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Found 15 results

  1. I found this walking by my home in Vermilion County, Illinois along a creek bed with other rocks. This stood out to me and the little details on it look very odd. I have tried to theorize what it is but can’t. But they look like little bones possibly? Suggestions?
  2. Hello, I will tag you directly @pachy-pleuro-whatnot-odon @Praefectus. From this jaw which measurement should one take to estimate the full size of the specimen being this a thalassotitan atrox? I know head to body ratio of thalassotitan ies 1:8 more or less, what I am not sure is here which would be the correct measurement for the head size. From point A to B measures 135cm. Would this be the right measurement? Then full size 135*8/100= 10,8m more or less?
  3. Hello everybody So this is a question not directly regarding fossils, but I feel this is nevertheless the right place. Is there any information on how big the teeth of modern great white sharks can get? For Megalodon there is a great amount of information regarding the size of the teeth. But for modern great whites I only find information about the size of the whole shark. I would like to make a small display with my 5.64 inch Meg tooth and a modern great white. I was able to get a 2.4 in modern white shark tooth. But I dont know if this is big or average. Thanks for your help
  4. sharkcollector

    Otodus body size to vertebrae

    Recently, after going to my favorite fossil store, I aquired a Otodus Obliquus vertebrae. It came from a formation in Morocco, and is approximately 54 million years old, from the pliocene. Otodus is an extinct mackerel shark, related to the far larger O. Megalodon. The fossil is approximately 10.5 centimeters or 4.13 inches. I was wondering how large the shark would be relative to this vertebrae (assuming this was the largest vertebrae from the shark.)
  5. I am quite interested about large teeth. Below is the largest mosasaur teeth i have ever seen, with the incomplete crown height greater than 7 cm, the complete crown height may be over 8 cm. But i've heard somebody said that the tooth crown of largest mosasuar can reach 10 cm, is it true? Or can mosasaur tooth really grow that big? I'll appreciate a lot if you share your idea or pictures! What's more, when we compare teeth from different individual but from same section of the jaw bone, do larger teeth represent larger individual in mosasaurs?
  6. For more than 10 years that I have been going through this forum, I always see so many photos of identification requests with a coin, a x-dollar bill or any useless object to measure the size of the fossils. Quite often, other members and I ask to have a real ruler in cm or inches on the photos, or to have the size of fossils in the text, some say that they do not have a ruler... How can we not have a rule at home when we tinker, when we have a schoolboy at home, when we knit or sew? Moreover, it is not expensive and there are rules in every department store. We can also find rules drawings on the internet and print when we have nothing else. So in the face of this recurrence that poses many problems for those who are willing to do a service to identify your fossils, I made a millimetre paper on my computer this morning. It just took me 1/4 hour. All you have to do is print it on a thick sheet of paper and place your fossils on it before photographing them. Now no one can say that he has nothing to measure his fossils. Your turn ! Coco Papier millimétré.pdf
  7. Miocene_Mason

    New C./O. megalodon Size estimation

    As spring dawns on Maryland’s fossiliferous coast, so does yet another size estimation for our well-loved extinct shark Carcharocles/Otodus megalodon! The lead author is CMM assistant curator Victor Perez, awesome dude. This one spits out around 20 meters or 65 ish feet. Also includes estimations on Carcharodon hastalis and Carcharodon hubbelli amongst others. This method is unique in that it takes into account dentition size instead of just tooth size. Take a look! You are likely to be seeing it in the news for the next couple of weeks. https://palaeo-electronica.org/content/2021/3284-estimating-lamniform-body-size?fbclid=IwAR3a4cKemdKsVRqBp9qeOou2Hih2ZWcR2WOl8_tbmG8tiT0ZhDqDG4RsF2I
  8. I was trying to find the longest straight shelled cephalopod length but was unsuccessful, I heard anywhere from 7-14 feet. What's the real answer? Thanks.
  9. General question for the group: Would you rather find a large (large being over 8 inches, in my case), inflated trilobite with some damage OR a smaller, flat trilobite with very little damage at all? I know it would depend on the actual examples, but in general I was wondering what people preferred. I have a small one that I think is cool but the larger ones are just so much more impressive to me... I am just starting to collect trilobites, as I have only recently realized they can be found in my area. Thanks.
  10. butchndad

    What is a micro?

    Good morning. Is there an accepted demarcation of what constitutes a micro? Is it 1/4 inch or smaller? These two Crows are 5/16 inches. The other photo is, I think, just a cusp which is 1/8 inch. Thanks all.
  11. I have a question, for which there is no right or wrong answer. And I do realise that it's very personal. But when faced with choosing to buy a fossil out of a batch, and there is a fair amount of variation, how do you choose which one to go for? A smaller specimen with more detail? Or larger with less detail? I would be interested to hear opinions.
  12. Righteous

    Teeth Size

    Ok here’s a question that’s been bugging me. If dinosaurs were so big why are all the teeth you see for sale so little with most being under 1”? You see T Rex teeth and there all under a inch. i would think they have teeth like a banana.
  13. Utera

    What are these?

    Hey guys, I recently got a bunch of fossils for my friend as an early Christmas present and I'm trying to figure out what they are. Most of them are brachiopods and clams but I'm having trouble identifying the genus of these guys. I have no information on where they came from or what period they're from. Can you guys help me as best as you can? IMG_3331.HEIC IMG_3332.HEIC
  14. Mike from North Queensland

    Ichthyosaur size calculation

    In my last couple of collecting trips I have found some larger than normal vertebra from the Australian ichthyosaur platyptergius australis. What I am after is some literature that may enable me to calculate the length of an ichthyosaur based on the vertebra size. I realise that the approximate body position the vertebrae will need to be a major part of the calculation. Previously the larger vertebrae I found were around 80 mm diameter x 25 mm thick and quite often vertebrae from infants were also found with these so I had assumed fully grown. The last couple of vertebra have measured 120 mm diameter x 40 mm. This disparagement in size could be due to the younger / smaller females being more prone to dying during birth, they kept growing throughout there life or perhaps the alpha males were larger. Thanks in advance for all input Mike
  15. What were the largest animals to survive the KT extinction?
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