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Showing results for tags 'tithonian'.
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From the album: Vertebrates
Propterus elongatus Wagner, 1863 Upper Jurassic Tithonian (Malm zeta) Eichstätt Germany Length 21 cm / 8 inch -
From the album: Invertebrates
Glyphea pseudoscyllarus Schlotheim, 1822 Upper Jurassic Tithonian (Malm zeta) Solnhofen Germany Length 6 cm / 2 inch -
Hi all! Those who follow my reports know I was planning another trip to Ulyanovsk in spring. Well, here is the report, in continuation of 1, 2 and 3. This time I was on the shore for 3 days. In short, the weather was fine, the ice abundant, the competition high and the finds scarce. The trip felt more like an extravagant outing than a productive fossil hunt
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Von Mayer originally described this chimaera under the name Ischyodus avitus. Elasmodectes avitus, a cartilaginous fish, is conspicuous for its sparsely ossified skeleton. There is a nuchal spine behind the head; the dorsal fin begins just behind the nuchal spine and extends to the tail. Elasmodectes seems to have possessed a skin or only very thin scales, which seems to be almost impossible to preserve. The Skull is presenting its dosal view. Reverence: WOODWARD, A.S. (1891) Catalogue of the fossil fishes in the British Museum (Natural History). Part II. containing the Elasmobranchii (Acanthodii). Holocephali, Ichthyodorulites, Ostracodermi, Dipnoi, and Teleostomi (Crossopterygii and chondrostean Actinopterygii). XLIV + 567 pp. (Taylor & Francis), London. SCHWEIZER, R. (1964) Die Elasmobranchier und Holocephalen aus den Nusplinger Plattenkalken. Palaeontographica, Abt. A, 123 (123): 58–110, 15 fig., pl. 7–12. POPOV, E.V. & DUFFIN, C. & TISCHLINGER, H. & ATUCHIN, A. (2013) Reconstructions of the German Plattenkalk (Late Jurassic) chimaeroid fishes (Holocephali, Chimaeroidei). Abstract. In: SCHWARZ, C. & KRIWET, J. (editors): 6th International Meeting on Mesozoic Fishes – Diversification and Diversity Patterns, Vienna, Austria August 4th–10th, 2013: 56 E. Popov (2014): A revision of the Late Mesozoic chimaeroid genus Elasmodectes (Holocephali, Chimaeroidei) [Poster] Conference: 74th Annual Meeting, Society of Vertebrate Paleontology, November 5-8, 2014, Berlin, Germany At: Estrel Berlin, Germany
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- chimaera
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One of the common coniferous plant fossils found at the Talbragar site is Agathis jurassica. The genus Agathis is extant, representing a small group of some 21 species mainly distributed in Australasia, belonging to the same family (Araucariaceae) as Wollemia. Together with a fishtail. Key references: White. M.E., 1981a. Fish beds reveal lush fossil forest. Australian Natural History 20 (7), 227-230. White. M.E., 1981b. Revision of the Talbragar Fish Bed Flora (Jurassic) of New South Wales. Records of the Australian Museum 33 (15), 695-721. Woodward, A.S., David, T.W.E. and Pittman, E.F., 1895. The fossil fishes of the Talbragar Beds (Jurassic?), with a note on their stratigraphical relations. Memoir Geological Survey of New South Wales, Palaeontology 9, 1-27. Frese M, Gloy G, Oberprieler RG, Gore DB (2017) Imaging of Jurassic fossils from the Talbragar Fish Bed using fluorescence, photoluminescence, and elemental and mineralogical mapping. PLoS ONE 12(6): e0179029. https://doi.org/10.1371/journal. pone.0179029
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From the album: Vertebrates
Macrosemimimus fegerti SCHROEDER et al., 2012 Upper Jurassic Lower Tithonian Ettling Germany Length 20cm / 8" Picture under UV light -
From the album: Vertebrates
Fish non det. Upper Jurassic Tithonian Hienheim Germany Length 2cm / .8" -
Hi all! I was finally able to visit the Volga site thanks to a water level/ good weather window. The journey was mostly a success, I got a better understanding of the site, used new means of transportation and examined more of the shoreline. Among the finds were two dozens of marine reptile verts and bone fragments and LOTS of ammonites and other mollusks. Unfortunately the river level was not low enough, 1m higher than during my 1st trip, 0,5m lower than in the 2nd. But it was at least possible to walk the shore. There's still a lot more to do, but now I have a pretty clear idea how to maximize the hunt results for the next trip. The report will be picture-heavy and divided into several blocks I'll be adding in the next few days. Let's start with the scenery.
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- ammonite
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Russian ichthyosaur (Undorosaurus) partial jaw and associated teeth
bthemoose posted a topic in Is It Real? How to Recognize Fossil Fabrications
Hi, I'm considering this partial ichthyosaur jaw with 5 teeth (3 in a natural position and 2 others that have been displaced--one is on top and one is on the backside) from Jurassic (Tithonian) deposits in Tartarstan, Russia. The seller, who is also the finder/preparer, has identified this as Undorosaurus and noted that there is repair to the last tooth at the end, which broke and has been glued back together, and some holes that he filled in on that tooth--these are shown in the second photo with the red line (repaired break) and circles (filled in holes), as drawn by seller--but no other restorations or repair. The size of the piece is 6 x 5.5 x 1.8 cm, and the teeth (including root) are 3.5 to 4 cm long. Does this look to be as it's described above, including the genus ID? Any red flags or other things I should know or ask? Thank you!
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From the album: Vertebrates
Caturidae non det. Upper Jurassic Tithonian (Malm zeta) Solnhofen Germany Length 33cm / 13" -
Three species of Thylacocephala have been described from the Solnhofen Formation (“Solnhofen lithographic limestones”) so far: Clausocaris lithographica, Dollocaris michelorum, and Mayrocaris bucculata. A fourth new genus and species was newly described in 2019: Falcatacaris bastelbergeri. References: Braig, Florian, Haug, Joachim T., Schädel, Mario, and Haug, Carolin (2019): A new thylacocephalan crustacean from the Upper Jurassic lithographic limestones of southern Germany and the diversity of Thylacocephala. Palaeodiversity, 12(1) : 69-87
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Hi, what do you think of this tooth? It's of round section (at the base), has carinae, rooted probably. Possible ID: Eutrichiurides, Lepisosteus or maybe something like croc? Middle Tithonian, Jurassic, Moscow, Russia (marine environment). 7 mm length. Provenance is not crucial, IMHO, if you have something similar, for example, from Dorset, please let me know. "frontal" view round base "side view", carinae a "head" is visible here, it was probably the part that stuck out of the jaw view from above, sorry for blurriness
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Hi all! Following the first topic I'll show you another fossil layer in that same location, Epivirgatites nikitini ammonite zone. It's the lowest of the three layers in Fili Park, relates to the middle Tithonian (Volgian, upper Jurassic) and is known for big ammonites and vertebrate remains. It's the last remaining accessible site in the region where you can count on finding Jurassic vertebrates. The finds are stable, but small, scarce and involve sifting.
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The genus Gyrodus is a characteristic faunal element of Late Jurassic marine environments and includes the largest known pycnodont (G. circularis, Upper Jurassic of southern Germany). Most pycnodonts are small to medium sized fishes with a standard body length of some 25 cm or less. Only a few large forms with a standard body length of more than 50 cm are known. Gyrodus circularis is the largest pycnodont with a standard body length up to 200 cm (KRIWET & SCHMITZ 2005). References: L. Agassiz (1843) Recherches Sur Les Poissons Fossiles. Tome I (livr. 18). Imprimerie de Petitpierre, Neuchatel xxxii-188. Kriwet, J. (2005) A comprehensive study of the skull and dentition of pycnodont fishes. Zitteliana, 2005, A45, pp. 135-188. Kriwet, J. and Schmitz, L. (2005) New insight into the distribution and palaeobiology of the pycnodont fish Gyrodus. Acta Palaeontologica Polonica 50 (1): 49–56.
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The first pereiopod is strongly elongated, was used to catch prey, and was more calcified than the rest of the body. Mecochirus was probably a bottom-dwelling reef inhabitant. On the plate are also several specimens of the swimming crinoid Saccocoma tenella GOLDFUSS, 1831. Line drawing: References: C. E. Schweitzer, R. M. Feldmann, A. Garassino, H. Karasawa, and G. Schweigert. 2010. Systematic list of fossil decapod crustacean species. Crustaceana Monographs 10:1-222
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- altmühltal-formation
- haardt
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Formerly known under the name Pholidophorus macrocephalus References: G. Arratia (2000) New teleostean fishes from the Jurassic of Southern Germany and the systematic problems concerning the ‘pholidophoriforms’May 2000, Paläontologische Zeitschrift 74(1):113-143. DOI10.1007/BF02987957
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Emended species diagnosis from Grande & Bemis 1998, p. 493: "Amiopsis lepidota differs from other species of the genus by the following adult characters A through D (note there is a range of overlap between some species for characters B, C, and D). (A) The opercle is wider than in other species of the genus (0.96-1.00 compared to 0.77-0.83 in †A. woodwardi, 0.91-0.92 in †A. damoni, 0.82 in †A. dolloi, and an estimated 0.80 in †A. prisca, based on our study sample). (B) There are seven to nine procurrent epaxial caudal rays (versus five or six in †A. damoni, and three in †A. dolloi; the count in †A. prisca is unknown, and the count of †A. woodwardi is within the range of †A. lepidota). (C) There are 61-65 total centra and 48-52 total vertebrae in post-juvenile stages (versus 58-61 centra and 45-48 vertebrae in †A. woodwardi, 59-60 centra and 47 vertebrae in †A. damoni, 56-57 centra and 46 vertebrae in †A. dolloi, and 70-74 centra and 55-56 vertebrae in †A. prisca). (D) There are 17-19 dorsal proximal radials (versus 14-16 in †A. woodwardi, and 15-17 in †A. dolloi; †A. damoni and †A. prisca are within the range of †A. lepidota). Line drawing from Grande & Bemis 1998, p. 497: Identified by oilshale using Grande & Bemis 1998. References: Grande, L. & Bemis, W. (1998) A Comprehensive Phylogenetic Study of Amiid Fishes (Amiidae) Based on Comparative Skeletal Anatomy. an Empirical Search for Interconnected Patterns of Natural History. Journal of Vertebrate Paleontology. Vol. 18, 1998, Issue Supp-001, pp. 1-696..
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Around Solnhofen at least four species of coelacanth have been recorded: Coccoderma nudum REIS 1888, Holophagus penicillata EGERTON 1861, Libys superbus ZITTEL & REIS 1888 and Macropoma willemoesii VETTER 1881 Coccoderma nudum is the smallest of these 4 species with barely more than 30cm. References: Reis, O. M. (1888) Die Coelacanthinen mit besonderer Berücksichtigung der im Weißen Jura Bayerns vorkommenden Gattungen. Palaeontographica 35, p 1-96.
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Hi everybody! Today I’ll show you yet another distinct fossil hunting location within the city limits. It’s situated in the south-east in the direct vicinity of the Moscow ring road (city and regional border). The outcrops are located on the banks of the shallow Shmelovka (Shmelyevka) river, effectively a small fordable creek.
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From the album: Cephalopods Worldwide
4cm. Calcite steinkern. Phragmocone. nodiger zone Volga Stage Tithonian (Volgian) Late Jurassic From Saratov, Volga Region, Russia-
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...Down to Gorky( Brateyevsky) park... Hi all! It is time to introduce you to the famous Panderi zone of the Moscow fossils. It is named after Dorsoplanites panderi ammonite (middle Volgian/Tithonian, Upper Jurassic), which in turn got its name from Heinz Christian Pander. It consists of numerous cast iron-like (black, heavy, solid but fragile) separate concretions containing mostly ammonites and bivalves. The fossils from the Panderi layer are grim, black, rough and depressive (in line with this winter).The zone is present throughout Moscow but becomes most accessible in the south-east. There are at least 5 spots along the river where you can collect them.
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Hi all! What do you think of this vertebra? It was found long ago, comes probably from marine Kimmeridgian-Tithonian outcrops in the Volga basin, Russia. Doesn't look exactly like plesiosaur, but what else?
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What do you think it is? The definition I got on the local forum is "conditionally classified as Plegiocidaris" Guides/handbooks on Moscow Mezozoic (unfortunately mostly outdated) list 5 genera: Echinobrissus, Rhabdocidaris, Acrocidaris, Holectypus and Cidaris. For this and neighboring stratigraphic zones Echinobrissus and Rhabdocidaris only, mainly the latter. Both are defined by spines, sometimes isolated plates
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From the album: Invertebrates
Rhizostomites admirandus Häckel, 1866 Upper Jurassic Lower Tithonian Pfalzpaint Germany Pfalzpaint is famous for its jellyfish or Scyphozoa Diameter 17cm / 7" -
From the album: Invertebrates
Rhizostomites admirandus Häckel, 1866 Upper Jurassic Lower Tithonian Solnhofen Germany
