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Found 8 results

  1. Hello, I wanted to ask how rare are Plesiosaurus jaws on the market? I've seen hundreds of real, fake, and composite Mosasaurus jaws from Morocco, but now I've seen a nice, big and real Plesiosaurus jaw with two teeth and no evidence of plaster. How rare is it to find a good one on the market? Thanks !
  2. A new polycotylid plesiosaur has been recovered from the upper half of the upper member of the lower Maastrichtian (Late Cretaceous) Pierre Shale Formation of Wyoming: Serpentisuchops pfisterae, the snake-like crocodile face. The interesting aspect to this new discovery is that this polycotylid, contrary to most other known members of this clade (that is, all with the exception of the Turonian Thililua longicollis and Manemergus anguirostris from Morocco), has a elongated neck, convergent on those of elasmosauridae. The pertinent article can be found here: Scott Persons IV, Street and Kelley, 2022. A long-snouted and long-necked polycotylid plesiosaur from the Late Cretaceous of North America.
  3. Hi All, I'm not sure if this is the best place to do this but I am putting out a call to collectors of the Atlantic Coastal Plain for plesiosaur specimens. A project is starting to address the taxonomy and stratigraphy of this poorly known but iconic and widespread group in the eastern US. We are starting by trying to document everything that exists in various collections, including private. Any and all help would be greatly appreciated! Please spread this around to anyone you might think could add to our tally. Please PM me with any information. Happy Holidays! @non-remanié @jpevahouse @wetwilly @Trevor @njfossilhunter @Darwin Ahoy @erose @frankh8147 @bucky
  4. pachy-pleuro-whatnot-odon

    Vaches Noires: plesiosaur tooth or fish tooth after all?

    Hi all, Last summer, while out hunting at the Vaches Noires on the Normandy coast of France, we found the below tooth in the Marnes de Dives (upper Callovian) . I extracted it from its matrix in order to be able to tell with confidence whether carinae are present or not and thus whether the tooth could be metriorhynchid - which I thought, at the time, to be the only other major contender. Carinae are not present. As such, I then arrived at the conclusion that the tooth is plesiosaurian, and in absence of striations - anastomosing or other - that it probably belonged to Cryptoclidus sp.. This is the state in which it has remained since then. From left to right: Muraenosaurus leedsi, Cryptoclidus oxoniensis and Tricleidus seeleyi (Noè, Taylor and Gómez-Pérez, 2017) However, I keep occasionally bumping into Hypsocormus sp., a pachycormiform fish with a temporal range from the Callovian stage of the Middle Jurassic all the way through the Late Jurassic up to the Cretaceous - most recently today with the jaw below. And I must certainly say that I see some semblances... Specimen from the Oxford Clay at Peterborough An unidentified pachycormiform fish tooth from the Oxfordian levels of Vaches Noires (source) that I, here, suggest may, in fact, represent Hypsocormus sp.. Two specimens of Hypsocormus sp. from further up north on the French coast, in the Boulonnais, dating to the Kimmeridgian/Tithonian (source). Given sizes are 6.45mm and 13.1mm respectively. Two Hypsocormus sp. specimens from the Lower Oxford Clay, UK (specific locality unknown; source). Hypsocormus sp. from the Callovian of the Tournus-region of Saône et Loire in France (source). One thing that stands out from all the specimens that I've been able to identify online is that most have an notable acrodin cap, which clearly marks them as fish teeth. It's based on this that I've identified the below tooth from a vendor site as Hypsocormus sp. (or a pachycormiform, at least) tooth, although the seller had listed it as plesiosaur. Thus it seems that confusion surrounding this topic is not uncommon. Unfortunately, however, my specimen is lacking its very apex (though, could this fact in itself be an indication of there once having been an acrodin tip that more easily got damaged or eroded away?)... Pachycormiform tooth mislabelled as plesiosaur, from Fletton, Peterborough Size cannot be used as a distinguishing feature either, as, while my tooth's total length is 1'' or 2.54cm exactly, the enamelled part is only about 1.5cm, which seems to be close to the upper limit of what Hypsocormus sp. teeth were able to grow to, from what I've been able to find out. Ornamentation/striations then? This feature can't be used either, since not all positively identified pachycormiform teeth in my sample have these. How about an in-filled hollow root? Both have these. Though it seems that the pachycormiform teeth actually often lack the enamel-free part you'd identify as the root, with them apparently having broken off close to the enamelled crown, as is the case with most fish teeth. In fact, this was my main argument to reject my specimen being fish before. However, looking at the jaw posted above, you'll notice that the largest tooth lying next to the jaw does have an enamel-free, irregularly broken-off base as well. I thus find myself wondering what the exact features are that define these pachycormiform teeth, and how to distinguish them from reptile teeth. Anybody have any ideas on this or on the argued identification of my tooth? I'll start by tagging @PointyKnight, @RuMert, @caterpillar, @Carl and @taj, but please don't hesitate to join the discussion!
  5. RobFallen

    Plesiosaur Tooth

    From the album: Robs Fossil Collection

    A Plesiosaur tooth from Khouribga, Morocco. Features a couple of repairs. Size: 1.69 inches Age: 65-70 million years Locality: Khouribga, Morocco
  6. Anomotodon

    Plesiosaur

    From the album: Albian vertebrates of Ukraine

    Elasmosaurid (?) tooth
  7. Greetings good people of the fossil forum... I stand before you all this afternoon to let you know of an event happening at the Tate Geological Museum in Casper, Wyoming on June 4-6. Yes, it is the 26th annual Tate Conference! The theme this year is Marine Reptiles. We have speakers from all over the map (including a few virtual folks speaking form Europe), talking about mosasaurs, ichthyosaurs, plesiosaurs, sea turtles and even Tanystropheus (one of my personal favorites). Talks will be here on the Casper College campus and will be all day on Friday the 4th. As usual, we are having two days of field trips as well with the conference. Saturday we will head out to the Cretaceous Pierre Shale in eastern Wyoming for mosasaurs (and fishes) and with some luck, a plesiosaur. With a ton o f luck we turn up a sea turtles or pterosaur or bird. On Sunday we will go into the Jurassic Sundance Formation to look for ichthyosaurs (and the ever-present belemnites) and maybe an plesiosaur. Friday conference attendees get priority for spaces on the field trips. Registration and a list of speakers and talks can be found here: https://www.caspercollege.edu/tate-geological-museum/events/conference/ I would love to see a few folks form the forum show up. Casper College has done away with mask ordinances, but we will be encouraging masks and social distancing. Masks are still required for the field trips... the automotive portion.
  8. Still_human

    Missing pliosaurs?

    This started bothering me from lack of fossils for sale(and tooth prices when they are), and although this is far from anything scientific or reliable, I feel like I hear about plesiosaur fossil finds significantly more than pliosaurs finds(im not really sure how to begin searching for that kind of compiled info). Is there a reason pliosaurs seem to be so rare? As far as fossils for sale, the only thing I can think of, other than pliosaurs being just plain rare(super rare when compared to the number of plesiosaurs), is that for some reason everyone just mistakes/assumes pliosaur fossils are actually from plesiosaurs.
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