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Found 21 results

  1. Hello everyone, I was recently looking at one of our local beaches. I didn’t have a lot of time so went where most people go. Sometimes even though it is picked over you might still find something special. I often think, there could be just a few mm of sand covering up something special! I saw this sitting there waiting for me and thought. That’s cool. Level of excitement maybe a 6 out of 10? I hadn’t seen associated verts like this at this site and was thinking “shark or fish” (p.s. photos are at home after finding it in better light. But pretty much what saw on the beach) I was leaning towards shark and then flipped it over. Excitement went to 9/10!! I couldn’t believe what I was seeing. This looked like preserved shark “skin” or at least in situ dermal denticles. A first for me at this site. If you’d like to join me down a wormhole on learning about shark dermal denticles. Read on! This is a normal journey I take as I learn as much as I can about each fossil. Every fossil has something to teach. About the environment the animal lived in or the creature itself. I’ve learnt a lot about biology/ecology this way. if you zoom in under the scope, there are 2 layers of denticles. The top one most visible in the above photo seems to be looking at the base of the denticles from underneath, like a skin has folded on itself these look like the “roots” of the denticles. In the photo below. Each one about 1-2mm across In the photo below is the underside of the top of some denticles A tricuspid type. A few mm across. So zoomed in more than the above photos. these look like the “drag reduction” type tricuspid denticles top left in the figure below. This figure shows that sharks will have different types of denticles on different parts of the body. The proportions and types differ depending on ecology. Pelagic (requiring drag reduction) vs bottom feeding (demersal) requiring protection from abrasion. I searched around the specimen and found a few examples looking at the top of the denticles. Below. Unedited Photo above with red sketch to highlight features below. denticle is a couple of mm across. You can see the crests typical of the drag reduction type. below: looking side on at an individual denticle. The “root” at the bottom and tricuspid denticle on top. so how to move forward? The matrix isn’t acid soluble. But I’d like to be able to clearly see some complete denticles. Gentle air abrasion? I’m not sure if an ID to family will be possible. I have shown a shark tooth/denticle expert (from Japan) and he thought we could narrow it down to Triakidae (hound sharks) or Pentanchidae (deep water cat sharks). The age range is Miocene- Pliocene for the coast in this area. I think Late Pliocene for this based on lithology. So now…..where is the rest of the shark? Thanks for following along!
  2. Sonickmonx

    Stingray Denticle

    From the album: Sonickmonx's South Carolina Finds

    This is the only large stingray denticle I've found and it's a beauty!
  3. Searcher78

    Paleocene Potomac River

    Going through sifted sand from Douglas Point, Maryland. I average about 3 teeth/fossils per hand full of sand. Here are a few from searching.
  4. I'm happy to announce i possibly found the most complete Listracanthus to date. And we may finally get a proper ID for this strange creature. I thought this was regurgitation, but while prepping i believe i ran into cartilage. So i will stop prepping and give this to a professional, or at least let someone with more experience look at this. Unfortunately the rest is in a giant wall of black shale that i won't be able to get back to until next Spring/Summer. The denticles are up to 6mm thick and associated with smaller denticles. I will get more pictures under a scope when i get a chance. God willing i will recover the rest of this creature in 2019. Happy hunting! Possible cartilage
  5. Shellseeker

    Ray denticles

    My wife is active on facebook. I'm not. A while back I asked her to get someone fossils related off facebook for me. I guess she is watching and texted this.... Pretty neat picture. I had thought that the barbs were closer to the end of the tail.... Enjoy
  6. ThePhysicist

    Ray denticle

    From the album: Aguja Formation

  7. I recall not too long ago there was a pretty interesting scientific article published in the Journal Science describing how scientists analyzed the amount and diversity of chondrichthyan denticles in ichthyoliths from the North and South Pacific dating from around 20-19 million years ago and discovered a sharp drop in the number and diversity of denticles around 19 million years ago, indicating a massive extinction took place which took sharks 2 to 5 million years to somewhat recover from (it's still unknown if this impacted chondrichthyans worldwide or just in the pacific). Here's the paper: https://www.science.org/doi/10.1126/science.aaz3549 E. C. Sibert, L. D. Rubin, An early Miocene extinction in pelagic sharks. Science 372, 1105–1107 (2021). But after reading it, I remembered how the Mississippian and somewhat Pennsylvanian periods of the Carboniferous era have been called the golden age of sharks due to the sheer diversity of chondrichthyan genera alive at that time. http://www.elasmo-research.org/education/evolution/golden_age.htm What I'm wondering is does this paper, in revealing this early miocene extinction event, inadvertently also reveal that the period immediately prior to the event was a second "golden age" for the chondrichthyans?
  8. I found these back in January but apparently never posted them here (can't find any thread), I'm post mostly to my FB nowadays. I found these in about 30 minutes. They are typically assigned as "Petrodus" but who really knows. Years ago at this site I found teeth from at least 3 shark species including "Edestus". These are from the "Mingus Formation" I believe.
  9. ThePhysicist

    Shark? dermal denticle

    From the album: Post Oak Creek

    To find denticles, you need to go to the finest grain size. This beautiful one could be shark, but I'm not certain.
  10. Shellseeker

    Flat Dermal Denticle

    This is a 1st for me, a denticle that is this thin, this large. I dimly recall hearing somewhere that these came from sharks, not stingrays. Let's see if some more knowledgeable than I concur. @Al Dente @MarcoSr@siteseer
  11. RuMert

    Tooth or denticle?

    From the album: Moscow region Late Jurassic vertebrates

    2 mm, Moscow, Fili Park, Volgian - Kachpurites fulgens zone
  12. PaleoNoel

    Dermal Denticle? Lance fm. Wyoming

    Hi everyone. I found this little fossil recently while working through a sandy conglomerate matrix I brought back from this summer's hunt in Wyoming's Lance fm. I believe it's a dermal denticle from some variety of cartilaginous fish, my first guess would be the Hybodont shark Lonchidion, but the guitarfish Myledaphus is also incredibly common in these sediments, however I haven't seen any pictures of denticles belonging to the latter or close relatives. It's about 2 mm long and about 1.5 mm tall. I would love to hear some input. Thanks, Noel
  13. Hi all! Well, now I am into splitting shale finding conodonts and will post my best ones soon, but I've come across several of these which are comparable to images in the forum and on references to Listracanthus denticles?. It was found in Pennsylvanian Stark shale member in Kansas City two days ago. Is that a fair i.d.? They're are all very similar, but I've found this as well- a "carbonized" film with a structure that doesn't have straight lines, but somewhat veinated? Very difficult to get pics of that so provided several in different light. The first is 27mm long and the black piece is only about 2-3mm at most. Am I on the right track on the first, and any ideas on the second? same, fish fin, plant impression/other? thanks! Bone Then here's the other one- found in a different slab of shale but same level- the bottom "ridge" appears to diverge in the first couple pictures, then there appears to be divergence in the middle in the darker pics. Any thoughts welcomed! Bone
  14. I was going over some of bits of Permian micro mix from the Neva Formation in Kansas and I found a fossil I had come across in my initial search months ago. I recently looked at a publication on Permian sharks from Russia. I remembered seeing something similar in that publication. It was a monocuspid denticle attributed to Cobelodus and I can not help but wonder if our mystery fossil is chondrichthyes denticle of some sort. Any thoughts ?
  15. Shellseeker

    Dermal

    When hunting the Peace River, I find some - many Ray dermals of this general form (not quite as pristine as these phosphate mine versions: I have been finding more of the little "buttons" recently, maybe 5-10 a hunting day. When in the productive areas, I find lots of these which I always thought of base plates for attaching bottom of Ray spines. The I ran into something that I have definitely NOT seen previously. Less than the size of a penny. So, what is this and , am I moving back or forward in time comparing this new arrival with older stuff? Usual suspects: @Harry Pristis, @siteseer, @MarcoSr @sixgill pete@Al Dente @cowsharks
  16. Matt Stratton

    Dermal denticles

    Originally from the Midwest, I've been hunting for fossils for about 50 years and found about two "fossilized sea shells". And this was not from a lack of trying! I moved to Summerville, SC about three years ago for a job that included lots of travel. Now that travel is finished and meeting new friends in the area, I have connected with some kids that stumbled onto something that I think is big! Had I grown up in Summerville, I probably would have change my career to paleontology instead of Electrical Engineering. I am amazed at the finds here in my home town. I have taken my wife and kids including their friends to a spot that allows them to find Shark teeth (at a minimum) within 2 minutes of arriving to an area. My dilemma, I would like to know what these type of "dermal denticles" are. For every 20 shark teeth I find, I find one of these. Please refer to the attached pics. Thanks Matt
  17. Northern Sharks

    Listracanthus pectenatus.jpg

    From the album: Unusual Shark Teeth

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