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Found 30 results

  1. Talbragar plant or animal?

    Hi All, Anyone got an idea of if this is a fossil plant or animal? Cheers R
  2. Ceratosaurus Teeth from Uruguay

    Paper describes a large theropod from Uruguay represented by isolated teeth which resemble Ceratosaurus. I dont have access to this paper but it will be interesting to see the multvariate analysis results and be able to compare these teeth to those found in Portugal. What is interesting in the highlights is that they propose that the spinosaurid Ostafrikasaurus crassiserratus from Tanzania should be referred as a ceratosaurid theropod. Paywalled: https://www.sciencedirect.com/science/article/abs/pii/S0895981120303242
  3. Paper describes a new Jurassic carcharodontosaurian taxon, Lusovenator santosi, gen. et sp. nov. based on the reevaluation of previously described specimens from the Lusitanian Basin, Portugal. No dentary material was found For those not members of SVP its paywalled, https://www.tandfonline.com/doi/full/10.1080/02724634.2020.1768106
  4. A new ichthyosaur-related paper is available online: Nikolay G Zverkov and Megan L Jacobs. 2020. Revision of Nannopterygius (Ichthyosauria: Ophthalmosauridae): reappraisal of the ‘Inaccessible’ holotype resolves a taxonomic tangle and reveals an obscure ophthalmosaurid lineage with a wide distribution. Zoological Journal of the Linnean Society zlaa028. DOI: 10.1093/zoolinnean/zlaa028 The description of Nannopterygius borealis from the Arctic circle and the synonymization of the Kimmeridgian-Tithonian genera Paraophthalmosaurus and Yasykovia with Nannopterygius offers new insights into the genus Nannopterygius, as the holotype of N. enthekiodon was mounted in a location that made it inaccessible in some respects, and Paraophthalmosaurus and Yasykovia were until recently considered probable synonyms of Ophthalmosaurus. Like Arthropterygius, Nannopterygius was widespread in waters at high latitudes. By the way, could anyone send me a copy of the above-mentioned paper?
  5. I have found this crinoid ossicle from the Morrison Formation seems to be agatized alot like the bone from the formation does anyone know of any others found from the Morrison? have looked online but cant find anything even articles talking about it.
  6. Excellent video on the Morrison formation...its part one of a three part series. Recommended to all those interested in the late Jurassic of North America.. educational, good introduction to the Morrison Fm.....opinions offered in the video might not be shared by all paleontologists, but thats typical...enjoy its good https://t.co/pzMTB7wMOc?amp=1
  7. Polish Ammonites

    Looking for assistance with the identification of these ammonites from Poland (either Niegowoniec or Odrodzieniec). Age is late Jurassic; Oxfordian. Orthosphinctes? Perisphinctes? The best that I can tell, the ribs on the big one are only bifurcate. Anyone have an idea from which formation they may have come? @Ludwigia
  8. What fossil is this?

    It was found on a beach in conglomerate rock in Wenderholm Regional park near Orewa above Auckland in New Zealand. it is 20mm long and 8mm wide
  9. New Stegosaur from Portugal

    Paper describes a largely complete specimen of Miragaia longicollum discovered in 1959 in Atouguia da Baleia, Peniche, Portugal, consisting of both anterior and posterior portions of the skeleton. https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0224263
  10. Split Shift

    I worked another split shift today, so I decided to use the 4 hours in between to visit the site in the ditch at the side of the road in the Danube valley once again. No sense in driving home and back again when your tools are anyway in the trunk. Rain had been forecast for the afternoon, but it looked ok for the time being, so off I went. It's about a 3/4 hour drive and everything was looking good until about 15 minutes before arrival when suddenly over the last hill there were dark clouds with even more darkness below them looming on the horizon. Good thing I brought my raincoat and rubber boots. To make things even more complicated, it turned out that the road to the site was blocked off only about a half a kilometer away from it, so I had to turn around , detour back up the hill and down another road to get there, which cost me about another 20 minutes. That wasn't so bad though, since it was pouring with rain at that point, so I was wondering how long I was going to hold out anyway. As it turned out to my luck, the rain pretty well let up just as I arrived, so I thanked my lucky stars and walked down the road to the new spot I'd discovered about a month ago. I remembered to take my camera this time () so here it is. I'd been here already twice, so you can probably see that I've been working at getting that layer of limestone blocks removed. That's where the fossils are sitting, or rather, lying. So I continued on for about a half an hour in the drizzle, but then the rain started getting stronger again, then it started getting serious and after another 10 minutes it was pouring down in buckets and getting rather uncomfortable. No chance to take out the camera again. At least I had managed to extricate a few ammonites, so I wrapped them up quickly and headed back to the car and thence back to a couple more hours work of another kind. These things prep up pretty quickly, so I got them done already this evening. Actually there wasn't all that much worth keeping in the end, but at least these 2 turned out ok. Taramelliceras sp. 6.5cm. Ataxioceras sp. 7cm.
  11. These finds were reported a while back and this paper describes the finds. These two partial skeletons from Montana represent the northernmost occurrences of Stegosauria within North America ever recovered from the Morrison Formation http://app.pan.pl/article/item/app005852018.html
  12. Many of us collect material from the Morrison Formation especially teeth and claws. Not much is published to help us identify these items but this new paper gives us some insight into a new Troodontid that includes teeth and claws, Hesperornithoides miessleri https://peerj.com/articles/7247/ The serrations on the mesial carinae of maxillary teeth are smaller than the distal serrations as in basal dromaeosaurids. Mesial serrations are restricted to the apical third of the crown and appear absent in some teeth. Serrations are small (5.5 per mm distally)
  13. Pliosaurus from Patagonia

    Hi, Does anyone have copies of the following papers regarding Pliosaurus: Gasparini, Z., and O'Gorman, J., 2014. A new species of Pliosaurus (Sauropterygia, Plesiosauria) from the upper Jurassic of northwestern Patagonia, Argentina. Ameghiniana; 51 (4): 269-283 O’Gorman, J., Gasparini, Z., & Spalletti, L. (2018). A new Pliosaurus species (Sauropterygia, Plesiosauria) from the Upper Jurassic of Patagonia: New insights on the Tithonian morphological disparity of mandibular symphyseal morphology. Journal of Paleontology, 1-14. doi:10.1017/jpa.2017.82 The description of Pliosaurus patagonicus and P. almanzaensis from Argentina shows that Pliosaurus must have been widespread in all seas and oceans.
  14. A new sauropod-related paper is now available online: Philip D Mannion, Paul Upchurch, Daniela Schwarz, Oliver Wings; Taxonomic affinities of the putative titanosaurs from the Late Jurassic Tendaguru Formation of Tanzania: phylogenetic and biogeographic implications for eusauropod dinosaur evolution, Zoological Journal of the Linnean Society, , zly068, https://doi.org/10.1093/zoolinnean/zly068 Giraffatitan, Tornieria, and Dicraeosaurus are the best-known sauropods from the Tendaguru Formation, but the paper by Mannion et al. (2019) provides new insights into non-diplodocoid, non-brachiosaur sauropod diversity in Tendaguru Hill by assigning the long-enigmatic sauropod Tendaguria to Turiasauria, and formally recognizing a set of tail vertebrae previously assigned to Janenschia as the first mamenchisaurid from Africa, bearing the new binomial Wamweracaudia keranjei. Given the placement of Janenschia outside Neosauropoda, and the turiasaur and mamenchisaurid classifications of Tendaguria and Wamweracaudia respectively, it is quite apparent that more than one clade of non-neosauropod sauropods existed in East Africa during the Late Jurassic.
  15. New choristodere from China

    A new paper you may find interesting: Ryoko Matsumoto, Liping , Yuan Wang & Susan E. Evans (2019). The first record of a nearly complete choristodere (Reptilia: Diapsida) from the Upper Jurassic of Hebei Province, People's Republic of China. Journal of Systematic Palaeontology (advance online publication) doi:Â https://doi.org/10.1080/14772019.2018.1494220 https://www.tandfonline.com/doi/full/10.1080/14772019.2018.1494220 Coeruleodraco is significant because it is the most complete Jurassic choristodere, considering that the exact relationships of Choristodera to other diapsids have remained contentious to this day given the dearth of early choristoderes. I know that the choristodere placement of Pachystropheus by Storrs and Gower (1993) has been questioned in recent papers due to the lack of skull remains, which preserve some diagnostic choristodere characters, and Lazarussuchus was considered the most primitive choristodere, a late-surviving basal one, until new material by Matsumoto et al. (2013) showed it to be more advanced than Cteniogenys.
  16. Fish tail?

    Hi, I went to the Tamazunchale area for Christmas break, and I bought this fossil from a local collector. He told me it was from some sort of aquatic animal. The sediments from the area are from the Pimienta, Santiago, and Taman formations. They represent Late Jurassic marine environments. Could this be a caudal fish fin (fish tail), or something else. I though it resembled part of a feather, but since they are marine sediments I doubt it.
  17. I periodically get asked about smaller theropod teeth so this is what I know. If you have additional tooth related information please pass it on since very little is known or published. Tanycolagreus topwilsoni The holotype included a fragmented skull with one premaxillary and two lateral teeth. Unfortunately the teeth were crushed with no visible serrations so its unknown how to describe them. Holotype skull Reconstruction Skull of Marshosaurus from Utah Museum of Natural History. So you can see variation of the teeth in jaw If you are interested in finding out more about Holotype skeleton this book is the best around. Carpenter, K., Miles, C., and Cloward, K. (2005). "New small theropod from the Upper Jurassic Morrison Formation of Wyoming." in Carpenter, K. 2005. The Carnivorous Dinosaurs, Indiana University Press: 23-48 Koparion douglassi Oldest known Troodontid and only known from a single maxillary tooth. Pictures says it all. A tooth taxon! Scale: A 1 mm, B-F 100 micrometers Chure, D. J. (1994). "Koparion douglassi, a new dinosaur from the Morrison Formation (Upper Jurassic) of Dinosaur National Monument; the oldest troodontid (Theropoda: Maniraptora)." Brigham Young University Geology Studies, 40: 11-15 Hesperornithoides miessleri A new Troodontid. The serrations on the mesial carinae of maxillary teeth are smaller than the distal serrations as in basal dromaeosaurids. Mesial serrations are restricted to the apical third of the crown and appear absent in some teeth. Serrations are small (5.5 per mm distally). The teeth are labiolingually compressed, and the enamel shows no trace of longitudinal grooves. Unfortunately the paper does not identify the sizes of these teeth. Distal Serration Density 5.5/mm FABL: around .45 https://peerj.com/articles/7247/ Coelurus fragilis Known from a fairly complete skeleton however there is a question if the dentary, below, belongs to the skeleton. No teeth were recovered and cannot find any additional information on teeth. Ken Carpenter recently responded to my inquiry about these teeth. He stated that we have no teeth from this dinosaur. Teeth have been called Coelurus because they are small but there is no proof of association Carpenter, K., Miles, C., and Cloward, K. (2005). "New small theropod from the Upper Jurassic Morrison Formation of Wyoming." in Carpenter, K. 2005. The Carnivorous Dinosaurs, Indiana University Press: 23-48 Ornitholestes hermanni Skull with both mandibles are part of the holotype. Osborn et. al (1917) paper just comments that the teeth are small and feeble. Carpenters book mentions that the skull is presently being studied by Mark Norell Carpenter, K., Miles, C., and Cloward, K. (2005). "New small theropod from the Upper Jurassic Morrison Formation of Wyoming." in Carpenter, K. 2005. The Carnivorous Dinosaurs, Indiana University Press: 23-48 Reconstructed Skull AMNH Osborn, Henry Fairfield (1917). "Skeletal adaptations of Ornitholestes, Struthiomimus, Tyrannosaurus". Bulletin of the American Museum of Natural History. 35 (43): 733–771. hdl:2246/1334. Allosaurus Needs to be developed, in the queue Torvosaurus Ceratosaurus Marshosaurus
  18. Torvosaurus tanneri is one of the apex theropods found in the Morrison Formation and has the largest dentition. Teeth of this and other theropods are commonly sold through online Dealers, Auction Houses and at Fossil shows. Just because a site/dealer sells Jurassic material does not guarantee accuracy. Variation of the teeth in the jaw also adds to the complexity. Isolated teeth from the Morrison Formation are very difficult to diagnose and all require an understanding of additional characteristics than normal, in hopes of properly identifying them. I have not been able to find any publication that describes the teeth of this species so it's beyond me how Sellers identify them other that they are big and look like Rex . The best I can do is to look at reference publications which include similar teeth from Portugal which describes Torvosaurus cf. gurneyi. Should be pretty close to Torvosaurus tanneri of the Morrison. Sellers need to provide you the following information: 1)Photo of tooth both sides and one of the mesial edge 2)Serration density of both edges, 5 mm wide at midline 3)Dimensions: CBL, CBW, CH 4)Locality: State and County Mesial teeth CHR : appox 2.75 Crown height ratio CH÷CBL CBR : appox .65 Crown base ratio CBW÷CBL Mesial Density: 7 to 8 per 5 mm, Distal Density: 7 to 8 per 5 mm all at midline. DSDI = 1 ( DSDI : Denticle size density index = Mesial Density ÷ Distal Density) Mesial and distal denticles decrease in size towards the base of the crown and similarly towards the crown apex. Mesial serrations occupy 55 to 65% of the crown height Distal serrations extend to below the cervex Cross-section base : sub-circular Lateral teeth CHR : 1.4 (short crowns), 2.8 (elongated crowns) Crown height ratio CH÷CBL CBR : .35 to .65 Crown base ratio CBW÷CBL Mesial Density: 6 to 9.5 per 5 mm, Distal Density: 6 to 9.5 per 5 mm all at midline. DSDI = 1 ( DSDI : Denticle size density index = Mesial Density ÷ Distal Density) Mesial serrations occupy 40 to 80% of the crown height Distal serrations extend to below the cervex Wide transverse undulations covering most of the tooth are common Isolated tooth of Torvosaurus cf. gurneyi in lingual (C1), labial (C2), mesial (C3), and distal (C4) views, with details of mesial (C5) and distal (C6) denticles, and enamel texture (C7) in lateral views. Reconstruction Skull of Torvosaurus from Utah Museum of Natural History. So you can see variation of the teeth in the jaw Reference: Hendrickx, C., Mateus, O., and Araújo, R. 2015. The dentition of megalosaurid theropods. Acta Palaeontologica Polonica 60 (3): 627–642.
  19. Gravesia gigas ( Zieten 1830)

    From the album Late Jurassic Ammonites from Southern Germany

    16cm. Late Jurassic, Tithonian, hybonotum zone. From a quarry in Emmingen-Liptingen.
  20. Archaeopteryx Could Fly

    I assumed that it was already confirmed that Archaeopteryx could fly but apparently this debate is just now coming to a close. It took awhile. Article 1: https://news.nationalgeographic.com/2018/03/archaeopteryx-flight-dinosaurs-birds-paleontology-science/ Article 2: https://gizmodo.com/new-evidence-suggests-archaeopteryx-could-fly-we-just-d-1823727562 The open access paper: https://www.nature.com/articles/s41467-018-03296-8
  21. A new article from Geology of the Intermountain West: A preliminary report of the fossil mammals from a new microvertebrate locality in the Upper Jurassic Morrison Formation, Grand County, Utah Article https://www.utahgeology.org/openjournal/index.php/GIW/article/view/25 PDF https://www.utahgeology.org/openjournal/index.php/GIW/article/view/25/47
  22. These camarasaurus metacarpals were discovered within a 20' area of the digsite. A number of other camarasaurus bones were found in the same area. They all came from a smaller, sub-adult camarasaurus. I'm trying to figure out if they all come from the same foot. (left, front foot) I have only two, or three worn out toe bones, and the big claw was missing. High energy water ripped this dinosaur apart. Parts of a diplodocus were scattered around the same area.