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Found 47 results

  1. Bone found in Washington State creek

    I found this bone in a ditch with no teeth marks or chewing on it. Obviously I believe this is modern as it still smelled of death and decay (I ran it under soap and boiling water and then rubbed it with sanitizer. and even then I don't touch it without a napkin) I was curious if my hypothesis was correct about this being a deer femur bone? I wasn't sure because I'm no bone expert but maybe someone here knows, all I know is we have deer, bears, cougars and possibly elk or moose but that would be rare. This was found in a creek by Murdock beach Washington State on the Olympic Peninsula (temperate rain forest conditions near large ocean.)
  2. Tooth

    I found this tooth is Somerset, it is probably modern, does anyone know what it is?
  3. I found this bone on a Tampa Bay Beach, Florida and the next week I found an identical one but left it. When I first scooped it out of the water I thought it was a molar from a manatee. After looking at it I saw it didn't have a root and was it a joint bone? From the weight and color I think it's modern but curious to find out what I found and what animal. (ruler is in inches) Any help or ideas welcome and appreciated.
  4. No idea about what this is.

    Recently re discovered a bunch of these things that we got from the Canary Islands. They were all washed up on the beaches and they do not look stricktly geological to me and looks kind of like some kind of modern calcified organism or trace of one. I stumbled upon a book at some point, I believe it was called Darwin's Fossils that said these were some kind of remains of algae that have fossilized, but when I looked that up there was no evidence I could find supporting this claim, maybe someone else knows what these things could be? Any new insight is appreciated, Thank you.
  5. Bone

    Just curious what this bone might be. It's not a fossil but wondering what the bone experts think... deer or something else?
  6. I picked up this Wild boar (Sus scrofa) jaw section from Florida recently. While it not recognized in the Florida fossil record due to the boar being an introduced species in the past 600 years or so years. This piece has heavy patina, and is mineralized but is too young to be a fossil as it is thought to be a peice that is 400-500 years old. I have Mastodon and cave bear material that are older and far less mineralized. Other than using the rough date of 11k years ago, how else do I explain why a younger less mineralized peice is not a fossil while an older less mineralized peice is a fossil? Thoughts?
  7. Coral, fossil or modern

    I have a friend that brought this chunk of coral from the Dominican republic and said that it washed out of a cliff face and he picked it up afterwards. I really do not see any signs of it being a fossil and believe that it is probably modern. What do you think? Thank you in advance.
  8. Hi guys! I just uploaded a gallery of modern Carcharhinus upper dentitions: . The images are from my master's thesis (Smith 2015), the full text is available at (https://www.researchgate.net/publication/316735477_Species_discrimination_in_Carcharhinus_shark_teeth_using_elliptic_Fourier_analysis). Unfortunately, due to file size limitations, the images in the paper are not really good enough for detailed analysis of the morphology. So I have uploaded them individually here. I personally extracted the teeth from almost all of these jaws...If I remember correctly, they were soaked in isopropyl alcohol for several days and then the teeth removed with toothpicks and/or just pulling them out with my fingers. I cut up my fingers too many times to count trying to get these suckers out! Only the upper dentition is included; the bottom teeth in Carcharhinus are very same-y so we just focused on the uppers. Keep in mind, these represent only twelve species out of over thirty described species. They are biased towards species today present in the Western Atlantic/Gulf of Mexico. Five species now present in the Western Atlantic/Gulf of Mexico were not included due to lack of specimens/time: C. altimus, C. galapagensis, C. perezi, C. porosus, and C. signatus. Other Carcharhinus dentitions are available on the net. J-elasmo has some, I believe mostly collected from near Japan: http://naka.na.coocan.jp/JAWCarcharhinidae.html. They generally match well with my dentitions, although their Silky (C. falciformis) dentition is more coarsely serrated at the tips than mine, and the lateral notch, which is prominent in my specimens, is basically absent in the J-elasmo dentition. And of course there is Elasmo.com, a great resource for all sharks, not just Carcharhinus. Their C. falciformis dentition is similar to mine, so I don't know what's going on with J-elasmo's dentition, either it's mislabeled or Silky teeth look a lot different in the western Pacific. Or it's just an unusual specimen. And of course there are a bunch of papers online with Carcharhinus teeth, although these are generally isolated fossil teeth. The single best resource I could find for Carcharhinus identication based on teeth is unfortunately difficult to obtain, and would probably require an interlibrary loan request: Garrick, J. A. F. (1982). Sharks of the genus Carcharhinus. US Dep. Commer. NOAA Tech. Rep. NMFS Circular, 445, 194. His shark teeth images are illustrations, but well done, and with a lot of descriptive information. Purdy et al. (2001) is also a good reference:(https://www.researchgate.net/publication/284595551_The_Neogene_sharks_rays_and_bony_fishes_from_Lee_Creek_Mine_Aurora_North_Carolina). You can find references to several papers related to fossil Carcharhinus, as well as a general overview of their fossil record, in my thesis. Finally, I'm attaching a figure from my thesis, illustrating the morphological terminology used: C. falciformis, upper right jaw, 5th position from symphysis. Feel free to add additional references or information about the genus Carcharhinus. Or if anything is incorrect in this post. The subject of fossil Carcharhinus tooth identification comes up fairly regularly in the forums, so let's try and stick as much information in here as possible!
  9. Carcharhinus leucas

    From the album Carcharhinus dentitions

    C. leucas. Bull shark. Scale bar= 5mm.
  10. Carcharhinus falciformis.jpg

    From the album Carcharhinus dentitions

    C. falciformis. Silky Shark. Scale bar=5 mm.
  11. Carcharhinus brevipinna.jpg

    From the album Carcharhinus dentitions

    C. brevipinna. Spinner Shark. Scale bar=5 mm.
  12. Carcharhinus brachyurus.jpg

    From the album Carcharhinus dentitions

    C. brachyurus. Copper shark. Scale bar=5 mm.
  13. Carcharhinus amboinensis.jpg

    From the album Carcharhinus dentitions

    C. amboinensis. Java Shark. Scale bar=5 mm.
  14. Carcharhinus albimarginatus

    From the album Carcharhinus dentitions

    C. albimarginatus. Silvertip Shark. Scale bar= 5 mm.
  15. Carcharhinus acronotus

    From the album Carcharhinus dentitions

    C. acronotus. Blacknose shark. Scale bar=5 mm.
  16. Carcharhinus sorrah

    From the album Carcharhinus dentitions

    C. sorrah. Spot-tail shark. Scale bar=5 mm.
  17. Carcharhinus plumbeus

    From the album Carcharhinus dentitions

    Carcharhinus plumbeus. Sandbar shark. Scale bar=5 mm.
  18. Carcharhinus obscurus.jpg

    From the album Carcharhinus dentitions

    Carcharhinus obscurus. Dusky shark. Scale bar=5 mm.
  19. Carcharhinus longimanus

    From the album Carcharhinus dentitions

    Carcharhinus longimanus. Oceanic Whitetip Shark. Scale bar= 5 mm.
  20. Carcharhinus limbatus

    From the album Carcharhinus dentitions

    Modern C. limbatus blacktip shark. Scale bar=5 mm.
  21. Neoichnology pop quiz

    What life form caused the pattern of deformation seen in this gastropod. Five points each for Kingdom, Class, and Family. hint: It was found on the shore of a lake in Maine.
  22. Fossil or modern?

    Are these fossils or modern? Found in Idaho.
  23. Tadpole trace ?

    These are not fossils, but the concept could be useful in understanding ichno fossils. At first I came to the pool without tadpoles, it was late in the afternoon on a warm day and I moved slowly as I contemplated how the craters were formed. Had birds been probing the mud ? There did not seem to be a direct correspondence between the tracks and the pits though. The next pool I came to was deeper and perhaps allowed tadpoles a better escape from predators. The pictures were taken the next morning and the tadpoles were more disturbed by my approach so it doesn't show the behavior, but they seemed to be covering themselves with silt in the pits. Applying sun screen perhaps ? Or is the correlation coincidental ?
  24. New Jersey Modern Sharks

    Hey everyone, I recently walked on a beach near Keansburg, New Jersey, and came across an unusually large amount of dead animals. There were mostly crabs (blue crabs and spider crabs), baby shells, and jellyfish lying on the beach. However, I came across three small sharks. Does anyone know what factors might be responsible for the dead animals, such as rising water temperatures? If anyone knows what type of shark (I believe it is the smooth dogfish, Mustelus canis) and jellyfish that is, please comment. Thanks everyone, Joseph Jellyfish: Shark #1 body (with a fish behind it) Shark #1 dentition: Shark #2 remains: Shark #2 dentition:
  25. Back in the 1970's I was given these 4 teeth and was told they were fossil shark teeth. How can you tell if they're fossil or modern?????
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