compressus tooth is my largest yet and has a very unusual break. The cusp that is missing is not broken cleanly at the enamel, rather, when it broke off it took a good chunk of the rooth with it. To me at least this would indicate that the shark was using quite a bit of force when it bit down, and whatever it bit in to must have been very hard and made for a painful meal for the shark. It’s important to note that the other cusp was damaged recently and isn’t feeding damage. I’m not one to heavily speculate but I’d imagine that it had to have bit in to one of the heavily armored Paleoniscoids for damage of this nature to take place. Or, who knows, the tooth might have just been old. Whatever happened to break the cusp is lost to time, I guess. Regardless, I think it’s a wonderful find and reminds me that these animals were truly alive and had imperfections. Hopefully you all find this as interesting as I do .
  12. Hello everyone, Curious if anyone knows the difference between Xenacanthus and Orthacanthus shark teeth? Particularly as it concerns shark teeth from the Permian site in Waurika, Oklahoma? Have quite a few shark teeth from there and am unsure how to determine which is which. There's also Barbclabornia, to complicate matters! Any help would be appreciated (and yes, I have seen the rhynie chert website on them, but it doesn't show/tell the difference between the three kinds)
  13. Strepsodus

    Xenacanthiformes collection

    Here are my best fossils of Xenacanthiformes. All are from the British Coal Measures (Upper Carboniferous). The first one I suspect may be Orthacanthus due to the width of the cusps, though Xenacanthus teeth sometimes have quite wide cusps. I think all of the other teeth are Xenacanthus. The second one seems very large for Xenacanthus (I suspect around 14-15mm though it’s difficult to tell how far under the rock the cusps go) but I’m fairly sure it’s Xenacanthus rather than Orthacanthus. The third photo is what I believe to be a Xenacanthus denticle.
  14. fossilsonwheels

    Our new Shark Education Displays

    Pictures first, full descriptions will follow Paleozoic Sharks and “Sharks”
  15. Hi all, I have seen and heard from multiple different sources that the cephalic spines of Xenacanthid sharks are considered to have been venomous. This is usually supported by the serrated nature of these spines and a canal that runs down the middle of them. Has any research been done to prove or disprove this hypothesis. I know that we can never know for sure but I am curious if there is any scientific support to these claims. Thanks in advance, Zach
  16. Hey guys. I'm looking for some help with this large mystery fish tooth from the late Carboniferous of Illinois. The closest match i can find is from the Devonian lobed finned fish Hyneria. But this is late Carboniferous almost Permian. Another contender just based on size is the Rhizodont. But it's not rounded. This tooth flattens out to two cutting edges that are very sharp. It honestly reminds me of a Barracuda tooth. This broken tooth measures about 20mm, but would have most likey been around 30mm if complete. It is associated with a Megalichthys scale and Orthanthus teeth. Any thoughts?
  17. This head spine has just reappeared in my collection - I must have found it about 20 years ago in Linton. Is that an Orthacanthus or Xenacanthus head spine? The length is about 8 cm / 3". Thanks Thomas
  18. fossilized6s

    Megalichthys of Illinois

    Yesterday i found a very rare Megalichthys jaw with dozens of teeth still attached in the Carboniferous of Illinois, USA. This is possibly the best known example of this fish found in Illinois. Not sure yet though. I still need to do more research. You can see four larger teeth in cross-section on the matrix waiting to be prepped out. Then there are smaller teeth in-between the larger ones, maybe 4× smaller. I also found several large scales. I'll attach the best one. All of this material still needs a proper repair and prep job. The preservation on this material is just stunning. I'm not sure it could get much better. These bone fragments and scales are often found with Orthacanthus teeth and Calamites. So it gives us such a beautiful snapshot of the environment at the time. Just awesome! Happy hunting
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