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Found 16 results

  1. Mini Mosasaur collection

    From the album Marine reptiles and mammals

    A little collection of assorted mosasaur fossils from 2 different places that I got when I first started collecting. 2 different types of vertebrae, one is mosasaur, and the other is a questionable claim of mosasaur, a corprolite that was claimed to be that of a mosasaur, a tooth, & 7 rib fragments. 2 ribs have predation marks, as well as the large vertebra. The large vert has a round tooth indent on the very center. The 2nd rib down has tooth scratches along the surfaces, & 3rd rib down has a round tooth indent in the center, which is probably what caused a strip across the middle to break off. There are 2 other tooth marks on that rib as well, forming a diagonal line from above left of the center indent, breaking off a piece along the top, to below right.
  2. Edaphosaurus with large predator bite

    From the album Permian era fossils

    Yet unidentified Edaphosaurus pogonias bone from the Permian era Red Beds site in North Texas, with large unhealed tooth hole from what appears to be a large Dimetrodon's bite, from either the fatal attack, or post-death predation mark.
  3. Tyrannosaurus fibula?

    So, can anyone shatter my dreams with THIS one? Lol no, I'm really extremely appreciative of the help Ive been getting with questionable fossils, and the chance to learn important and helpful information! the description says it all...this is supposed to be a tyrannosaurus fibula fragment. Seems legit to me, but I could definitely use other opinions. This is a hell creeker.
  4. Hi all, So this little bone piece was found at the beach of Wassenaar, Netherlands; it’s from the late Pleistocene, 40’000 years old. I got two questions on this one: Is it possible to say anything more about this bone fragment (eg what animal/what part of the skeleton)? In the last picture, are those predation marks? I can take better pictures if needed. Thanks in advance for your help! Max
  5. This has been bugging me for some time now, and I can't find any papers that answer these questions. I'm honestly surprised at how little research seems to have been done about these topics. 1. How fast were they compared to some modern-day benthic animals? Were they slow and cumbersome, or were they fast and agile? How did this change through time/environment? I assume that the earlier, Cambro-Ordovician trilobites would have been a fair bit slower than their later counterparts due to a lack of nektic predators that could easily pierce their armor, but this is just my assumption. 2. Did fish actually actively predate on them in any significant capacity? I often see it said that the rise of fish throughout the middle Paleozoic is a reason for the Trilobite's demise, due to increased predation, but I've never actually seen any significant evidence for this. I find it hard to imagine how Palaeozoic fish could have effectively preyed on them - their morphology just doesn't seem to have been suited to "breaking their defenses", so to speak. Even modern day fish seem to rarely actively hunt animals like crabs, which are somewhat analogous to the trilobites in terms of morphology and ecology. 3. Was their post-Devonian terminal decline due to environmental elimination (mainly, the destruction of the Tabulate-Stromatoporoid reefs which they seem to have inhabited in significant numbers), or due to something else?
  6. perimeter defense,molluscan style?

    Posting this because the results of predation can impact (the interpretation of) bivalve taphonomy. Besides,I think documentation like this is rare. Love to be proven wrong,BTW feifdoc_spinepibiontsantipredathorn-spondys.pdf outtake:
  7. Mosasaur Bites Ammonite

    The Mark of the Mosasaur: A 90-million-year-old bite mark raises questions about what seagoing lizards really ate By Brian Switek on April 27, 2017 https://blogs.scientificamerican.com/laelaps/the-mark-of-the-mosasaur/ Gale, A., Kennedy, W., Martill, D. 2017. Mosasauroid predation on an ammonite – Pseudaspidoceras – from the Early Turonian of south-eastern Morocco. Acta Geologica Polonica. doi: 10.1515/agp-2017-0003 https://geojournals.pgi.gov.pl/agp/article/view/25689 Some other papers: Kauffman, E.G. and Kesling, R.V., 1960. An Upper Cretaceous ammonite bitten by a mosasaur. Contrib.Mus. Paleontol.Univ. Mich. 15:193-248 https://deepblue.lib.umich.edu/bitstream/handle/2027.42/48337/ID178.pdf;sequence=2 Kase, T., Johnston, P.A., Seilacher, A. and Boyce, J.B., 1998. Alleged mosasaur bite marks on Late Cretaceous ammonites are limpet (patellogastropod) home scars. Geology, 26(10), pp.947-950. http://geology.gsapubs.org/content/26/10/947.short Tsujita, C.J. and Westermann, G.E., 2001. Were limpets or mosasaurs responsible for the perforations in the ammonite Placenticeras?. Palaeogeography, Palaeoclimatology, Palaeoecology, 169(3), pp.245-270. http://www.sciencedirect.com/science/article/pii/S0031018201002206 Klompmaker, A.A., Waljaard, N.A. and Fraaije, R.H., 2009. Ventral bite marks in Mesozoic ammonoids. Palaeogeography, Palaeoclimatology, Palaeoecology, 280(1), pp.245-257. http://www.sciencedirect.com/science/article/pii/S0031018209002296 https://www.researchgate.net/profile/Adiel_Klompmaker/publication/229134933_Ventral_bite_marks_in_Mesozoic_ammonoids/links/0deec51cff63b6dcba000000.pdf Hewitt, R.A. and Westermann, G.E.G., 1990. Mosasaur tooth marks on the ammonite Placenticeras from the Upper Cretaceous of Alberta, Canada. Canadian Journal of Earth Sciences, 27(3), pp.469-472. http://www.nrcresearchpress.com/doi/abs/10.1139/e90-042#.WRPHjlKZMk5 Yours, Paul H.
  8. I'm looking for some information on predation of Stylemys, I can't seem to find any information on it, other than "tortoises are often found with damage from alligators" Thanks in advance
  9. Spinosaurus

    From the album Nigel's album

    Two predation marks evident on face of tooth
  10. Triceratops frill

    From the album Nigel's album

    Supposed to have predation marks on the rear of the frill?
  11. worm takeaway

    Some of you may have heard of Boucot's compendium of fossil behaviour. This could/should be in there,if it isn't already ulrichfausectB50H12S5.PDF
  12. Madagascar ammonite crushing?

    Can someone tell me about the crushing that is seen in the walls of this ammonites chambers? Its odd to me that in the areas where the entire wall is gone, the geode/vug areas still occur as you would expect them to with chambers? I picked this up for $10 after noticing the crushing, because I don't have any like that in my collection
  13. Just something for the group, I was just wondering if any one else would like to see a category dedicated to Trace Fossils? I like looking up info and seeing pictures on different Trace Fossils and find myself opening various topics and really finding what I am looking for. I think it could be something as simple as adding it to the "Collections" section with a category titled "Trace Fossils", and that could include sub-categories for trackways, coprolites, burrows, predation evidence, ripple marks / rain drops, trails, etc., or just lump it all under Trace Fossils. If not in the Collections area, it could be placed in the General Fossil Discussion area with a sub-category similar to Micro- Paleontology. Thanks
  14. From the album Anomalocaris and friends.

    Close up of the trilobite stuck on the end of the Amplectobelua symbrachiata feeding appendage. From Chengjiang.
  15. From the album Anomalocaris and friends.

    My best fossil. The Anomalocaridid, Amplectobelua symbrachiata feeding appendage with a trilobite curiously attached to the end. Amplectobelua predation on trilobites or trilobite predation on a dead Amplectobelua? From Chengjiang.
  16. Predated Asaphiscus?

    Hi All I was hunting in Wheeler Shale a week ago... When I split open this. Looks like as if the Asaphiscus had been predated on. Could I be right? Wondering what others think. Thanks, SP
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