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  1. 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.
  2. 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?
  3. 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
  4. osertichvarriccs41598-021-89472-1.pdf Tiny ornamented eggs and eggshell from the cretaceous of Utah represent a new ootaxon with theropod affinities Sara Oser,Karen Chin,,Joseph J.W.Sertich ,DavidJ. Varricchio,Seung Choi,Jeffrey Rikin Nature(2021)11:10021 recommended!
  5. 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-es
  6. 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.
  7. 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.
  8. Is it easy to find the size of the animal with a tooth? For example, i have a spinosaurid tooth from morroco 2.75 inch long (approx. 2 cm is root), a large mosasaur tooth about 2 inch, a Carcharodontosaurus 1.94 inch. My estimation: my spino tooth belong to an animal about 7-10 meters long if it is a of the large teeth on this spino mouth, for the carcha i think that came from the middle or the back of the jaw of an animal 5-8 meters long, and the mosasaur from a 7-8 meters long mosasaur, and is a very thick tooth.
  9. 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.
  10. JOP New small-bodied ornithopods (Dinosauria, Neornithischia) from the Early Cretaceous Wonthaggi Formation (Strzelecki Group) of the Australian-Antarctic rift system, with revision of Qantassaurus intrepidus Rich and Vickers-Rich, 1999 Matthew C. Herne, Jay P. Nair,Alistair R. Evans ; Alan M. Tait Journal of Paleontology (2019) 93 (3): 543–584. NB:5,7 MB NB extra: this links to the page,but,hey...
  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. doushantuo

    (cello riff) large SPINOSAURUS

    bsgf_2018_189_4-6_170015.pdf BSGF - Earth Sciences Bulletin 2018, 189, 15 Large-sized theropod Spinosaurus: an important componentof the carnivorous dinosaur fauna in southern continents during the Cretaceous Carlos Roberto A. Candeiro, Lívia Motta Gil and Pedro Ernesto Pontes de Castro
  14. 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
  15. 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 ha
  16. What were the largest animals to survive the KT extinction?
  17. doushantuo

    Microgastropods of the USA

    p295-308GARVIE.pdf Microgastropod population changes from the early Cretaceous to the Recent in the Gulf Coastal Plain of the USA CHRISTOPHER L. GARVIE Zoosymposia(1),2008
  18. Alexander D.G

    Why are pyrite fossils small?

    Hey everyone, I've been wondering why pyrite fossils are almost always small compared to others of the same species. does it have anything to do with the way the fossil is formed or is it something else entirely? thanks in advance!
  19. Recaus,worth your time 10 Mb,or thereabouts
  20. doushantuo

    Large and reasonably old

    VERY HIGHLY ,nay,UNRESERVEDLY recommended,3,2 Mb This is for all those who are interestested (almost said "this is dedicated to all those interested" in the earliest history of (multicellular) animals!!!!!!!!!! in Earths earliest biota... myanknollszieparamNaturellular_eukaryotes_from_the_.pdf Give it a go, because Zhu and Knoll do know their paleobiology. I would NOT be far wrong in saying that now that Martin Brasier is no longer with us, Knoll is one of the biggest names in "early earth/astrobiology".
  21. Mahnmut

    Desmostylian Size

    Hello together. I just started to take a look at Desmostylia, as they still miss in my marine tetrapod collection (of more or less selfmade models) I read in several derivative descriptions that the biggest species (without a name being mentioned) where similar in size to stellers seacow, i.e. 7-9 meters. I believe that goes back to an article by Nicholas D. Pyenson and Geerat J. Vermeij where marine top feeders are compared by skull size. As Stellers seacow has an exceptionally small head for its size I wonder if that comparison makes sense? I´d appreciate any
  22. Hipockets

    Turtle Shell Thickness

    I was wondering , if the thickness of fossil turtle shell is relative to the size of the turtle, is there a generic formula for estimating how large the turtle would be based on shell thickness of a fragment ?
  23. doushantuo


  24. doushantuo

    Spongebob Rex

    I posted once before on cladorhizids. A single image this time. Note scale and to show the difference between a dredged and an in-place Chondrocladia
  25. doushantuo

    abelisaruid size

    I made a trip to the near future... edit:and Yes,i realize my horrendous spelling mistake CR95667116301902-main.pdf
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